CA2650430A1 - Derivation and feedback of a transmit steering matrix - Google Patents

Derivation and feedback of a transmit steering matrix Download PDF

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Publication number
CA2650430A1
CA2650430A1 CA002650430A CA2650430A CA2650430A1 CA 2650430 A1 CA2650430 A1 CA 2650430A1 CA 002650430 A CA002650430 A CA 002650430A CA 2650430 A CA2650430 A CA 2650430A CA 2650430 A1 CA2650430 A1 CA 2650430A1
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CA
Canada
Prior art keywords
matrix
transmit steering
transformation
parameters
processor
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
Application number
CA002650430A
Other languages
French (fr)
Other versions
CA2650430C (en
Inventor
Steven J. Howard
John W. Ketchum
Mark S. Wallace
J. Rodney Walton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Incorporated
Steven J. Howard
John W. Ketchum
Mark S. Wallace
J. Rodney Walton
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of CA2650430A1 publication Critical patent/CA2650430A1/en
Application granted granted Critical
Publication of CA2650430C publication Critical patent/CA2650430C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • 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
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • H04L1/0675—Space-time coding characterised by the signaling

Abstract

Techniques for efficiently deriving a transmit steering matrix and sending feedback for this matrix are described. A receiver determines a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to the receiver. The receiver may derive the transmit steering matrix based on a set of transformation matrices, which may be used for multiple iterations of Jacobi rotation to zero out off-diagonal elements of a channel matrix. The receiver may then determine the set of parameters based on the transformation matrices. The set of parameters may comprise at least one angle, at least one value, at least one index, etc., for each transformation matrix. The receiver sends the set of parameters defining the transmit steering matrix (instead of elements of the transmit steering matrix) to the transmitter for use by the transmitter to derive the transmit steering matrix.

Claims (39)

1. An apparatus comprising:
at least one processor configured to determine a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to a receiver, and to send the set of parameters to the transmitter for use by the transmitter to derive the transmit steering matrix; and a memory coupled to the at least one processor.
2. The apparatus of claim 1, wherein the at least one processor is configured to derive the transmit steering matrix based on a plurality of transformation matrices, and to determine the set of parameters based on the plurality of transformation matrices.
3. The apparatus of claim 2, wherein the at least one processor is configured to perform a plurality of iterations of Jacobi rotation on a channel matrix with the plurality of transformation matrices to zero out off-diagonal elements of the channel matrix.
4. The apparatus of claim 3, wherein for each iteration of the Jacobi rotation the at least one processor is configured to derive a transformation matrix based on the channel matrix, to update the channel matrix based on the transformation matrix, and to update the transmit steering matrix based on the transformation matrix.
5. The apparatus of claim 4, wherein for each iteration of the Jacobi rotation, the at least one processor is configured to form a submatrix of the channel matrix, to decompose the submatrix to obtain an intermediate matrix of eigenvectors of the submatrix, and to form the transformation matrix based on the intermediate matrix.
6. The apparatus of claim 4, wherein for each iteration of the Jacobi rotation, the at least one processor is configured to identify a largest off-diagonal element of the channel matrix, and to derive the transformation matrix based on row and column indices of the largest off-diagonal element.
7. The apparatus of claim 4, wherein the at least one processor is configured to select elements of the channel matrix in a predetermined order for the plurality of iterations of the Jacobi rotation, and to derive the transformation matrix for each iteration of the Jacobi rotation based on elements of the channel matrix selected for the iteration.
8. The apparatus of claim 4, wherein the at least one processor is configured to initialize the transmit steering matrix to an identity matrix, a transmit steering matrix for another subcarrier, or a transmit steering matrix for another time interval prior to the plurality of iterations of the Jacobi rotation.
9. The apparatus of claim 4, wherein the at least one processor is configured to derive the channel matrix based on a channel response estimate.
10. The apparatus of claim 4, wherein the at least one processor is configured to derive a correlation matrix for a channel response matrix and to use the correlation matrix as the channel matrix.
11. The apparatus of claim 2, wherein the set of parameters comprises at least one angle for at least one element of each of the transformation matrices.
12. The apparatus of claim 11, wherein the at least one processor is configured to obtain the at least one angle for each transformation matrix with uniform quantization.
13. The apparatus of claim 11, wherein the at least one processor is configured to obtain the at least one angle for each transformation matrix with non-uniform quantization from CORDIC computation.
14. The apparatus of claim 2, wherein the set of parameters comprises at least one value for at least one element of each transformation matrix, at least one index for the at least one element of each transmit, an indication of a form of each transformation matrix, or a combination thereof.
15. A method comprising:
determining a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to a receiver; and sending the set of parameters to the transmitter for use by the transmitter to derive the transmit steering matrix.
16. The method of claim 15, wherein the determining the set of parameters comprises deriving the transmit steering matrix based on a plurality of transformation matrices, and determining the set of parameters based on the plurality of transformation matrices.
