公开(公告)号：CA2501634C

公开(公告)日：2014-08-12

申请号：CA2501634

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04W4/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W16/28 ,  H04W28/20 ,  H04W52/50 ,  H04W72/00

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：CA2747273C

公开(公告)日：2014-03-11

申请号：CA2747273

申请日：2005-02-18

Applicant: QUALCOMM INC

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

IPC: H04B7/06 ,  H04B7/04 ,  H04J11/00 ,  H04J99/00 ,  H04L1/06 ,  H04L25/02 ,  H04L27/26 ,  H04W24/10

Abstract: A multi-antenna transmitting entity transmits data to a single- or multi- antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. The PRTS mode may be used to achieve transmit diversity or spatial spreading. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across an entire packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission.

公开(公告)号：DK2363970T3

公开(公告)日：2014-02-17

申请号：DK11153572

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04L1/06 ,  H04B7/005 ,  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

公开(公告)号：AU2011253751B2

公开(公告)日：2014-01-23

申请号：AU2011253751

申请日：2011-11-30

Applicant: QUALCOMM INC

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

IPC: H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  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：ES2438718T3

公开(公告)日：2014-01-20

申请号：ES11153572

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04L1/06 ,  H04B7/005 ,  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: Un terminal (120x) en un sistema de comunicación inalámbrica de múltiples entradas y múltiples salidas, MIMO, que comprende: un procesador espacial (460) de recepción, operativo para procesar un piloto de MIMO recibido desde un punto de acceso por un enlace descendente en el sistema de MIMO, para obtener estimaciones de respuesta de canal para el enlace descendiente, en el cual el piloto de MIMO comprende una pluralidad de pilotos ortogonales generados en base a un primer símbolo piloto y una pluralidad de secuencias ortogonales asignadas a una pluralidad de antenas en el punto de acceso, con un piloto ortogonal para cada una entre la pluralidad de antenas; estando el terminal caracterizado por un procesador espacial (490) de transmisión, operativo para generar un piloto dirigido, en base a un segundo símbolo piloto y un vector de dirección para un canal espacial, por un enlace ascendente en el sistema de MIMO; y un controlador (480) operativo para obtener el vector de dirección para el canal espacial en el enlace ascendente, en base a las estimaciones de respuesta de canal obtenidas para el enlace descendente.

公开(公告)号：CA2501458C

公开(公告)日：2013-02-19

申请号：CA2501458

申请日：2003-10-27

Applicant: QUALCOMM INC

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

IPC: H04J11/00 ,  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 ,  H04W16/10 ,  H04W28/16 ,  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：CA2446877C

公开(公告)日：2013-01-29

申请号：CA2446877

申请日：2002-05-15

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04W72/12 ,  H04B7/04 ,  H04B7/06 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04W4/06 ,  H04W16/00 ,  H04W16/10 ,  H04W16/28 ,  H04W84/14

Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antenna assigned to the terminal.

公开(公告)号：CA2650430C

公开(公告)日：2013-01-08

申请号：CA2650430

申请日：2007-05-22

Applicant: QUALCOMM INC

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

IPC: H04L1/06

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.

公开(公告)号：BRPI0712409A2

公开(公告)日：2012-08-14

申请号：BRPI0712409

申请日：2007-05-30

Applicant: QUALCOMM INC

Inventor： SURINENI SHRAVAN K ,  WALTON J RODNEY ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04L12/28 ,  H04B7/06 ,  H04L1/16 ,  H04L12/841

公开(公告)号：CA2572591C

公开(公告)日：2012-05-22

申请号：CA2572591

申请日：2005-06-27

Applicant: QUALCOMM INC

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

IPC: H04B7/08 ,  H04J99/00

Abstract: Techniques for efficiently computing spatial filter matrices are described. The channel response matrices for a MIMO channel may be highly correlated if the channel is relatively static over a range of transmission spans. In this case, an initial spatial filter matrix may be derived based on one channel response matrix, and a spatial filter matrix for each transmission span may be computed based on the initial spatial filter matrix and a steering matrix used for that transmission span. The channel response matrices may be partially correlated if the MIMO channel is not static but does not change abruptly. In this case, a spatial filter matrix may be derived for one transmission span and used to derive an initial spatial filter matrix for another transmission span m. A spatial filter matrix for transmission span m may be computed based on the initial spatial filter matrix, e.g., using an iterative procedure.