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51.发明专利
公开(公告)号：CA2695009A1
公开(公告)日：2009-02-19
申请号：CA2695009
申请日：2008-08-15
Applicant: QUALCOMM INC
Inventor： SARKAR SANDIP , KIM BYOUNG-HOON , MALLADI DURGA PRASAD , MONTOJO JUAN
IPC: H04B7/04
Abstract: Techniques for sending multiple-input multiple-output (MIMO) transmissions in wireless communication systems are described. In one design, a transmitter sends a first reference signal via a first link, e.g., a cell-specific reference signal via the downlink. The transmitter receives channel quality indicator (CQI) information determined by a receiver based on the first reference signal. The transmitter also receives a second reference signal from the receiver via a second link, e.g., a sounding reference signal via the uplink. The transmitter obtains at least one MIMO channel matrix for the first link based on the second reference signal. The transmitter determines at least one precoding matrix based on the at least one MIMO channel matrix, e.g., in accordance with ideal eigen-beamforming or pseudo eigen-beamforming. The transmitter then sends a data transmission to the receiver based on the at least one precoding matrix and the CQI information.
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公开(公告)号：CA2694731A1
公开(公告)日：2009-02-19
申请号：CA2694731
申请日：2008-08-15
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON , MALLADI DURGA PRASAD
Abstract: Systems and methodologies are described that facilitate encoding feedback or control information into a compact payload. In particular, a rank indicator, a precoding matrix indicator and channel quality indicators are packaged into a control channel payload that fits into a single sub-frame. The payload format is determined based at least in part on an antenna configuration or channel quality indicator granularity. In addition, hybrid automatic repeat requests can be included in the payload.
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公开(公告)号：CA2694185A1
公开(公告)日：2009-02-19
申请号：CA2694185
申请日：2008-08-13
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , KIM BYOUNG-HOON , MONTOJO JUAN , SARKAR SANDIP
Abstract: Techniques for sending control information in a wireless communication system are described. In an aspect, a UE spreads control information across frequency with a DFT and across time with an orthogonal sequence to obtain output data for the control information. In one design, the UE receives codewords for N HARQ processes in N downlink subframes, determines an ACK value for each HARQ process, codes N ACK values for the N HARQ processes to obtain ACK information, generates output data for the ACK information, and sends the output data in one of M uplink subframes. In another aspect, first control information is processed based on a first coding and multiplexing scheme utilizing code division multiplexing in time and frequency domains. Second control information is processed based on a second coding and multiplexing scheme utilizing code division multiplexing in time domain and spreading in frequency domain.
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公开(公告)号：AU2008286888A1
公开(公告)日：2009-02-19
申请号：AU2008286888
申请日：2008-08-13
Applicant: QUALCOMM INC
Inventor： MONTOJO JUAN , MALLADI DURGA PRASAD , SARKAR SANDIP , KIM BYOUNG-HOON
Abstract: A method and corresponding apparatus for sending control information in a wireless communication system are described, the method comprising spreading control information across frequency with a discrete Fourier transform to obtain frequency spread data and spreading the frequency spread data across time with an orthogonal sequence to obtain output data for the control information. Also the corresponding method and apparatus for receiving control information are described.
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公开(公告)号：MX2008015803A
公开(公告)日：2009-01-12
申请号：MX2008015803
申请日：2007-06-29
Applicant: QUALCOMM INC
Inventor： XU HAO , KIM BYOUNG-HOON , MALLADI DURGA
Abstract: Se describen sistemas y metodologías que facilitan la conmutación entre varias combinaciones de MIMO, SIMO, SISO y OFDM, LFDM e IFDM; de acuerdo con varios aspectos, se proporciona un método para una red de comunicación inalámbrica que incluye: recibir un primer conjunto de información de datos, en donde el primer conjunto de información comprende un primer valor, determinar si el primer valor está por arriba de un umbral y transmitir una indicación para conmutar a la utilización de una primera técnica de transmisión en caso que se determine que el primer valor está por arriba del umbral.
