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51. 发明专利

DE60331198D1 未知
公开(公告)号：DE60331198D1
公开(公告)日：2010-03-25
申请号：DE60331198
申请日：2003-10-24
申请人： QUALCOMM INC
发明人： WALTON RODNEY J , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC分类号： H04W16/28 , 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
摘要： 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.

52. 发明专利

AU2003287293C1 Correction for differences between downlink and uplink channel responses 未知
公开(公告)号：AU2003287293C1
公开(公告)日：2009-09-24
申请号：AU2003287293
申请日：2003-10-24
申请人： QUALCOMM INC
发明人： HOWARD STEVEN J , KETCHUM JOHN W , WALTON RODNEY J , WALLACE MARK
IPC分类号： H04J99/00 , H04B7/005 , 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
摘要： Techniques 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 embodiment, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on the estimates of the downlink and uplink channel responses. A calibrated downlink channel is formed by using a first set of correction factors for the downlink channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be performed in real time based on over-the-air transmission.

53. 发明专利

BRPI0607131A2 未知
公开(公告)号：BRPI0607131A2
公开(公告)日：2009-08-04
申请号：BRPI0607131
申请日：2006-01-27
申请人： QUALCOMM INC
发明人： WALLACE MARK S , KETCHUM JOHN W , WALTON RODNEY J , HOWARD STEVEN J
IPC分类号： 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
摘要： 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.

54. 发明专利

AU2003287293B2 Correction for differences between downlink and uplink channel responses 未知
公开(公告)号：AU2003287293B2
公开(公告)日：2009-04-23
申请号：AU2003287293
申请日：2003-10-24
申请人： QUALCOMM INC
发明人： HOWARD STEVEN J , KETCHUM JOHN W , WALTON RODNEY J , WALLACE MARK
IPC分类号： H04J99/00 , H04L25/02 , H04B7/005 , H04B7/04 , H04B7/06 , H04B7/08 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L5/14 , H04L12/28 , H04L12/56 , H04L25/03 , H04L27/26
摘要： Techniques 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 embodiment, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on the estimates of the downlink and uplink channel responses. A calibrated downlink channel is formed by using a first set of correction factors for the downlink channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be performed in real time based on over-the-air transmission.

55. 发明专利

MX2007004872A OPERACION EN BANDA DE FRECUENCIA MULTIPLE EN REDES INALAMBRICAS. 未知
公开(公告)号：MX2007004872A
公开(公告)日：2007-07-04
申请号：MX2007004872
申请日：2005-10-20
申请人： QUALCOMM INC
发明人： NANDA SANJIV , WALTON RODNEY J , SURINENI SHRAVAN K
IPC分类号： H04L12/00 , H04W16/14 , H04W24/00 , H04W72/02 , H04W72/04 , H04W76/02
摘要： Se describen modalidades para metodos de asignacion de ancho de banda, detectar interferencia con otros sistemas, y/o re-desplegar en ancho de banda alterno; los canales de ancho de banda superior pueden ser desplegados en limites de canal (410), los cuales son un subconjunto de aquellos para canales de ancho de banda inferior (310), y se pueden restringir contra el traslape; la interferencia se puede detectar (930) en canales primarios, secundarios o una combinacion de canales, y se puede detectar en respuesta a mediciones de energia (910) de varios canales; cuando se detecta la interferencia, un Conjunto de Servicio de Ancho de Banda Basico (BSS) (100) superior se puede reasignar a un canal alterno, o puede tener su ancho de banda reducido para evitar interferencia; la interferencia se puede detectar en base en la energia medida en el canal primario o secundario, y/o una diferencia entre los dos; se puede utilizar una FFT (1010) en la medicion de energia en cualquiera o ambos de los canales primario y secundario; las estaciones tambien pueden monitorear mensajes provenientes de sistemas alternos para tomar decisiones de asignacion de canal; tambien se presentan otros diversos aspectos.