17. The method of claim 16, wherein the deriving the transmit steering matrix comprises performing a plurality of iterations of Jacobi rotation on a channel matrix with the plurality of transformation matrices, and for each iteration of the Jacobi rotation, deriving a transformation matrix based on the channel matrix, updating the channel matrix based on the transformation matrix, and updating the transmit steering matrix based on the transformation matrix.
18. The method of claim 16, wherein the determining the set of parameters based on the plurality of transformation matrices comprises forming the set of parameters with at least one angle for at least one element of each transformation matrix.
19. An apparatus comprising:

means for determining a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to a receiver; and means for sending the set of parameters to the transmitter for use by the transmitter to derive the transmit steering matrix.
20. The apparatus of claim 19, wherein the means for determining the set of parameters comprises means for deriving the transmit steering matrix based on a plurality of transformation matrices, and means for determining the set of parameters based on the plurality of transformation matrices.
21. The apparatus of claim 20, wherein the means for deriving the transmit steering matrix comprises means for performing a plurality of iterations of Jacobi rotation on a channel matrix with the plurality of transformation matrices, and means for, for each iteration of the Jacobi rotation, deriving a transformation matrix based on the channel matrix, updating the channel matrix based on the transformation matrix, and updating the transmit steering matrix based on the transformation matrix.
22. The apparatus of claim 20, wherein the means for determining the set of parameters based on the plurality of transformation matrices comprises means for forming the set of parameters with at least one angle for at least one element of each transformation matrix.
23. A processor-readable medium including instructions stored thereon, comprising:
a first instruction set for determining a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to a receiver;
and a second instruction set for sending the set of parameters to the transmitter for use by the transmitter to derive the transmit steering matrix.
24. The processor-readable medium of claim 23, wherein the first instruction set comprises a third instruction set for deriving the transmit steering matrix based on a plurality of transformation matrices, and a fourth instruction set for determining the set of parameters based on the plurality of transformation matrices.
25. The processor-readable medium of claim 24, wherein the fourth instruction set comprises a fifth instruction set for forming the set of parameters with at least one angle for at least one element of each transformation matrix.
26. An apparatus comprising:
at least one processor configured to receive a set of parameters defining a transmit steering matrix, to derive the transmit steering matrix based on the set of parameters, and to use the transmit steering matrix for transmission from a transmitter to a receiver; and a memory coupled to the at least one processor.
27. The apparatus of claim 26, wherein the at least one processor is configured to initialize the transmit steering matrix, to form a plurality of transformation matrices based on the set of parameters, and to update the transmit steering matrix with each of the transformation matrices.
28. The apparatus of claim 27, wherein the at least one processor is configured to obtain at least one angle for at least one element of each transformation matrix from the set of parameters, and to form each transformation matrix based on the at least one angle for the transformation matrix.
29. The apparatus of claim 28, wherein the at least one processor is configured to derive the at least one element of each transformation matrix by performing CORDIC computation based on the at least one angle for the transformation matrix.
30. The apparatus of claim 27, wherein the at least one processor is configured to initialize the transmit steering matrix to an identity matrix, a transmit steering matrix for another subcarrier, or a transmit steering matrix for another time interval.
31. A method comprising:
receiving a set of parameters defining a transmit steering matrix;
deriving the transmit steering matrix based on the set of parameters; and using the transmit steering matrix for transmission from a transmitter to a receiver.
32. The method of claim 31, wherein the deriving the transmit steering matrix comprises initializing the transmit steering matrix, forming a plurality of transformation matrices based on the set of parameters, and updating the transmit steering matrix with each of the transformation matrices.
33. The method of claim 32, wherein the forming the plurality of transformation matrices comprises obtaining at least one angle for at least one element of each transformation matrix from the set of parameters, and forming each transformation matrix based on the at least one angle for the transformation matrix.
34. An apparatus comprising:
means for receiving a set of parameters defining a transmit steering matrix;
means for deriving the transmit steering matrix based on the set of parameters;
and means for using the transmit steering matrix for transmission from a transmitter to a receiver.
35. The apparatus of claim 34, wherein the means for deriving the transmit steering matrix comprises means for initializing the transmit steering matrix, means for forming a plurality of transformation matrices based on the set of parameters, and means for updating the transmit steering matrix with each of the transformation matrices.
36. The apparatus of claim 35, wherein the means for forming the plurality of transformation matrices comprises means for obtaining at least one angle for at least one element of each transformation matrix from the set of parameters, and means for forming each transformation matrix based on the at least one angle for the transformation matrix.
37. A processor-readable medium including instructions stored thereon, comprising:
a first instruction set for receiving a set of parameters defining a transmit steering matrix;
a second instruction set for deriving the transmit steering matrix based on the set of parameters; and a third instruction set for using the transmit steering matrix for transmission from a transmitter to a receiver.
38. The processor-readable medium of claim 37, wherein the second instruction set comprises a fourth instruction set for initializing the transmit steering matrix, a fifth instruction set for forming a plurality of transformation matrices based on the set of parameters, and a sixth instruction set for updating the transmit steering matrix with each of the transformation matrices.
