WO2004086776A2 - Co-channel wireless communication methods and systems using nonsymmetrical alphabets - Google Patents
Co-channel wireless communication methods and systems using nonsymmetrical alphabets Download PDFInfo
- Publication number
- WO2004086776A2 WO2004086776A2 PCT/US2004/008880 US2004008880W WO2004086776A2 WO 2004086776 A2 WO2004086776 A2 WO 2004086776A2 US 2004008880 W US2004008880 W US 2004008880W WO 2004086776 A2 WO2004086776 A2 WO 2004086776A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- wireless communications
- radioterminals
- alphabet
- return link
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/18—Service support devices; Network management devices
- H04W88/184—Messaging devices, e.g. message centre
Definitions
- This invention relates to wireless communications methods and systems, and more particularly to wireless communication systems and methods that can communicate co-channel.
- Polarization diversity receiving systems and methods are well known in wireless communications.
- a wireless terminal may transmit a linearly- polarized signal that may be received by orthogonally polarized antennas (e.g., horizontal and vertical polarization) at a base station (terrestrial or space-based) to thereby separately receive orthogonally polarized portions of the transmitted signal.
- the orthogonally polarized portions may be combined to effectively increase link robustness, since many channel degradations such as fading, are largely uncorrelated when comparing antennas of orthogonal polarizations. See for example, U.S. Patent 6,526,278 to Hanson et al. entitled Mobile Satellite Communication System Utilizing Polarization Diversity Combining; U.S.
- Patent 5,724,666 to Dent entitled Polarization Diversity Phased Array Cellular Base Station and Associated Methods
- U.S. Patent 6,418,316 to Hildebrand et al. entitled Increasing Channel Capacity of Wireless Local Loop via Polarization Diversity Antenna Distribution Scheme
- U.S. Patent 6,445,926 to Boch et al. entitled Use of Sectorized Polarization Diversity as a Means of Increasing Capacity in Cellular Wireless Systems.
- Some embodiments of the present invention transmit wireless communications from at least two radioterminals to a base station co-channel over a return link using a return link alphabet, and transmit wireless communications from the base station to the at least two radioterminals over a forward link using a forward link alphabet that has more symbols than the return link alphabet.
- the term "co- channel” indicates signals that overlap in time and space, and that use the same carrier frequency, the same time slot if the signals are Time Division Multiple Access (TDMA) signals, and the same spreading code if the signals are Code Division Multiple Access (CDMA) signals, such that the two signals collide at a receiver.
- TDMA Time Division Multiple Access
- CDMA Code Division Multiple Access
- Embodiments of the present invention can allow the co-channel signals to be decoded or deciphered at the receiver, and can allow the radioterminals to use a smaller return link alphabet which can reduce the power dissipation at the radioterminals.
- the wireless communications are transmitted from the base station to the radioterminals non-co-channel over the forward link using the forward link alphabet that has more symbols than the return link alphabet.
- co-channel transmissions may be used.
- wireless communications are transmitted from the at least two radioterminals to at least one antenna at the base station co-channel over a return link using a return link alphabet.
- these transmissions are made to at least one multiple-polarized antenna at the base station.
- these transmissions are made to a plurality of multiple-polarized antennas at the base station.
- these transmissions are made to a plurality of multiple-polarized antennas in a single sector of the base station.
- the wireless communications are transmitted to the plurality of multiple-polarized antennas in a sector if the at least two radioterminals are separated by more than a predetermined distance. In other embodiments, these transmissions are made to at least one multiple-polarized antenna in at least two sectors of the base station. In yet other embodiments, these transmissions are made to at least one multiple-polarized antenna at a first base station and at least one multiple-polarized antenna at a second base station. In still other embodiments, these transmissions are made from a single linearly-polarized antenna at each of the at least two radioterminals.
- inventions of the present invention transmit wireless communications from at least two radioterminals to a base station over a return link using a return alphabet and transmit wireless communications from the base station to the at least two radioterminals co-channel over a forward link using a forward link alphabet that has more symbols than the return link alphabet.
- the transmission from the radioterminals to the base station may be non-co-channel or co-channel.
- the wireless communications may be transmitted from the base station to at least one antenna at each of the at least two radioterminals, to at least one multiple-polarized antenna at each of the at least two radioterminals and/or to a plurality of multiple-polarized antennas at each of the at least two radioterminals, co-channel over a forward link using a forward link alphabet that has more symbols than the return link alphabet, as was described above.
- Transmission from the base station may use at least one antenna, at least one linearly- polarized antenna, at least two linearly-polarized antennas, at least two linearly- polarized antennas in a sector, at least one linearly-polarized antenna in at least two sectors and/or at least one linearly-polarized antenna at two or more base stations, as was described above.
- wireless communications are received from a base station at a first radioterminal and at least one second radioterminal that is proximate the first radioterminal over a forward link, co-channel.
- the wireless communications are relayed from the at least one second radioterminal to the first radiotenninal over a short-range wireless link.
- the wireless communications that are relayed to the first radioterminal from the at least one second radioterminal over the short-range wireless link are used to process the wireless communications that are received from the base station at the first radioterminal.
- these embodiments may be combined with any of the embodiments that were described above.
- Still other embodiments of the present invention bidirectionally transmit wireless communications co-channel in time division duplex from at least two radioterminals to a base station over a return link using a return link alphabet, and from the base station to the at least two radioterminals over a forward link using a forward link alphabet that has more symbols than the return link alphabet.
- Figures 1-3 and 4A-4B are diagrams of co-channel wireless communications according to various embodiments of the present invention.
- Figure 5 A is a diagram of radioterminal to base station communications according to embodiments of the present invention.
- Figure 5B is a diagram of base station to radioterminal communications according to embodiments of the present invention.
- Figure 5C is a diagram of base station to radioterminal communications according to other embodiments of the present invention.
- Figures 6A-6B are block diagrams of receivers that may be used in Figures
- Figure 7 graphically illustrates simulated receiver performance for signals in Rayleigh fading channels according to some embodiments of the present invention.
- Figure 8 is a diagram of base station to radioterminal bidirectional communications according to embodiments of the present invention.
- Figure 9 is a block diagram of a receiver and transmitter that may be used in embodiments of Figure 8.
- Figure 10 is a block diagram of a receiver that may be used in Figure 9 according to embodiments of the present invention.
- Figure 11 is a block diagram of a transmitter that may be used in Figure 9 according to embodiments of the present invention.
- Figures 12 and 13 are diagrams of radioterminals and base stations, respectively, according to embodiments of the present invention.
- Some embodiments of the present invention may arise from a recognition that it is possible to configure two physically distinct radioterminals to transmit to a base station, also referred to as a base transceiver station (BTS), co-channel, using the same return-link radio-channel resource(s) while still being able, at the BTS, to reliably demodulate and reconstruct (i.e., decode) the two data streams of the two physically distinct radioterminals. It is also possible to configure a BTS to transmit to two physically distinct radioterminals co-channel, over the same forward-link radio- channel resource(s), while each of the two distinct radioterminals is able to reliably demodulate and reconstruct the information intended for it.
- a base station also referred to as a base transceiver station (BTS), co-channel
- BTS base transceiver station
- the two physically distinct radioterminals may thus communicate bi-directionally with a BTS, co- channel, in some embodiments, using no more channel resource(s) than a single radioterminal would use.
- the signal processing techniques that make this possible can exploit the multipath scattering nature of the radiochannel and/or the multi-dimensional nature of space and its relationship to electro-magnetic wave propagation.
- embodiments of the invention can be extended to allow three or more physically distinct radioterminals to communicate co-channel with a BTS without using any more radiochannel resource(s) than a single radioterminal would.
- Some embodiments of the present invention may also arise from a recognition that co-channel communications may be more beneficial for an infrastructure (base station) receiver than for a radioterminal receiver, because an infrastructure transmitter may not be power limited and may thus resort to a higher-alphabet modulation format (i.e. 8-PSK, 16-QAM, 64-QAM, etc.) to increase channel capacity on a forward link.
- a radioterminal' s transmitter may be power limited and may thus be constrained to lower-alphabet modulation formats (i.e. QPSK, GMSK, etc.).
- the ability of two or more radioterminals to send information to an infrastructure element (base station) co-channel may be used advantageously to increase channel capacity on the return link(s).
