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公开(公告)号：DE68914262T2
公开(公告)日：1994-08-11
申请号：DE68914262
申请日：1989-11-23
Applicant: MOTOROLA INC
Inventor： KEPLER JAMES FRANK MICHAEL , BORTH DAVID EDWARD , CERNY FRANK JOSEPH
IPC: H03G3/20 , H04B3/06 , H04B7/005 , H04B7/26 , H04J3/00 , H04J3/16 , H04L27/18 , H04L27/22 , H04L27/38
Abstract: There is provided a method of digital Automatic Gain Control (AGC) in a receiver having limited dynamic range, particularly for discontinuous signals. The method is characterized by detecting the level of a received and AGC'd discontinuous signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver, and adjusting the AGC to establish a desired relationship between the AGC'd signal and the dynamic range limitation. There is also provided a method of handoff in a TDMA cellular-type transmission system utilizing this method of AGControl. The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing (A/D) a received and AGC'd discontinuous signal and converting the digitized samples to a power sample to sense the power of and detect the level of the signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver; and coarsely-adjusting by either progressively attenuating the signal until it falls within the dynamic range of the receiver or by progressively gain-amplifying the signal until it falls within the limited dynamic range of the receiver and finely-adjusting the AGC of the received signal until optimum use of the full (albeit limited) dynamic range of the signal processing stages is about 6-12 dB below maximum to establish a desired relationship between the AGC'd signal and the dynamic range limitation.
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公开(公告)号：DE68914262D1
公开(公告)日：1994-05-05
申请号：DE68914262
申请日：1989-11-23
Applicant: MOTOROLA INC
Inventor： KEPLER JAMES FRANK MICHAEL , BORTH DAVID EDWARD , CERNY FRANK JOSEPH
IPC: H03G3/20 , H04B3/06 , H04B7/005 , H04B7/26 , H04J3/00 , H04J3/16 , H04L27/18 , H04L27/22 , H04L27/38
Abstract: There is provided a method of digital Automatic Gain Control (AGC) in a receiver having limited dynamic range, particularly for discontinuous signals. The method is characterized by detecting the level of a received and AGC'd discontinuous signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver, and adjusting the AGC to establish a desired relationship between the AGC'd signal and the dynamic range limitation. There is also provided a method of handoff in a TDMA cellular-type transmission system utilizing this method of AGControl. The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing (A/D) a received and AGC'd discontinuous signal and converting the digitized samples to a power sample to sense the power of and detect the level of the signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver; and coarsely-adjusting by either progressively attenuating the signal until it falls within the dynamic range of the receiver or by progressively gain-amplifying the signal until it falls within the limited dynamic range of the receiver and finely-adjusting the AGC of the received signal until optimum use of the full (albeit limited) dynamic range of the signal processing stages is about 6-12 dB below maximum to establish a desired relationship between the AGC'd signal and the dynamic range limitation.
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公开(公告)号：ES2047529T3
公开(公告)日：1994-03-01
申请号：ES88117271
申请日：1988-10-17
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , WANG CHIH-FEI , RABE DUANE C , LABEDZ GERALD PAUL
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公开(公告)号：DK101591D0
公开(公告)日：1991-05-28
申请号：DK101591
申请日：1991-05-28
Applicant: MOTOROLA INC
IPC: H03G3/20 , H04B3/06 , H04B7/005 , H04B7/26 , H04J3/00 , H04J3/16 , H04L27/18 , H04L27/22 , H04L27/38 , H04B1/18 , H04L27/08
Abstract: There is provided a method of digital Automatic Gain Control (AGC) in a receiver having limited dynamic range, particularly for discontinuous signals. The method is characterized by detecting the level of a received and AGC'd discontinuous signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver, and adjusting the AGC to establish a desired relationship between the AGC'd signal and the dynamic range limitation. There is also provided a method of handoff in a TDMA cellular-type transmission system utilizing this method of AGControl. The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing (A/D) a received and AGC'd discontinuous signal and converting the digitized samples to a power sample to sense the power of and detect the level of the signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver; and coarsely-adjusting by either progressively attenuating the signal until it falls within the dynamic range of the receiver or by progressively gain-amplifying the signal until it falls within the limited dynamic range of the receiver and finely-adjusting the AGC of the received signal until optimum use of the full (albeit limited) dynamic range of the signal processing stages is about 6-12 dB below maximum to establish a desired relationship between the AGC'd signal and the dynamic range limitation.
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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
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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Patent Agency Ranking
公开(公告)号：PT92601A
公开(公告)日：1990-06-29
申请号：PT9260189
申请日：1989-12-15
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , KEPLER JAMES FRANK MICHAEL
IPC: H04L27/00 , H04L27/14 , H04L27/18 , H04L27/227 , H03L
Abstract: There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier (25), detecting the frequency difference between the carrier frequency and the phase of the reference oscillator (30), and adjusting (80) the frequency of the reference oscillator (35) to eliminate the frequency difference ( DELTA ). It is further characterized by digitizing (40) the modulated carrier in quadrature, sampling (20) the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 (25/55/60) to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting (30) the frequency difference ( DELTA ) between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator (35) with a phase trajectory estimator (45), and establishing and generating the requisite correction voltage ( DELTA ) for a Voltage Controlled type of reference oscillator (VCO) (35) with the phase trajectory estimator (45).
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47.发明专利
公开(公告)号：CA2087520C
公开(公告)日：1998-12-22
申请号：CA2087520
申请日：1992-05-07
Applicant: MOTOROLA INC
Inventor： MUELLER BRUCE DALE , BAUM KEVIN LYNN , BORTH DAVID EDWARD , WINTER ERIC HELMUT , RASKY PHILLIP DAVID
IPC: H04B3/04 , H04B7/00 , H04B7/005 , H04B7/08 , H04L1/02 , H04L25/06 , H04L27/01 , H04L27/22 , H04B1/10 , H04L1/20
Abstract: A system and method for correcting for Rayleigh interference of a signal transmitted upon a multi-path channel. The system adaptively calculates values of channel gain and noise variance of the channel upon which the signal is transmitted, and generates signals indicative of such calculations which are supplied to a decoder. The system may be utilized to form a portion of a coherent, or noncoherent receiver which receives encoded and differentially-encoded signals
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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：ES2107410T3
公开(公告)日：1997-12-01
申请号：ES89122616
申请日：1989-12-11
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , KEPLER JAMES FRANK MICHAEL
Abstract: There is provided a method of and apparatus for Automatice Frequency Control (AFC) of pure sine waves (PSW). It is characterized by discriminating to detect frequency differences between a received pure sine wave and a reference frequency (20), integrating (30) the frequency differences to average the differences, and adjusting (40) the reference frequency (80) to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave (70), mixing (50) the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering (60) the mixed sine wave, cross-product discrimination (20) to detect frequency differences between a received pure sine wave and a reference frequency, integration (30) the frequency differences to average the differences, selectively (100/110) calculating the mean/variance (90) between the pure sine wave and the reference frequency, and adjusting (40) the reference frequency of a Voltage Controlled Oscillator 80 to eliminate the frequency difference.
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