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公开(公告)号：CA2062776C
公开(公告)日：1996-06-04
申请号：CA2062776
申请日：1991-04-09
Applicant: MOTOROLA INC
Inventor： ARENS JOHN WILLIAM , BORTH DAVID EDWARD , KEPLER JAMES FRANK MICHAEL
Abstract: There is provided a mechanism for Automatic Gain Control in a receiver. It comprises: determining, within a certain dynamic range, the difference in power between the desired signal and a signal received, and providing open loop gain control for the signal in response to the differential so determined, scaled by the receiver's gain characteristics, such that the signal is positioned within dynamic range so as to reduce saturation and noise.
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公开(公告)号：ES2075844T3
公开(公告)日：1995-10-16
申请号：ES89121747
申请日：1989-12-11
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , KEPLER JAMES FRANK MICHAEL
IPC: H04L27/14 , H04L27/00 , H04L27/18 , H04L27/227 , H04L27/22
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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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：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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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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Patent Agency Ranking
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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公开(公告)号：ES2050819T3
公开(公告)日：1994-06-01
申请号：ES89312183
申请日：1989-11-23
Applicant: MOTOROLA INC
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：MY104494A
公开(公告)日：1994-04-30
申请号：MYPI19891789
申请日：1989-12-16
Applicant: MOTOROLA INC
Inventor： BORTH DAVID EDWARD , KEPLER JAMES FRANK MICHAEL
Abstract: THERE IS PROVIDED A METHOD OF AND APPARATUS FOR AUTOMATIC 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 DISCRIMINATING (20) TO DETECT FREQUENCY DIFFERENCES BETWEEN A RECEIVED PURE SINE WAVE AND A REFERENCE FREQUENCY, INTEGRATING (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. (FIG. 1)
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公开(公告)号：PT92433A
公开(公告)日：1990-05-31
申请号：PT9243389
申请日：1989-11-28
Applicant: MOTOROLA INC
IPC: H03G3/20 , H04B3/06 , H04B7/005 , H04B7/26 , H04J3/00 , H04J3/16 , H04L27/18 , H04L27/22 , H04L27/38 , H03G , H04J
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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