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：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：DK1628419T3

公开(公告)日：2012-03-05

申请号：DK05015739

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

公开(公告)号：ES2374732T3

公开(公告)日：2012-02-21

申请号：ES05015739

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  WALTON JAY R ,  JALALI AHMAD

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

Abstract: Un procedimiento de transmisión de símbolos piloto en un sistema (100) de comunicación de múltiples antenas, que comprende: asignar cada una entre una pluralidad de antenas, NT, con una pluralidad de símbolos piloto y un subconjunto distinto entre una pluralidad de subconjuntos de subcanales, en donde cada uno entre la pluralidad de subconjuntos de subcanales incluye un subconjunto distinto de una pluralidad de subcanales, y en donde cada antena transmite por cada NT-ésimo subcanal a través del canal, de modo tal que todos los subcanales sean disjuntos entre las antenas transmisoras; modular cada uno entre la pluralidad asignada de símbolos piloto sobre la respectiva pluralidad asignada de subconjuntos de subcanales; y transmitir cada uno entre la pluralidad asignada de símbolos piloto desde la pluralidad de antenas simultáneamente, usando la respectiva pluralidad de subconjuntos de subcanales, en donde la transmisión desde cada antena ocurre por el subconjunto de subcanales asignado a la antena.

公开(公告)号：CA2404055C

公开(公告)日：2012-01-03

申请号：CA2404055

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOLTZMAN JACK ,  ANTONIO FRANKLIN P

IPC: H04B7/005 ,  H04J1/05 ,  H04B7/26 ,  H04J3/00 ,  H04J11/00 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34

Abstract: In some aspects, each cell in the communications system can be designed to operate in accordance with a set of back-off factors that identify the reductions in peak transmit power levels for the channels associated with the back-off factors. The back-off factors are defined to provide the required power to a large percentage of the users while reducing the amount of interference. In some other aspects, the cells operate using an adaptive reuse scheme that allows the cells to efficiently allocate and reallocate the system resources to reflect changes in the system. A reuse scheme is initially defined and resources are allocated to the cells. During operation, changes in the operating conditions of the system are detected and the reuse scheme is redefined as necessary based on the detected changes. For example, the loading conditions of the cells can be detected, and the resources can be reallocated and/or the reuse scheme can be redefined. In yet other aspects, techniques are provided to efficiency schedule data transmissions and to assign channels to users. Data transmissions can be scheduled based on user priorities, some fairness criteria, system requirements, and other factors. Users are assigned to available channels based on a number of channel assignment schemes. Channel metrics are also provided, which can be used to prioritize users and for channel assignments.

公开(公告)号：AT521151T

公开(公告)日：2011-09-15

申请号：AT06719385

申请日：2006-01-24

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  KETCHUM JOHN

IPC: H04L1/00 ,  H04J99/00

Abstract: Techniques to parse data into multiple (M) streams with selectable data rates are described. The modulation scheme and code rate for each stream are determined based on the data rate selected for that stream. The modulation schemes and code rates for all M streams are used to determine a parse cycle and the number of puncture cycles for each stream in the parse cycle. A sequence of puncture cycles is formed for the M streams such that the puncture cycle(s) for each stream are distributed as evenly as possible across the sequence. An encoder encodes traffic data in accordance with a base code (e.g., a rate 1/2 binary convolutional code) and generates code bits. A parser then parses the code bits into the M streams based on the sequence of puncture cycles, one puncture cycle at a time and in the order indicated by the sequence.

公开(公告)号：AT486410T

公开(公告)日：2010-11-15

申请号：AT09169494

申请日：2005-04-29

Applicant: QUALCOMM INC

Inventor： WALTON JAY ,  WALLACE MARK ,  ANTONIO FRANKLIN P ,  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：AT473617T

公开(公告)日：2010-07-15

申请号：AT99953000

申请日：1999-10-01

Applicant: QUALCOMM INC

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

IPC: H04L12/28 ,  H04W72/14 ,  H04B7/005 ,  H04B7/26 ,  H04W52/50

Abstract: A method and apparatus for controlling the transmission of signals from one or more of a plurality of mobile stations (1300) to a base station (1400) on a plurality of M multiple access channels. A power control information packet formed from a plurality of power control bits is transmitted from the base station (1400) to the one or more mobile stations (1300). Each of the power control bits in the power control information packet has a position that is mapped to a selected access channel and to a time offset within the selected access channel. The power control information packet is received at a first mobile station (1300). A message is then transmitted from the first mobile station (1300) to the base station (1400) on a first access channel and at a first time offset associated with the first access channel. The message is transmitted from the first mobile station (1300) at a power level determined in response to a first power control bit in the power control information packet. The first power control bit is located in a first position in the power control information packet, the first position being mapped to the first access channel and the first time offset.

公开(公告)号：AU2003287328C1

公开(公告)日：2009-10-29

申请号：AU2003287328

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON J RODNEY ,  WALLACE MARK ,  HOWARD STEVEN 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: Channel estimation and spatial processing for a TDD MIMO system. Calibration may be performed to account for differences in the responses of transmit/receive chains at the access point and user terminal. During normal operation, a MIMO pilot is transmitted on a first link and used to derive an estimate of the first link channel response, which is decomposed to obtain a diagonal matrix of singular values and a first unitary matrix containing both left eigenvectors of the first link and right eigenvectors of a second link. A steered reference is transmitted on the second link using the eigenvectors in the first unitary matrix, and is processed to obtain the diagonal matrix and a second unitary matrix containing both left eigenvectors of the second link and right eigenvectors of the first link. Each unitary matrix may be used to perform spatial processing for data transmission/reception via both links.