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    24.
    发明专利
    未知

    公开(公告)号：BR9608463A

    公开(公告)日：1998-12-29

    申请号：BR9608463

    申请日：1996-04-22

    Applicant: QUALCOMM INC

    Inventor： WOLF JACK K ,  SCHIFF LEONARD N ,  ZEHAVI EPHAIM

    IPC: H04B7/15 ,  H04J3/24 ,  H04J11/00 ,  H04J13/00 ,  H04L1/00 ,  H04L12/28 ,  H04L12/56 ,  H04W72/04

    Abstract: A variable rate transmission system wherein a packet of variable rate data generated by a variable rate data source is modulated on traffic channel by traffic channel modulator if the capacity of the traffic channel is capable of transmitting the packet. And where the packet of variable rate data is modulated onto traffic channel by traffic channel modulator and at least one overflow channel by traffic channel modulator, if the capacity of the traffic channel is less than required to transmit the packet. A receiving system for receiving variable rate data transmitted in accordance with the above.

    METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONCATENATED CODE DATA
    25.
    发明专利
    METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONCATENATED CODE DATA 未知

    公开(公告)号：CA2274772A1

    公开(公告)日：1998-07-23

    申请号：CA2274772

    申请日：1997-12-19

    Applicant: QUALCOMM INC

    Inventor： WOLF JACK K

    IPC: H03M13/15 ,  H03M13/29 ,  H03M13/41 ,  H03M13/47 ,  H04L1/00 ,  H04L1/16 ,  H03M13/00

    Abstract: In a concatenated code data, correctly decoded code words from a block decoder is utilized to improve the performance of the convolutional decoder. A code word can sometimes be correctly decoded prior to receipt of all the symbols for the code word. Early decoding of the code word allows for the correct recreation of the entire code word, even the symbols which have not yet been received. The entire corrected code word is used by the convolutional decoder to eliminate branches from the trellis, thus improving decoding of prior data bits and future data bits in the trellis. The chain back distance of the convolutional decoder can also be made shorter based on the knowledge that some of the received code words have been correctly decoded. Finally, the parity symbols which have not yet been received for the correctly decoded code word can be eliminated from transmission to improve the overall transmission rate.

    SECTORIZACION ADAPTABLE EN UN SISTEMA DE COMUNICACION DE ESPECTRO DIFUNDIDO.
    26.
    发明专利
    SECTORIZACION ADAPTABLE EN UN SISTEMA DE COMUNICACION DE ESPECTRO DIFUNDIDO. 未知

    公开(公告)号：MX9606634A

    公开(公告)日：1997-12-31

    申请号：MX9606634

    申请日：1995-06-22

    Applicant: QUALCOMM INC

    Inventor： ANTONIO FRANKLIN P ,  GILHOUSEN KLEIN S ,  WOLF JACK K ,  ZEHAVI EPHRAIM

    IPC: H01Q3/26 ,  H01Q3/24 ,  H04B1/7085 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/26 ,  H04L1/06 ,  H04W16/28 ,  H04B07/26

    Abstract: Un sistema y método para la sincronizacion adaptable de recursos de canal dentro de un sistema de comunicacion celular digital. El sistema utiliza una instalacion de antena para proporcionar al menos el primero y segundo haz electromagnético para recibir una primera señal de informacion transmitida por uno específico de una pluralidad de usuarios (22), generado mediante esto la primera y segunda señales recibidas. Un primer conjunto de señales formadoras de haz se generan entonces a partir de las señales recibidas primera y segunda mediante una red formadora de haz (224) y una matriz de conmutador (228). Se proporcionan receptores de demodulacion (230) para demodular al menos las señales formadoras de haz, primera y segunda, incluidas dentro del primer conjunto de señales formadoras de haz, produciendo mediante esto señales demoduladoras, primera y segunda. El sistema incluye además una red de seguimiento (240) para el seguimiento de las señales de informacion de multiples trayectorias, recibidas de diferentes posiciones y ángulos de incidencia.

    27.
    发明专利
    未知

    公开(公告)号：BR9407595A

    公开(公告)日：1997-01-07

    申请号：BR9407595

    申请日：1994-09-23

    Applicant: QUALCOMM INC

    Inventor： KINDRED DANIEL R ,  BUTLER BRIAN K ,  ZEHAVI EPHRAIM ,  WOLF JACK K

    IPC: H04L1/12 ,  H03M13/23 ,  H03M13/37 ,  H03M13/41 ,  H04B1/707 ,  H04L1/00 ,  H04L1/08 ,  H04L1/20 ,  H04L25/02 ,  H04L25/03 ,  H04L25/08 ,  H04B7/26 ,  H03M13/00

    Abstract: A Viterbi decoder for recovering the original bit data stream that was convolutionally encoded as a code symbol stream in a Code Division Multiple Access (CDMA) mobile communication system. The decoder simultaneously decodes at the several data rates associated with certain multirate vocoders. The decoder can decode at an unknown data rate in either continuous or framed packet modes. It accomplishes this by simultaneously decoding at multiple rates and by creating one or more data quality metrics for each decoded data packet. Special input and output buffering is provided to isolate the decoder from system timing constraints. The input buffer includes selection and accumulation logic to organize code symbol data into the packet order for repeat mode or random burst mode at lower frame data rates. Decoded data packets for each of several predetermined data transfer rates are held in an output buffer for about half of the decoding cycle, thereby permitting the system microprocessor to examine and select the appropriate decoded data packet. The decoder also can be reconfigured to operate at any one of several predetermined convolutional encoding algorithms. The Viterbi decoder, implemented as a single monolithic integrated circuit, can be used in any and all of many different multiuser telecommunications channels.

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