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公开(公告)号：CA2108494C
公开(公告)日：1998-11-24
申请号：CA2108494
申请日：1993-10-15
Applicant: MOTOROLA INC
Inventor： CHIASSON GREGORY MARK , RASKY PHILLIP DAVID , BAUM KEVIN LYNN
Abstract: A radio communication unit for a digital communication system is provided in which an input information signal is protected from transmission errors by forward error correction encoding the information signal. In addition, the communication unit enhances subsequent processing of a transmitted form of the information signal by a hard-limiting receiver by inserting a predetermined synchronization sequence into the information signal. Further, a corresponding radio communication unit is provided which includes a hard limiting mechanism for removing the magnitude of each sample in a group of data samples of a signal received from over a radio communication channel. In addition, weighting coefficients of the hard-limited group of data samples for maximum likelihood decoding and diversity combining are generated by comparing the hard-limited group of data samples to a known predetermined synchronization sequence. Finally, estimated information samples are generated, utilizing the weighting coefficients, by maximum-likelihood decoding the group of data samples.
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公开(公告)号：PT95577B
公开(公告)日：1998-07-31
申请号：PT9557790
申请日：1990-10-12
Applicant: MOTOROLA INC
Inventor： LABEDZ GERALD PAUL , BORTH DAVID EDWARD , RASKY PHILLIP DAVID
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.
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公开(公告)号：CA2075051C
公开(公告)日：1998-06-30
申请号：CA2075051
申请日：1992-02-12
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , RASKY PHILLIP DAVID , LING FUYUN , EYUBOGLU M VEDAT
IPC: H03H15/00 , H03H17/00 , H03H21/00 , H03M13/00 , H03M13/23 , H04B1/10 , H04B1/12 , H04B3/14 , H04B7/005 , H04L1/20
Abstract: A signal weighting system for associating a confidence level with portions of a communication signal transmitted upon a multipath channel and received by a receiver. A signal received by the receiver is equalized by an equalizer circuit, such as a maximum likelihood sequence estimator, and the equalized signal generated thereby is supplied to an adaptive filter which is synthesizes portions of the multipath channel. The signal received by the receiver is altered responsive to values of a filtered, equalized signal generated by the adaptive filter.
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公开(公告)号：PT95577A
公开(公告)日：1992-08-31
申请号：PT9557790
申请日：1990-10-12
Applicant: MOTOROLA INC
Inventor： LABEDZ GERALD PAUL , BORTH DAVID EDWARD , RASKY PHILLIP DAVID
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.
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