39. The processor-readable medium of claim 38, wherein the fifth instruction set comprises a seventh instruction set for obtaining at least one angle for at least one element of each transformation matrix from the set of parameters, and an eighth instruction set for forming each transformation matrix based on the at least one angle for the transformation matrix.
CA2650430A 2006-05-22 2007-05-22 Derivation and feedback of a transmit steering matrix Expired - Fee Related CA2650430C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US80268206P 2006-05-22 2006-05-22
US60/802,682 2006-05-22
PCT/US2007/069498 WO2007137280A2 (en) 2006-05-22 2007-05-22 Derivation and feedback of a transmit steering matrix

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CA2650430A1 true CA2650430A1 (en) 2007-11-29
CA2650430C CA2650430C (en) 2013-01-08

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US (1) US8290089B2 (en)
EP (1) EP2020112B1 (en)
JP (1) JP5096463B2 (en)
KR (1) KR101162811B1 (en)
CN (1) CN101449504B (en)
BR (1) BRPI0711887A2 (en)
CA (1) CA2650430C (en)
RU (1) RU2425448C2 (en)
WO (1) WO2007137280A2 (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8204149B2 (en) 2003-12-17 2012-06-19 Qualcomm Incorporated Spatial spreading in a multi-antenna communication system
US7336746B2 (en) 2004-12-09 2008-02-26 Qualcomm Incorporated Data transmission with spatial spreading in a MIMO communication system
US8169889B2 (en) 2004-02-18 2012-05-01 Qualcomm Incorporated Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US8923785B2 (en) 2004-05-07 2014-12-30 Qualcomm Incorporated Continuous beamforming for a MIMO-OFDM system
US7978649B2 (en) * 2004-07-15 2011-07-12 Qualcomm, Incorporated Unified MIMO transmission and reception
US8543070B2 (en) 2006-04-24 2013-09-24 Qualcomm Incorporated Reduced complexity beam-steered MIMO OFDM system
US8233556B2 (en) * 2006-07-19 2012-07-31 Texas Instruments Incorporated Reduced feedback transmit beamforming
US7970355B2 (en) * 2007-12-04 2011-06-28 Designart Networks Ltd Method and device for wireless communication using MIMO techniques
US8447236B2 (en) * 2008-05-15 2013-05-21 Qualcomm Incorporated Spatial interference mitigation schemes for wireless communication
US8081700B2 (en) * 2008-06-06 2011-12-20 Redpine Signals, Inc. Power allocation method for MIMO transmit beamforming
AU2009295275A1 (en) * 2008-09-18 2010-03-25 Commonwealth Scientific And Industrial Research Organisation Vector quantization in wireless communication
US20100119017A1 (en) * 2008-11-10 2010-05-13 Joonsuk Kim Method and system for a 4x2 sfbc/stbc system with 2 spatial streams using angle feedback
US8830918B2 (en) 2009-03-16 2014-09-09 Interdigital Patent Holdings, Inc. Method and apparatus for performing uplink transmit diversity
US9667378B2 (en) 2009-10-01 2017-05-30 Telefonaktiebolaget Lm Ericsson (Publ) Multi-granular feedback reporting and feedback processing for precoding in telecommunications
US8971178B1 (en) * 2010-04-05 2015-03-03 Marvell International Ltd. Calibration correction for implicit beamformer using an explicit beamforming technique in a wireless MIMO communication system
US9444577B1 (en) 2010-04-05 2016-09-13 Marvell International Ltd. Calibration correction for implicit beamformer using an explicit beamforming technique in a wireless MIMO communication system
CN101882952B (en) * 2010-06-24 2012-12-19 东南大学 Space division multiple address transmission method of statistical characteristic mode
WO2012021449A1 (en) * 2010-08-10 2012-02-16 Marvell World Trade Ltd. Sub-band feedback for beamforming on downlink multiple user mimo configurations
WO2012109529A1 (en) 2011-02-11 2012-08-16 Interdigital Patent Holdings, Inc. Method and apparatus for uplink closed loop transmit diversity transmission initial access
KR20120126572A (en) * 2011-05-12 2012-11-21 한국전자통신연구원 Cognitive radio base station and communication method of the cognitive radio base station in a multi-user multiple-input multiple output cognitive radio network system
US9154969B1 (en) 2011-09-29 2015-10-06 Marvell International Ltd. Wireless device calibration for implicit transmit
US9088448B2 (en) * 2011-11-11 2015-07-21 Mediatek Singapore Pte. Ltd. Phased array device and calibration method therefor
JP5699913B2 (en) * 2011-11-21 2015-04-15 アイコム株式会社 COMMUNICATION DEVICE AND COMMUNICATION METHOD
US9112554B1 (en) * 2013-06-12 2015-08-18 Marvell International Ltd. Estimation of correlated MIMO channels
JP2017157955A (en) * 2016-02-29 2017-09-07 富士通株式会社 Communication device, communication method, and communication system
