US20020090038A1 - Space time block coded transmit antenna diversity for WCDMA - Google Patents
Space time block coded transmit antenna diversity for WCDMA Download PDFInfo
- Publication number
- US20020090038A1 US20020090038A1 US09/941,286 US94128601A US2002090038A1 US 20020090038 A1 US20020090038 A1 US 20020090038A1 US 94128601 A US94128601 A US 94128601A US 2002090038 A1 US2002090038 A1 US 2002090038A1
- Authority
- US
- United States
- Prior art keywords
- signals
- symbol
- signal
- circuit
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0065—Serial concatenated codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0631—Receiver arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A mobile communication system is designed with an input circuit coupled to receive a first plurality of signals (rj(i+τj), i=0−N−1) during a first time (T0-T1) from an external source and coupled to receive a second plurality of signals (rj(i+τj), i=N−2N−1) during a second time (T1-T2) from the external source. The input circuit receives each of the first and second plurality of signals along respective first and second paths (j). The input circuit produces a first input signal (Rj 1) and a second input signal (Rj 2) from the respective first and second plurality of signals. A correction circuit is coupled to receive a first estimate signal (αj 1), a second estimate signal (αj 2) and the first and second input signals. The correction circuit produces a first symbol estimate ({overscore (S)}1) in response to the first and second estimate signals and the first and second input signals. The correction circuit produces a second symbol estimate ({overscore (S)}2) in response to the first and second estimate signals and the first and second input signals.
Description
- This invention relates to wideband code division multiple access (WCDMA) for a communication system and more particularly to space time block coded transmit antenna diversity for WCDMA.
- Present code division multiple access (CDMA) systems are characterized by simultaneous transmission of different data signals over a common channel by assigning each signal a unique code. This unique code is matched with a code of a selected receiver to determine the proper recipient of a data signal. These different data signals arrive at the receiver via multiple paths due to ground clutter A and unpredictable signal reflection. Additive effects of these multiple data signals at the receiver may result in significant fading or variation in received signal strength. In general, this fading due to multiple data paths may be diminished by spreading the transmitted energy over a wide bandwidth. This wide bandwidth results in greatly reduced fading compared to narrow band transmission modes such as frequency division multiple access (FDMA) or time division multiple access (TDMA).
- New standards are continually emerging for next generation wideband code division multiple access (WCDMA) communication systems as described in Provisional U.S. Patent Application Ser. No. 60/082,671, filed Apr. 22, 1998, and incorporated herein by reference. These WCDMA systems are coherent communications systems with pilot symbol assisted channel estimation schemes. The pilot symbols are transmitted as quadrature phase shift keyed (QPSK) known data in predetermined time frames to any receivers within range. The frames may propagate in a discontinuous transmission (DTX) mode. For voice traffic, transmission of user data occurs when the user speaks, but no data symbol transmission occurs when the user is silent. Similarly for packet data, the user data may be transmitted only when packets are ready to be sent. The frames include pilot symbols as well as other control symbols such as transmit power control (TPC) symbols and rate information (RI) symbols. These control symbols include multiple bits otherwise known as chips to distinguish them from data bits. The chip transmission time (TC), therefore, is equal to the symbol time rate (T) divided by the number of chips in the symbol (N).
- Previous studies have shown that multiple transmit antennas may improve reception by increasing transmit diversity for narrow band communication systems. In their paperNew Detection Schemes for Transmit Diversity with no Channel Estimation, Tarokh et al. describe such a transmit diversity scheme for a TDMA system. The same concept is described in A Simple Transmitter Diversity Technique for Wireless Communications by Alamouti. Tarokh et al. and Alamouti, however, fail to teach such a transmit diversity scheme for a WCDMA communication system.
- Other studies have investigated open loop transmit diversity schemes such as orthogonal transmit diversity (OTD) and time switched time diversity (TSTD) for WCDMA systems. Both OTD and TSTD systems have similar performance. Both use multiple transmit antennas to provide some diversity against fading, particularly at low Doppler rates and when there are insufficient paths for the rake receiver. Both OTD and TSTD systems, however, fail to exploit the extra path diversity that is possible for open loop systems. For example, the OTD encoder circuit of FIG. 5 receives symbols S1 and S2 on
lead 500 and produces output signals onleads lead 600 is multiplied by a channel orthogonal code signal Cm(i+τj) that is unique to the receiver atlead 604. Each chip signal is summed over a respective symbol time bycircuit 608 and produced as first and second output signals Rj 1 and Rj 2 onleads Delay circuit 610 provides a one-symbol delay T so that the output signals are produced simultaneously. -
- Equations [3-4] show that the OTD method provides a single channel estimate α for each path j. A similar analysis for the TSTD system yields the same result. The OTD and TSTD methods, therefore, are limited to a path diversity of L. This path diversity limitation fails to exploit the extra path diversity that is possible for open loop systems as will be explained in detail.
