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公开(公告)号：MY105777A
公开(公告)日：1995-01-30
申请号：MYPI19891442
申请日：1989-10-19
Applicant: MOTOROLA INC
IPC: H03G3/20 , H04L27/14 , 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 (FIG. 3) 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 (FIG. 3) 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 (FIG. 3) 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.(FIG 3)
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公开(公告)号：FI92118C
公开(公告)日：1994-09-26
申请号：FI870642
申请日：1987-02-16
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , GERSON IRA ALAN , VILMUR RICHARD JOSEPH , SMANSKI PHILIP JEROME
IPC: G10K11/178 , G10L21/0208 , G10L21/0216 , G10L25/27 , H03G3/34 , H04R25/00 , H04R27/00
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公开(公告)号：MX171792B
公开(公告)日：1993-11-15
申请号：MX2277090
申请日：1990-10-10
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：FI87712B
公开(公告)日：1992-10-30
申请号：FI884939
申请日：1988-10-26
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：PT92600A
公开(公告)日：1990-06-29
申请号：PT9260089
申请日：1989-12-15
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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Patent Agency Ranking
公开(公告)号：FI884941A
公开(公告)日：1989-06-05
申请号：FI884941
申请日：1988-10-26
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , WANG CHI-FEI , RABE DUANE C , LABEDZ GERALD PAUL
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公开(公告)号：FI884940A
公开(公告)日：1989-06-05
申请号：FI884940
申请日：1988-10-26
Applicant: MOTOROLA INC
Inventor： LABEDZ GERALD PAUL , BORTH DAVID EDWARD
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.
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公开(公告)号：IE80652B1
公开(公告)日：1998-11-04
申请号：IE402689
申请日：1989-12-15
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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公开(公告)号：PT92600B
公开(公告)日：1998-05-29
申请号：PT9260089
申请日：1989-12-15
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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公开(公告)号：GR3024917T3
公开(公告)日：1998-01-30
申请号：GR970402339
申请日：1997-10-02
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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