公开(公告)号：AU2004306899B2

公开(公告)日：2008-09-11

申请号：AU2004306899

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  NANDA SANJIV ,  WALTON RODNEY J

IPC: H04B7/005 ,  H04L12/66 ,  H04L29/06

Abstract: 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.

公开(公告)号：AR051643A1

公开(公告)日：2007-01-31

申请号：ARP050104392

申请日：2005-10-20

Applicant: QUALCOMM INC

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

IPC: H04W16/14 ,  H04W24/00 ,  H04W72/02 ,  H04W72/04 ,  H04W76/02 ,  H04Q7/36 ,  H04L12/28

Abstract: realizaciones para métodos de asignacion de banda ancha, detectar interferencia en otros sistemas, y/o re-desplegar en bandas anchas alternativas. Los canales de banda ancha mayores pueden ser desplegados en los límites (104) del canal, que son un subconjunto de aquellos para canales de banda ancha menores (310), y pueden estar restringidos para superponerse. Se puede detectar (930) interferencia en canales primarios, secundarios, o una combinacion de canales, y puede ser detectado en respuesta a mediciones de energía (910) de los diversos canales. Cuando se detecta interferencia, se puede reubicar un conjunto de servicio básico (BSS) de banda ancha mayor (100) en un canal alternativo, o puede reducir su banda ancha para evitar interferencia. La interferencia puede ser detectada basada en la energía medida en el canal primario o secundario y/o una diferencia entre los dos. Un FFT (1010) puede ser usado en la medicion de energía en uno o ambos de los canales primario y secundario. Las estaciones pueden también monitorear mensajes de sistemas alternativos para realizar decisiones de asignacion de canal. También se presentan diversos otros aspectos.

公开(公告)号：HK1091615A1

公开(公告)日：2007-01-19

申请号：HK06107773

申请日：2006-07-11

Applicant: QUALCOMM INC

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

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：AR050795A1

公开(公告)日：2006-11-22

申请号：ARP050103715

申请日：2005-09-05

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/06 ,  H04L1/06

Abstract: Técnicas para transmitir datos utilizando una combinacion de esquemas de diversidad de transmision. Estos esquemas de diversidad de transmision incluyen la distribucion espacial, formacion continua de haces, diversidad de retraso cíclico, diversidad de transmision de espacio-tiempo (STTD), diversidad de transmision de espacio-frecuencia (SFTF), y diversidad de transmision ortogonal (OTD). Una entidad de transmision procesa una o más (ND) corrientes de símbolos de datos basándose en un esquema de diversidad de transmision (es decir, STF, SFTD, o OTD) para generar multiples (NC) corrientes de símbolos codificados. Cada corriente de símbolos de datos puede ser enviada como una unica corriente de símbolos de datos codificados, o como multiples (por ejemplo, dos) corrientes de símbolos de datos codificados utilizando STTD, SFTD, o OTD. La entidad de transmision puede llevar a cabo una distribucion espacial sobre las NC corrientes de símbolos codificados con diferentes matrices, para generar multiples (NT) corrientes de símbolos de transmision para su transmision desde NT antenas. De forma adicional, o como una alternativa, la entidad de transmision puede llevar a cabo una formacion continua de haces sobre las NT corrientes de símbolos de transmision en el dominio de tiempo o el dominio de frecuencia.

公开(公告)号：NO20063055A

公开(公告)日：2006-08-15

申请号：NO20063055

申请日：2006-06-30

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON RODNEY J

IPC: H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L27/26 ,  H04L29/02 ,  H04W28/18 ,  H04W36/00 ,  H04W72/14

CPC classification number: H04L1/06 ,  H04B7/2643 ,  H04L1/0002 ,  H04L1/0025 ,  H04L1/16 ,  H04L25/0204 ,  H04L27/261 ,  H04L2001/0093 ,  H04W24/02 ,  H04W28/18 ,  H04W72/0406 ,  H04W72/14 ,  H04W84/12

Abstract: According to one aspect of the invention, a method is provided in which a control channel used for transmitting control information is partitioned into a plurality of subchannels each of which is operated at a specific data rate. For each of one or more user terminals, one of the subchannels is selected based on one or more selection criteria for transmitting control information from an access point to the respective user terminal. Control information is transmitted from the access point to a user terminal on a particular subchannel selected for the respective user terminal. At the user terminal, one or more subchannels are decoded to obtain control information designated for the user terminal.

公开(公告)号：CA2542380A1

公开(公告)日：2005-04-28

申请号：CA2542380

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： WALTON RODNEY J ,  NANDA SANJIV ,  MEYLAN ARNAUD

IPC: H04L12/56 ,  H04B7/005 ,  H04L29/06 ,  H04W52/38

Abstract: Embodiments disclosed herein for MAC processing for efficient use of high throughput systems and that may be backward compatible with various types of legacy systems. In one aspect, a data transmission structure comprises a consolidated poll and one or more frames transmitted in accordance with the consolidated poll. In another aspect, a Time Division Duplexing (TDD) data transmission structure comprises a pilot, a consolidated poll, and zero or more access point to remote station frames in accordance with the consolidated poll. In one aspect, frames are transmitted sequentially with no or substantially reduced interframe spacing. In another aspect, a guard interframe spacing may be introduced between frames transmitted from different sources, or with substantially different power levels. In another aspect, a single preamble is transmitted in association with one or more frames.; In another aspect, a block acknowledgement is transmitted subsequent to the transmission of one or more sequential frames.

公开(公告)号：CA2502801A1

公开(公告)日：2004-05-06

申请号：CA2502801

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: 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

Abstract: In one embodiment, pilots are transmitted on the downlink and uplink channel s and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on th e estimates of the downlink and uplink channel responses. A calibrated downlin k channel is formed by using a first set of correction factors for the downlin k 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 perform ed in real-time based on over-the-air transmission.