- base stations and radioterminals may be configured to utilize different modulation alphabets on forward and return links with a return link alphabet having a smaller number of distinct states (symbols) than a forward link alphabet, and with at least some infrastructure (base station) receivers of the system configured for co- channel communications, as will be described in further detail below.
- FIG. 1 is a diagram of co-channel wireless communications using nonsymmetrical alphabets according to some embodiments of the present invention.
- wireless communications are transmitted from at least two radioterminals 110a and 110b to a base station (BTS) 120 co-channel over a return link 130 using a return link alphabet having return link symbols S R .
- BTS base station
- wireless communications are transmitted from the base station 120 to the at least two radioterminals 110a and 110b over a forward link 140 using a forward link alphabet having forward link symbols S F , wherein the forward link alphabet has more symbols than the return link alphabet.
- S F > SR.
- the wireless communications are transmitted from the base station 120 to the at least two radioterminals 110a and 110b non-co-channel over the forward link 140 using the forward link alphabet that has more symbols S F than the return link alphabet S R .
- the wireless communications are transmitted from the at least two radioterminals 110a and 110b to at least one antenna 122 at the base station 120 co-channel over the return link 130 using the return link alphabet.
- the at least one antenna 122 is at least one multiple-polarized antenna. In other embodiments, the at least one antenna 122 is a plurality of multiple- polarized antennas.
- the base station 120 includes a plurality of sectors using sectorization techniques that are well known to those having skill in the art.
- the at least one antenna 122 comprises a plurality of multiple- polarized antennas in a single sector of the base station, such that wireless communications are transmitted from the at least two radioterminals 110a and 110b to the plurality of multiple-polarized antennas in the single sector of the base station 120 co-channel over the return link 130 using the return link alphabet.
- the wireless communications from the at least two radioterminals 110a and 110b are transmitted to a plurality of multiple-polarized antennas 122 in the sector of the base station 120 co-channel over the return link 130 using the return link alphabet if the at least two radioterminals are separated by more than a predetermined distance D.
- the wireless communications are transmitted from the at least two radioterminals 110a and 110b to at least one multiple-polarized antenna 122 in at least two sectors of the base station 120 co-channel over a return link using the return link alphabet.
- FIG. 2 is a diagram of co-channel wireless communications using nonsymmetrical alphabets according to other embodiments of the present invention.
- the base station 120 is a first base station.
- Wireless communications are transmitted from at least two radioterminals 110a and 110b to at least one multiple-polarized antenna 122 at the first base station and at least one multiple-polarized antenna 222 at a second base station 220 co-channel over a return link 130 using a return link alphabet.
- wireless communications may be transmitted from a single linearly-polarized antenna 112a, 112b at each of the at least two radioterminals 110a, 110b to the base station 120, 220 co-channel over the return link 130 using the return link alphabet.
- Figures 1 and 2 allow co-channel transmissions from radioterminals to a base station using a small element alphabet in conjunction with non-co-channel transmissions from the base station to the radioterminals using a larger element alphabet.
- the number of antenna elements at the base station may be operative within a given sector of a base station, distributed over more than one sector of a base station and/or distributed over a plurality of base stations.
- intra-sector co-channel return link communications may be provided, as well as inter-sector and inter-base station return link co-channel communications, to provide potentially improved capacity characteristics.
- intra-sector co-channel communications between two or more radioterminals and a base station may only be allowed in response to a distance D between the radioterminals. Since the system can know the position of the radioterminals, based on, for example, GPS or other techniques, radioterminals that are, for example, D meters or more apart may be allocated co-channel resources. Otherwise, non-co-channel resources may be allocated. The distance D may be selected so as to provide sufficient multipath differentiation from the signals that originate from the two radioterminals that are transmitting co-channel.
- Figure 3 is a diagram of co-channel wireless communications using nonsymmetrical alphabets according to still other embodiments of the present invention.
- wireless communications are transmitted from at least two radioterminals 310a, 310b to a base station 320 over a return link 330 using a return link alphabet having return link symbols SR.
- Wireless communications are also transmitted from the base station 320 to the at least two radioterminals 310a, 310b co-channel over a forward link 340 using a forward link alphabet having forward link symbols S F , wherein the forward link alphabet has more symbols than the return link alphabet.
- S F > S R .
- Embodiments of Figure 3 may be employed where it is desirable to relay much more data to the radioterminals 310a, 310b from the base station 320 than to the base station 320 from the radioterminals 310a, 310b. This may be the case when the radioterminals may be receiving large files from the base station, whereas the radioterminals are only sending back mouse clicks and/or other small amounts of data.
- Embodiments of Figure 3 use a larger element alphabet in conjunction with co- channel communications to serve two or more terminals, while the radioterminals use a smaller element alphabet and may communicate non-co-channel with the system.
- wireless communications are transmitted from the at least two radioterminals 310a, 310b to the base station 320 co-channel over the return link 330 using the return link alphabet.
- the wireless communications are transmitted from the base station 320 to at least one antenna 312a 3 312b at each of the at least two radioterminals co-channel over the forward link using the forward link alphabet that has more symbols than the return link alphabet.
- the at least one antenna 312a, 312b comprises at least one multiple-polarized antenna. In other embodiments, the at least one antenna 312a, 312b comprises a plurality of multiple-polarized antennas.
- the at least one antenna 322 at the base station 320 comprises at least one linearly-polarized antenna, at least two linearly-polarized antennas, at least two linearly-polarized antennas in a single sector and/or a linearly-polarized antenna in at least two sectors, as was described above in connection with the antennas 122 of Figure 1.
- transmissions may occur to at least one linearly-polarized antenna at a first base station and at a second base station, as was described above in connection with Figure 2.
- Figure 4A is a diagram of co-channel wireless communications according to yet other embodiments of the present invention.
- wireless communications are received from a base station 420 at a first radioterminal 410a and at at least one second radioterminal 410b that is proximate the first radioterminal 410a, over a forward link 440, co-channel.
- the wireless communications from the at least one second radioterminal 410b are relayed to the first radioterminal 410a over a short-range wireless link 450.
- the short-range wireless link may be based on Bluetooth and/or other technologies such as 802.11, UWB, etc.
- the first radioterminal 410a uses the wireless communications that are relayed to the first radioterminal 410a from the at least one second radioterminal 410b over the short- range wireless link 450, to process the wireless communications that are received from a base station 420 at the first radioterminal 410a over the forward link 440.
- the signals from one or more proximate radioterminals may be used to improve a quality measure such as a bit error rate, of the information that is being received from the base station 420. It will also be understood by those having skill in the art that embodiments of Figure 4 need not use a forward link alphabet that has more symbols than a return link alphabet.
- embodiments of Figure 4 may be used with any of the embodiments of Figures 1-3, including the use of a forward link alphabet that has more symbols than a return link alphabet, co-channel communications from the radioterminals 410a, 410b to the base station 420, and antenna configurations for the base station 422 and for the radioterminal antennas 412a, 412b similar to those described in connection with Figures 1-3.
- FIG. 4B is a diagram of co-channel wireless communications using nonsymmetrical alphabets according to still other embodiments of the present invention.
- wireless communications are bi-directionally transmitted co-channel in Time Division Duplex (TDD) 450.
- Time division duplex transmission is well known to those having skill in the art, and need not be described further herein.
- bidirectional transmission co-channel in time division duplex proceeds from at least two radioterminals 460a, 460b to a base station 470 over a return link using a return link alphabet, and from the base station 470 to the at least two radioterminals 460a, 460b over a forward link using a forward link alphabet that has more symbols than the return link alphabet.
- the antennas 462a, 462b of the first and second radioterminals 460a, 460b may be configured as was described in Figures 1-4 A above.
- the antenna or antennas 472 of the base station 470 may be embodied as was described above in any of Figures 1-4 A.
- the receiver of a radioterminal and the receiver of a BTS may be configured to operate on a plurality of signals that may be acquired via a plurality of spatially-separated and/or co-located antennas.
- the transmitter of a radioterminal may use a single antenna.
- the BTS may transmit the information that is intended for a first radioterminal from a first antenna and the information that is intended for a second radioterminal from a second antenna that may be spatially-separated from the first.