US11088734B2 (en) * 2016-08-25 2021-08-10 Skylark Wl Holdings, Llc Efficient channel estimation for implicit MU-MIMO
TWI618374B (en) * 2017-04-21 2018-03-11 國立臺灣大學 Methods of beam-indexed spatial modulation
US10848210B2 (en) * 2017-05-21 2020-11-24 Lg Electronics Inc. Method for transmitting feedback information in wireless communication system and apparatus therefor
CN107508774B (en) * 2017-08-21 2020-11-03 安徽师范大学 Millimeter wave MIMO channel estimation method combining channel representation and beam design
US20190097709A1 (en) * 2017-09-22 2019-03-28 Qualcomm Incorporated Coherent beamforming feedback
CN111628807A (en) * 2019-02-28 2020-09-04 英国电讯有限公司 Channel estimation in MIMO systems

Family Cites Families (171)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337376A (en) 1979-12-31 1982-06-29 Broadcom, Incorporated Communications system and network
IL100213A (en) 1990-12-07 1995-03-30 Qualcomm Inc CDMA microcellular telephone system and distributed antenna system therefor
DE4101629C3 (en) 1991-01-21 2003-06-26 Fuba Automotive Gmbh Antenna diversity system with at least two antennas for the mobile reception of meter and decimeter waves
IT1259032B (en) 1992-05-25 1996-03-11 Alcatel Italia METHOD FOR PROCESSING AND OPTIMIZING THE ANALOGUE FUNCTION IN A DIGITAL RADIO TRANSMISSION SYSTEM IN DIFFERENT SPACE AND / OR ANGLE
US5668837A (en) * 1993-10-14 1997-09-16 Ericsson Inc. Dual-mode radio receiver for receiving narrowband and wideband signals
KR0158092B1 (en) * 1994-02-10 1998-12-01 오오보시 고지 Adaptive spectrum spreading receiver
US5604921A (en) 1995-07-07 1997-02-18 Nokia Mobile Phones Ltd. Radiotelephone user interface for broadcast short message service
US6134215A (en) 1996-04-02 2000-10-17 Qualcomm Incorpoated Using orthogonal waveforms to enable multiple transmitters to share a single CDM channel
WO1998009385A2 (en) * 1996-08-29 1998-03-05 Cisco Technology, Inc. Spatio-temporal processing for communication
US6408016B1 (en) 1997-02-24 2002-06-18 At&T Wireless Services, Inc. Adaptive weight update method and system for a discrete multitone spread spectrum communications system
US6584144B2 (en) * 1997-02-24 2003-06-24 At&T Wireless Services, Inc. Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
US6058105A (en) 1997-09-26 2000-05-02 Lucent Technologies Inc. Multiple antenna communication system and method thereof
US6061023A (en) * 1997-11-03 2000-05-09 Motorola, Inc. Method and apparatus for producing wide null antenna patterns
US6314147B1 (en) 1997-11-04 2001-11-06 The Board Of Trustees Of The Leland Stanford Junior University Two-stage CCI/ISI reduction with space-time processing in TDMA cellular networks
JP3718337B2 (en) 1998-01-08 2005-11-24 株式会社東芝 Adaptive variable directional antenna
US6618454B1 (en) 1998-02-06 2003-09-09 At&T Corp. Diversity coded OFDM for high data-rate communication
US6317466B1 (en) * 1998-04-15 2001-11-13 Lucent Technologies Inc. Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver
US6198775B1 (en) * 1998-04-28 2001-03-06 Ericsson Inc. Transmit diversity method, systems, and terminals using scramble coding
US6175743B1 (en) * 1998-05-01 2001-01-16 Ericsson Inc. System and method for delivery of short message service messages to a restricted group of subscribers
KR100778647B1 (en) 1998-09-04 2007-11-22 에이티 앤드 티 코포레이션 Combined channel coding and space-block coding in a multi-antenna arrangement
WO2000018056A1 (en) * 1998-09-18 2000-03-30 Hughes Electronics Corporation Method and constructions for space-time codes for psk constellations for spatial diversity in multiple-element antenna systems
US6363121B1 (en) 1998-12-07 2002-03-26 Lucent Technologies Inc. Wireless transmission method for antenna arrays using unitary space-time signals
GB9828216D0 (en) 1998-12-21 1999-02-17 Northern Telecom Ltd A downlink beamforming approach for frequency division duplex cellular systems
WO2000049730A1 (en) 1999-02-16 2000-08-24 Mitsubishi Denki Kabushiki Kaisha Radio communication system, transmitter and receiver
US6218985B1 (en) * 1999-04-15 2001-04-17 The United States Of America As Represented By The Secretary Of The Navy Array synthesis method
CN1921323A (en) 1999-10-19 2007-02-28 美商内数位科技公司 Receiver for multiuser detection CDMA signals
US6788661B1 (en) 1999-11-12 2004-09-07 Nikia Networks Oy Adaptive beam-time coding method and apparatus
US6351499B1 (en) * 1999-12-15 2002-02-26 Iospan Wireless, Inc. Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter
US6298035B1 (en) 1999-12-21 2001-10-02 Nokia Networks Oy Estimation of two propagation channels in OFDM
US6888809B1 (en) 2000-01-13 2005-05-03 Lucent Technologies Inc. Space-time processing for multiple-input, multiple-output, wireless systems
