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公开(公告)号：CA2614469C
公开(公告)日：2012-05-22
申请号：CA2614469
申请日：2006-07-06
Applicant: QUALCOMM INC
Inventor： DRAVIDA SUBRAHMANYAM , WALTON JAY RODNEY , NANDA SANJIV , SURINENI SHRAVAN K
Abstract: Embodiments describe utilizing time-based information to improve communication in a wireless network. A method can include receiving beacon information from at least one access point and utilizing time-stamp information associated with the beacon information to determine whether to hand off communication with a second access point. According to other embodiments the method can further include detecting beacon quality is below a threshold level and transmitting a poor beacon quality message. Information relating to a plurality of alternate access points can be received in response to the transmitted poor beacon quality message.
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公开(公告)号：CA2609423C
公开(公告)日：2012-05-15
申请号：CA2609423
申请日：2006-05-24
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , WALLACE MARK S
Abstract: Techniques for detecting and demodulating a signal/transmission are described. Signal detection is performed in multiple stages using different types of signal processing, e.g., using time-domain correlation for a first stage, frequency-domain processing for a second stage, and time-domain processing for a third stage. For the first stage, products of symbols are generated for at least two different delays, correlation between the products for each delay and known values is performed, and correlation results for all delays are combined and used to declare the presence of a signal. For demodulation, the timing of input samples is adjusted to obtain timing-adjusted samples. A frequency offset is estimated and removed from the timing-adjusted samples to obtain frequency-corrected samples, which are processed with a channel estimate to obtain detected symbols. The phases of the detected symbols are corrected to obtain phase-corrected symbols, which are demodulated, deinterleaved, and decoded.
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公开(公告)号：PT2207387E
公开(公告)日：2012-03-06
申请号：PT10004523
申请日：2006-10-05
Applicant: QUALCOMM INC
Inventor： KUMAR RAVI , WALTON JAY RODNEY , FU QIANG , DRAVIDA SUBRAHMANYAM
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公开(公告)号：ES2373662T3
公开(公告)日：2012-02-07
申请号：ES04814424
申请日：2004-12-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , ZHENG LIZHONG , KETCHUM JOHN W , WALLACE MARK S , HOWARD STEVEN J
Abstract: Un procedimiento de provisión de datos para su transmisión en un sistema de comunicación inalámbrica de múltiple entrada y múltiple salida MIMO, comprendiendo el procedimiento: procesar datos (112, 114) para obtener al menos un bloque de símbolos de datos; dividir (114) el al menos un bloque de símbolos de datos en una pluralidad de sub-bloques de símbolos de datos; seleccionar (118) una matriz de orientación para cada sub-bloque de símbolos de datos; procesar espacialmente (118, 120) el al menos un bloque de símbolos de datos con una pluralidad de matrices de orientación para obtener una pluralidad de secuencias de símbolos de transmisión, correspondiendo cada secuencia a un sub-bloque diferente del al menos un bloque de símbolos de datos, en el que procesar espacialmente el al menos un bloque de símbolos de datos comprende procesar espacialmente cada sub-bloque de símbolos de datos con la matriz de orientación seleccionada para ese sub-bloque; proporcionar (122) la pluralidad de secuencias de símbolos de transmisión a una pluralidad de antenas de transmisión para su transmisión, en el que la pluralidad de matrices de orientación aleatorizan un canal MIMO efectivo observado por una entidad de recepción para el al menos un bloque de símbolos de datos realizando el procesamiento espacial con la pluralidad de matrices de orientación.