- the two radioterminals may use the same return-link channel resource(s) to transmit information to the BTS.
- the BTS may use the same forward-link channel resource(s) to transmit information to the two radioterminals.
- Figures 5A and 5B illustrate antenna configurations of non-TDD embodiments. It will also be understood that some embodiments of Figures 5A and 5B may be used in TDD mode as well.
- the M dual-polarized (or cross polarized) receiver antennas 512 of a radioterminal 510 may be replaced by M triple (x, y, z) -polarized, linearly-polarized, circularly- polarized and/or other type of receiver antennas.
- M triple (x, y, z) -polarized, linearly-polarized, circularly- polarized and/or other type of receiver antennas may be replaced with triple-polarized, linearly-polarized, circularly- polarized, and/or other type of antennas, and that the value of M may be different for different radioterminals.
- only one receiver antenna that has been tapped at different points may be used on a radioterminal to provide a plurality of signal inputs to the radioterminal 's receiver.
- the N dual-polarized receiver antennas 540 of a BTS may be replaced in part or in entirety by triple (x, y, z) - , polarized, linearly-polarized, circularly-polarized, and/or other type of receiver antennas.
- linearly-polarized transmitter antennas 520 of a BTS may be replaced by a dual- or multi-dimensionally-polarized, circularly-polarized and/or other type of transmitter antenna(s) and that the linearly-polarized transmitter antenna 532 of a radioterminal 530 may be replaced by a dual-polarized, multi- dimensionally-polarized, circularly-polarized and/or other type of transmitter antenna.
- FIG. 5A in environments of dense radioterminal communications, such as in airports, convention centers, shopping malls, etc., one or more radioterminals 550b-550n that is/are proximate to a first co-channel radioterminal 550a may be configured to provide signals to the first receiving co- channel radioterminal 550a.
- the first receiving co-channel radioterminal 550a may be configured to process the signals received from the one or more proximate radioterminals so as to improve a quality measure, such as the Bit Error Rate (BER), of the information that is being received from the BTS.
- BER Bit Error Rate
- one or more radioterminals 550b'-550n' that is/are proximate to a second co-channel radioterminal 550a' may be configured to provide signals to the second receiving co-channel radioterminal 550a'.
- the second receiving co-channel radioterminal 550a' may be configured to process the signals received from the one or more proximate radioterminals, so as to improve a quality measure such as the BER of the information that is being received from the BTS. Accordingly, two or more radioterminals such as radioterminals 550a and 550a' may operate co-channel. It also will be understood that some embodiments of Figures 5C may be used in TDD mode as well.
- FIG. 6A A linear receiver processor, in accordance with the well-known Least Mean Squared Error (LMSE) criterion, is illustrated in Figure 6A for non-TDD embodiments.
- LMSE Least Mean Squared Error
- Figure 6A illustrates a receiver for a BTS, but the principles and architecture may also be applied to a radioterminal.
- each antenna of the array 540 operates in two spatial dimensions and provides two signals to the receiver: one corresponding to the first spatial dimension "vertically-polarized” and the other corresponding to the second spatial dimension "horizontally-polarized.”
- each signal of the set ⁇ Vi, Hi, V 2 , H , ...., VN, HN ⁇ is operated on by two transversal filters 610a, 610b; one for each co-channel source (radioterminal).
- the transversal filters may be fractionally spaced, synchronously spaced, or single tap filters.
- a computer simulation has been developed to assess the potential efficacy of the receiver of Figure 6 A.
- Figure 7 graphically illustrates results of the computer simulation.
- the simulation modeled two co-channel radioterminals each transmitting independent data using Binary Phase Shift Keyed (BPSK) modulation with no Forward Error Correction (FEC) coding.
- BPSK Binary Phase Shift Keyed
- FEC Forward Error Correction
- the computer simulation modeled bursty transmission to emulate GSM.
- the channel was assumed static and an a priori known to the receiver training sequence (the burst mid-amble in GSM terminology) was used to estimate the transversal filter coefficients of the receiver.
- the burst mid-amble in GSM terminology was used to estimate the transversal filter coefficients of the receiver.
- a new Rayleigh fading channel was picked pseudo- randomly.
- Flat Rayleigh-fadmg channels were assumed. Consequently, there was no Inter-Symbol Interference (1ST), only non-dispersive Co-channel Interference (CCI) due to the co-channel radioterminal.
- CCI Co-channel Interference
- the Bit Error Rate (BER) was evaluated for several receiver antenna configurations as described below.
- a receiver architecture of Figure 6B may be used.
- the receiver of Figure 6B uses an estimate of the co-channel signal that has minimum noise and/or interference variance to cancel the CCI in the other co-channel signal, thus reducing or minimizing noise enhancement in the other co-channel signal, since a regenerated noise-free estimate of the CCI may now be used in the cancellation.
- the noise and/or interference variance of the two co-channel decision variables S i and S may be estimated once per "data burst." The duration of the data burst may be chosen small relative to the rate-of-change of the channel state so as to validate a static (or quasi-static) channel assumption over a given data burst.
- the noise and/or interference variance of S ⁇ has been found to be smaller than the noise and/or interference variance of the second decision variable, S 2 .
- the decision that is made on S ⁇ assumed correct, may be used to form an improved decision variable S 2 , based on which a decision or a series of decisions may be made regarding the data elements transmitted by the second co-channel radioterminal.
- the one (out of the L) decision variable with minimum noise and/or interference variance will be identified, a decision on it will be made, and that decision will be used to improve the noise and/or interference variance of the second least noise and/or interference variance variable. Then, a decision on the improved second least noise and/or interference variance variable will be made and now both decisions that have been made thus far can be used to improve the decision variable of the third least noise and/or interference variance variable, etc.
- Figure 8 illustrates two radioterminals communicating co-channel bidirectionally with a BTS in a TDD mode according to other embodiments of the present invention.
- a BTS receiver of Figure 6A and/or 6B may be used to process the received waveforms, as was already described, and make decisions on the data that has been transmitted co-channel to the BTS antennas 840 by the radioterminals 830. This function is illustrated by Block 910 of Figure 9.
- the BTS receiver of Figure 9 may also be configured to perform processing of the received waveforms in accordance with the well-known zero-forcing criterion thereby "forcing to zero", to the extent that digital quantization effects and/or other implementation constraints may allow, the ISI and the CCI, at least over the span of the transversal filters used.
- This function is illustrated by Block 920 of Figure 9 and is further illustrated in greater detail in Figure 10.
- the state of the channel may be assumed static or quasi-static provided that the TDD frame interval has been chosen sufficiently small.
- the transversal filter coefficients that have been derived by the BTS receiver to yield "zero" ISI and CCI at the BTS may be used to process or pre-distort a BTS data vector d prior to transmitting it to the co-channel radioterminals.
- the same BTS antenna array may be performing both receive and transmit functions. This function is illustrated by Block 930 of Figure 9 and is further illustrated in greater detail in Figure 11. It also will be understood that some embodiments of Figure 8 may be used in non-TDD mode, as well.
- the information that is transmitted by a BTS, co-channel, for a plurality of radioterminals can arrive at the plurality of co-channel radioterminals free, or substantially free, of ISI and CCI.
- the receiver complexity of a radioterminal may be reduced and the radioterminal may only be equipped with a single linearly-polarized receiver antenna.
- the zero-forcing processing at a BTS receiver as illustrated in Figures 9 and 10 may be omitted and instead, the transversal filter coefficients derived from a LMSE processor (Block 910 of Figure 9) may be used for the transmitter processing (Block 930 of Figure 9) of a BTS. Accordingly, information that is received when wirelessly receiving at least two signals on the same carrier frequency, time interval, and/or code, from a corresponding at least two radioterminals, may be discriminated among the at least two signals.
- a radioterminal may include a transceiver which itself includes a transmitter and a receiver, as illustrated in Figure 12, which perform the transmitting and receiving operations, respectively, that were described herein.
- the antenna of the radioterminal may be regarded as a component of the transceiver.
- a base station may also include a transceiver which itself includes a transmitter and a receiver, as illustrated in Figure 13, which perform the transmitting and receiving operations, respectively, that were described herein.
