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    APPARATUS AND METHOD FOR TRANSMITTING SIGNALS IN A COMMUNICATION SYSTEM
    1.
    发明专利
    APPARATUS AND METHOD FOR TRANSMITTING SIGNALS IN A COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2302491A1

    公开(公告)日：1999-03-11

    申请号：CA2302491

    申请日：1998-07-17

    Applicant: MOTOROLA INC

    Inventor： ROHANI KAMYAR ,  ROZANSKI WALTER J JR ,  KOTZIN MICHAEL D

    IPC: H04L27/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L1/02 ,  H04B1/69 ,  H04B7/02

    Abstract: Orthogonal transmit diversity is implemented by employing a data splitter(803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

    Radio Frequency Error Detection and Correction System
    3.
    发明专利
    Radio Frequency Error Detection and Correction System 未知

    公开(公告)号：CA2107767A1

    公开(公告)日：1992-11-29

    申请号：CA2107767

    申请日：1992-01-30

    Applicant: MOTOROLA INC

    Inventor： WIECZOREK ALFRED B ,  LYNK CHARLES N JR ,  ROZANSKI WALTER J JR ,  ZDUNEK KENNETH J ,  MANSFIELD TERRY K

    IPC: H04B17/00 ,  H04B1/40 ,  H04B7/005

    Abstract: A radio communication system including a control station and at least one remote station (20) is provided. The control station has a receiver for receiving radio signals, a transmitter for transmitting radio signals and a demodulator for measuring the frequency of the received signals. Responsive to a request for frequency measurement received from the receiver, the control station also has an error signal encoder to provide an error feedback signal containing the polarity and magnitude of the frequency difference for transmission by the transmitter. At least one remote station (20) has a receiver (25), a transmitter (26), a frequency controller (46), an encoder for encoding the request for frequency measurement and for actuating the transmitter (26) to transmit the request, and a decoder (34), responsive to the received error feedback signal for adjusting the frequency control.

    4.
    发明专利
    未知

    公开(公告)号：BR9811628A

    公开(公告)日：2002-01-22

    申请号：BR9811628

    申请日：1998-07-17

    Applicant: MOTOROLA INC

    Inventor： KOTZIN MICHAEL D ,  ROZANSKI WALTER J JR ,  ROHANI KAMYAR

    IPC: H04L27/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L1/02 ,  H04B1/707 ,  H04B7/02

    Abstract: Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

    METHOD AND APPARATUS FOR TRANSMITTING SIGNALS IN A COMMUNICATION SYSTEM
    6.
    发明专利
    METHOD AND APPARATUS FOR TRANSMITTING SIGNALS IN A COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2298647C

    公开(公告)日：2003-01-21

    申请号：CA2298647

    申请日：1998-07-14

    Applicant: MOTOROLA INC

    Inventor： ROZANSKI WALTER J JR ,  KOTZIN MICHAEL D

    IPC: H04L27/30 ,  H04B7/06 ,  H04B7/10 ,  H04B7/26 ,  H04B15/00 ,  H04J11/00 ,  H04Q7/36 ,  H04K1/00

    Abstract: Different orthogonal codes (W x, W y) are used to spread common pilot channe ls (Pilot A) intended for transmission to a particular mobile station (106) within a coverage area (sector A) to implement forward link transmit diversity. By implementing separate, different orthogonal codes (W x, W y) for each pilot channel (Pilot A), the pilot signals transmitted via antennas (218, 222) to a common coverage area (sector A) are orthogonal to one another and thus do not degrade system performance. Additionally, the use of different orthogonal codes (W x, W y) for each pilot channel (Pilot A) allows the mobile station (106) to discern which pilot channel spread with a different orthogonal code includes corresponding traffic channel (TCH) information. This allows forward link transmit diversity to be enabled/disabled based on conditions associated with the environment, the communications channel, etc. without a complete loss of information as seen by the mobile station (106).

