公开(公告)号：AU2003287296A1

公开(公告)日：2004-05-13

申请号：AU2003287296

申请日：2003-10-24

Applicant: QUALCOMM INC

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

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：AU2003287291A1

公开(公告)日：2004-05-13

申请号：AU2003287291

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L1/18 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W28/06 ,  H04W28/20 ,  H04W28/22 ,  H04W52/00 ,  H04W52/42 ,  H04W52/50 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00 ,  H04W74/08 ,  H04W84/12

Abstract: A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgement, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.

公开(公告)号：AU2003284944A1

公开(公告)日：2004-05-13

申请号：AU2003284944

申请日：2003-10-27

Applicant: QUALCOMM INC

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

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

Abstract: Techniques to use OFDM symbols of different sizes to achieve greater efficiency for OFDM systems. The system traffic may be arranged into different categories (e.g., control data, user data, and pilot data). For each category, one or more OFDM symbols of the proper sizes may be selected for use based on the expected payload size for the traffic in that category. In a further aspect, the channel response matrix for each of a plurality of subbands is decomposed in a manner to avoid arbitrary phase rotations from subband to subband by constraining the first element in each column of the first unitary matrix to be a non-negative value. In another aspect, steering vectors are interpolated between subbands.

公开(公告)号：CA2756728A1

公开(公告)日：2004-05-06

申请号：CA2756728

申请日：2003-10-27

Applicant: QUALCOMM INC

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

IPC: H04W24/02 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/10 ,  H04W28/20 ,  H04W52/50

Abstract: System traffic may be arranged into different categories (e.g., control data, user data, and pilot data). For each category, one or more OFDM symbols of the proper sizes may be selected for use based on the expected payload size for the traffic in that category. For example, control data may be transmitted using OFDM symbols of a first size, user data may be transmitted using OFDM symbols of the first size and a second size, and pilot data may be transmitted using OFDM symbols of a third size or the first size. In one exemplary design, a small OFDM symbol is utilized for pilot and for transport channels used to send control data, and a large OFDM symbol and the small OFDM symbol are utilized for transport channels used to send user data.

公开(公告)号：CA2501398A1

公开(公告)日：2004-05-06

申请号：CA2501398

申请日：2003-10-24

Applicant: QUALCOMM INC

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

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 ,  H04W28/20 ,  H04W52/50 ,  H04W74/08 ,  H04Q7/38

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 operatin g 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 b y 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：CA2500355A1

公开(公告)日：2004-05-06

申请号：CA2500355

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L1/18 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W28/06 ,  H04W28/20 ,  H04W28/22 ,  H04W52/00 ,  H04W52/42 ,  H04W52/50 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00 ,  H04W74/08 ,  H04W84/12

Abstract: A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implemen ts rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may th en be simplified by taking advantage of the reciprocal nature of the downlink a nd uplink and the calibration.

公开(公告)号：AU2003262813A1

公开(公告)日：2004-03-19

申请号：AU2003262813

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  HOWARD STEVEN J ,  MENON MURALI PARAVATH ,  KETCHUM JOHN W ,  WALLACE MARK

IPC: H04J99/00 ,  H01Q3/26 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L27/26

Abstract: Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scaling value is then obtained for each subband based on its allocated transmit power. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steering vector. A stream of preconditioned symbols is then formed for each transmit antenna.

公开(公告)号：CA2495438A1

公开(公告)日：2004-03-11

申请号：CA2495438

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： MENON MURALI PARAVATH ,  WALLACE MARK ,  WALTON JAY ROD ,  HOWARD STEVEN J ,  KETCHUM JOHN W

IPC: H04J99/00 ,  H01Q3/26 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04L27/26

Abstract: Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on h ow the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scalin g value is then obtained for each subband based on its allocated transmit powe r. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steeri ng vector. A stream of preconditioned symbols is then formed for each transmit antenna.

公开(公告)号：AU2002354000A1

公开(公告)日：2003-05-19

申请号：AU2002354000

申请日：2002-10-31

Applicant: QUALCOMM INC

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

IPC: H04J11/00 ,  H04L1/00 ,  H04Q7/38 ,  H04L27/26

Abstract: Techniques to adaptively control the rate of a data transmission in a wireless (e.g., OFDM) communication system. In an aspect, various types of metrics may be derived and used to select the proper rate for the data transmission. Some types of metrics relate to different characteristics of the communication channel, such as SNR, frequency selectivity, time selectivity, and so on. One type of metric relates to the performance of the data transmission. In another aspect, the various types of metrics may be used in different manners to adaptively control the rate. Some metrics may be used for open-loop control of the rate, other metrics may be used for closed-loop control, and some may be used for both. For example, the channel metrics may be used to determine or select the rate, and the performance metrics may be used to determine whether or not to adjust the rate.

公开(公告)号：CA2736610A1

公开(公告)日：2002-11-21

申请号：CA2736610

申请日：2002-05-14

Applicant: QUALCOMM INC

Inventor： WALTON JAY ROD ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04B1/14 ,  H04W72/12 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L12/56 ,  H04W16/00 ,  H04W24/00 ,  H04W72/04

Abstract: Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypothcses is selected.