- These problems are resolved by a mobile communication system comprising an input circuit coupled to receive a first plurality of signals during a first time from an external source and coupled to receive a second plurality of signals during a second time from the external source. The input circuit receives each of the first and second plurality of signals along respective first and second paths. The input circuit produces a first input signal and a second input signal from the respective first and second plurality of signals. A correction circuit is coupled to receive a first estimate signal, a second estimate signal and the first and second input signals. The correction circuit produces a first symbol estimate in response to the first and second estimate signals and the first and second input signals. The correction circuit produces a second symbol estimate in response to the first and second estimate signals and the first and second input signals.
- The present invention improves reception by providing at least 2L diversity over time and space. No additional transmit power or bandwidth is required. Power is balanced across multiple antennas.
- A more complete understanding of the invention may be gained by reading the subsequent detailed description with reference to the drawings wherein:
- FIG. 1 is a simplified block diagram of a typical transmitter using Space Time Transit Diversity (STTD) of the present invention;
- FIG. 2 is a block diagram showing signal flow in an STTD encoder of the present invention that may be used with the transmitter of FIG. 1;
- FIG. 3 is a schematic diagram of a phase correction circuit of the present invention that may be used with a receiver;
- FIG. 4A is a simulation showing STTD performance compared to Time Switched Time Diversity (TSTD) for a vehicular rate of 3 kmph;
- FIG. 4B is a simulation showing STTD performance compared to TSTD for a vehicular rate of 120 kmph;
- FIG. 5 is a block diagram showing signal flow in an OTD encoder of the prior art;
- FIG. 6 is a block diagram of a despreader input circuit of the prior art; and
- FIG. 7 is a schematic diagram of a phase correction circuit of the prior art.
- Referring to FIG. 1, there is a simplified block diagram of a typical transmitter using Space Time Transit Diversity (STTD) of the present invention. The transmitter circuit receives pilot symbols, TPC symbols, RI symbols and data symbols on
leads multiplex circuit 120. Themultiplex circuit 120 produces each encoded symbol in a respective symbol time of a frame. Thus, a serial sequence of symbols in each frame is simultaneously applied to eachrespective multiplier circuit antennas - Turning now to FIG. 2, there is a block diagram showing signal flow in an STTD encoder of the present invention that may be used with the transmitter of FIG. 1. The STTD encoder receives symbol S1 at symbol time T and symbol S2 at
symbol time 2T onlead 200. The STTD encoder produces symbol S1 onlead 204 and symbol −S2* onlead 206 at symbol time T, where the asterisk indicates a complex conjugate operation. Furthermore, the symbol time indicates a relative position within a transmit frame and not an absolute time. The STTD encoder then produces symbol S1 onlead 204 and symbol S1* onlead 206 atsymbol time 2T. The bit or chip signals of these symbols are transmitted serially alongrespective paths leads first antenna 204 along the jth path. Likewise, a Rayleigh fading parameter αj 2 is assumed for a signal transmitted from thesecond antenna 206 along the jth path. Each ith chip or bit signal rj(i+τj) of a respective symbol is subsequently received at a remotemobile antenna 212 after a transmit time τj corresponding to the jth path. The signals propagate to a despreader input circuit (FIG. 6) where they are summed over each respective symbol time to produce output signals Rj 1 and Rj 2 corresponding to the jth of L multiple signal paths as previously described. -
- The phase correction circuit receives a complex conjugate of a channel estimate of a Rayleigh fading parameter αj 1*, corresponding to the first antenna on
lead 302 and a channel estimate of another Rayleigh fading parameter αj 2 corresponding to the second antenna onlead 306. Complex conjugates of the input signals are produced bycircuits leads - R j 1αj 1 *+R j 2*αj 2=(|αj 1|2+|αj 2|2)S 1 [7]
- −R j 1*αj 2 +R j 2αj 1*=(|αj 1|2+|αj 2|2)S 2 [8]
-
- These soft symbols or estimates provide a path diversity L and a transmit
diversity 2. Thus, the total diversity of the STTD system is 2L. This increased diversity is highly advantageous in providing a reduced bit error rate. The simulation result of FIG. 4 compares a bit error rate (BER) of STTD with TSTD for various ratios of energy per bit (Eb) to noise (No) at a relative speed of 3 Kmph. The OTD and TSTD systems were found to be the same in other simulations. The simulation shows that a 7.5 dB ratio Eb/No corresponds to a BER of 2.0E-3 for TSTD. The same BER, however, is achieved with a 7.2 dB ratio Eb/No. Thus, STTD produces approximately 0.3 dB improvement over TSTD. The simulation of FIG. 5 compares the BER of STTD with TSTD for various values of Eb/No at a relative speed of 120 Kmph. This simulation shows a typical 0.25 dB improvement for STTD over TSTD even for high Doppler rates. By way of comparison, STTD demonstrates a 1.0 dB advantage over the simulated curve of FIG. 5 without diversity at a BER of 2.6E-3. This substantial advantage further demonstrates the effectiveness of the present invention. - Although the invention has been described in detail with reference to its preferred embodiment, it is to be understood that this description is by way of example only and is not to be construed in a limiting sense. For example, several variations in the order of symbol transmission would provide the same 2L diversity. Moreover, the exemplary diversity of the present invention may be increased with a greater number of transmit or receive antennas. Furthermore, novel concepts of the present invention are not limited to exemplary circuitry, but may also be realized by digital signal processing as will be appreciated by those of ordinary skill in the art with access to the instant specification.