US6804307B1 (en) 2000-01-27 2004-10-12 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for efficient transmit diversity using complex space-time block codes
US6816555B2 (en) 2000-02-18 2004-11-09 Sony Corporation Signal component demultiplexing apparatus, filter apparatus, receiving apparatus, communication apparatus, and communication method
US6473467B1 (en) 2000-03-22 2002-10-29 Qualcomm Incorporated Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system
US6493331B1 (en) 2000-03-30 2002-12-10 Qualcomm Incorporated Method and apparatus for controlling transmissions of a communications systems
US6542556B1 (en) * 2000-03-31 2003-04-01 Nokia Mobile Phones Ltd. Space-time code for multiple antenna transmission
US7068628B2 (en) 2000-05-22 2006-06-27 At&T Corp. MIMO OFDM system
US20020009125A1 (en) * 2000-06-12 2002-01-24 Shi Zhen Liang High bandwidth efficient spread spectrum modulation using chirp waveform
JP2001358692A (en) 2000-06-14 2001-12-26 Nec Corp Orthogonal frequency-division multiplex modulating and demodulating circuit
KR100493152B1 (en) 2000-07-21 2005-06-02 삼성전자주식회사 Transmission antenna diversity method, base station apparatus and mobile station apparatus therefor in mobile communication system
US6486828B1 (en) 2000-07-26 2002-11-26 Western Multiplex Adaptive array antenna nulling
US7065156B1 (en) * 2000-08-31 2006-06-20 Nokia Mobile Phones Ltd. Hopped delay diversity for multiple antenna transmission
US6985434B2 (en) 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
US6694147B1 (en) 2000-09-15 2004-02-17 Flarion Technologies, Inc. Methods and apparatus for transmitting information between a basestation and multiple mobile stations
US6842487B1 (en) * 2000-09-22 2005-01-11 Telefonaktiebolaget Lm Ericsson (Publ) Cyclic delay diversity for mitigating intersymbol interference in OFDM systems
US6956897B1 (en) 2000-09-27 2005-10-18 Northwestern University Reduced rank adaptive filter
US7110378B2 (en) 2000-10-03 2006-09-19 Wisconsin Alumni Research Foundation Channel aware optimal space-time signaling for wireless communication over wideband multipath channels
EP1195937A1 (en) * 2000-10-03 2002-04-10 Telefonaktiebolaget Lm Ericsson Space-time coding with orthogonal transformations
ATE554578T1 (en) * 2000-11-20 2012-05-15 Sony Deutschland Gmbh ADAPTIVE SUB CARRIER LOAD
EP1387180A1 (en) 2000-12-12 2004-02-04 Matsushita Electric Industrial Co., Ltd. Radio-wave arrival-direction estimating apparatus and directional variable transceiver
JP3576099B2 (en) 2000-12-22 2004-10-13 株式会社東芝 Receiver using smart antenna, receiving method using smart antenna, and beam forming circuit
US7050510B2 (en) 2000-12-29 2006-05-23 Lucent Technologies Inc. Open-loop diversity technique for systems employing four transmitter antennas
US6801790B2 (en) 2001-01-17 2004-10-05 Lucent Technologies Inc. Structure for multiple antenna configurations
GB0102316D0 (en) * 2001-01-30 2001-03-14 Koninkl Philips Electronics Nv Radio communication system
EP1241824A1 (en) 2001-03-14 2002-09-18 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Multiplexing method in a multicarrier transmit diversity system
US6771706B2 (en) 2001-03-23 2004-08-03 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US6496535B2 (en) 2001-03-23 2002-12-17 Navini Networks, Inc. Method and system for effective channel estimation in a telecommunication system
GB0108381D0 (en) 2001-04-04 2001-05-23 Koninl Philips Electronics Nv Radio communication system
US6982946B2 (en) * 2001-04-05 2006-01-03 Telefonaktiebolaget Lm Ericsson (Publ) Partly orthogonal multiple code trees
US7929631B2 (en) * 2001-04-23 2011-04-19 Texas Instruments Incorporated Multiple space time transmit diversity communication system with selected complex conjugate inputs
US6859747B2 (en) * 2001-04-26 2005-02-22 Siemens Energy & Automation, Inc. Method and apparatus for self-calibrating a motion control system
US7173981B1 (en) 2001-04-27 2007-02-06 The Directv Group, Inc. Dual layer signal processing in a layered modulation digital signal system
US6785341B2 (en) 2001-05-11 2004-08-31 Qualcomm Incorporated Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
US7190734B2 (en) * 2001-05-25 2007-03-13 Regents Of The University Of Minnesota Space-time coded transmissions within a wireless communication network
US6711124B2 (en) * 2001-05-25 2004-03-23 Ericsson Inc. Time interval based channel estimation with transmit diversity
US6999472B2 (en) * 2001-05-30 2006-02-14 Nokia Mobile Phones Limited Apparatus, and associated method, for space-time encoding, and decoding, data at a selected code rate
