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公开(公告)号：JPH11168448A
公开(公告)日：1999-06-22
申请号：JP27432698
申请日：1998-09-10
Applicant: MOTOROLA INC
Inventor： LAROSA CHRISTOPHER P , CARNEY MICHAEL J , BECKER CHRISTOPHER J , EBERHARDT MICHAEL A , FRANK COLIN D , RASKY PHILLIP D
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117 , H04J13/00
Abstract: PROBLEM TO BE SOLVED: To provide a lake receiver and a finger managing method improved for providing the merit of path diversity even when the interval of multipath radio waves is shorter than one-chip time. SOLUTION: A lake receiver 112 is provided with plural fingers 122, 124 and 128. Each finger is provided with a demodulator for demodulating the radio waves of multiple path signals and a time tracking circuit for controlling the timewise position of the finger based on the timewise position of the radio wave. Low delay spreading conditions are detected, the positions of two adjacent fingers are controlled and fingers more than two are prevented from being converged around a common timewise position. By maintaining the timing intervals of fingers, even during low delay spreading conditions, the path diversity is effectively utilized by the lake receiver 112 and the performance of the receiver is improved.
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公开(公告)号：JPH1065611A
公开(公告)日：1998-03-06
申请号：JP12806597
申请日：1997-05-01
Applicant: MOTOROLA INC
Inventor： EBERHARDT MICHAEL A
Abstract: PROBLEM TO BE SOLVED: To precisely demodulate a power control bit and a traffic bit with simple configuration in the mobile station of a spread spectrum communication system. SOLUTION: A communication device comprises a plurality of receiver fingers receiving spread spectrum communication signals. The respective receiver fingers contain reception signal intensity indication (RSSI) circuits 400. The RSSI circuit contains an energy computer 406 and filters 410 and 412 and it generates a filter signal showing signal quality. A first comparator 414 generates a primary locking indication when the filter signal exceeds a primary locking threshold. A second comparator 418 generates a secondary locking indication when the filter signal exceeds a secondary locking threshold. The band width of the RSSI circuit is changed between first band width providing the primary locking indication of a traffic channel decoder and second band width providing the secondary locking indication of a power control bit decoder and performance is adjusted to the decoding request of respective channels.
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公开(公告)号：ITRM980585A1
公开(公告)日：2000-03-13
申请号：ITRM980585
申请日：1998-09-11
Applicant: MOTOROLA INC
Inventor： RASKY PHILLIP D , LAROSA CHRISTOPHER P , CARNEY MICHAEL J , BECKER CRISTOPHER , EBERHARDT MICHAEL A , FRANK COLIN
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117
Abstract: A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.
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公开(公告)号：GB2317077B
公开(公告)日：1998-11-11
申请号：GB9716298
申请日：1997-08-04
Applicant: MOTOROLA INC
Inventor： KRAUSE DAVID J , STORM BRIAN D , TARANOWSKI WILLIAM F , EBERHARDT MICHAEL A
Abstract: An apparatus (100) maintains a Pilot Set in a digital communication system that utilizes Code Division Multiple Access. The apparatus comprises a logic and control circuit (113) for providing instructions to a searcher receiver (109). The searcher receiver, in response to the instructions, sequentially scans active pilots, then candidate pilots, and then pre-candidate pilots. The scan of the pre-candidate pilots continues until all but a predetermined number of pre-candidate pilots have been promoted or demoted. Then the searcher receiver alternately scans the predetermined number of pre-candidate pilots and the neighbor pilots. The searcher receiver terminates alternate scans of the predetermined number of pre-candidate pilots and the neighbor pilots when a one of the neighbor pilots is promoted, and resumes the scan of the pre-candidate pilots.