- It is to be further understood that numerous changes in the details of the embodiments of the invention will be apparent to persons of ordinary skill in the art having reference to this description. It is contemplated that such changes and additional embodiments are within the spirit and true scope of the invention as claimed below.
Claims (22)
1. A circuit, comprising:
a correction circuit coupled to receive a first estimate signal, a second estimate signal, a first input signal and a second input signal, the correction circuit receiving the first and second input signals from an external source along a respective signal path of a plurality of signal paths, the correction circuit producing a first symbol estimate in response to the first and second estimate signals and the first and second input signals, the correction circuit producing a second symbol estimate in response to the first and second estimate signals and the first and second input signals; and
a combining circuit coupled to receive a plurality of first symbol estimates including the first symbol estimate and coupled to receive a plurality of second symbol estimates including the second symbol estimate, the combining circuit producing a first symbol signal in response to the plurality of first symbol estimates and producing a second symbol signal in response to the plurality of second symbol estimates.
2. A circuit as in claim 1 , further comprising an input circuit coupled to receive a first plurality of signals during a first time from the external source and coupled to receive a second plurality of signals during a second time from the external source, the input circuit receiving each of the first and second plurality of signals along respective first and second paths, the input circuit producing the first input signal and the second input signal from the respective first and second plurality of signals.
3. A circuit as in claim 1 , further comprising an input circuit coupled to receive a plurality of signals from an external source along a plurality of signal paths, the input circuit producing a plurality of input signals including the first input signal and the second input signal corresponding to a respective signal path of the plurality of signal paths.
4. A circuit as in claim 1 , wherein the correction circuit and the combining circuit are formed on a single integrated circuit.
5. A circuit as in claim 1 , wherein each of the first and second symbol signals include at least one of a pilot symbol, a transmit power control symbol, a rate information symbol and a data symbol.
6. A circuit as in claim 1 , wherein the first time corresponds to a transmission time of one of the first and second symbol signals and wherein the second time corresponds to a transmission time of the other of the first and second symbol signals.
7. A circuit as in claim 1 , wherein a total path diversity of each of the first and second symbol signals is at least twice a number of transmitting antennas.
8. A circuit as in claim 1 , wherein the first input signal is transmitted by a first antenna and a second antenna and wherein the second input signal is transmitted by the first antenna and the second antenna.
9. A circuit as in claim 8 , wherein the first and the second input signal are wideband code division multiple access signals.
10. A circuit as in claim 9 , wherein a total path diversity of each of the first and second symbol signals is at least twice a number of transmitting antennas.
11. A method of processing signals in a communication circuit, comprising the steps of:
receiving a plurality of first signals during a first time, each first signal corresponding to a respective signal path;
receiving a plurality of second signals during a second time;
estimating a first Rayleigh fading parameter;
estimating a second Rayleigh fading parameter;
producing a first symbol signal in response to said plurality of first signals, said plurality of second signals and said first and second Rayleigh fading parameters; and
producing a second symbol signal in response to said plurality of first signals, said plurality of second signals and said first and second Rayleigh fading parameters.
12. A method of processing signals as in claim 11 , further comprising the steps of:
determining a conjugate of said each first signal;
determining a conjugate of each second signal of said plurality of second signals;
determining a conjugate of each said first Rayleigh fading parameter; and
determining a conjugate of each said second Rayleigh fading parameter.
