公开(公告)号：CA2596092A1

公开(公告)日：2006-08-03

申请号：CA2596092

申请日：2006-01-27

Applicant: QUALCOMM INC

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

IPC: H04B7/005 ,  H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L5/14 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: Techniques are described to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one method, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Correction factors for the access point and correction factors for the user terminal are determined based on (e.g., by performing matrix-ratio computation or minimum mean square error (MMSE) computation on) the downlink and uplink channel response estimates. The correction factors for the access point and the correction factors for the user terminal are used to obtain a calibrated downlink channel and a calibrated uplink channel, which are transpose of one another. The calibration may be performed in real time based on over-the-air transmission.

公开(公告)号：CA2731491A1

公开(公告)日：2006-05-26

申请号：CA2731491

申请日：2005-11-15

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  SURINENI SHRAVAN K ,  MEYLAN ARNAUD ,  NANDA SANJIV

IPC: H04B7/12 ,  H04B1/76 ,  H04B7/02 ,  H04B17/00 ,  H04J99/00 ,  H04W24/00

Abstract: Techniques for performing open-loop rate control in a TDD communication system are described. The channel quality of a first link is estimated based on a transmission received via the first link. The channel quality of a second link is estimated based on the estimated channel quality of the first link and an asymmetric parameter. At least one rate for a data transmission via the second link is selected based on the estimated channel quality of the second link. The estimated channel quality for each link may be given by a set of SNR estimates for a set of transmission channels on that link. The asymmetric parameter may be determined based on (1) the capabilities (e.g., transmit power, receiver noise figure, and number of antennas) of the transmitting and receiving stations or (2) received SNRs for the first and second links.

公开(公告)号：CA2547112A1

公开(公告)日：2005-06-16

申请号：CA2547112

申请日：2004-11-15

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W

IPC: H04L12/28 ,  H04B7/06 ,  H04B7/26 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/56 ,  H04L25/02 ,  H04L27/26 ,  H04W28/18 ,  H04W36/00 ,  H04W72/14

公开(公告)号：AU2004310994A1

公开(公告)日：2005-06-16

申请号：AU2004310994

申请日：2004-11-24

Applicant: QUALCOMM INC

Inventor： NANDA SANJIV ,  WALTON J RODNEY

IPC: H04L12/28 ,  H04L12/56 ,  H04L47/20 ,  H04L47/2475 ,  H04L47/30 ,  H04L47/56 ,  H04L47/6275 ,  H04L47/765 ,  H04L47/80 ,  H04W8/18 ,  H04W28/18 ,  H04W28/26 ,  H04W72/04 ,  H04W72/12

Abstract: In one aspect of the invention, a communication device, operable with a plurality of remote devices, and operable with an admission profile comprising a capacity reservation for zero or more remote devices, comprises a scheduler for determining if a remote device corresponding to the data transmission indicator has a capacity reservation in the admission profile and for allocating capacity in accordance with the data transmission indicator. In another aspect, data indicators correspond to one or more service levels. Remaining capacity may be allocated in priority of increasing size of data transmission requirement. In yet another aspect, an admission profile is updated to accept a new flow, characterized by flow parameters, in accordance with available system capacity. Various other aspects are also presented.

公开(公告)号：CA2787842A1

公开(公告)日：2005-06-09

申请号：CA2787842

申请日：2004-11-12

Applicant: QUALCOMM INC

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

IPC: H04B7/02 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36

公开(公告)号：AU2004310663A1

公开(公告)日：2005-06-09

申请号：AU2004310663

申请日：2004-11-12

Applicant: QUALCOMM INC

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

IPC: H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36

公开(公告)号：CA2542643A1

公开(公告)日：2005-04-28

申请号：CA2542643

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： NANDA SANJIV ,  WALTON J RODNEY

IPC: H04L12/06 ,  H04B7/005 ,  H04L12/28 ,  H04L12/56 ,  H04L12/66 ,  H04L29/06 ,  H04L29/08 ,  H04W52/38 ,  H04W72/04 ,  H04W72/12

Abstract: Techniques for MAC processing for efficient use of high throughput systems that may be backward compatible with various types of legacy systems are disclosed. In one aspect, a data frame is formed comprising a common portion for transmission in a format receivable by various stations, such as access points and remote stations. The data frame also comprises a dedicated portion, formatted for transmission to a specified remote station. In another aspect, the common portion is unsteered, and the dedicated portion is steered. In another aspect, an access point schedules an allocation in response to a data indication included in a common portion of a data frame transmitted from one remote station to another. In another aspect, a first station transmits a reference to a second station, which measures the reference and generates feedback therefrom.

公开(公告)号：AU2003287328A1

公开(公告)日：2004-05-13

申请号：AU2003287328

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALLACE MARK ,  WALTON J RODNEY ,  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 ,  H04B7/00

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.

公开(公告)号：CA2502804A1

公开(公告)日：2004-05-06

申请号：CA2502804

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  WALTON J RODNEY ,  KETCHUM JOHN W ,  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 (512). During normal operation, a MIMO pilot is transmitted on a first link (522) and used to derive an estimate of the first link channel response (524), which is decomposed to obtain a diagonal matrix of singular values and a first unitar y matrix containing both left eigenvectors of the first link and right eigenvectors of a second link (526). A steered reference is transmitted on t he second link using the eigenvectors in the first unitary matrix (530), and is processed to obtain the diagonal matrix and a second unitary matrix containi ng both left eigenvectors of the second link and right eigenvectors of the firs t link (532). Each unitary matrix may be used to perform spatial processing fo r data transmission/reception via both links (540, 542, 550, 552).

公开(公告)号：WO2007143472A3

公开(公告)日：2008-02-21

申请号：PCT/US2007069967

申请日：2007-05-30

Applicant: QUALCOMM INC ,  SURINENI SHRAVAN K ,  WALTON J RODNEY ,  WALLACE MARK ,  HOWARD STEVEN J

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

IPC: H04L12/28 ,  H04B7/06 ,  H04L1/16 ,  H04L12/56

CPC classification number: H04B7/0636 ,  H04B7/0417 ,  H04B7/0634 ,  H04L1/1671

Abstract: Techniques for quickly sending feedback information for beamforming are described. A transmitter/initiator sends a first frame comprising training symbols. A receiver/responder receives the first frame, determines the amount of time to generate feedback information, and determines the amount of time to send the feedback information. The receiver then determines the length of a second frame carrying the feedback information based on the amounts of time to generate and send the feedback information. The receiver sends the second frame after waiting a short interframe space (SIFS) period from the end of the first frame, without performing channel access. The receiver generates the feedback information based on the training symbols and sends the information in the second frame when ready. The transmitter receives the second frame, derives at least one steering matrix based on the feedback information, and sends a third frame with the at least one steering matrix.

Abstract translation: 描述了用于快速发送用于波束成形的反馈信息的技术。 发射机/发起者发送包括训练符号的第一帧。 接收器/响应器接收第一帧，确定产生反馈信息的时间量，并确定发送反馈信息的时间量。 然后，接收机基于生成和发送反馈信息的时间量确定承载反馈信息的第二帧的长度。 接收机在等待来自第一帧结束的短帧间间隔（SIFS）周期之后发送第二帧，而不执行信道接入。 接收机根据训练符号生成反馈信息，并在准备就绪时发送第二帧中的信息。 所述发射机接收所述第二帧，基于所述反馈信息导出至少一个导引矩阵，并且发送具有所述至少一个导引矩阵的第三帧。