US20020193146A1 (en) 2001-06-06 2002-12-19 Mark Wallace Method and apparatus for antenna diversity in a wireless communication system
FR2827439B1 (en) * 2001-07-13 2003-10-24 Leroy Somer Moteurs DISCOID MACHINE
US6441786B1 (en) * 2001-07-20 2002-08-27 Motorola, Inc. Adaptive antenna array and method for control thereof
CN1161907C (en) * 2001-07-20 2004-08-11 华为技术有限公司 Downstream feedback multiple-antenna emitting method and device for radio communication system
EP1283614A1 (en) * 2001-08-10 2003-02-12 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Channel estimation in a multicarrier transmit diversity system
US7359466B2 (en) * 2001-08-24 2008-04-15 Lucent Technologies Inc. Signal detection by a receiver in a multiple antenna time-dispersive system
US7149254B2 (en) 2001-09-06 2006-12-12 Intel Corporation Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems
US7248559B2 (en) * 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US7327798B2 (en) * 2001-10-19 2008-02-05 Lg Electronics Inc. Method and apparatus for transmitting/receiving signals in multiple-input multiple-output communication system provided with plurality of antenna elements
KR200260860Y1 (en) 2001-10-25 2002-01-17 김지환 Collapsible charger for portable phone
US7095987B2 (en) * 2001-11-15 2006-08-22 Texas Instruments Incorporated Method and apparatus for received uplinked-signal based adaptive downlink diversity within a communication system
US6760388B2 (en) * 2001-12-07 2004-07-06 Qualcomm Incorporated Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems
JP3992489B2 (en) * 2001-12-12 2007-10-17 株式会社エヌ・ティ・ティ・ドコモ Wireless communication method and apparatus
US20030112745A1 (en) * 2001-12-17 2003-06-19 Xiangyang Zhuang Method and system of operating a coded OFDM communication system
JP2003198645A (en) * 2001-12-27 2003-07-11 Sharp Corp Transmitter and communication system using the same
MXPA04006551A (en) 2002-01-04 2005-07-13 Nokia Corp High rate transmit diversity transmission and reception.
US7020110B2 (en) 2002-01-08 2006-03-28 Qualcomm Incorporated Resource allocation for MIMO-OFDM communication systems
JP4191050B2 (en) 2002-01-18 2008-12-03 富士通株式会社 Feedback control method and apparatus in closed-loop transmission diversity
US6862271B2 (en) * 2002-02-26 2005-03-01 Qualcomm Incorporated Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
US6785520B2 (en) 2002-03-01 2004-08-31 Cognio, Inc. System and method for antenna diversity using equal power joint maximal ratio combining
US20030181211A1 (en) 2002-03-19 2003-09-25 Javad Razavilar Method and apparatus for dynamic channel selection in wireless modems
JP3881266B2 (en) 2002-03-19 2007-02-14 松下電器産業株式会社 Time code signal transmission method and time code signal transmission apparatus
US7197084B2 (en) 2002-03-27 2007-03-27 Qualcomm Incorporated Precoding for a multipath channel in a MIMO system
US6847805B2 (en) * 2002-03-29 2005-01-25 Lucent Technologies Inc. Method for closed-loop subspace transmission and reception in a two transmit N-receive antenna system
US6741587B2 (en) 2002-04-02 2004-05-25 Nokia Corporation Inter-frequency measurements with MIMO terminals
US6801580B2 (en) 2002-04-09 2004-10-05 Qualcomm, Incorporated Ordered successive interference cancellation receiver processing for multipath channels
KR100896682B1 (en) 2002-04-09 2009-05-14 삼성전자주식회사 Mobile communication apparatus and method having transmitting/receiving multiantenna
US7522673B2 (en) * 2002-04-22 2009-04-21 Regents Of The University Of Minnesota Space-time coding using estimated channel information
US6711528B2 (en) * 2002-04-22 2004-03-23 Harris Corporation Blind source separation utilizing a spatial fourth order cumulant matrix pencil
EP1359684A1 (en) 2002-04-30 2003-11-05 Motorola Energy Systems Inc. Wireless transmission using an adaptive transmit antenna array
KR100511292B1 (en) * 2002-04-30 2005-08-31 엘지전자 주식회사 Update method for beamforming weight vector of rake receiver and receiving apparatus using beamforming weight vector
US6847306B2 (en) * 2002-05-17 2005-01-25 Keyvan T. Diba Emergency traffic signal attachment
US6810506B1 (en) 2002-05-20 2004-10-26 Synopsys, Inc. Methodology for stitching reduced-order models of interconnects together
US7327800B2 (en) * 2002-05-24 2008-02-05 Vecima Networks Inc. System and method for data detection in wireless communication systems
GB0212165D0 (en) * 2002-05-27 2002-07-03 Nokia Corp A wireless system
FI20021013A0 (en) 2002-05-29 2002-05-29 Nokia Corp Procedure for data communication and data transmission systems