- the antenna of the base station may be regarded as a component of the transceiver.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/795,875 US7444170B2 (en) | 2003-03-24 | 2004-03-08 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
AU2004223381A AU2004223381C1 (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
CA2517067A CA2517067C (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
PCT/US2004/008880 WO2004086776A2 (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
EP04758074A EP1606956A4 (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
MXPA05010287A MXPA05010287A (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets. |
AU2010201677A AU2010201677B2 (en) | 2003-03-24 | 2010-04-28 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
Applications Claiming Priority (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45711803P | 2003-03-24 | 2003-03-24 | |
US45704303P | 2003-03-24 | 2003-03-24 | |
US60/457,118 | 2003-03-24 | ||
US60/457,043 | 2003-03-24 | ||
US60/473,959 | 2003-05-28 | ||
US47395903P | 2003-05-29 | 2003-05-29 | |
US47752203P | 2003-06-11 | 2003-06-11 | |
US60/477,522 | 2003-06-11 | ||
PCT/US2004/008880 WO2004086776A2 (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004086776A2 true WO2004086776A2 (en) | 2004-10-07 |
WO2004086776A3 WO2004086776A3 (en) | 2007-11-01 |
Family
ID=42104561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/008880 WO2004086776A2 (en) | 2003-03-24 | 2004-03-17 | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
Country Status (6)
Country | Link |
---|---|
US (1) | US7444170B2 (en) |
EP (1) | EP1606956A4 (en) |
AU (2) | AU2004223381C1 (en) |
CA (1) | CA2517067C (en) |
MX (1) | MXPA05010287A (en) |
WO (1) | WO2004086776A2 (en) |
Families Citing this family (110)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7174127B2 (en) | 1999-08-10 | 2007-02-06 | Atc Technologies, Llc | Data communications systems and methods using different wireless links for inbound and outbound data |
US6892068B2 (en) * | 2000-08-02 | 2005-05-10 | Mobile Satellite Ventures, Lp | Coordinated satellite-terrestrial frequency reuse |
US8265637B2 (en) | 2000-08-02 | 2012-09-11 | Atc Technologies, Llc | Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference |
US7558568B2 (en) * | 2003-07-28 | 2009-07-07 | Atc Technologies, Llc | Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference |
US6859652B2 (en) | 2000-08-02 | 2005-02-22 | Mobile Satellite Ventures, Lp | Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis |
US7792488B2 (en) | 2000-12-04 | 2010-09-07 | Atc Technologies, Llc | Systems and methods for transmitting electromagnetic energy over a wireless channel having sufficiently weak measured signal strength |
US7664460B2 (en) | 2001-09-14 | 2010-02-16 | Atc Technologies, Llc | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex and/or frequency-division duplex mode |
US7447501B2 (en) * | 2001-09-14 | 2008-11-04 | Atc Technologies, Llc | Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference |
US7181161B2 (en) * | 2001-09-14 | 2007-02-20 | Atc Technologies, Llc | Multi-band/multi-mode satellite radiotelephone communications systems and methods |
US7062267B2 (en) * | 2001-09-14 | 2006-06-13 | Atc Technologies, Llc | Methods and systems for modifying satellite antenna cell patterns in response to terrestrial reuse of satellite frequencies |
US7792069B2 (en) | 2001-09-14 | 2010-09-07 | Atc Technologies, Llc | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum using different channel separation technologies in forward and reverse links |
US7623859B2 (en) | 2001-09-14 | 2009-11-24 | Atc Technologies, Llc | Additional aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods |
US7006789B2 (en) * | 2001-09-14 | 2006-02-28 | Atc Technologies, Llc | Space-based network architectures for satellite radiotelephone systems |
US8270898B2 (en) | 2001-09-14 | 2012-09-18 | Atc Technologies, Llc | Satellite-band spectrum utilization for reduced or minimum interference |
US6999720B2 (en) * | 2001-09-14 | 2006-02-14 | Atc Technologies, Llc | Spatial guardbands for terrestrial reuse of satellite frequencies |
US7603117B2 (en) | 2001-09-14 | 2009-10-13 | Atc Technologies, Llc | Systems and methods for terrestrial use of cellular satellite frequency spectrum |
US7113778B2 (en) | 2001-09-14 | 2006-09-26 | Atc Technologies, Llc | Aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods |
US6785543B2 (en) | 2001-09-14 | 2004-08-31 | Mobile Satellite Ventures, Lp | Filters for combined radiotelephone/GPS terminals |
US7890098B2 (en) | 2001-09-14 | 2011-02-15 | Atc Technologies, Llc | Staggered sectorization for terrestrial reuse of satellite frequencies |
US7218931B2 (en) * | 2001-09-14 | 2007-05-15 | Atc Technologies, Llc | Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems |
US7593724B2 (en) * | 2001-09-14 | 2009-09-22 | Atc Technologies, Llc | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode |
US7155340B2 (en) | 2001-09-14 | 2006-12-26 | Atc Technologies, Llc | Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates |
US7603081B2 (en) | 2001-09-14 | 2009-10-13 | Atc Technologies, Llc | Radiotelephones and operating methods that use a single radio frequency chain and a single baseband processor for space-based and terrestrial communications |
US6856787B2 (en) | 2002-02-12 | 2005-02-15 | Mobile Satellite Ventures, Lp | Wireless communications systems and methods using satellite-linked remote terminal interface subsystems |
US7593691B2 (en) | 2002-02-12 | 2009-09-22 | Atc Technologies, Llc | Systems and methods for controlling a level of interference to a wireless receiver responsive to a power level associated with a wireless transmitter |
US6937857B2 (en) * | 2002-05-28 | 2005-08-30 | Mobile Satellite Ventures, Lp | Systems and methods for reducing satellite feeder link bandwidth/carriers in cellular satellite systems |
US7092708B2 (en) * | 2002-12-12 | 2006-08-15 | Atc Technologies, Llc | Systems and methods for increasing capacity and/or quality of service of terrestrial cellular and satellite systems using terrestrial reception of satellite band frequencies |
GB2396775B (en) * | 2002-12-23 | 2005-04-13 | Motorola Inc | Method and apparatus for establishing direct communication for mobiles in a radio communication system |
US7203490B2 (en) | 2003-03-24 | 2007-04-10 | Atc Technologies, Llc | Satellite assisted push-to-send radioterminal systems and methods |
US7444170B2 (en) * | 2003-03-24 | 2008-10-28 | Atc Technologies, Llc | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
US6879829B2 (en) * | 2003-05-16 | 2005-04-12 | Mobile Satellite Ventures, Lp | Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially reused satellite frequencies at a radioterminal to reduce potential interference |
US20040240525A1 (en) * | 2003-05-29 | 2004-12-02 | Karabinis Peter D. | Wireless communications methods and apparatus using licensed-use system protocols with unlicensed-use access points |
US7340213B2 (en) * | 2003-07-30 | 2008-03-04 | Atc Technologies, Llc | Intra- and/or inter-system interference reducing systems and methods for satellite communications systems |
US8670705B2 (en) * | 2003-07-30 | 2014-03-11 | Atc Technologies, Llc | Additional intra-and/or inter-system interference reducing systems and methods for satellite communications systems |
US20050041619A1 (en) * | 2003-08-22 | 2005-02-24 | Karabinis Peter D. | Wireless systems, methods and devices employing forward- and/or return-link carriers having different numbers of sub-band carriers |
US7113743B2 (en) | 2003-09-11 | 2006-09-26 | Atc Technologies, Llc | Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint |
WO2005032170A2 (en) | 2003-09-23 | 2005-04-07 | Atc Technologies, Llc | Systems and methods for mobility management in overlaid satellite and terrestrial communications systems |
CN1622677A (en) * | 2003-11-27 | 2005-06-01 | 皇家飞利浦电子股份有限公司 | A method for supporting point-to-point communication switch in wireless communication network |
