公开(公告)号：CA2446512C

公开(公告)日：2012-03-13

申请号：CA2446512

申请日：2002-05-07

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  KETCHUM JOHN W ,  HOWARD STEVEN J

IPC: H04B7/08 ,  H04J99/00 ,  H04B7/06 ,  H04B7/12 ,  H04L1/00 ,  H04L1/06

Abstract: Techniques to "successively" process received signals at a receiver unit in a MIMO system to recover transmitted data, and to "adaptively" process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.

公开(公告)号：AT534198T

公开(公告)日：2011-12-15

申请号：AT05015739

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  WALTON JAY R ,  JALALI AHMAD

IPC: H04B7/00 ,  H04J11/00 ,  H04B1/707 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04B17/00 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04W52/08 ,  H04W52/42

Abstract: The invention relates to a method for transmitting pilot signals used for measuring and reporting channel state information, CSI, in a multiple input/multiple output, MIMO, system, comprising: generating a pilot sequence by using a maximal-length shift register sequence, m-sequence; assigning a different shift to multiple transmit antennas, wherein the value of the shift is dependent on at least one characteristic of the communication channel; generating a pilot signal at each transmit antenna by shifting the pilot sequence by the value specified by the shift; and transmitting the pilot signal via the transmit antenna.

公开(公告)号：AT446615T

公开(公告)日：2009-11-15

申请号：AT05744347

申请日：2005-04-29

Applicant: QUALCOMM INC

Inventor： WALTON JAY ,  ANTONIO FRANKLIN ,  WALLACE MARK ,  NARAYAN SRIRAM

IPC: H04B1/16 ,  H04J99/00 ,  H04B7/06 ,  H04B7/08

Abstract: A multi-antenna wireless device (100) comprising a plurality of (N) transmitter units (120) operatively coupled to a plurality of antennas (122), one transmitter unit (120) for each set of at least one antenna from among the plurality of antennas (122), each transmitter unit (120) operable to process a respective input signal and provide an output signal; a plurality of processing units (114, 116, 118, 132, 134, 136, 210, 212, 214, 216, 218, 220, 232), each processing unit operable to perform designated processing for data transmission; and a controller (140, 230) that selectively and individually enables or disables at least one of the N transmitter units (120) and at least one of the plurality of processing units (114, 116, 118, 132, 134, 136, 210, 212, 214, 216, 218, 220, 232).

公开(公告)号：AU2003287297C1

公开(公告)日：2009-10-01

申请号：AU2003287297

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04L1/06 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W16/28 ,  H04W28/20 ,  H04W52/50

Abstract: Pilots suitable for use in MIMO systems and capable of supporting various functions are described. The various types of pilot include-a beacon pilot, a MIMO pilot, a steered reference or steered pilot, and a carrier pilot. The beacon pilot is transmitted from all transmit antennas and may be used for timing and frequency acquisition. The MIMO pilot is transmitted from all transmit antennas but is covered with different orthogonal codes assigned to the transmit antennas. The MIMO pilot may be used for channel estimation. The steered reference is transmitted on specific eigenmodes of a MIMO channel and is user terminal specific. The steered reference may be used for channel estimation. The carrier pilot may be transmitted on designated subbands/antennas and may be used for phase tracking of a carrier signal. Various pilot transmission schemes may be devised based on different combinations of these various types of pilot.

公开(公告)号：AU2003287296C1

公开(公告)日：2009-07-16

申请号：AU2003287296

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  HOWARD STEVEN J ,  WALTON JAY RODNEY ,  WALLACE MARK

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas.; For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.

公开(公告)号：AU2003297343B2

公开(公告)日：2009-05-21

申请号：AU2003297343

申请日：2003-12-17

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  LUNDBY STEIN A

IPC: H04B7/06 ,  H04B7/005

Abstract: A time-varying transformation is used to correlate the magnitude of the interference between multiple antenna paths. Embodiments incorporating the time-varying transformations provide transmit diversity gains to remote stations that are not configured for transmit diversity reception. In addition, some of the embodiments can be further configured to balance the load between multiple power amplifiers.

公开(公告)号：HK1121899A1

公开(公告)日：2009-04-30

申请号：HK09100872

申请日：2006-04-10

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04W20090101 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50 ,  H04W74/08

Abstract: Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a "fast" RACH (F-RACH) and a "slow" RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. The user terminals may use the F-RACH or S-RACH, or both, to gain access to the system.

公开(公告)号：DE60326627D1

公开(公告)日：2009-04-23

申请号：DE60326627

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04J99/00 ,  H04L1/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas.; For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.

公开(公告)号：AT425603T

公开(公告)日：2009-03-15

申请号：AT03781529

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON JAY ,  KETCHUM JOHN ,  WALLACE MARK ,  HOWARD STEVEN

IPC: H04J99/00 ,  H04L1/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas.; For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.

公开(公告)号：UA85830C2

公开(公告)日：2009-03-10

申请号：UAA200504942

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALLACE MARK ,  WALTON J RODNEY ,  HOWARD STEPHAN J

IPC: H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/28 ,  H04W52/50

Abstract: Оцінкаканалутапростороваобробкадля TDD МІМОсистеми. Калібруванняможебутивиконанез метоюскладаннявідмінностіу відповідяхланцюгівприйому/передачів точцідоступуі терміналікористувача (512). Протягомнормальноїопераціїпілот-сигналМІМОпередаєтьсянапершулінію (522) зв'язкуі використовуєтьсяз метоюодержанняоцінкивідповідіканалупершоїлініїзв'язку (524), якарозкладенадляодержаннядіагональноїматрицісингулярнихзначеньі першоїунітарноїматриці, якаміститьі лівівласнівекторипершоїлініїзв'язку, іправівласнівекторидругоїлініїзв'язку (526). Регульованийопорнийсигнал (посилання) передаєтьсяподругійлініїзв'язку, використовуючивласнівекторив першійунітарнійматриці (530), іобробляєтьсядляодержаннядіагональноїматриціі другоїунітарноїматриці, якаміститьі лівівласнівекторидругоїлініїзв'язку, іправівласнівекторипершоїлініїзв'язку (532). Кожнаунітарнаматрицяможебутивикористанадлявиконанняпросторовоїобробкидляприйому/передачіданихнаобохлініяхзв'язку (540, 542, 550, 552).