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5.发明专利
公开(公告)号：GB2313023A
公开(公告)日：1997-11-12
申请号：GB9708602
申请日：1997-04-29
Applicant: MOTOROLA INC
Inventor： EBERHARDT MICHAEL A
Abstract: A communication device (100) includes a plurality of receiver fingers (112, 114, 116) for receiving a spread spectrum communication signal. Each receiver finger includes a received signal strength indication (RSSI) circuit (400). The RSSI circuit (400) includes an energy calculator (406) and a filter (410, 412) for producing a filtered signal which indicates signal quality. A first comparator (414) produces a primary lock indication when the filtered signal exceeds a primary lock threshold. A second comparator (418) produces a secondary lock indication when the filtered signal exceeds a secondary lock threshold. The bandwidth of the RSSI circuit (400) can be varied between a first bandwidth for providing the primary lock indication for traffic channel decoder and a second bandwidth for providing the secondary lock indication for the power control bit decoder. This allows performance to be tailored to the individual requirements of the traffic channel decoding and the power control channel decoding.
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Patent Agency Ranking
公开(公告)号：FR2768576B1
公开(公告)日：2004-10-29
申请号：FR9810128
申请日：1998-08-06
Applicant: MOTOROLA INC
Inventor： LAROSA CHRISTOPHER P , CARNEY MICHAEL J , BECKER CHRISTOHER J , EBERHARDT MICHAEL A , FRANK COLIN D , RASKY PHILLIP D
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117 , H04B1/69 , H04B7/216
Abstract: A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.
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公开(公告)号：FR2748363B1
公开(公告)日：2003-08-22
申请号：FR9704609
申请日：1997-04-15
Applicant: MOTOROLA INC
Inventor： EBERHARDT MICHAEL A
Abstract: A communication device (100) includes a plurality of receiver fingers (112, 114, 116) for receiving a spread spectrum communication signal. Each receiver finger includes a received signal strength indication (RSSI) circuit (400). The RSSI circuit (400) includes an energy calculator (406) and a filter (410, 412) for producing a filtered signal which indicates signal quality. A first comparator (414) produces a primary lock indication when the filtered signal exceeds a primary lock threshold. A second comparator (418) produces a secondary lock indication when the filtered signal exceeds a secondary lock threshold. The bandwidth of the RSSI circuit (400) can be varied between a first bandwidth for providing the primary lock indication for traffic channel decoder and a second bandwidth for providing the secondary lock indication for the power control bit decoder. This allows performance to be tailored to the individual requirements of the traffic channel decoding and the power control channel decoding.
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公开(公告)号：AU735531B2
公开(公告)日：2001-07-12
申请号：AU7861798
申请日：1998-07-31
Applicant: MOTOROLA INC
Inventor： LAROSA CHRISTOPHER P , CARNEY MICHAEL J , BECKER CHRISTOPHER J , EBERHARDT MICHAEL A , FRANK COLIN D , RASKY PHILLIP D
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117 , H04J13/04 , H04B7/216
Abstract: A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.
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公开(公告)号：BR9803430A
公开(公告)日：1999-11-03
申请号：BR9803430
申请日：1998-09-11
Applicant: MOTOROLA INC
Inventor： ROSA CRISTOPHER P LA , CARNEY MICHAEL J , BECKER CHRISTOPHER J , EBERHARDT MICHAEL A , FRANK COLIN D , RASKY PHILLIP D
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117 , H04Q7/22
Abstract: A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.
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公开(公告)号：DE19841148A1
公开(公告)日：1999-04-01
申请号：DE19841148
申请日：1998-09-09
Applicant: MOTOROLA INC
Inventor： LAROSA CHRISTOPHER P , CARNEY MICHAEL J , BECKER CHRISTOPHER J , EBERHARDT MICHAEL A , FRANK COLIN D , RASKY PHILLIP D
IPC: H04B1/7113 , H04B1/7115 , H04B1/7117 , H04J13/02
Abstract: The provision of time control systems for individual teeth of circuit ensures separation of spread spectral components The comb type receiver (112) comprises a number of teeth (122,124,126, 128). Each tooth comprises a demodulator (402) for demodulating the beam of a signal with multiple channels, and a time tracking circuit (404) for controlling the time position of the tooth as a function of the time position of the beam. A state of weak detected spread delay, and the positions of two adjacent teeth are controlled to prevent the convergence of two or several teeth about a common time position. By maintaining the time difference of the teeth, the diversity of the channels is used by the comb type receiver in a weak spread delay state to improve the performance of the receiver.
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