KR100548311B1 (en) 2002-06-07 2006-02-02 엘지전자 주식회사 Transmission diversity apparatus and method for mobile communication system
US7095709B2 (en) 2002-06-24 2006-08-22 Qualcomm, Incorporated Diversity transmission modes for MIMO OFDM communication systems
US7061967B2 (en) 2002-06-24 2006-06-13 Comsys Communication & Signal Processing Ltd. Multipath channel tap delay estimation in a CDMA spread spectrum receiver
US7613248B2 (en) * 2002-06-24 2009-11-03 Qualcomm Incorporated Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems
US7301924B1 (en) 2002-07-15 2007-11-27 Cisco Technology, Inc. Media access control for MIMO wireless network
US7092737B2 (en) * 2002-07-31 2006-08-15 Mitsubishi Electric Research Laboratories, Inc. MIMO systems with rate feedback and space time transmit diversity
JP3677492B2 (en) 2002-07-31 2005-08-03 松下電器産業株式会社 Multicarrier transmission apparatus and multicarrier transmission method
JP4098027B2 (en) 2002-08-01 2008-06-11 松下電器産業株式会社 Wireless base station equipment
US7394754B2 (en) * 2002-08-01 2008-07-01 Mediatek Inc. System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system
US6940917B2 (en) 2002-08-27 2005-09-06 Qualcomm, Incorporated Beam-steering and beam-forming for wideband MIMO/MISO systems
US7529177B2 (en) 2002-08-28 2009-05-05 Agere Systems Inc. Dithering scheme using multiple antennas for OFDM systems
EP1396956B1 (en) 2002-09-05 2007-11-07 Mitsubishi Electric Information Technology Centre Europe B.V. MC-CDMA downlink beamforming method with the weights applied to every element of the antenna array being different for every user and every frequency bin, the weights being adapted to maximise the signal to interference and noise ratio
US7031669B2 (en) * 2002-09-10 2006-04-18 Cognio, Inc. Techniques for correcting for phase and amplitude offsets in a MIMO radio device
US20040081263A1 (en) * 2002-10-24 2004-04-29 Lee King F. Method and apparatus for receiving diversity transmissions
US8134976B2 (en) * 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US7151809B2 (en) * 2002-10-25 2006-12-19 Qualcomm, Incorporated Channel estimation and spatial processing for TDD MIMO systems
US8320301B2 (en) * 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US7324429B2 (en) 2002-10-25 2008-01-29 Qualcomm, Incorporated Multi-mode terminal in a wireless MIMO system
US8208364B2 (en) * 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US7317750B2 (en) * 2002-10-31 2008-01-08 Lot 41 Acquisition Foundation, Llc Orthogonal superposition coding for direct-sequence communications
WO2004043082A2 (en) 2002-11-04 2004-05-21 Vivato, Inc. Complementary beamforming methods and apparatuses
US7057555B2 (en) * 2002-11-27 2006-06-06 Cisco Technology, Inc. Wireless LAN with distributed access points for space management
US7280625B2 (en) 2002-12-11 2007-10-09 Qualcomm Incorporated Derivation of eigenvectors for spatial processing in MIMO communication systems
US7024166B2 (en) 2002-12-18 2006-04-04 Qualcomm, Incorporated Transmission diversity systems
US7200631B2 (en) * 2003-01-10 2007-04-03 Lucent Technologies Inc. Method and apparatus for determining an inverse square root of a given positive-definite hermitian matrix
US7386057B2 (en) * 2003-02-20 2008-06-10 Nec Corporation Iterative soft interference cancellation and filtering for spectrally efficient high-speed transmission in MIMO systems
US7130580B2 (en) 2003-03-20 2006-10-31 Lucent Technologies Inc. Method of compensating for correlation between multiple antennas
US7327795B2 (en) * 2003-03-31 2008-02-05 Vecima Networks Inc. System and method for wireless communication systems
US7099678B2 (en) * 2003-04-10 2006-08-29 Ipr Licensing, Inc. System and method for transmit weight computation for vector beamforming radio communication
US7385617B2 (en) * 2003-05-07 2008-06-10 Illinois Institute Of Technology Methods for multi-user broadband wireless channel estimation
US7079870B2 (en) * 2003-06-09 2006-07-18 Ipr Licensing, Inc. Compensation techniques for group delay effects in transmit beamforming radio communication
WO2005006638A2 (en) 2003-06-18 2005-01-20 University Of Florida Wireless lan compatible multi-input multi-output system
GB0317147D0 (en) * 2003-07-22 2003-08-27 Dalton Stephen "GAM"- Gravity-air-motion
KR100584321B1 (en) * 2003-08-02 2006-05-26 삼성전자주식회사 Tdma type transceiver having cartesian feedback loop circuit
KR100575993B1 (en) 2003-08-07 2006-05-02 삼성전자주식회사 Method and apparatus for scheduling multi-user in wireless communication system using multiple transmit/receive antenna
US7065144B2 (en) 2003-08-27 2006-06-20 Qualcomm Incorporated Frequency-independent spatial processing for wideband MISO and MIMO systems