13. A method of processing signals as in claim 12 , further comprising the steps of:
determining an approximate said first symbol by adding a product of said each first signal and each respective said conjugate of each said first Rayleigh fading parameter to a product of said conjugate of said each second signal and each respective said second Rayleigh fading parameter; and
determining an approximate said second symbol by adding a product of a complement of said conjugate of said each first signal and each respective second Rayleigh fading parameter to a product of said each second signal and each respective said conjugate of each said second Rayleigh fading parameter.
14. A mobile communication system, comprising:
a mobile antenna arranged to receive a plurality of signals from an external source along a respective plurality of signal paths;
an input circuit coupled to receive the plurality of signals from the antenna, the input circuit producing a plurality of input signals including a first input signal and a second input signal corresponding to respective signal paths of the plurality of signal paths; and
a correction circuit coupled to receive a first estimate signal, a second estimate signal and the first and second input signals, the correction circuit producing a first symbol estimate in response to the first and second estimate signals and the first and second input signals, the correction circuit producing a second symbol estimate in response to the first and second estimate signals and the first and second input signals.
15. A mobile communication system as in claim 14 , further comprising a combining circuit coupled to receive a plurality of first symbol estimates including the first symbol estimate and coupled to receive a plurality of second symbol estimates including the second symbol estimate, the combining circuit producing a first symbol signal in response to the plurality of first symbol estimates and producing a second symbol signal in response to the plurality of second symbol estimates.
16. A mobile communication system as in claim 15 , wherein the input circuit, the correction circuit and the combining circuit are formed on a single integrated circuit.
17. A mobile communication system as in claim 15 , wherein each of the first and second symbol signals include at least one of a pilot symbol, a transmit power control symbol, a rate information symbol and a data symbol.
18. A mobile communication system as in claim 14 , wherein each of the first and second estimate signals is a Rayleigh fading parameter estimate.
19. A mobile communication system as in claim 14 , wherein a total path diversity of each of the first and second symbol signals is at least twice a number of transmitting antennas.
20. A mobile communication system as in claim 14 , wherein each of the first and second input signals is transmitted by a first antenna and a second antenna.
21. A mobile communication system as in claim 20 , wherein each of the first and second input signals is a wideband code division multiple access signal.
22. A mobile communication system as in claim 21 , wherein a total path diversity of each of the first and second symbol signals is at least twice a number of transmitting antennas.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/941,286 US6424679B1 (en) | 1998-10-07 | 2001-08-28 | Space time block coded transmit antenna diversity for WCDMA |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10344398P | 1998-10-07 | 1998-10-07 | |
US09/205,029 US6643338B1 (en) | 1998-10-07 | 1998-12-03 | Space time block coded transmit antenna diversity for WCDMA |
US09/941,286 US6424679B1 (en) | 1998-10-07 | 2001-08-28 | Space time block coded transmit antenna diversity for WCDMA |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/205,029 Division US6643338B1 (en) | 1998-10-07 | 1998-12-03 | Space time block coded transmit antenna diversity for WCDMA |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020090038A1 true US20020090038A1 (en) | 2002-07-11 |
US6424679B1 US6424679B1 (en) | 2002-07-23 |
Family
ID=26800468
Family Applications (7)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/205,029 Expired - Lifetime US6643338B1 (en) | 1998-10-07 | 1998-12-03 | Space time block coded transmit antenna diversity for WCDMA |