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公开(公告)号：ES2373568T3
公开(公告)日：2012-02-06
申请号：ES06825603
申请日：2006-10-05
Applicant: QUALCOMM INC
Inventor： KUMAR RAVI , WALTON JAY RODNEY , FU QIANG , DRAVIDA SUBRAHMANYAM
Abstract: Un aparato para realizar el descubrimiento en una comunicación de igual a igual, que comprende: un medio para encender periódicamente un primer dispositivo inalámbrico (130c) configurado para monitorizar, recibir o enviar una trama a, o desde, un segundo dispositivo inalámbrico (130d), en donde la trama es una trama baliza e incluye un identificador para el dispositivo inalámbrico remitente, en donde el medio para encender está configurado para encender el primer dispositivo inalámbrico (130c) periódicamente durante intervalos temporales seleccionados de forma seudoaleatoria; un medio para extraer el identificador de la trama recibida desde el segundo dispositivo inalámbrico; un medio para determinar si el identificador extraído está incluido en una lista de identificadores; y un medio para enviar una respuesta al segundo dispositivo inalámbrico (130d) si el identificador extraído está incluido en la lista.
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Patent Agency Ranking
公开(公告)号：PT1932293E
公开(公告)日：2012-01-12
申请号：PT06825603
申请日：2006-10-05
Applicant: QUALCOMM INC
Inventor： KUMAR RAVI , WALTON JAY RODNEY , FU QIANG , DRAVIDA SUBRAHMANYAM
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77.发明专利
公开(公告)号：CA2556710C
公开(公告)日：2011-12-20
申请号：CA2556710
申请日：2005-02-18
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J
Abstract: The downlink and uplink are calibrated to account for differences in the responses of transmit and receive chains at an access point and a user terminal. For initial calibration, the access point and user terminal transmit MIMO pilots on the downlink and uplink, which are used to derive channel estimates including the responses of the applicable transmit/receive chains. Correction matrices (a) and (b) are derived based on these channel estimates and thereafter used by the access point and user terminal, respectively. For follow-on calibration, one entity transmits a MIMO pilot and a steered reference. The other entity derives a first transmit matrix based on the steered reference and a second transmit matrix based on the MIMO pilot and calibration error matrices (c) and (d), which contain estimates of the errors in (a) and (b), respectively. (c) and (d) may be iteratively adjusted based on an adaptive procedure to minimize the errors between the two transmit matrices.
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公开(公告)号：AU2009200283B2
公开(公告)日：2011-03-03
申请号：AU2009200283
申请日：2009-01-27
Applicant: QUALCOMM INC
Inventor： KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J , WALLACE MARK S
Abstract: For data transmission with spatial spreading, a transmitting entity (1) encodes and modulates each data packet to obtain a corresponding data symbol block, (2) multiplexes data symbol blocks onto N S data symbol streams for transmission on N S transmission channels of a MIMO channel, (3) spatially spreads the N S data symbol streams with steering matrices, and (4) spatially processes N S spread symbol streams for full-CSI transmission on N S eigenmodes or partial-CSI transmission on N S spatial channels of the MIMO channel. A receiving entity (1) obtains N R received symbol streams via N R receive antennas, (2) performs receiver spatial processing for full-CSI or partial-CSI transmission to obtain N S detected symbol streams, (3) spatially despreads the N S detected symbol streams with the same steering matrices used by the transmitting entity to obtain N S recovered symbol streams, and (4) demodulates and decodes each recovered symbol block to obtain a corresponding decoded data packet.
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公开(公告)号：BRPI0612773A2
公开(公告)日：2010-11-30
申请号：BRPI0612773
申请日：2006-07-06
Applicant: QUALCOMM INC
Inventor： DRAVIDA SUBRAHMANYAM , NANDA SANJUV , SURINENI SHRAVAN K , WALTON JAY RODNEY
Abstract: Embodiments describe methods, systems, and devices that utilize positional information to determine location of other device and/or to provide a location-based message. A method can include receiving a location information of a mobile device and using an access point to transmit location information to one or more other devices that do not include location functionality that are in communication with the mobile device. The method can further include transmitting a message to the mobile device based at least in part on the received access location information. In another embodiment, the method can include receiving a user preference data from the mobile device or one or more other devices and transmitting a communication to the mobile device or one or more other devices that conforms to the user preference data.
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公开(公告)号：BRPI0612089A2
公开(公告)日：2010-10-19
申请号：BRPI0612089
申请日：2006-06-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA
Abstract: Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.
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