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    Multipath search processor for a spread spectrum multiple access communication system
    101.
    发明专利
    Multipath search processor for a spread spectrum multiple access communication system 未知

    公开(公告)号：AU688625B2

    公开(公告)日：1998-03-12

    申请号：AU3945195

    申请日：1995-09-27

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D ,  LEVIN JEFFREY A

    IPC: H04L1/02 ,  H04B1/707 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L27/30 ,  H04Q7/20

    Abstract: An integrated search processor used in a modem for a spread spectrum communications system buffers receive samples and utilizes a time sliced transform processor operating on successive offsets from the buffer. The search processor autonomously steps through a search as configured by a microprocessor specified search parameter set, which can include the group of antennas to search over, the starting offset and width of the search window to search over, and the number of Walsh symbols to accumulate results at each offset. The search processor calculates the correlation energy at each offset, and presents a summary report of the best paths found in the search to use for demodulation element reassignment. This reduces the searching process related workload of the microprocessor and also reduces the modem costs by allowing a complete channel element modem circuit to be produced in a single IC.

    102.
    发明专利
    未知

    公开(公告)号：NO975996L

    公开(公告)日：1998-02-18

    申请号：NO975996

    申请日：1997-12-19

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D

    IPC: H04B1/7115 ,  H04B1/7117 ,  H04B7/26

    Abstract: The present invention involves demodulating a signal in a spread spectrum multiple access system employing a pilot on the forward link. The rake receiver separates the signal processing based on the period over which the processing occurs. Symbol rate processing is performed by a single time-shared multiply-accumulate datapath that services multiple finger front ends and a searcher front end. The front ends are dedicated circuits that perform all chip rate processing, producing a data vector and asserting a flag indicating the results are ready to be serviced by the shared datapath. A datapath controller arbitrates use of the datapath between the finger front ends, the searcher front end, and combining functions, configuring the datapath to service them on a first-come, first-serve basis. The controller sequences the datapath through a fixed routine as dictated by the signal processing associated with the block being serviced.

    ROM-BASED FINITE IMPULSE RESPONSE FILTER FOR USE IN MOBILE TELEPHONE
    103.
    发明专利
    ROM-BASED FINITE IMPULSE RESPONSE FILTER FOR USE IN MOBILE TELEPHONE 未知

    公开(公告)号：CA2254929A1

    公开(公告)日：1997-12-31

    申请号：CA2254929

    申请日：1997-06-23

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D ,  BLACK PETER J

    IPC: H03H17/06

    Abstract: The finite impulse response (FIR) filter (20) is implemented as a table (104) using read-only memory (ROM). The FIR filter table stores a pre-calculated output filter value for each permissible combination of input values (102) to be filtered. Streams of input values are successively shifted into the table using a shift register (106) and corresponding output values are successively output. The telephone employs a data burst randomizer (18) to provide a data signal composed of sequences of null or 0 values and sequences of antipodal values (+1's and -1's). Hence, the permissible input combinations for the FIR filter include only patterns containing either all antipodal signals, all null signals, leading antipodal signals followed by trailing null signals, or leading null signals followed by trailing antipodal signals. The FIR filter look up is configured to exploit these limitations on the input streams yielding a look up table having relatively few entries.

    PROCESADORA DE BUSQUEDA POR TRAYECTORIAS MULTIPLES PARA UN SISTEMA DE COMUNICACION DE ACCESO MULTIPLE Y ESPECTRO DISPERSADO.
    105.
    发明专利
    PROCESADORA DE BUSQUEDA POR TRAYECTORIAS MULTIPLES PARA UN SISTEMA DE COMUNICACION DE ACCESO MULTIPLE Y ESPECTRO DISPERSADO. 未知

    公开(公告)号：MX9602026A

    公开(公告)日：1997-03-29

    申请号：MX9602026

    申请日：1995-09-27

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D ,  LEVIN JEFFREY A

    IPC: H04L1/02 ,  H04B1/707 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L27/30 ,  H04Q7/20 ,  H04B07/26

    Abstract: Un procesador de busqueda integrado utilizado en un modem para sistema de comunicacion con espectro disperso en que se reciben muestras en tampones y en que se utiliza un procesador transformador de períodos de tiempo que opera en desplazamiento sucesivos a partir del tampon. El procesador de busqueda pasa automáticamente por una busqueda como ha sido configurada por un microprocesador con un conjunto de parámetros de busqueda específicos, que puede incluir al grupo de antenas sujetas a busqueda, un desplazamiento de arranque y un ancho de la ventana de busqueda para someterse a busqueda así como el numero de símbolos de Walsh que sirven para acumular los resultados en cada desplazamiento. El procesador de busqueda calcula la energía de la correlacion en cada desplazamiento y presenta un informe resumido de las mejores trayectorias encontradas en la busqueda para ser aprovechadas para fines de reasignacion del elemento de desmodulacion. Esto reduce la carga de trabajo del microprocesador por lo que se refiere al proceso de busqueda y también disminuye los costos del modem, ya que se permite que se produzca en un solo circuito integrado un circuito de modem con elemento de canal completo.

    Rake receiver architecture for a mobile demodulator used in a cdma communication system
    106.
    发明专利
    Rake receiver architecture for a mobile demodulator used in a cdma communication system 未知

    公开(公告)号：AU6477796A

    公开(公告)日：1997-01-22

    申请号：AU6477796

    申请日：1996-06-18

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D

    IPC: H04B1/7115 ,  H04B1/7117 ,  H04B7/26

    Abstract: The present invention involves demodulating a signal in a spread spectrum multiple access system employing a pilot on the forward link. The rake receiver separates the signal processing based on the period over which the processing occurs. Symbol rate processing is performed by a single time-shared multiply-accumulate datapath that services multiple finger front ends and a searcher front end. The front ends are dedicated circuits that perform all chip rate processing, producing a data vector and asserting a flag indicating the results are ready to be serviced by the shared datapath. A datapath controller arbitrates use of the datapath between the finger front ends, the searcher front end, and combining functions, configuring the datapath to service them on a first-come, first-serve basis. The controller sequences the datapath through a fixed routine as dictated by the signal processing associated with the block being serviced.

    RAKE RECEIVER ARCHITECTURE FOR A MOBILE DEMODULATOR USED IN A CDMA COMMUNICATION SYSTEM
    107.
    发明专利
    RAKE RECEIVER ARCHITECTURE FOR A MOBILE DEMODULATOR USED IN A CDMA COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2224934A1

    公开(公告)日：1997-01-09

    申请号：CA2224934

    申请日：1996-06-18

    Applicant: QUALCOMM INC

    Inventor： EASTON KENNETH D

    IPC: H04B1/7115 ,  H04B1/7117 ,  H04B1/69 ,  H04B7/204 ,  H04Q7/22

    Abstract: The present invention involves demodulating a signal in a spread spectrum multiple access system employing a pilot on the foward link. The rake receiver (10) separates the signal processing based on the period over which the processing occurs. Symbol rate processing is performed by a single time-shared mutiply-accumulate datapath (34) that services multiple finger front ends (312) and a searcher front end (314). The front ends (312) are dedicated circuits that perform all chip rate processing, producing a data vector and asserting a flag indicating the results are ready to be serviced by the shared datapath. A datapath controller (308) arbitrates use of the datapath between the finger front ends (312), the searcher front end (314), and combining functions, configuring the datapath to service them on a first-come, firstserve basis. The controller (308) sequences the datapath through a fixed routine as dictated by the signal processing associated with the block being serviced.

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