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公开(公告)号：AU8185591A
公开(公告)日：1992-01-07
申请号：AU8185591
申请日：1991-05-30
Applicant: MOTOROLA INC
Inventor： JASPER STEVEN C , BUTLER JAMES A
Abstract: In a QAM communications system (10, 60), a novel synchronizing sequence of vectors (S11, S12,...S1n; S21, S22,...S2n; S31, S32,...S3n; S41, S42,...S4n) added to the information channels (32, 34, 36, 38) simplify acquisition of timing and synchronization by a receiver (60). Such synchronization vectors (S11, S12,...S1n; S21, S22,...S2n; S31, S32,...S3n; S41, S42,...S4n) provide signals for improved AFC control signal generation.
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公开(公告)号：AU7956891A
公开(公告)日：1992-01-07
申请号：AU7956891
申请日：1991-05-30
Applicant: MOTOROLA INC
Inventor： JASPER STEVEN C , BIRCHLER MARK A
Abstract: A method for implementing diversity reception to counteract effects of channel fading on a transmitted information signal. In diversity receive paths, estimates of complex channel gain are computed based upon pilot symbols inserted from time to time in the transmitted information symbol stream. Phase corrected and weighted samples from the diversity paths are summed prior to the decision process. The squared magnitudes of the diversity path channel gains are summed to provide the proper threshold adjustment.
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公开(公告)号：CA2064758A1
公开(公告)日：1991-12-13
申请号：CA2064758
申请日：1991-05-17
Applicant: MOTOROLA INC
Inventor： JASPER STEVEN C
Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references (402) for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.
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