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102 records (took 0.024 seconds)

    52.
    发明专利
    未知

    公开(公告)号：AT124581T

    公开(公告)日：1995-07-15

    申请号：AT89312184

    申请日：1989-11-23

    Applicant: MOTOROLA INC

    Inventor： DETTRO GREGORY J ,  LABEDZ GERALD PAUL ,  ATKINSON FREDERICK GARLAND

    IPC: H04J3/00 ,  H01J3/02 ,  H01J3/14 ,  H03G3/20 ,  H04J3/10 ,  H04J3/14 ,  H04B7/26

    Abstract: In a communications system having transmissions containing certain information-of-interest (147, 149) at predetermined intervals in the transmission, there is provided a method for isolating and processing that information-of-interest. The method is characterized by sensing the start of a transmission (141) and isolating for processing as the information-of-interest, the information received about instant(s) predeterminally removed in time (145) from the sensed start of transmission (141). Thus, the information-of-interest is isolated principally on the basis of elapsed time. The method for isolating and processing that information-of-interest is further characterized by sensing (249) the start of a transmission from the received signal power of the transmission exceeding a predetermined threshold (259); AGCing the transmission (233) and attenuating the AGC'd transmission from a maximum level to a desired level before the information-of-interest is expected to arrive; isolating for processing as the information-of-interest, the information received about instant(s) predeterminally removed in time from the sensed start of transmission, by timing (263) the expected interval between the instant that the start of the transmission is sensed and the predetermined instant that the information-in-interest should arrive (whereby the information-of-interest is isolated principally on the basis of elapsed time); tagging the information (247) isolated about that instant for processing; and beginning processing (275) with information just preceeding the isolated information (whereby the reliability of the information detection is enhanced by one-to-several bits).

    53.
    发明专利
    未知

    公开(公告)号：AT110503T

    公开(公告)日：1994-09-15

    申请号：AT88117269

    申请日：1988-10-17

    Applicant: MOTOROLA INC

    Inventor： LABEDZ GERALD PAUL ,  BORTH DAVID EDWARD

    IPC: H04L27/38 ,  H04B7/005 ,  H04B7/01 ,  H04B7/26 ,  H04B7/185

    Abstract: The method and apparatus for rapid phase acquisition and random radio channel phase error compensation for a TDMA QPSK receiver is disclosed. Received quadrature signals having a known synchronizing sequence transmitted on one of the vectors is correlated to a local replica of the sequence. The output correlation detection signals are held for the duration of the TDMA timeslot and multiplied by the received quadrature signals to produce two pairs of products. The mutually exclusive product pairs are summed to recover data having the random phase error compensated.

    55.
    发明专利
    未知

    公开(公告)号：PT95871A

    公开(公告)日：1992-10-30

    申请号：PT9587190

    申请日：1990-11-13

    Applicant: MOTOROLA INC

    Inventor： LABEDZ GERALD PAUL ,  ATKINSON FREDERICK G ,  RABE DUANE C ,  SCHULER JOSEPH J ,  WERRONEN ALTON P

    IPC: H04B7/08 ,  H04L1/06 ,  H04B7/00 ,  H04L1/00

    Abstract: A method and apparatus for diversity reception in a communication system is provided. A dual branch receiver (100, 101) is provided with a stored replica of expected reference information (104) so that correlation with received time-dispersed signals produces an estimate of the transmission channel's impulse response as seen by each branch (100, 101), and determines, among other things, phase error between the branch local oscillators (208, 209) and the time-dispersed signals. Matched filters (214, 215) are constructed which then coherently align the time-dispersed signals from each branch (100, 101) with that branch's local oscillator (208, 209) which constitutes a part of the signal equalization. A diversity processor (105) performs bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, followed by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal.

    SOFT DECISION DECODING WITH CHANNEL EQUALIZATION
    56.
    发明专利
    SOFT DECISION DECODING WITH CHANNEL EQUALIZATION 未知

    公开(公告)号：AU6729490A

    公开(公告)日：1991-05-16

    申请号：AU6729490

    申请日：1990-09-24

    Applicant: MOTOROLA INC

    Inventor： LABEDZ GERALD PAUL ,  BORTH DAVID EDWARD ,  RASKY PHILLIP DAVID

    IPC: H04L25/08 ,  H04L25/03 ,  H04L27/00 ,  H04L27/01 ,  H04B3/06

    Abstract: In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information contained in the signal, multiplying with that recovered information the absolute value of that at-least-partly-equalized signal (scaled by a number derived from channel conditions over a time during which at least part of the information to be recovered is distributed), and error-correcting the multiplied information by a Viterbi algorithm channel decoding scheme of error correction. Accordingly, soft decision information is generated from within the equalization process itself.

    57.
    发明专利
    未知

    公开(公告)号：NO885763L

    公开(公告)日：1988-12-27

    申请号：NO885763

    申请日：1988-12-27

    Applicant: MOTOROLA INC

    Inventor： LABEDZ GERALD PAUL

    IPC: H04B7/02 ,  H04W36/18 ,  H04B7/26 ,  H04W36/30 ,  H04W72/08 ,  H04B7/155

    Abstract: A cellular system employing time division messages transmitted from a plurality of radiators (407, 409, 411) in each cell is disclosed. A first electromagnetic signal at a particular frequency is transmitted during one time slot (903) from one of the plurality of radiators. A second electromagnetic signal at the same frequency is transmitted during another time slot (917) from a second one of the plurality of radiators. A remote unit (401,403) selects the best electromagnetic signal and communicates the selection to a cell controller (413), which selects a third time slot for transmission of a message from the radiator transmitting the best electromagnetic signal.

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