US7356073B2 (en) * 2003-09-10 2008-04-08 Nokia Corporation Method and apparatus providing an advanced MIMO receiver that includes a signal-plus-residual-interference (SPRI) detector
US7742546B2 (en) * 2003-10-08 2010-06-22 Qualcomm Incorporated Receiver spatial processing for eigenmode transmission in a MIMO system
US7298805B2 (en) 2003-11-21 2007-11-20 Qualcomm Incorporated Multi-antenna transmission for spatial division multiple access
US8204149B2 (en) 2003-12-17 2012-06-19 Qualcomm Incorporated Spatial spreading in a multi-antenna communication system
US7302009B2 (en) * 2003-12-17 2007-11-27 Qualcomm Incorporated Broadcast transmission with spatial spreading in a multi-antenna communication system
US7778425B2 (en) * 2003-12-24 2010-08-17 Nokia Corporation Method for generating noise references for generalized sidelobe canceling
US7336746B2 (en) * 2004-12-09 2008-02-26 Qualcomm Incorporated Data transmission with spatial spreading in a MIMO communication system
US7194042B2 (en) * 2004-01-13 2007-03-20 Qualcomm Incorporated Data transmission with spatial spreading in a mimo communication system
US20050180312A1 (en) * 2004-02-18 2005-08-18 Walton J. R. Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US8169889B2 (en) 2004-02-18 2012-05-01 Qualcomm Incorporated Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US7206354B2 (en) * 2004-02-19 2007-04-17 Qualcomm Incorporated Calibration of downlink and uplink channel responses in a wireless MIMO communication system
US7447268B2 (en) 2004-03-31 2008-11-04 Intel Corporation OFDM system with per subcarrier phase rotation
US7583747B1 (en) 2004-03-31 2009-09-01 University Of Alberta Method of systematic construction of space-time constellations, system and method of transmitting space-time constellations
US20050238111A1 (en) 2004-04-09 2005-10-27 Wallace Mark S Spatial processing with steering matrices for pseudo-random transmit steering in a multi-antenna communication system
US7555053B2 (en) * 2004-04-14 2009-06-30 Broadcom Corporation Long training sequence for MIMO WLAN systems
US7564814B2 (en) 2004-05-07 2009-07-21 Qualcomm, Incorporated Transmission mode and rate selection for a wireless communication system
US8285226B2 (en) 2004-05-07 2012-10-09 Qualcomm Incorporated Steering diversity for an OFDM-based multi-antenna communication system
US8923785B2 (en) 2004-05-07 2014-12-30 Qualcomm Incorporated Continuous beamforming for a MIMO-OFDM system
US20050267925A1 (en) 2004-05-28 2005-12-01 Clue Vladimir I Methods and apparatus for transforming amplitude-frequency signal characteristics and interpolating analytical functions using circulant matrices
US8619907B2 (en) 2004-06-10 2013-12-31 Agere Systems, LLC Method and apparatus for preamble training in a multiple antenna communication system
US7110463B2 (en) 2004-06-30 2006-09-19 Qualcomm, Incorporated Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
US7978649B2 (en) * 2004-07-15 2011-07-12 Qualcomm, Incorporated Unified MIMO transmission and reception
US7894548B2 (en) * 2004-09-03 2011-02-22 Qualcomm Incorporated Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system
US7978778B2 (en) * 2004-09-03 2011-07-12 Qualcomm, Incorporated Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
US7539253B2 (en) * 2004-09-10 2009-05-26 Intel Corporation Interpolation in channel state feedback
US7289770B2 (en) * 2004-09-28 2007-10-30 Intel Corporation Compact feedback for closed loop MIMO
US7656842B2 (en) * 2004-09-30 2010-02-02 Motorola, Inc. Method and apparatus for MIMO transmission optimized for successive cancellation receivers
US7711762B2 (en) * 2004-11-15 2010-05-04 Qualcomm Incorporated Efficient computation for eigenvalue decomposition and singular value decomposition of matrices
US7895254B2 (en) * 2004-11-15 2011-02-22 Qualcomm Incorporated Eigenvalue decomposition and singular value decomposition of matrices using Jacobi rotation
KR101084792B1 (en) 2004-11-15 2011-11-21 콸콤 인코포레이티드 Eigenvalue decomposition and singular value decomposition of matrices using jacobi rotation
US20060285531A1 (en) 2005-06-16 2006-12-21 Howard Steven J Efficient filter weight computation for a MIMO system
US7548730B2 (en) * 2006-03-16 2009-06-16 Intel Corporation Systems and methods for improving performance of multiple spatial communication channels
US8543070B2 (en) 2006-04-24 2013-09-24 Qualcomm Incorporated Reduced complexity beam-steered MIMO OFDM system
US7787554B1 (en) * 2006-05-02 2010-08-31 Marvell International Ltd. Beamforming to a subset of receive antennas in a wireless MIMO communication system

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