US8380186B2 (en) * | 2004-01-22 | 2013-02-19 | Atc Technologies, Llc | Satellite with different size service link antennas and radioterminal communication methods using same |
US7418236B2 (en) * | 2004-04-20 | 2008-08-26 | Mobile Satellite Ventures, Lp | Extraterrestrial communications systems and methods including ancillary extraterrestrial components |
US8655398B2 (en) | 2004-03-08 | 2014-02-18 | Atc Technologies, Llc | Communications systems and methods including emission detection |
US7933552B2 (en) * | 2004-03-22 | 2011-04-26 | Atc Technologies, Llc | Multi-band satellite and/or ancillary terrestrial component radioterminal communications systems and methods with combining operation |
US7606590B2 (en) | 2004-04-07 | 2009-10-20 | Atc Technologies, Llc | Satellite/hands-free interlock systems and/or companion devices for radioterminals and related methods |
US7161988B2 (en) * | 2004-04-12 | 2007-01-09 | The Directv Group, Inc. | Method and apparatus for minimizing co-channel interference |
US8213553B2 (en) * | 2004-04-12 | 2012-07-03 | The Directv Group, Inc. | Method and apparatus for identifying co-channel interference |
JP2007533263A (en) * | 2004-04-12 | 2007-11-15 | ザ・ディレクティービー・グループ・インコーポレイテッド | Shift channel characteristics to mitigate co-channel interference |
US7672285B2 (en) * | 2004-06-28 | 2010-03-02 | Dtvg Licensing, Inc. | Method and apparatus for minimizing co-channel interference by scrambling |
US7636566B2 (en) * | 2004-04-12 | 2009-12-22 | Atc Technologies, Llc | Systems and method with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network |
US20050239399A1 (en) * | 2004-04-21 | 2005-10-27 | Karabinis Peter D | Mobile terminals and set top boxes including multiple satellite band service links, and related systems and methods |
US8265549B2 (en) | 2004-05-18 | 2012-09-11 | Atc Technologies, Llc | Satellite communications systems and methods using radiotelephone |
US20050260984A1 (en) * | 2004-05-21 | 2005-11-24 | Mobile Satellite Ventures, Lp | Systems and methods for space-based use of terrestrial cellular frequency spectrum |
US7706748B2 (en) * | 2004-06-25 | 2010-04-27 | Atc Technologies, Llc | Methods of ground based beamforming and on-board frequency translation and related systems |
CA2576521C (en) | 2004-08-11 | 2016-09-20 | Atc Technologies, Llc | Satellite-band spectrum utilization for reduced or minimum interference |
US20060094420A1 (en) * | 2004-11-02 | 2006-05-04 | Karabinis Peter D | Multi frequency band/multi air interface/multi spectrum reuse cluster size/multi cell size satellite radioterminal communicaitons systems and methods |
US7639981B2 (en) * | 2004-11-02 | 2009-12-29 | Atc Technologies, Llc | Apparatus and methods for power control in satellite communications systems with satellite-linked terrestrial stations |
WO2006055648A2 (en) * | 2004-11-16 | 2006-05-26 | Atc Technologies, Llc | Satellite communications systems, components and methods for operating shared satellite gateways |
US7747229B2 (en) * | 2004-11-19 | 2010-06-29 | Atc Technologies, Llc | Electronic antenna beam steering using ancillary receivers and related methods |
US7454175B2 (en) | 2004-12-07 | 2008-11-18 | Atc Technologies, Llc | Broadband wireless communications systems and methods using multiple non-contiguous frequency bands/segments |
US8594704B2 (en) | 2004-12-16 | 2013-11-26 | Atc Technologies, Llc | Location-based broadcast messaging for radioterminal users |
EP2254265A3 (en) | 2005-01-05 | 2013-11-27 | ATC Technologies, LLC | Adaptive beam forming with multi-user detection and interference reduction in satellite communication systems and methods |
US7596111B2 (en) | 2005-01-27 | 2009-09-29 | Atc Technologies, Llc | Satellite/terrestrial wireless communications systems and methods using disparate channel separation codes |
US7636546B2 (en) * | 2005-02-22 | 2009-12-22 | Atc Technologies, Llc | Satellite communications systems and methods using diverse polarizations |
WO2006091605A2 (en) * | 2005-02-22 | 2006-08-31 | Atc Technologies, Llc | Reusing frequencies of a fixed and/or mobile communications system |
US7738837B2 (en) * | 2005-02-22 | 2010-06-15 | Atc Technologies, Llc | Satellites using inter-satellite links to create indirect feeder link paths |
US7756490B2 (en) | 2005-03-08 | 2010-07-13 | Atc Technologies, Llc | Methods, radioterminals, and ancillary terrestrial components for communicating using spectrum allocated to another satellite operator |
US8515359B2 (en) * | 2005-03-09 | 2013-08-20 | Intel Corporation | Method and apparatus to provide low cost transmit beamforming for network devices |
US7796986B2 (en) * | 2005-03-11 | 2010-09-14 | Atc Technologies, Llc | Modification of transmission values to compensate for interference in a satellite down-link communications |
US7627285B2 (en) | 2005-03-14 | 2009-12-01 | Atc Technologies, Llc | Satellite communications systems and methods with distributed and/or centralized architecture including ground-based beam forming |
WO2006099443A1 (en) | 2005-03-15 | 2006-09-21 | Atc Technologies, Llc | Intra-system and/or inter-system reuse of feeder link frequencies including interference suppression systems and methods |
WO2006099501A1 (en) * | 2005-03-15 | 2006-09-21 | Atc Technologies, Llc | Methods and systems providing adaptive feeder links for ground based beam forming and related systems and satellites |
US7453396B2 (en) | 2005-04-04 | 2008-11-18 | Atc Technologies, Llc | Radioterminals and associated operating methods that alternate transmission of wireless communications and processing of global positioning system signals |
US7817967B2 (en) * | 2005-06-21 | 2010-10-19 | Atc Technologies, Llc | Communications systems including adaptive antenna systems and methods for inter-system and intra-system interference reduction |
USRE47633E1 (en) | 2005-06-22 | 2019-10-01 | Odyssey Wireless Inc. | Systems/methods of conducting a financial transaction using a smartphone |
US8233554B2 (en) | 2010-03-29 | 2012-07-31 | Eices Research, Inc. | Increased capacity communications for OFDM-based wireless communications systems/methods/devices |
US8670493B2 (en) | 2005-06-22 | 2014-03-11 | Eices Research, Inc. | Systems and/or methods of increased privacy wireless communications |
US7970345B2 (en) | 2005-06-22 | 2011-06-28 | Atc Technologies, Llc | Systems and methods of waveform and/or information splitting for wireless transmission of information to one or more radioterminals over a plurality of transmission paths and/or system elements |
US7907944B2 (en) | 2005-07-05 | 2011-03-15 | Atc Technologies, Llc | Methods, apparatus and computer program products for joint decoding of access probes in a CDMA communications system |
US7593753B1 (en) * | 2005-07-19 | 2009-09-22 | Sprint Communications Company L.P. | Base station antenna system employing circular polarization and angular notch filtering |
US8190114B2 (en) * | 2005-07-20 | 2012-05-29 | Atc Technologies, Llc | Frequency-dependent filtering for wireless communications transmitters |
US7623867B2 (en) * | 2005-07-29 | 2009-11-24 | Atc Technologies, Llc | Satellite communications apparatus and methods using asymmetrical forward and return link frequency reuse |
US7831202B2 (en) | 2005-08-09 | 2010-11-09 | Atc Technologies, Llc | Satellite communications systems and methods using substantially co-located feeder link antennas |
CN101248606B (en) * | 2005-08-26 | 2013-05-15 | 直视集团公司 | Methods and apparatuses for determining scrambling codes for signal transmission |
WO2007047370A2 (en) | 2005-10-12 | 2007-04-26 | Atc Technologies, Llc | Systems, methods and computer program products for mobility management in hybrid satellite/terrestrial wireless communications systems |
WO2007084682A1 (en) | 2006-01-20 | 2007-07-26 | Atc Technologies, Llc | Systems and methods for forward link closed loop beamforming |
US8705436B2 (en) | 2006-02-15 | 2014-04-22 | Atc Technologies, Llc | Adaptive spotbeam broadcasting, systems, methods and devices for high bandwidth content distribution over satellite |