US09/941,286 Expired - Lifetime US6424679B1 (en) | 1998-10-07 | 2001-08-28 | Space time block coded transmit antenna diversity for WCDMA |
US09/941,285 Expired - Lifetime US6449314B1 (en) | 1998-10-07 | 2001-08-28 | Space time block coded transmit antenna diversity for WCDMA |
US10/202,743 Expired - Lifetime US7200182B2 (en) | 1998-10-07 | 2002-07-25 | Space time block coded transmit antenna diversity for WCDMA |
US10/601,866 Expired - Fee Related US7613259B2 (en) | 1998-10-07 | 2003-06-23 | Mobile receiver phase correction circuit |
US10/659,906 Expired - Fee Related US7366266B2 (en) | 1998-10-07 | 2003-09-11 | Space time block coded transmit antenna diversity for WCDMA |
US12/565,443 Expired - Fee Related US8107570B2 (en) | 1998-10-07 | 2009-09-23 | Space time block coded transmit antenna diversity for WCDMA |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/205,029 Expired - Lifetime US6643338B1 (en) | 1998-10-07 | 1998-12-03 | Space time block coded transmit antenna diversity for WCDMA |
Family Applications After (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/941,285 Expired - Lifetime US6449314B1 (en) | 1998-10-07 | 2001-08-28 | Space time block coded transmit antenna diversity for WCDMA |
US10/202,743 Expired - Lifetime US7200182B2 (en) | 1998-10-07 | 2002-07-25 | Space time block coded transmit antenna diversity for WCDMA |
US10/601,866 Expired - Fee Related US7613259B2 (en) | 1998-10-07 | 2003-06-23 | Mobile receiver phase correction circuit |
US10/659,906 Expired - Fee Related US7366266B2 (en) | 1998-10-07 | 2003-09-11 | Space time block coded transmit antenna diversity for WCDMA |
US12/565,443 Expired - Fee Related US8107570B2 (en) | 1998-10-07 | 2009-09-23 | Space time block coded transmit antenna diversity for WCDMA |
Country Status (4)
Country | Link |
---|---|
US (7) | US6643338B1 (en) |
EP (1) | EP0993130B1 (en) |
JP (1) | JP4421030B2 (en) |
KR (5) | KR20000028887A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020075832A1 (en) * | 2000-12-07 | 2002-06-20 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20050181736A1 (en) * | 2002-03-22 | 2005-08-18 | Aijun Cao | Self & minus; adaptive weighted space time transmitting diversity method and system thereof |
WO2007138516A1 (en) * | 2006-05-29 | 2007-12-06 | Nxp B.V. | Low-cost and low-complexity inner communication receiver for receive diversity |
Families Citing this family (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7088785B2 (en) * | 1998-12-31 | 2006-08-08 | Texas Instruments Incorporated | Block level space time transmit diversity in wireless communications |
US6452916B1 (en) * | 1999-01-04 | 2002-09-17 | Lucent Technologies Inc. | Space-time spreading method of CDMA wireless communication |
US7864902B1 (en) * | 2003-04-28 | 2011-01-04 | At&T Corp. | Differential transmitter diversity technique for wireless communications |
US6728302B1 (en) * | 1999-02-12 | 2004-04-27 | Texas Instruments Incorporated | STTD encoding for PCCPCH |
US6775260B1 (en) * | 1999-02-25 | 2004-08-10 | Texas Instruments Incorporated | Space time transmit diversity for TDD/WCDMA systems |
US6515978B1 (en) * | 1999-04-19 | 2003-02-04 | Lucent Technologies Inc. | Methods and apparatus for downlink diversity in CDMA using Walsh codes |
US6891903B2 (en) * | 1999-04-22 | 2005-05-10 | At&T Corp. | Multiple transmit antenna differential detection from generalized orthogonal designs |
US6594473B1 (en) * | 1999-05-28 | 2003-07-15 | Texas Instruments Incorporated | Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities |
US7149253B2 (en) * | 2000-03-21 | 2006-12-12 | Texas Instruments Incorporated | Wireless communication |
JP2001267982A (en) * | 2000-03-22 | 2001-09-28 | Matsushita Electric Ind Co Ltd | Sttd encoding method and diversity transmitter |
US7272192B2 (en) * | 2000-04-14 | 2007-09-18 | Board Of Trustees Of The Leland Stanford Junior University | Time-reversal block transmit diversity system for channels with intersymbol interference and method |
US6539209B1 (en) * | 2000-05-30 | 2003-03-25 | Lucent Technologies Inc. | Code-division, multiple-access base station having transmit diversity |
