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    11.
    发明专利
    未知

    公开(公告)号：AT152559T

    公开(公告)日：1997-05-15

    申请号：AT89902364

    申请日：1988-12-21

    Applicant: QUALCOMM INC

    Inventor： GILHOUSEN KLEIN S ,  ANTONIO FRANKLIN P ,  JACOBS IRWIN M ,  WEAVER LINDSAY A JR

    IPC: G02B6/293 ,  G02B6/34 ,  G02B6/42 ,  H01S3/08 ,  H01S5/14 ,  H01S5/40 ,  H04B1/7136 ,  H04B7/212 ,  H04B10/155 ,  H04L5/16 ,  H04B7/26 ,  H04J3/26

    Abstract: A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal to one or more mobile terminals and at least one mobile terminal having a second transceiver for receiving the first communication signal and demodulating it, and for transmitting at a predetermined duty cycle of the second transceiver, a second communication signal to at least one of the central communication stations. The preferred duty cycle over which the second communication signal is transmitted is about fifty percent of the second transceiver duty cycle. The communication system uses Time Division Multiplexed (TDM) communication signals using a number of channels as designated address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by terminals to determine both the presence of a message and its corresponding data transmission or reception channel. In addition the terminals use the reception of the first communication signal to adjust return link transmission frequency to compensate for transmission path errors. The alternating duty cycle allows mobile terminals to use a single set of local oscillators for both transmission and reception modes of operation. To decrease interference with other systems the present system employs a power dispersal modulation function to achieve the footprint of a video signal for high transfer rate digital communication signals.

    MULTIPLEXED ADDRESS CONTROL IN A TDM COMMUNICATION SYSTEM
    13.
    发明专利
    MULTIPLEXED ADDRESS CONTROL IN A TDM COMMUNICATION SYSTEM 未知

    公开(公告)号：AU612253B2

    公开(公告)日：1991-07-04

    申请号：AU3349489

    申请日：1988-12-21

    Applicant: QUALCOMM INC

    Inventor： GILHOUSEN KLEIN S ,  ANTONIO FRANKLIN P ,  JACOBS IRWIN M

    IPC: H04B7/212 ,  H04J3/00 ,  H04J3/16 ,  H04J3/24 ,  H04Q7/06 ,  H04Q7/08 ,  H04Q7/12 ,  H04Q7/18 ,  H04Q7/38 ,  H04B7/26

    Abstract: A message communication system employing one or more centralized communication stations transmitting messages through Earth orbit relay satellites to mobile receivers utilizing Time Division Multiplexed (TDM) communication signals having signal time frames divided into a series of transmission channels. A predetermined number of the channels are designated as address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by receivers to determine both the presence of a message and its corresponding data transmission channel. Each system receiver scans, and tracks only the communication signal address channels until a message addressed to that receiver is detected, at which time the selected receiver changes channels to the designated data channel for reception of the message. Thus, demodulation of the entire communication signal is not required and processing time and power is reduced for the typical waiting condition when messages are not being received. While a message is being received only a portion of the communication signal need to be received, demodulated and decoded. The decoded message is then displayed on a display screen or similar device for the recipient.

    DUAL SATELLITE NAVIGATION METHOD AND SYSTEM
    14.
    发明专利
    DUAL SATELLITE NAVIGATION METHOD AND SYSTEM 未知

    公开(公告)号：CA2073053A1

    公开(公告)日：1991-06-06

    申请号：CA2073053

    申请日：1990-11-30

    Applicant: QUALCOMM INC

    Inventor： AMES WILLIAM G ,  JACOBS IRWIN M ,  WEAVER LINDSAY A JR ,  GILHOUSEN KLEIN S

    IPC: G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185 ,  G01S5/10

    Abstract: A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.

    SISTEMA Y PROCEDIMIENTO PARA GENERAR FORMAS DE ONDA DE SEÑAL EN UN SISTEMA TELEFONICO CELULAR CDMA.
    16.
    发明专利
    SISTEMA Y PROCEDIMIENTO PARA GENERAR FORMAS DE ONDA DE SEÑAL EN UN SISTEMA TELEFONICO CELULAR CDMA. 未知

    公开(公告)号：ES2288650T3

    公开(公告)日：2008-01-16

    申请号：ES04012940

    申请日：1991-06-21

    Applicant: QUALCOMM INC

    Inventor： GILHOUSEN KLEIN S ,  WEAVER LINDSAY A JR ,  JACOBS IRWIN M

    IPC: H04L27/30 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/005 ,  H04B7/26 ,  H04J3/02 ,  H04J3/16 ,  H04J3/22 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/18 ,  H04L20060101 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04W52/26

    Abstract: Un sitio de célula de acceso múltiple por división de código (12, 14) (sitio de célula CDMA), para un sistema CDMA que tenga un esquema de transferencia suave que permita la conmutación entre sitios de célula (12, 14) según dicte la intensidad de la señal a la vez que se mantiene una conexión a al menos un sitio de célula (12), en el que el sitio de célula (12) está configurado para transmitir una señal portadora piloto para obtener la sincronización inicial y para mantener un seguimiento robusto de la temporización, y en el que para cada sector de una célula del sistema CDMA, se usa el mismo código de expansión pero con un desplazamiento en el tiempo que es usado para la señal portadora piloto, y en el que el sitio de celda comprende: * un medio para modular (66) configurado para formatear los datos digitales para la transmisión sobre un canal de comunicaciones y para insertar al menos una orden de temporización dentro de los datos digitales, comprendiendo los datos digitales una pluralidad de bits; * un medio para transmitir (58) acoplado al medio para modular 66 y configurado para recibir los datos digitales desde los medios para modular, convertir los datos digitales en datos analógicos y para transmitir los datos analógicos sobre el canal de comunicaciones; y * un medio para recibir (32, 36) configurado para recibir una señal desde al menos una unidad remota (16, 18) y para determinar un error de temporización de la señal recibida para ser usada para generar la orden de temporización de acuerdo con el error de temporización, estando el medio para recibir (32, 36) acoplado al medio para modular (66) y configurado para proporcionar la orden de temporización al medio para modular (66).

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