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    METHOD AND CIRCUIT FOR SERVICE DETECTION
    1.
    发明专利
    METHOD AND CIRCUIT FOR SERVICE DETECTION 失效

    公开(公告)号：JPH10256942A

    公开(公告)日：1998-09-25

    申请号：JP5006698

    申请日：1998-02-16

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  HONKISZ JENNIFER A ,  STORM BRIAN D

    IPC: H04B7/26 ,  H04Q7/36 ,  H04B1/707

    Abstract: PROBLEM TO BE SOLVED: To surely detect the availability of a CDMA(code division multiple access) service with a simple circuit constitution. SOLUTION: A radio telephone 121 uses a service detection circuit 125 which measures the energy of self-correlation of a reception composite CDMA signal and uses a different time delay for each measurement of the energy and is provided with at least one chip rate detector 109. A threshold detection circuit 127 couples measured energies, and the circuit 127 discriminates that the service is available of coupled energies exceed a threshold, but the circuit 127 discriminates that the service is not available if they don't exceed. Chip rate detectors 109 are coupled in parallel to be able to simultaneously measure the energy of self-correlation of the reception composite CDMA signal, or a single chip rate detector 109 can measure the energy of autocorrelation of the reception composite CDMA signal in series.

    CDMA service detection circuit
    4.
    发明专利
    CDMA service detection circuit 未知

    公开(公告)号：GB2323501A

    公开(公告)日：1998-09-23

    申请号：GB9801291

    申请日：1998-01-20

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  HONKISZ JENNIFER A ,  STORM BRIAN D

    IPC: H04B7/26 ,  H04Q7/36

    Abstract: A radiotelephone 121 employs a service detection circuit 125 comprising at least one chip-rate detector 109 that measures the energy of the autocorrelation of a received composite CDMA signal and employs a different time delay for each measurement of the energy. A threshold detection circuit 127 combines the measured energies and determines that service is available if the combined energies exceeds a threshold, and determines service is unavailable otherwise. The chip-rate detectors 109 can be coupled in parallel to provide simultaneous measurements of the energy of the autocorrelation of the received composite CDMA signal, or a single chip-rate detector 109 can serially measure the energy of the autocorrelation of the received composite CDMA signal.

    CIRCUITO Y METODO DE DETECCION DE SERVICIO.
    9.
    发明专利
    CIRCUITO Y METODO DE DETECCION DE SERVICIO. 未知

    公开(公告)号：MX9801612A

    公开(公告)日：1998-11-30

    申请号：MX9801612

    申请日：1998-02-27

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  HONKISZ JENNIFER A ,  STORM BRIAN D

    IPC: H04B7/26 ,  H04Q7/36 ,  G11B03/00

    Abstract: Un radioteléfono (121) emplea un circuito de deteccion de servicio (125) que comprende al menos un detector de velocidad de chips (109) que mide la energía de la autocorrelacion de una señal de CDMA compuesta recibida y emplea un retardo diferente para cada medicion de la energía. Un circuito de deteccion de umbral (127) combina las energías medidas y determina que el servicio está disponible si las energías combinadas exceden el umbral y de lo contrario, determina que el servicio no está disponible. Los detectores de velocidades de chips (109) pueden conectarse en paralelo para proporcionar mediciones simultáneas de la energía de la autocorrelacion de la señal de CDMA compuesta recibida, o un solo detector de velocidad de chips (109) puede medir en serie la energía de la autocorrelacion de la señal de CDMA compuesta recibida.

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