US7154958B2 (en) * | 2000-07-05 | 2006-12-26 | Texas Instruments Incorporated | Code division multiple access wireless system with time reversed space time block transmitter diversity |
EP2262151B1 (en) | 2000-07-05 | 2017-10-04 | Sony Deutschland Gmbh | Pilot pattern design for multiple antennas in an OFDM system |
GB0016663D0 (en) * | 2000-07-06 | 2000-08-23 | Nokia Networks Oy | Receiver and method of receiving |
US6687295B1 (en) * | 2000-07-27 | 2004-02-03 | Ati International | Method and apparatus for motion estimation for encoding sequential frames |
KR100526499B1 (en) * | 2000-08-22 | 2005-11-08 | 삼성전자주식회사 | Apparatus for transmit diversity for more than two antennas and method thereof |
US7065156B1 (en) * | 2000-08-31 | 2006-06-20 | Nokia Mobile Phones Ltd. | Hopped delay diversity for multiple antenna transmission |
AU2001230641A1 (en) | 2000-10-27 | 2002-05-06 | Nortel Networks Limited | Combination of space-time coding and spatial multiplexing, and the use of orthogonal transformation in space-time coding |
KR100743361B1 (en) * | 2001-01-12 | 2007-07-26 | 주식회사 케이티 | A Transmitting and Receiving Method using the Multi-Carrier Transmit Diversity based on Space Time SpreadingSTS for Mobile Communication Systems |
GB2399998B (en) * | 2001-02-01 | 2005-04-13 | Fujitsu Ltd | Communications systems |
JP2005503045A (en) * | 2001-03-28 | 2005-01-27 | ノキア コーポレイション | Non-zero complex weighted space-time code for multi-antenna transmission |
US6959047B1 (en) * | 2001-04-09 | 2005-10-25 | At&T Corp | Training-based channel estimation for multiple-antennas |
US7471734B2 (en) * | 2001-04-26 | 2008-12-30 | Motorola, Inc. | Space-time transmit diversity scheme for time-dispersive propagation media |
US6920314B2 (en) * | 2001-07-30 | 2005-07-19 | Lucent Technologies Inc. | Symmetric sweep phase sweep transmit diversity |
US20030108087A1 (en) * | 2001-12-06 | 2003-06-12 | Itzhak Shperling | Method and base station for providing transmit diversity |
US7099644B2 (en) * | 2001-12-28 | 2006-08-29 | Visteon Global Technologies, Inc. | Beamsteering control system for a vehicle radio receiver |
US7577085B1 (en) | 2002-06-03 | 2009-08-18 | Marvell International Ltd. | Multicarrier transmit diversity |
KR100469426B1 (en) * | 2002-06-21 | 2005-02-02 | 엘지전자 주식회사 | Method and apparatus for pilot signal transmission and reception |
US7272108B2 (en) * | 2002-08-01 | 2007-09-18 | Mediatek, Inc. | Channel estimation in orthogonal frequency-division multiplexing (OFDM) systems |
US6765888B2 (en) | 2002-08-23 | 2004-07-20 | Motorola, Inc. | Control PDU for early target paging for packet data modes |
US7397864B2 (en) * | 2002-09-20 | 2008-07-08 | Nortel Networks Limited | Incremental redundancy with space-time codes |
US7254196B2 (en) * | 2002-11-26 | 2007-08-07 | Agere Systems Inc. | Symbol timing for MIMO OFDM and other wireless communication systems |
CN100426707C (en) * | 2003-01-03 | 2008-10-15 | 华为技术有限公司 | Method for processing feedback signal in closed-loop transmitting diversity system and its device |
CN100454795C (en) * | 2003-01-03 | 2009-01-21 | 华为技术有限公司 | Adaptive space time closed-loop transmitting diversity method and its system |
KR20050069802A (en) * | 2003-12-31 | 2005-07-05 | 엘지전자 주식회사 | Method and system for complex transmit diversity |
US20060008021A1 (en) * | 2004-06-30 | 2006-01-12 | Nokia Corporation | Reduction of self-interference for a high symbol rate non-orthogonal matrix modulation |
WO2006070750A1 (en) * | 2004-12-27 | 2006-07-06 | Matsushita Electric Industrial Co., Ltd. | Radio transmitting apparatus, radio receiving apparatus, radio transmitting method and radio receiving method |
US8811273B2 (en) * | 2005-02-22 | 2014-08-19 | Texas Instruments Incorporated | Turbo HSDPA system |
DE102005017080B4 (en) * | 2005-04-08 | 2007-07-26 | Accelant Communications Gmbh | Transmission method in a radio system with multiple transmission / reception branches in the base station |
KR100704676B1 (en) * | 2005-06-24 | 2007-04-06 | 한국전자통신연구원 | Diversity Method and Base-Station for Controlling Power Allocation of Transmit Antenna in Mobile Communication System |
KR101276797B1 (en) * | 2005-08-24 | 2013-06-20 | 한국전자통신연구원 | Base station tranmitter for mobile telecommunication system, method for that system |
KR20080082661A (en) * | 2006-01-12 | 2008-09-11 | 노키아 코포레이션 | Pilot scrambling in communications systems |
