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公开(公告)号：ITRM920121D0
公开(公告)日：1992-02-24
申请号：ITRM920121
申请日：1992-02-24
Applicant: MOTOROLA INC
Inventor： RASKY PHILLIP D , BORTH DAVID E , LING FUYUN , EYUBOGLU M VEDAT
IPC: H03H15/00 , H03H17/00 , H03H21/00 , H03M13/00 , H03M13/23 , H04B1/10 , H04B1/12 , H04B3/14 , H04B7/005
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：CA1294073C
公开(公告)日：1992-01-07
申请号：CA575635
申请日：1988-08-25
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , WANG CHIH-FEI , RABE DUANE C , LABEDZ GERALD P
Abstract: CE00027R TDMA RADIO SYSTEM EMPLYING BPSK SYNCHRONIZATION FOR QPSK SIGNALS SUBJECT TO RANDOM PHASE VARIATION AND MULTIPATH FADING of the Invention A time division multiple access (TDMA) radio system conveying a quadrature phase shift keying (QPSK) modulated data signal is disclosed. In order to overcome multipath distortion and phase variation introduced by the radio channel, a synchronizing portion of a TDMA timeslot is transmitted in only one veotor of the QPSK modulation. The system utilizes the one vector synchronizing portion to develop a channel profile estimate which is applies to the received message portion of the QPSK data signal to compensate for the multipath distortion and phase variation during one TDMA timeslot.
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公开(公告)号：NO905055D0
公开(公告)日：1990-11-22
申请号：NO905055
申请日：1990-11-22
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , KEPLER JAMES F
IPC: H04L27/38 , H03J7/02 , H03L20060101 , H03L7/00 , H03L7/087 , H04B7/26 , H04L27/00 , H04L27/227 , H03L
Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.
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公开(公告)号：FR2746990B1
公开(公告)日：2001-10-26
申请号：FR9703405
申请日：1997-03-20
Applicant: MOTOROLA INC
Inventor： LING FUYUN , BORTH DAVID E , FRANK COLIN D , RASKY PHILLIP D , KEPLER JAMES F
Abstract: A receiver circuit (400, 500) receives a spread spectrum communication signal, such as a DS-CDMA signal, including a pilot channel and including a power control designator. The signal is despread and decoded. The pilot symbols on the pilot channel are provided to a channel estimator (408) for estimating the channel phase and channel gain of the communication channel. This estimate is provided to a demodulator (422) for demodulating the traffic channel symbols. The pilot symbols are provided to another channel estimator (410) for estimating channel phase and channel gain for the power control designator. This estimate is provided to a demodulator (424) for demodulating the power control designator. The traffic channel symbols are delayed a predetermined time in a delay element (420) before demodulating. The power control designator is delayed a short time or not at all in a short delay element (418) before demodulation.
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公开(公告)号：BR9307417A
公开(公告)日：1999-08-31
申请号：BR9307417
申请日：1993-10-07
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , HAUG JOHN R , RASKY PHILLIP D , CHIASSON GREGORY M
Abstract: A dual mode radio communication unit for a digital communication system is provided having an error controller including an error detection encoder and a forward error correction encoder which encode an input information signal into an error protected data bit stream. In addition, the communication unit includes a mode selector which enables either the error detection encoder or the forward error correction encoder used with a particular mode of operation of the communication unit. Further, a corresponding dual mode radio communication unit is provided having an error controller for generating estimated information signal samples according to a group of algorithms consisting of either an error detection algorithm or an error correction algorithm. In addition, the corresponding communication unit includes a mode selector for receiving a signal according to a particular one of the group of algorithms which is associated with a particular mode of operation of the corresponding communication unit.
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Patent Agency Ranking
公开(公告)号：DE19712830A1
公开(公告)日：1997-11-06
申请号：DE19712830
申请日：1997-03-26
Applicant: MOTOROLA INC
Inventor： LING FUYUN , BORTH DAVID E , FRANK COLIN D , RASKY PHILLIP D , KEPLER JAMES F
Abstract: A receiver circuit (400, 500) receives a spread spectrum communication signal, such as a DS-CDMA signal, including a pilot channel and including a power control designator. The signal is despread and decoded. The pilot symbols on the pilot channel are provided to a channel estimator (408) for estimating the channel phase and channel gain of the communication channel. This estimate is provided to a demodulator (422) for demodulating the traffic channel symbols. The pilot symbols are provided to another channel estimator (410) for estimating channel phase and channel gain for the power control designator. This estimate is provided to a demodulator (424) for demodulating the power control designator. The traffic channel symbols are delayed a predetermined time in a delay element (420) before demodulating. The power control designator is delayed a short time or not at all in a short delay element (418) before demodulation.
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公开(公告)号：FR2746990A1
公开(公告)日：1997-10-03
申请号：FR9703405
申请日：1997-03-20
Applicant: MOTOROLA INC
Inventor： LING FUYUN , BORTH DAVID E , FRANK COLIN D , RASKY PHILLIP D , KEPLER JAMES F
Abstract: A receiver circuit (400, 500) receives a spread spectrum communication signal, such as a DS-CDMA signal, including a pilot channel and including a power control designator. The signal is despread and decoded. The pilot symbols on the pilot channel are provided to a channel estimator (408) for estimating the channel phase and channel gain of the communication channel. This estimate is provided to a demodulator (422) for demodulating the traffic channel symbols. The pilot symbols are provided to another channel estimator (410) for estimating channel phase and channel gain for the power control designator. This estimate is provided to a demodulator (424) for demodulating the power control designator. The traffic channel symbols are delayed a predetermined time in a delay element (420) before demodulating. The power control designator is delayed a short time or not at all in a short delay element (418) before demodulation.
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公开(公告)号：DE69030892D1
公开(公告)日：1997-07-17
申请号：DE69030892
申请日：1990-03-23
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , KEPLER JAMES F
IPC: H04L27/38 , H03J7/02 , H03L20060101 , H03L7/00 , H03L7/087 , H04B7/26 , H04L27/00 , H04L27/227 , H03L7/093 , H04B7/212
Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.
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公开(公告)号：GB2266036B
公开(公告)日：1995-06-28
申请号：GB9310894
申请日：1992-08-14
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , MUELLER BRUCE D , BAUM KEVIN L
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公开(公告)号：FI952262A
公开(公告)日：1995-05-10
申请号：FI952262
申请日：1995-05-10
Applicant: MOTOROLA INC
Inventor： BORTH DAVID E , HAUG JOHN R , RASKY PHILLIP D , CHIASSON GREGORY M
IPC: G06F11/10 , H03M13/23 , H03M13/27 , H04B7/26 , H04L1/00 , H04L1/02 , H04L1/06 , H04W88/06 , H04B , H04L
Abstract: A dual mode radio communication unit (102, 104) for a digital communication system is provided having an error controller including an error detection encoder (111) and a forward error correction encoder (112) which encode an input information signal into an error protected data bit stream. In addition, the communication unit includes a mode selector which enables either the error detection encoder or the forward error correction encoder used with a particular mode of operation of the communication unit. Further, a corresponding dual mode radio communication unit is provided having an error controller for generating estimated information signal samples according to a group of algorithms consisting of either an error detection algorithm (261) or an error correction algorithm (202). In addition, the corresponding communication unit includes a mode selector (141) for receiving a signal according to a particular one of the group of algorithms which is associated with a particular mode of operation of the corresponding communication unit.
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