    8.
    发明专利
    未知

    公开(公告)号：FR2757004A1

    公开(公告)日：1998-06-12

    申请号：FR9714495

    申请日：1997-11-19

    Applicant: MOTOROLA INC

    Inventor： SCHORMAN ERIC R ,  ROZANSKI WALTER J JR ,  CLARK MICHAEL PAUL

    IPC: H04B15/00 ,  H01Q3/26 ,  H04B7/06 ,  H04B7/10 ,  H04B7/26 ,  H04W16/28 ,  H04Q7/36

    Abstract: In a wireless communications system (20), a beacon having a first radiation pattern (28) covering a portion of a subscriber service area (34) covered by a base station is transmitted. A subscriber (36) reception quality is then measured to produce a first beacon quality measurement (210). Thereafter, the first radiation pattern is changed to a second radiation pattern (32, 212), and a subscriber reception quality of the beacon transmitted with a second radiation pattern is measured to produce a second beacon quality measurement (214). In response to the first and second beacon quality measurements, a traffic channel radiation pattern (32) is selected (218), wherein such radiation pattern covers a portion of the subscriber service area. In a preferred embodiment, the beacon carrier frequency is the same as the traffic channel carrier frequency.

    QUASI-DUPLEX RADIO SYSTEM USING BI-DIRECTIONAL HOLE EXTENSION
    9.
    发明专利
    QUASI-DUPLEX RADIO SYSTEM USING BI-DIRECTIONAL HOLE EXTENSION 未知

    公开(公告)号：CA2063388A1

    公开(公告)日：1991-06-19

    申请号：CA2063388

    申请日：1990-12-12

    Applicant: MOTOROLA INC

    Inventor： REED JOHN D ,  ROZANSKI WALTER J JR ,  LYNK CHARLES N JR

    IPC: H04W4/10 ,  H04W84/08 ,  H04J3/16 ,  H04B7/26

    Abstract: 2063388 9109481 PCTABS00005 A method for interrupting a radio transmission in a quasi-duplex radio-frequency communication system. The method of the present invention includes the step of transmitting a signal (22), with periodically-occurring holes (24) therein, by a first communication unit (10) to at least a second communication unit (12). The transmitted signal (12) includes an audio information portion (16) and information packets (23). Each information packet (23) specifies the time of occurrence of the next hole (24). The second communication unit (12) initiates an interruption of the transmission made by the first communication unit (10) by transmitting an interrupt request signal (31) to the first communication unit (10) at a time specified by an information packet (23) received by the second communication unit (12). When the first communication unit (10) receives the interrupt request signal (31), it processes the interrupt request signal (23) to determine whether it complies with predetermined criteria. If the first communication unit determines that the interrupt request signal complies with the predetermined criteria, it transmits an acknowledgement signal allowing the second communication unit (12) to interrupt the transmission so that the second communication unit (12) may begin transmitting information to be received by at least the first communication unit (10).

    SIMULCAST TRANSMISSION SYSTEM HAVING PHASE-LOCKED REMOTE TRANSMITTERS
    10.
    发明专利
    SIMULCAST TRANSMISSION SYSTEM HAVING PHASE-LOCKED REMOTE TRANSMITTERS 未知

    公开(公告)号：CA1113545A

    公开(公告)日：1981-12-01

    申请号：CA323758

    申请日：1979-03-19

    Applicant: MOTOROLA INC

    Inventor： CANNALTE GARY A ,  CHAPMAN RONALD H ,  ROZANSKI WALTER J JR

    IPC: H04B1/04 ,  H04H20/67 ,  H04J3/06 ,  H04L7/033 ,  H04B7/26

    Abstract: SIMULCAST TRANSMISSION SYSTEM HAVING PHASE-LOCKED REMOTE TRANSMITTERS A simulcast transmission system is provided where a reference signal transmitted from a central station is utilized to phase-lock transmitters located at remote stations. The remote stations include a receiver for receiving the transmitted reference signal and a signal conditioner for conditioning the received reference signal for application to the transmitters. The transmitters include a phase-locked loop which may be followed by a multiplier for providing transmitter signals of predetermined frequencies. All the transmitters at the remote stations are phase locked to the reference signal transmitted from the central station. In the event that the reference signal transmitted by the central station is interrupted, the signal conditioner of the remote stations will operate in an open-loop fashion to provide the conditioned reference signal during the interruption. After the interruption has cleared, the signal conditioner is automatically phase synchronized to the reference signal and closed-loop operation is resumed.

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