US20080080434A1 (en) * | 2006-09-28 | 2008-04-03 | Guy Wolf | Method and apparatus of system scheduler |
FR2919132B1 (en) * | 2007-07-20 | 2011-04-29 | Eads Secure Networks | SIGNAL TRANSMISSION BY MULTIPLE ANTENNAS |
BRPI0703586B1 (en) * | 2007-10-19 | 2018-02-06 | Braskem S.A | SUPPORTED METALOCENE CATALYST, AND HIGH AND ULTRA HIGH MOLECULAR ALPHA ETHYLENE COPOLYMERS |
JP4898727B2 (en) * | 2008-03-17 | 2012-03-21 | パナソニック株式会社 | TRANSMISSION DEVICE, RECEPTION DEVICE, TRANSMISSION METHOD, AND RECEPTION METHOD |
EP2717168B1 (en) * | 2012-10-05 | 2017-08-09 | General Electric Technology GmbH | Networks and method for reliable transfer of information between industrial systems |
CN107294581A (en) * | 2016-03-30 | 2017-10-24 | 景略半导体(上海)有限公司 | Multi-antenna transmission, single antenna reception, multi-aerial transmission system and method |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140615A (en) * | 1990-06-12 | 1992-08-18 | Motorola, Inc. | Maximal ratio diversity combining technique |
US5214675A (en) * | 1991-07-02 | 1993-05-25 | Motorola, Inc. | System and method for calculating channel gain and noise variance of a communication channel |
US5228054A (en) | 1992-04-03 | 1993-07-13 | Qualcomm Incorporated | Power-of-two length pseudo-noise sequence generator with fast offset adjustment |
US5305353A (en) * | 1992-05-29 | 1994-04-19 | At&T Bell Laboratories | Method and apparatus for providing time diversity |
US5537444A (en) * | 1993-01-14 | 1996-07-16 | At&T Corp. | Extended list output and soft symbol output viterbi algorithms |
US5329547A (en) * | 1993-03-11 | 1994-07-12 | Motorola, Inc. | Method and apparatus for coherent communication in a spread-spectrum communication system |
US5581580A (en) * | 1993-05-20 | 1996-12-03 | Telefonaktiebolaget Lm Ericsson | Low complexity model based channel estimation algorithm for fading channels |
CA2124709C (en) * | 1993-08-24 | 1998-06-09 | Lee-Fang Wei | Reduced speed equalizer |
US5442626A (en) * | 1993-08-24 | 1995-08-15 | At&T Corp. | Digital communications system with symbol multiplexers |
US5592492A (en) * | 1994-05-13 | 1997-01-07 | Lsi Logic Corporation | Convolutional interleaving/de-interleaving method and apparatus for data transmission |
US6137843A (en) * | 1995-02-24 | 2000-10-24 | Ericsson Inc. | Methods and apparatus for canceling adjacent channel signals in digital communications systems |
US5848103A (en) * | 1995-10-04 | 1998-12-08 | Lucent Technologies Inc. | Method and apparatus for providing time diversity |
US5737327A (en) * | 1996-03-29 | 1998-04-07 | Motorola, Inc. | Method and apparatus for demodulation and power control bit detection in a spread spectrum communication system |
US6158258A (en) * | 1996-06-21 | 2000-12-12 | Bowman; David Alan | Rinsing system |
US5912931A (en) * | 1996-08-01 | 1999-06-15 | Nextel Communications | Method for multicarrier signal detection and parameter estimation in mobile radio communication channels |
US6185258B1 (en) * | 1997-09-16 | 2001-02-06 | At&T Wireless Services Inc. | Transmitter diversity technique for wireless communications |
EP1808969B1 (en) * | 1997-10-31 | 2014-01-01 | AT & T Mobility II, LLC | Maximum likehood detection of concatenated space-time codes for wireless applications with transmitter diversity |
KR100778647B1 (en) | 1998-09-04 | 2007-11-22 | 에이티 앤드 티 코포레이션 | Combined channel coding and space-block coding in a multi-antenna arrangement |
-
1998
- 1998-12-03 US US09/205,029 patent/US6643338B1/en not_active Expired - Lifetime
-
1999
- 1999-10-07 JP JP28735899A patent/JP4421030B2/en not_active Expired - Lifetime
- 1999-10-07 KR KR1019990043165A patent/KR20000028887A/en not_active Application Discontinuation
- 1999-10-07 EP EP99203293.8A patent/EP0993130B1/en not_active Expired - Lifetime
-
2001
- 2001-08-28 US US09/941,286 patent/US6424679B1/en not_active Expired - Lifetime
- 2001-08-28 US US09/941,285 patent/US6449314B1/en not_active Expired - Lifetime
-
2002
- 2002-07-25 US US10/202,743 patent/US7200182B2/en not_active Expired - Lifetime
-
2003
- 2003-06-23 US US10/601,866 patent/US7613259B2/en not_active Expired - Fee Related
- 2003-09-11 US US10/659,906 patent/US7366266B2/en not_active Expired - Fee Related
-
2007