56. 发明专利

HK1091618A1 MIMO WLAN SYSTEM MIMO WLAN 未知
公开(公告)号：HK1091618A1
公开(公告)日：2007-01-19
申请号：HK06107813
申请日：2006-07-12
申请人： QUALCOMM INC
发明人： WALTON RODNEY J , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC分类号： H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , H04L20060101 , 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
摘要： 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.

57. 发明专利

BR0315677A 未知
公开(公告)号：BR0315677A
公开(公告)日：2005-09-06
申请号：BR0315677
申请日：2003-10-24
申请人： QUALCOMM INC
发明人： WALTON RODNEY J , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC分类号： 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
摘要： 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.

58. 发明专利

BR0315664A 未知
公开(公告)号：BR0315664A
公开(公告)日：2005-08-30
申请号：BR0315664
申请日：2003-10-24
申请人： QUALCOMM INC
发明人： WALTON RODNEY J , WALLACE MARK S
IPC分类号： H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L25/02 , H04L25/03 , H04L27/00 , H04L27/26 , H04W28/20 , H04W52/50
摘要： Techniques for detecting and demodulating data transmissions in wireless communication systems. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot symbols. The decision-directed detector may be designed to perform differential detection in the frequency domain or coherent detection in the time domain, and may be used with multi-carrier modulation (e.g., OFDM). In another aspect, an adaptive threshold is used to perform detection of received data transmissions. A threshold may be determined for each data transmission hypothesized to have been received. The threshold may be computed, for example, based on the signal plus noise energy of the hypothesized data transmission.

59. 发明专利

AU2004306899A1 High speed media access control with legacy system interoperability 未知
公开(公告)号：AU2004306899A1
公开(公告)日：2005-04-28
申请号：AU2004306899
申请日：2004-10-15
申请人： QUALCOMM INC
发明人： KETCHUM JOHN W , NANDA SANJIV , WALTON RODNEY J
IPC分类号： H04L12/66 , H04B7/005 , H04L29/06
摘要： Techniques for MAC processing for efficient use of high throughput systems that is backward compatible with various types of legacy systems arc disclosed. In one aspect a first signal is transmitted according to a legacy transmission format to reserve a portion of a shared medium, and communication according to a second transmission format transpires during the reserved portion. In another aspect, a communication device may contend for access on a legacy system, and then communicate according to a new class communication protocol with one or more remote communication devices during the access period. In another aspect, a device may request access to a shared medium according to a legacy protocol, and, upon grant of access, the device may communicate with or facilitate communication between one or more remote stations according to a new protocol.

60. 发明申请

WO2007137280A3 DERIVATION AND FEEDBACK OF A TRANSMIT STEERING MATRIX 审中-公开
标题翻译：发送转向矩阵的衍生和反馈
公开(公告)号：WO2007137280A3
公开(公告)日：2008-04-17
申请号：PCT/US2007069498
申请日：2007-05-22
申请人： QUALCOMM INC , HOWARD STEVEN J , KETCHUM JOHN W , WALLACE MARK S , WALTON RODNEY J
发明人： HOWARD STEVEN J , KETCHUM JOHN W , WALLACE MARK S , WALTON RODNEY J
IPC分类号： H04L1/06
CPC分类号： H01Q21/00 , H04B7/0404 , H04B7/0417 , H04B7/0634 , H04B7/066 , H04L1/0675
摘要： 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.
摘要翻译：描述了用于有效地导出发射导向矩阵并发送该矩阵的反馈的技术。接收机确定定义要用于从发射机到接收机的传输的发射导引矩阵的一组参数。接收机可以基于一组变换矩阵来导出发射导向矩阵，该组矩阵可用于Jacobi旋转的多次迭代以将信道矩阵的非对角线元素归零。然后，接收机可以基于变换矩阵来确定参数集合。对于每个变换矩阵，该组参数可以包括至少一个角度，至少一个值，至少一个索引等。接收机将定义发射导向矩阵（而不是发射导向矩阵的元素）的参数集合发送到发射机以供发射机使用以导出发射导向矩阵。

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