WO2011037931A2 - Interference cancellation for wireless communications - Google Patents
Interference cancellation for wireless communications Download PDFInfo
- Publication number
- WO2011037931A2 WO2011037931A2 PCT/US2010/049690 US2010049690W WO2011037931A2 WO 2011037931 A2 WO2011037931 A2 WO 2011037931A2 US 2010049690 W US2010049690 W US 2010049690W WO 2011037931 A2 WO2011037931 A2 WO 2011037931A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel
- frame
- power control
- composite signal
- user
- Prior art date
Links
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Classifications
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- 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
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
-
- 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
-
- 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
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
-
- 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
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
- H04B1/71072—Successive interference cancellation
-
- 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
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
-
- 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
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
-
- 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
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
-
- 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
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power 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
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/362—Aspects of the step size
-
- 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
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
Definitions
- Yet another aspect of the present disclosure provides an apparatus for processing a composite signal, the composite signal comprising at least a first channel and a second channel overlapping in time with the first channel, the apparatus comprising: a demodulator for demodulating an entire frame of the second channel; a decoder for decoding the first channel to generate decoded symbols after the entire frame of the second channel is demodulated; an interference reconstruction block for, if the first channel is successfully decoded, generating an expected receive signal for the first channel based on the decoded symbols; a cancellation block for cancelling the expected receive signal from the composite signal to generate a processed composite signal, the decoder further configured to decode the frame of the second channel based on the processed composite signal.
- a decode attempt after receiving PCG #7 results in a successful decode, whereupon the data bits d(t) corresponding to the entire frame are known by the BS.
- both backward IC 610a and forward IC 610b may be performed according to the present disclosure.
- first-pass pilot estimation is performed for a plurality of users 1 through N.
- Techniques for first-pass pilot estimation are well-known in the art, and are further described in, e.g., U.S. Pat. App. Ser. No. 12/484,572, earlier referenced herein.
- a group of undecoded users G is selected.
- TIC is performed for successfully decoded users by
- a channel for user 1 is re-estimated prior to performing channel demodulation for that user.
- a "re-estimated channel” may be more accurate than a channel estimate based on a first-pass pilot estimate for that user due to, e.g., the first-pass PIC performed at block 1306 for all users.
- the re- estimated channel for subsequent users e.g., performed at a corresponding block 1308 in a block 1307./? (not shown) for a user n, may benefit from the interference cancellation already performed on previous users 1 through n- ⁇ .
- the W-CDMA standard defines two Gold code sequences for scrambling the downlink, one for the in-phase component (I) and another for the quadrature (Q).
- the I and Q PN sequences together are broadcast throughout the cell without data modulation. This broadcast is referred to as the common pilot channel (CPICH).
- CPICH common pilot channel
- the PN sequences generated are truncated to a length of 38,400 chips. A period of 38,400 chips is referred to as a radio frame. Each radio frame is divided into 15 equal sections referred to as slots.
- a base transceiver station 110, 111, 114 of an access network sends downlink payload data to user equipment devices 123-127 on High Speed Downlink Shared Channel (HS-DSCH), and the control information associated with the downlink data on High Speed Shared Control Channel (HS-SCCH).
- HS-DSCH High Speed Downlink Shared Channel
- HS-SCCH High Speed Shared Control Channel
- OVSF or Walsh Orthogonal Variable Spreading Factor
- MIMO In a MIMO system, there are N (# of transmitter antennas) by M (# of receiver antennas) signal paths from the transmit and the receive antennas, and the signals on these paths are not identical.
- MIMO creates multiple data transmission pipes.
- the pipes are orthogonal in the space-time domain.
- the number of pipes equals the rank of the system. Since these pipes are orthogonal in the space-time domain, they create little interference with each other.
- the data pipes are realized with proper digital signal processing by properly combining signals on the NxM paths. It is noted that a transmission pipe does not correspond to an antenna transmission chain or any one particular transmission path.
- an access terminal 123-127 may be any data device that communicates through a wireless channel or through a wired channel, for example using fiber optic or coaxial cables.
- An access terminal 123-127 may be any of a number of types of devices including but not limited to PC card, compact flash, external or internal modem, or wireless or wireline phone.
- the access terminal 123-127 is also known as user equipment (UE), a remote station, a mobile station or a subscriber station. Also, the UE 123-127 may be mobile or stationary.
- FIG 15C is detailed herein below, wherein specifically, a Node B 110, 111, 114 and radio network controller 141-144 interface with a packet network interface 146.
- the Node B 110, 111, 114 and radio network controller 141-144 may be part of a radio network server (RNS) 66, shown in FIG 15A and in FIG 15C as a dotted line surrounding one or more Node Bs 110, 111, 114 and the radio network controller 141-144.
- RNS radio network server
- PSTN Telephone Network
- PSTN 148 through a mobile switching center 151, 152.
- radio network controller 141-144 interfaces with Node Bs 110, 111, 114 in the communication system 100B.
- radio network controller 141-144 interfaces with a Packet Network Interface 146.
- Radio network controller 141-144 coordinates the communication between user equipment 123-127 in the communication system and other users connected to a packet network interface 146 and PSTN 148.
- PSTN 148 interfaces with users through a standard telephone network (not shown in FIG 15C).
- FIG 15D illustrates an embodiment of a user equipment (UE) 123-127 in which the UE 123-127 includes transmit circuitry 164 (including PA 108), receive circuitry 109, power controller 107, decode processor 158, processing unit 103, and memory 116.
- transmit circuitry 164 including PA 108
- receive circuitry 109 includes transmit circuitry 164 (including PA 108), receive circuitry 109, power controller 107, decode processor 158, processing unit 103, and memory 116.
- the processing unit 103 controls operation of the UE 123-127.
- the processing unit 103 may also be referred to as a CPU.
- Memory 116 which may include both read-only memory (ROM) and random access memory (RAM), provides instructions and data to the processing unit 103.
- a portion of the memory 116 may also include non- volatile random access memory (NVRAM).
- the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
- Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
- a storage media may be any available media that can be accessed by a computer.
- such computer- readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020137028477A KR101446886B1 (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for wireless communications |
EP10768306A EP2481178A2 (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for wireless communications |
CN201080050722.8A CN102823175B (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for radio communication |
JP2012530977A JP5456165B2 (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for wireless communications |
KR1020127010339A KR101446848B1 (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for wireless communications |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/564,607 | 2009-09-22 | ||
US12/564,607 US8611305B2 (en) | 2005-08-22 | 2009-09-22 | Interference cancellation for wireless communications |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2011037931A2 true WO2011037931A2 (en) | 2011-03-31 |
WO2011037931A3 WO2011037931A3 (en) | 2011-06-23 |
Family
ID=43618307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/049690 WO2011037931A2 (en) | 2009-09-22 | 2010-09-21 | Interference cancellation for wireless communications |
Country Status (6)
Country | Link |
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US (2) | US8611305B2 (en) |
EP (2) | EP2481178A2 (en) |
JP (1) | JP5456165B2 (en) |
KR (2) | KR101446886B1 (en) |
CN (1) | CN102823175B (en) |
WO (1) | WO2011037931A2 (en) |
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CN104081845A (en) * | 2012-12-25 | 2014-10-01 | 华为技术有限公司 | Data transmitting method, receiving method and device |
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US8611305B2 (en) | 2013-12-17 |
US20140187248A1 (en) | 2014-07-03 |
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