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Patent Agency Ranking
公开(公告)号：CA2676107A1
公开(公告)日：2008-08-14
申请号：CA2676107
申请日：2008-02-08
Applicant: QUALCOMM INC
Inventor： XU HAO , KIM BYOUNG-HOON
Abstract: Techniques for performing rank-dependent precoding for a MIMO transmissio n are described. Each rank may be associated with a set of at least one prec oding vector or matrix that can provide good performance for that rank. A tr ansmitter may obtain a precoding vector for a rank-1 transmission from a fir st set containing at least one column vector of a unitary matrix, e.g., a Fo urier matrix. The transmitter may perform precoding for the rank-1 transmiss ion based on the precoding vector. The transmitter may obtain a precoding ma trix for a rank-2 transmission from a second set containing an identity matr ix. The transmitter may perform precoding for the rank-2 transmission based on the precoding matrix. For the rank-2 transmission, the transmitter may se lect the identity matrix as the precoding matrix if a MIMO channel resembles a diagonal channel (which may be determined based on antenna configurations ) and may select the unitary matrix otherwise.
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公开(公告)号：CA2675575A1
公开(公告)日：2008-08-14
申请号：CA2675575
申请日：2008-02-06
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , ZHANG XIAOXIA , KIM BYOUNG-HOON
IPC: H04B7/06
Abstract: Techniques for transmitting data using a combination of explicit cyclic d elay and implicit cyclic delay are described. A transmitter may perform fir& lt;=t processing for cyclic delay diversity (or explicit cyclic delay proces sing) based on a first set of cyclic delay values known to a receiver. The t ransmitter may perform precoding based on a precoding matrix either before o r after the explicit cyclic delay processing. The transmitter may perform se cond processing for cyclic delay diversity (or implicit cyclic delay process ing) based on a.second set of cyclic delay values unknown to the receiver. T he transmitter may perform both explicit and implicit cyclic delay processin g for data and may perform only implicit cyclic delay processing for pilot. One entity may. select the first set of cyclic delay values and inform the o ther entity. The transmitter may autonomously (e.g. pseudo-randomly) select the second set of cyclic delay, values without informing the receiver.
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公开(公告)号：AU2008204808A1
公开(公告)日：2008-07-17
申请号：AU2008204808
申请日：2008-01-10
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON , LUO TAO , MALLADI DURGA PRASAD
IPC: H04L27/26
Abstract: Systems and methodologies are described that facilitate searches for a cell in a wireless communication environment. A mobile device can employ a searcher that can detect timing information respectively associated with PSCs and cells to determine the cell with the highest correlation. The searcher can detect SSCs, which can include detecting associated phase information, to determine the SSC with the highest correlation, CP length, and/or other information to facilitate identifying a desired cell having the strongest signal to establish communication between the mobile device and the desired cell. PSCs respectively associated with cells can have different positions in the symbol sequences, and SSCs can respectively be phase shifted at different angles to facilitate detection and identification of a cell(s), where a PSC can be utilized as a phase reference by the associated SSC.
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公开(公告)号：AU2007317484A1
公开(公告)日：2008-05-15
申请号：AU2007317484
申请日：2007-10-31
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , LUO TAO , KIM BYOUNG-HOON , MONTOJO JUAN
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公开(公告)号：CA2798524A1
公开(公告)日：2008-03-20
申请号：CA2798524
申请日：2007-09-13
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , MONTOJO JUAN , LI JUNYI , KIM BYOUNG-HOON
Abstract: Techniques for transmitting synchronization signals to assist user equipments (UEs) perform cell searches are described. In one design, a base station for a cell may generate and transmit a primary synchronization signal and a secondary synchronization signal, which may be used by the UEs for initial cell search at power up. The base station may also generate and transmit one or more beacon signals, which may be used by the UEs for neighbor cell search to detect for neighbor cells. The number of beacon signals to transmit and the set of subcarriers usable for each beacon signal may be determined based on the system bandwidth. Each beacon signal may be mapped to one subcarrier in the set of subcarriers in each beacon symbol period. This one subcarrier may be determined based on a beacon hopping pattern or a beacon code and may be dependent on a cell identifier (ID).
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