US8923850B2 (en) | 2006-04-13 | 2014-12-30 | Atc Technologies, Llc | Systems and methods for controlling base station sectors to reduce potential interference with low elevation satellites |
US7751823B2 (en) | 2006-04-13 | 2010-07-06 | Atc Technologies, Llc | Systems and methods for controlling a level of interference to a wireless receiver responsive to an activity factor associated with a wireless transmitter |
US9014619B2 (en) | 2006-05-30 | 2015-04-21 | Atc Technologies, Llc | Methods and systems for satellite communications employing ground-based beam forming with spatially distributed hybrid matrix amplifiers |
US8169955B2 (en) | 2006-06-19 | 2012-05-01 | Atc Technologies, Llc | Systems and methods for orthogonal frequency division multiple access (OFDMA) communications over satellite links |
US8526941B2 (en) | 2006-06-29 | 2013-09-03 | Atc Technologies, Llc | Apparatus and methods for mobility management in hybrid terrestrial-satellite mobile communications systems |
US7778211B2 (en) * | 2006-09-26 | 2010-08-17 | Cisco Technology, Inc. | Method for computing a downlink beamforming weighting vector based on up link channel information |
US8031646B2 (en) | 2007-05-15 | 2011-10-04 | Atc Technologies, Llc | Systems, methods and devices for reusing spectrum of another operator |
US8064824B2 (en) | 2007-07-03 | 2011-11-22 | Atc Technologies, Llc | Systems and methods for reducing power robbing impact of interference to a satellite |
US7978135B2 (en) | 2008-02-15 | 2011-07-12 | Atc Technologies, Llc | Antenna beam forming systems/methods using unconstrained phase response |
US9374746B1 (en) | 2008-07-07 | 2016-06-21 | Odyssey Wireless, Inc. | Systems/methods of spatial multiplexing |
US8433241B2 (en) | 2008-08-06 | 2013-04-30 | Atc Technologies, Llc | Systems, methods and devices for overlaid operations of satellite and terrestrial wireless communications systems |
US8193975B2 (en) | 2008-11-12 | 2012-06-05 | Atc Technologies | Iterative antenna beam forming systems/methods |
US8339308B2 (en) | 2009-03-16 | 2012-12-25 | Atc Technologies Llc | Antenna beam forming systems, methods and devices using phase adjusted least squares beam forming |
US8520561B2 (en) | 2009-06-09 | 2013-08-27 | Atc Technologies, Llc | Systems, methods and network components that provide different satellite spot beam return carrier groupings and reuse patterns |
EP2484027B1 (en) | 2009-09-28 | 2017-03-29 | ATC Technologies, LLC | Systems and methods for adaptive interference cancellation beamforming |
US10110288B2 (en) | 2009-11-04 | 2018-10-23 | Atc Technologies, Llc | Frequency division duplex (FDD) return link transmit diversity systems, methods and devices using forward link side information |
US8274925B2 (en) | 2010-01-05 | 2012-09-25 | Atc Technologies, Llc | Retaining traffic channel assignments for satellite terminals to provide lower latency communication services |
CN101800678B (en) * | 2010-03-12 | 2012-05-23 | 华为技术有限公司 | Microwave transmission method, device and system applying CCDP and XPIC |
US9806790B2 (en) | 2010-03-29 | 2017-10-31 | Odyssey Wireless, Inc. | Systems/methods of spectrally efficient communications |
US10560244B2 (en) * | 2013-07-24 | 2020-02-11 | At&T Intellectual Property I, L.P. | System and method for reducing inter-cellsite interference in full-duplex communications |
US10334515B2 (en) | 2017-01-13 | 2019-06-25 | ENK Wireless, Inc. | Conveying information via auxiliary device selection |
US11100796B2 (en) | 2018-05-07 | 2021-08-24 | ENK Wireless, Inc. | Systems/methods of improving vehicular safety |
US10681716B2 (en) | 2018-05-07 | 2020-06-09 | ENK Wireless, Inc. | Systems/methods of providing increased wireless capacity, vehicular safety, electrical power wirelessly, and device control responsive to geographic position |
US11075740B2 (en) | 2018-05-07 | 2021-07-27 | ENK Wireless, Inc. | Systems/methods of communications using a plurality of cooperative devices |
US10804998B2 (en) | 2018-05-07 | 2020-10-13 | ENK Wireless, Inc. | Systems/methods of providing increased wireless capacity, vehicular safety, electrical power wirelessly, and device control responsive to geographic position |
Family Cites Families (102)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5303286A (en) * | 1991-03-29 | 1994-04-12 | Space Systems/Loral, Inc. | Wireless telephone/satellite roaming system |
US4901307A (en) * | 1986-10-17 | 1990-02-13 | Qualcomm, Inc. | Spread spectrum multiple access communication system using satellite or terrestrial repeaters |
US5327572A (en) * | 1990-03-06 | 1994-07-05 | Motorola, Inc. | Networked satellite and terrestrial cellular radiotelephone systems |
US5073900A (en) * | 1990-03-19 | 1991-12-17 | Mallinckrodt Albert J | Integrated cellular communications system |
US5835857A (en) * | 1990-03-19 | 1998-11-10 | Celsat America, Inc. | Position determination for reducing unauthorized use of a communication system |
US5878329A (en) * | 1990-03-19 | 1999-03-02 | Celsat America, Inc. | Power control of an integrated cellular communications system |
US5446756A (en) * | 1990-03-19 | 1995-08-29 | Celsat America, Inc. | Integrated cellular communications system |
US6067442A (en) * | 1991-10-10 | 2000-05-23 | Globalstar L.P. | Satellite communications system having distributed user assignment and resource assignment with terrestrial gateways |
US5526404A (en) * | 1991-10-10 | 1996-06-11 | Space Systems/Loral, Inc. | Worldwide satellite telephone system and a network coordinating gateway for allocating satellite and terrestrial gateway resources |
US5619503A (en) | 1994-01-11 | 1997-04-08 | Ericsson Inc. | Cellular/satellite communications system with improved frequency re-use |
US6157811A (en) | 1994-01-11 | 2000-12-05 | Ericsson Inc. | Cellular/satellite communications system with improved frequency re-use |
US5724666A (en) * | 1994-03-24 | 1998-03-03 | Ericsson Inc. | Polarization diversity phased array cellular base station and associated methods |
US5511233A (en) * | 1994-04-05 | 1996-04-23 | Celsat America, Inc. | System and method for mobile communications in coexistence with established communications systems |
WO1995034153A1 (en) | 1994-06-08 | 1995-12-14 | Hughes Aircraft Company | Apparatus and method for hybrid network access |
US5754961A (en) * | 1994-06-20 | 1998-05-19 | Kabushiki Kaisha Toshiba | Radio communication system including SDL having transmission rate of relatively high speed |
US5584046A (en) | 1994-11-04 | 1996-12-10 | Cornell Research Foundation, Inc. | Method and apparatus for spectrum sharing between satellite and terrestrial communication services using temporal and spatial synchronization |
FR2729025B1 (en) * | 1995-01-02 | 1997-03-21 | Europ Agence Spatiale | METHOD AND SYSTEM FOR TRANSMITTING RADIO SIGNALS VIA A SATELLITE NETWORK BETWEEN A FIXED EARTH STATION AND MOBILE USER TERMINALS |
US6240124B1 (en) * | 1995-06-06 | 2001-05-29 | Globalstar L.P. | Closed loop power control for low earth orbit satellite communications system |
US5619525A (en) * | 1995-06-06 | 1997-04-08 | Globalstar L.P. | Closed loop power control for low earth orbit satellite communications system |
US5991345A (en) | 1995-09-22 | 1999-11-23 | Qualcomm Incorporated | Method and apparatus for diversity enhancement using pseudo-multipath signals |
US6449461B1 (en) * | 1996-07-15 | 2002-09-10 | Celsat America, Inc. | System for mobile communications in coexistence with communication systems having priority |
US5926758A (en) * | 1996-08-26 | 1999-07-20 | Leo One Ip, L.L.C. | Radio frequency sharing methods for satellite systems |
US6072768A (en) * | 1996-09-04 | 2000-06-06 | Globalstar L.P. | Automatic satellite/terrestrial mobile terminal roaming system and method |
GB2317074B (en) | 1996-09-09 | 1998-10-28 | I Co Global Communications | Communications apparatus and method |
GB2317303B (en) * | 1996-09-09 | 1998-08-26 | I Co Global Communications | Communications apparatus and method |