- 2007-07-26 KR KR1020070075111A patent/KR20070081130A/en not_active Application Discontinuation
-
2008
- 2008-09-19 KR KR1020080092354A patent/KR20080088567A/en not_active Application Discontinuation
-
2009
- 2009-04-27 KR KR1020090036746A patent/KR20090048427A/en not_active Application Discontinuation
- 2009-04-27 KR KR1020090036728A patent/KR100965735B1/en active IP Right Grant
- 2009-09-23 US US12/565,443 patent/US8107570B2/en not_active Expired - Fee Related
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020110108A1 (en) * | 2000-12-07 | 2002-08-15 | Younglok Kim | Simple block space time transmit diversity using multiple spreading codes |
US20020075832A1 (en) * | 2000-12-07 | 2002-06-20 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20020089955A1 (en) * | 2000-12-07 | 2002-07-11 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20020089953A1 (en) * | 2000-12-07 | 2002-07-11 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20020093927A1 (en) * | 2000-12-07 | 2002-07-18 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20020097699A1 (en) * | 2000-12-07 | 2002-07-25 | Interdigital Technology Corporation | Transmit diversity using multiple spreading codes |
US20020080746A1 (en) * | 2000-12-07 | 2002-06-27 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US8311492B2 (en) * | 2000-12-07 | 2012-11-13 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US20100074242A1 (en) * | 2000-12-07 | 2010-03-25 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
US7444161B2 (en) | 2002-03-22 | 2008-10-28 | Huawei Technologies Co., Ltd. | Self & minus; adaptive weighted space time transmitting diversity method and system thereof |
US20050181736A1 (en) * | 2002-03-22 | 2005-08-18 | Aijun Cao | Self & minus; adaptive weighted space time transmitting diversity method and system thereof |
WO2007138516A1 (en) * | 2006-05-29 | 2007-12-06 | Nxp B.V. | Low-cost and low-complexity inner communication receiver for receive diversity |
US20090238247A1 (en) * | 2006-05-29 | 2009-09-24 | Nxp B.V. | Low-cost and low-complexity inner communication receiver for receive diversity |
US8374220B2 (en) | 2006-05-29 | 2013-02-12 | St-Ericsson Sa | Low-cost and low-complexity inner communication receiver for receive diversity |
Also Published As
Publication number | Publication date |
---|---|
US6449314B1 (en) | 2002-09-10 |
US7200182B2 (en) | 2007-04-03 |
US6424679B1 (en) | 2002-07-23 |
US7366266B2 (en) | 2008-04-29 |
US20050111597A1 (en) | 2005-05-26 |
JP4421030B2 (en) | 2010-02-24 |
KR100965735B1 (en) | 2010-06-24 |
US6643338B1 (en) | 2003-11-04 |
US20020080894A1 (en) | 2002-06-27 |
KR20090048426A (en) | 2009-05-13 |
EP0993130A3 (en) | 2004-05-06 |
US7613259B2 (en) | 2009-11-03 |
US20020191704A1 (en) | 2002-12-19 |
KR20080088567A (en) | 2008-10-02 |
KR20070081130A (en) | 2007-08-14 |
KR20000028887A (en) | 2000-05-25 |
KR20090048427A (en) | 2009-05-13 |
US20100014619A1 (en) | 2010-01-21 |
EP0993130A2 (en) | 2000-04-12 |
US8107570B2 (en) | 2012-01-31 |
JP2000138623A (en) | 2000-05-16 |
EP0993130B1 (en) | 2016-09-28 |
US20040086065A1 (en) | 2004-05-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7613259B2 (en) | Mobile receiver phase correction circuit | |
US6356605B1 (en) | Frame synchronization in space time block coded transmit antenna diversity for WCDMA | |
USRE42919E1 (en) | Power control with space time transmit diversity | |
US6424642B1 (en) | Estimation of doppler frequency through autocorrelation of pilot symbols | |
US6804311B1 (en) | Diversity detection for WCDMA | |
US6775260B1 (en) | Space time transmit diversity for TDD/WCDMA systems | |
US6724828B1 (en) | Mobile switching between STTD and non-diversity mode | |
JP2001044900A (en) | Radio system provided with plural transmission antennas for connecting open loop and closed loop transmission diversities | |
EP0993129B1 (en) | Channel estimation in space time block coded transmit antenna diversity for WCDMA | |
JP2000201102A5 (en) | ||
EP1039658A2 (en) | Method of operating a communication circuit | |
EP1056237A2 (en) | Diversity detection for WCDMA |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: INTEL CORPORATION, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TEXAS INSTRUMENTS INCORPORATED;REEL/FRAME:041383/0040 Effective date: 20161223 |