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    CODE DIVISION MULTIPLEXED ACKNOWLEDGE BACK PAGING SYSTEM
    21.
    发明专利
    CODE DIVISION MULTIPLEXED ACKNOWLEDGE BACK PAGING SYSTEM 未知

    公开(公告)号：CA1289622C

    公开(公告)日：1991-09-24

    申请号：CA583329

    申请日：1988-11-17

    Applicant: MOTOROLA INC

    Inventor： SIWIAK KAZIMIERZ

    IPC: G08B3/10 ,  H04B7/26 ,  H04J13/00 ,  H04J13/18 ,  H04W84/02 ,  H04Q9/00

    Abstract: An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to an group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective papers thus providing ack-back data. The payers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back signals using different respective pseudorandom code , a different pseudorandom code being dynamically allocated to each of the pagers in the group.

    COMPRESSION OF MULTIPLE SUBCHANNEL VOICE SIGNALS
    26.
    发明专利
    COMPRESSION OF MULTIPLE SUBCHANNEL VOICE SIGNALS 未知

    公开(公告)号：NZ301168A

    公开(公告)日：1998-01-26

    申请号：NZ30116896

    申请日：1996-01-11

    Applicant: MOTOROLA INC

    Inventor： LEITCH CLIFFORD DANA ,  SCHWENDEMAN ROBERT JOHN ,  SIWIAK KAZIMIERZ ,  KUZNICKI WILLIAM JOSEPH ,  SATYAMURTI SUNIL

    IPC: G10L19/00 ,  H04B1/66 ,  H04J1/14

    Abstract: The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system (100). The method comprises the steps of subchanneling the voice communication resource into a plurality of subchannels (441, 442, 443), placing a pair of the plurality of voice signals (401, 402) on a subchannel (441); modulating the pair of the plurality of voice signals (401, 402) about a pilot signal (581) within the subchannel (441) using single sideband modulation; and compressing the time of each of the voice signals (401, 402) within the plurality of subchannels (441, 442, 443), wherein these step provide a compressed voice signal.

    Frequency division multiplexed acknowledge back paging system
    27.
    发明专利
    Frequency division multiplexed acknowledge back paging system 未知

    公开(公告)号：HK119797A

    公开(公告)日：1997-09-05

    申请号：HK119797

    申请日：1997-06-26

    Applicant: MOTOROLA INC

    Inventor： SIWIAK KAZIMIERZ ,  JASINSKI LEON ,  STEEL FRANCIS ROBERT

    IPC: H04W84/02 ,  H04Q7/00

    Abstract: An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group.

    30.
    发明专利
    未知

    公开(公告)号：DE3854434T2

    公开(公告)日：1996-04-18

    申请号：DE3854434

    申请日：1988-12-12

    Applicant: MOTOROLA INC

    Inventor： SIWIAK KAZIMIERZ ,  KEBA JAMES ,  STEEL FRANCIS ROBERT

    IPC: G08B5/36 ,  B63B21/48 ,  G08B3/10 ,  H04L1/18 ,  H04W84/02 ,  G08B5/22

    Abstract: An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group. To accurately control the ack-back transmit frequency, the pager receives and down-converts the FRX signal thus producing a down-converted FC signal, the frequency of which is measured and stored. The pager selects which sub-band of a plurality of frequency sub-bands within a predetermined range of frequencies is to be used for transmission of the ack-back signal. The pager determines a frequency offset FD corresponding to the selected sub-band, such offset being with respect to a predetermined frequency within such range of frequencies. The pager generates an acknowledge back signal at a frequency (FC+FD)-FCTX and up-converts such signal to a transmit frequency FTX corresponding to said selected sub-band, FCTX being the frequency of a down-converted sample of the FTX signal.

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