US5761605A (en) * | 1996-10-11 | 1998-06-02 | Northpoint Technology, Ltd. | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
US5896558A (en) | 1996-12-19 | 1999-04-20 | Globalstar L.P. | Interactive fixed and mobile satellite network |
US6091933A (en) * | 1997-01-03 | 2000-07-18 | Globalstar L.P. | Multiple satellite system power allocation by communication link optimization |
US5872544A (en) * | 1997-02-04 | 1999-02-16 | Gec-Marconi Hazeltine Corporation Electronic Systems Division | Cellular antennas with improved front-to-back performance |
US5933421A (en) * | 1997-02-06 | 1999-08-03 | At&T Wireless Services Inc. | Method for frequency division duplex communications |
JPH10261987A (en) * | 1997-03-19 | 1998-09-29 | Fujitsu Ltd | Two-layer constitution satellite communication system and its geostationary satellite |
US5937332A (en) * | 1997-03-21 | 1999-08-10 | Ericsson, Inc. | Satellite telecommunications repeaters and retransmission methods |
EP0869628A1 (en) * | 1997-04-01 | 1998-10-07 | ICO Services Ltd. | Interworking between telecommunications networks |
GB2324218A (en) * | 1997-04-09 | 1998-10-14 | Ico Services Ltd | Satellite acquisition in navigation system |
US5884142A (en) * | 1997-04-15 | 1999-03-16 | Globalstar L.P. | Low earth orbit distributed gateway communication system |
US6032041A (en) * | 1997-06-02 | 2000-02-29 | Hughes Electronics Corporation | Method and system for providing wideband communications to mobile users in a satellite-based network |
US6134437A (en) * | 1997-06-13 | 2000-10-17 | Ericsson Inc. | Dual-mode satellite/cellular phone architecture with physically separable mode |
US6011951A (en) * | 1997-08-22 | 2000-01-04 | Teledesic Llc | Technique for sharing radio frequency spectrum in multiple satellite communication systems |
US6085094A (en) * | 1997-08-29 | 2000-07-04 | Nortel Networks Corporation | Method for optimizing spectral re-use |
US6052586A (en) * | 1997-08-29 | 2000-04-18 | Ericsson Inc. | Fixed and mobile satellite radiotelephone systems and methods with capacity sharing |
US5907541A (en) * | 1997-09-17 | 1999-05-25 | Lockheed Martin Corp. | Architecture for an integrated mobile and fixed telecommunications system including a spacecraft |
US6101385A (en) * | 1997-10-09 | 2000-08-08 | Globalstar L.P. | Satellite communication service with non-congruent sub-beam coverage |
US6052560A (en) * | 1997-10-15 | 2000-04-18 | Ericsson Inc | Satellite system utilizing a plurality of air interface standards and method employing same |
US6157834A (en) | 1997-12-29 | 2000-12-05 | Motorola, Inc. | Terrestrial and satellite cellular network interoperability |
US6418147B1 (en) * | 1998-01-21 | 2002-07-09 | Globalstar Lp | Multiple vocoder mobile satellite telephone system |
US6205337B1 (en) * | 1998-05-06 | 2001-03-20 | Alcatel Canada Inc. | Use of sectorized polarization diversity as a means of increasing capacity in cellular wireless systems |
US6411824B1 (en) * | 1998-06-24 | 2002-06-25 | Conexant Systems, Inc. | Polarization-adaptive antenna transmit diversity system |
US6735437B2 (en) * | 1998-06-26 | 2004-05-11 | Hughes Electronics Corporation | Communication system employing reuse of satellite spectrum for terrestrial communication |
US6418316B2 (en) * | 1998-08-06 | 2002-07-09 | Harris Corporation | Increasing channel capacity of wireless local loop via polarization diversity antenna distribution scheme |
US6775251B1 (en) * | 1998-09-17 | 2004-08-10 | Globalstar L.P. | Satellite communication system providing multi-gateway diversity and improved satellite loading |
US6198730B1 (en) * | 1998-10-13 | 2001-03-06 | Motorola, Inc. | Systems and method for use in a dual mode satellite communications system |
US6198921B1 (en) * | 1998-11-16 | 2001-03-06 | Emil Youssefzadeh | Method and system for providing rural subscriber telephony service using an integrated satellite/cell system |
US6377817B1 (en) * | 1999-05-03 | 2002-04-23 | Nokia Mobile Phones Ltd. | Asymmetric data transmission for use in a multi-modulation environment |
US6253080B1 (en) * | 1999-07-08 | 2001-06-26 | Globalstar L.P. | Low earth orbit distributed gateway communication system |
US7174127B2 (en) * | 1999-08-10 | 2007-02-06 | Atc Technologies, Llc | Data communications systems and methods using different wireless links for inbound and outbound data |
US20030149986A1 (en) * | 1999-08-10 | 2003-08-07 | Mayfield William W. | Security system for defeating satellite television piracy |
US6522865B1 (en) * | 1999-08-10 | 2003-02-18 | David D. Otten | Hybrid satellite communications system |
GB2365677A (en) * | 2000-02-29 | 2002-02-20 | Ico Services Ltd | Satellite communications with satellite routing according to channels assignment |
US6526278B1 (en) * | 2000-03-03 | 2003-02-25 | Motorola, Inc. | Mobile satellite communication system utilizing polarization diversity combining |
US6785510B2 (en) * | 2000-03-09 | 2004-08-31 | Salbu Resarch & Development (Proprietary) Limited | Routing in a multi-station network |
US6535105B2 (en) * | 2000-03-30 | 2003-03-18 | Avx Corporation | Electronic device and process of making electronic device |
US20040203393A1 (en) | 2002-03-13 | 2004-10-14 | Xiang Chen | System and method for offsetting channel spectrum to reduce interference between two communication networks |
US7558568B2 (en) * | 2003-07-28 | 2009-07-07 | Atc Technologies, Llc | Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference |
US6892068B2 (en) * | 2000-08-02 | 2005-05-10 | Mobile Satellite Ventures, Lp | Coordinated satellite-terrestrial frequency reuse |
US6859652B2 (en) * | 2000-08-02 | 2005-02-22 | Mobile Satellite Ventures, Lp | Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis |
US6628919B1 (en) * | 2000-08-09 | 2003-09-30 | Hughes Electronics Corporation | Low-cost multi-mission broadband communications payload |
US20030003815A1 (en) * | 2000-12-20 | 2003-01-02 | Yoshiko Yamada | Communication satellite/land circuits selection communications system |
US6950625B2 (en) * | 2001-02-12 | 2005-09-27 | Ico Services Limited | Communications apparatus and method |
US6714760B2 (en) | 2001-05-10 | 2004-03-30 | Qualcomm Incorporated | Multi-mode satellite and terrestrial communication device |
US6549759B2 (en) * | 2001-08-24 | 2003-04-15 | Ensemble Communications, Inc. | Asymmetric adaptive modulation in a wireless communication system |
US7181161B2 (en) * | 2001-09-14 | 2007-02-20 | Atc Technologies, Llc | Multi-band/multi-mode satellite radiotelephone communications systems and methods |
US7218931B2 (en) * | 2001-09-14 | 2007-05-15 | Atc Technologies, Llc | Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems |
US7593724B2 (en) * | 2001-09-14 | 2009-09-22 | Atc Technologies, Llc | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode |
US7447501B2 (en) * | 2001-09-14 | 2008-11-04 | Atc Technologies, Llc | Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference |
US7031702B2 (en) * | 2001-09-14 | 2006-04-18 | Atc Technologies, Llc | Additional systems and methods for monitoring terrestrially reused satellite frequencies to reduce potential interference |
US6999720B2 (en) * | 2001-09-14 | 2006-02-14 | Atc Technologies, Llc | Spatial guardbands for terrestrial reuse of satellite frequencies |
US6684057B2 (en) * | 2001-09-14 | 2004-01-27 | Mobile Satellite Ventures, Lp | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum |
US7062267B2 (en) * | 2001-09-14 | 2006-06-13 | Atc Technologies, Llc | Methods and systems for modifying satellite antenna cell patterns in response to terrestrial reuse of satellite frequencies |
US7039400B2 (en) * | 2001-09-14 | 2006-05-02 | Atc Technologies, Llc | Systems and methods for monitoring terrestrially reused satellite frequencies to reduce potential interference |
US7113778B2 (en) * | 2001-09-14 | 2006-09-26 | Atc Technologies, Llc | Aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods |
