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公开(公告)号：DE69131715T2
公开(公告)日：2000-04-27
申请号：DE69131715
申请日：1991-11-07
Applicant: MOTOROLA INC
Inventor： CRISLER KENNETH , HIBEN BRADLEY , VAN DEN HEUVEL ANTHONY
Abstract: A time division multiplexed system is disclosed in which communication messages among a wide area site and a plurality of substantially scattered local sites are communicated on a radio frequency channel which is divided into a plurality of time slots, wherein at least one of the time slots is further divided into a plurality of subslots. Communication units operating in the wide area site communicate communication messages during the time slots, and the communication units operating in the local sites communicate communication messages during the subslots which are assigned to each of the local sites.
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2.发明专利
公开(公告)号：AU7358494A
公开(公告)日：1995-03-22
申请号：AU7358494
申请日：1994-07-11
Applicant: MOTOROLA INC
Inventor： CUDAK MARK C , NEWBERG DONALD G , HIBEN BRADLEY , LOGALBO ROBERT D
Abstract: In a digital communication system, communication units may reduce power consumption while attempting to detect reception of valid data by sampling and filtering a data stream at a first sampling rate producing a first filtered data stream. When the first filtered data stream indicates potential valid data, the communication unit samples and filters the data stream at a second sampling rate, wherein the second sampling rate is greater than the first sampling rate and consumes more power, producing a second filtered data stream. The communication unit determines whether the data stream contains valid data based on the second filtered data stream.
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Patent Agency Ranking
公开(公告)号：DE69131715D1
公开(公告)日：1999-11-18
申请号：DE69131715
申请日：1991-11-07
Applicant: MOTOROLA INC
Inventor： CRISLER KENNETH , HIBEN BRADLEY , VAN DEN HEUVEL ANTHONY
Abstract: A time division multiplexed system is disclosed in which communication messages among a wide area site and a plurality of substantially scattered local sites are communicated on a radio frequency channel which is divided into a plurality of time slots, wherein at least one of the time slots is further divided into a plurality of subslots. Communication units operating in the wide area site communicate communication messages during the time slots, and the communication units operating in the local sites communicate communication messages during the subslots which are assigned to each of the local sites.
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公开(公告)号：DE69131503D1
公开(公告)日：1999-09-09
申请号：DE69131503
申请日：1991-12-16
Applicant: MOTOROLA INC
Inventor： WILSON ALAN , CUDAK MARK , HIBEN BRADLEY , ZIOLKO ERIC , JASPER STEVEN
Abstract: A transceiver compatible with both wide channel constant envelope 4 level FSK FM modulation and narrow channel pi /4 differential QPSK linear modulation allows compatible interaction between modified constant envelope and non-constant envelope transmitters. All Nyquist filtering occurs in the transmitters, and none in the receiver.
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公开(公告)号：DE69131503T2
公开(公告)日：2000-03-23
申请号：DE69131503
申请日：1991-12-16
Applicant: MOTOROLA INC
Inventor： WILSON ALAN , CUDAK MARK , HIBEN BRADLEY , ZIOLKO ERIC , JASPER STEVEN
Abstract: A transceiver compatible with both wide channel constant envelope 4 level FSK FM modulation and narrow channel pi /4 differential QPSK linear modulation allows compatible interaction between modified constant envelope and non-constant envelope transmitters. All Nyquist filtering occurs in the transmitters, and none in the receiver.
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公开(公告)号：DE69228376T2
公开(公告)日：1999-09-23
申请号：DE69228376
申请日：1992-10-19
Applicant: MOTOROLA INC
Inventor： LO GALBO ROBERT , HIBEN BRADLEY , CUDAK MARK
Abstract: A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.
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公开(公告)号：DE69228376D1
公开(公告)日：1999-03-18
申请号：DE69228376
申请日：1992-10-19
Applicant: MOTOROLA INC
Inventor： LO GALBO ROBERT , HIBEN BRADLEY , CUDAK MARK
Abstract: A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.
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