US7664460B2 (en) * | 2001-09-14 | 2010-02-16 | Atc Technologies, Llc | Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex and/or frequency-division duplex mode |
US7155340B2 (en) * | 2001-09-14 | 2006-12-26 | Atc Technologies, Llc | Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates |
US6785543B2 (en) * | 2001-09-14 | 2004-08-31 | Mobile Satellite Ventures, Lp | Filters for combined radiotelephone/GPS terminals |
US7006789B2 (en) * | 2001-09-14 | 2006-02-28 | Atc Technologies, Llc | Space-based network architectures for satellite radiotelephone systems |
US6856787B2 (en) * | 2002-02-12 | 2005-02-15 | Mobile Satellite Ventures, Lp | Wireless communications systems and methods using satellite-linked remote terminal interface subsystems |
US6937857B2 (en) * | 2002-05-28 | 2005-08-30 | Mobile Satellite Ventures, Lp | Systems and methods for reducing satellite feeder link bandwidth/carriers in cellular satellite systems |
US8121605B2 (en) * | 2002-06-27 | 2012-02-21 | Globalstar, Inc. | Resource allocation to terrestrial and satellite services |
US7068975B2 (en) * | 2002-11-26 | 2006-06-27 | The Directv Group, Inc. | Systems and methods for sharing uplink bandwidth among satellites in a common orbital slot |
US7092708B2 (en) | 2002-12-12 | 2006-08-15 | Atc Technologies, Llc | Systems and methods for increasing capacity and/or quality of service of terrestrial cellular and satellite systems using terrestrial reception of satellite band frequencies |
US6975837B1 (en) | 2003-01-21 | 2005-12-13 | The Directv Group, Inc. | Method and apparatus for reducing interference between terrestrially-based and space-based broadcast systems |
US7444170B2 (en) | 2003-03-24 | 2008-10-28 | Atc Technologies, Llc | Co-channel wireless communication methods and systems using nonsymmetrical alphabets |
US7203490B2 (en) * | 2003-03-24 | 2007-04-10 | Atc Technologies, Llc | Satellite assisted push-to-send radioterminal systems and methods |
US6879829B2 (en) * | 2003-05-16 | 2005-04-12 | Mobile Satellite Ventures, Lp | Systems and methods for handover between space based and terrestrial radioterminal communications, and for monitoring terrestrially reused satellite frequencies at a radioterminal to reduce potential interference |
DE602004012250T2 (en) * | 2003-05-28 | 2009-03-19 | Telefonaktiebolaget Lm Ericsson (Publ) | METHOD AND SYSTEM FOR WIRELESS COMMUNICATION NETWORKS WITH FORWARDING |
US20040240525A1 (en) | 2003-05-29 | 2004-12-02 | Karabinis Peter D. | Wireless communications methods and apparatus using licensed-use system protocols with unlicensed-use access points |
US7340213B2 (en) * | 2003-07-30 | 2008-03-04 | Atc Technologies, Llc | Intra- and/or inter-system interference reducing systems and methods for satellite communications systems |
US8670705B2 (en) * | 2003-07-30 | 2014-03-11 | Atc Technologies, Llc | Additional intra-and/or inter-system interference reducing systems and methods for satellite communications systems |
US20050041619A1 (en) * | 2003-08-22 | 2005-02-24 | Karabinis Peter D. | Wireless systems, methods and devices employing forward- and/or return-link carriers having different numbers of sub-band carriers |
US7113743B2 (en) * | 2003-09-11 | 2006-09-26 | Atc Technologies, Llc | Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint |
WO2005032170A2 (en) * | 2003-09-23 | 2005-04-07 | Atc Technologies, Llc | Systems and methods for mobility management in overlaid satellite and terrestrial communications systems |
US8380186B2 (en) * | 2004-01-22 | 2013-02-19 | Atc Technologies, Llc | Satellite with different size service link antennas and radioterminal communication methods using same |
US7453920B2 (en) * | 2004-03-09 | 2008-11-18 | Atc Technologies, Llc | Code synchronization in CDMA satellite wireless communications system using uplink channel detection |
-
2004
- 2004-03-08 US US10/795,875 patent/US7444170B2/en not_active Expired - Fee Related
- 2004-03-17 CA CA2517067A patent/CA2517067C/en not_active Expired - Fee Related
- 2004-03-17 MX MXPA05010287A patent/MXPA05010287A/en active IP Right Grant
- 2004-03-17 EP EP04758074A patent/EP1606956A4/en not_active Withdrawn
- 2004-03-17 WO PCT/US2004/008880 patent/WO2004086776A2/en active Application Filing
- 2004-03-17 AU AU2004223381A patent/AU2004223381C1/en not_active Ceased
-
2010
- 2010-04-28 AU AU2010201677A patent/AU2010201677B2/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of EP1606956A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1606956A2 (en) | 2005-12-21 |
AU2004223381A1 (en) | 2004-10-07 |
WO2004086776A3 (en) | 2007-11-01 |
EP1606956A4 (en) | 2011-04-27 |
US20040192395A1 (en) | 2004-09-30 |
AU2010201677A1 (en) | 2010-05-20 |
US7444170B2 (en) | 2008-10-28 |
CA2517067C (en) | 2014-11-18 |
AU2010201677B2 (en) | 2011-08-18 |
AU2004223381B2 (en) | 2010-06-10 |
AU2004223381C1 (en) | 2010-10-28 |
CA2517067A1 (en) | 2004-10-07 |
MXPA05010287A (en) | 2005-11-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU2004223381C1 (en) | Co-channel wireless communication methods and systems using nonsymmetrical alphabets | |
CA2863510C (en) | Co-channel wireless communication methods and systems using nonsymmetrical alphabets | |
Cavers | Single-user and multiuser adaptive maximal ratio transmission for Rayleigh channels | |
US8155233B1 (en) | MIMO decoding in the presence of various interfering sources | |
EP1349297A1 (en) | A closed loop multiple antenna system | |
US8265213B2 (en) | Method and apparatus for cancellation of partially known interference using transmit diversity based interference cancellation | |
Wennstrom et al. | Transmit antenna diversity in Ricean fading MIMO channels with co-channel interference | |
Toka et al. | Performance analyses of MRT/MRC in dual-hop NOMA full-duplex AF relay networks with residual hardware impairments | |
Cavers | Multiuser transmitter diversity through adaptive downlink beamforming | |
Wang et al. | To cooperate or not: A capacity perspective | |
Jang et al. | On BER analysis and comparison for OSTBC MIMO DF relaying networks | |
Al-Qahtani et al. | Relay Selection in Distributed Orthogonal Space-Time Block Coded Networks | |
Al-Qahtani et al. | Alamouti distributed space-time coding with relay selection | |
Abeden et al. | Response of Channel Inversion Technique with Space Time Block Code in Multi-User MIMO | |
Ho et al. | Two-way relaying with multiple antennas using covariance feedback | |
Roopa et al. | Performance Improvement Of MIMO System Using OSTBC Scheme and ML Detection Technique Under Rayleigh Channel | |
Liang et al. | Combining transmit beamforming, space-time block coding and delay spread reduction | |
Cavers | Single User and Multiuser Adaptive Transmitter Diversity for Rayleigh Channels | |
Eldenferia et al. | The performance of Space Time Block Coding (STBC) in MIMO relay network | |
Zhao et al. | Linear transceiver design for relay-assisted broadcast systems with diagonal scaling | |
Kang et al. | An Adaptive Cooperative Transmission Scheme According to the User Location | |
Yoon et al. | Design of MIMO-OFDM multi-hop relaying with cooperative base station | |
Agubor et al. | Comparative Analysis of Multiple and Single Antenna Applications in Mobile Wireless Communication | |
Pusane et al. | Power control for orthogonal space-time coding with multiple receive antennas | |
Sohaib | Energy efficient cooperative wireless communications |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2004758074 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004223381 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2517067 Country of ref document: CA |
|
ENP | Entry into the national phase |
Ref document number: 2004223381 Country of ref document: AU Date of ref document: 20040317 Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2004223381 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2005/010287 Country of ref document: MX |
|
WWP | Wipo information: published in national office |
Ref document number: 2004758074 Country of ref document: EP |