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    METHOD AND DEVICE FOR DEMODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEM AND POWER CONTROL BIT DETECTION
    1.
    发明专利
    METHOD AND DEVICE FOR DEMODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEM AND POWER CONTROL BIT DETECTION 失效

    公开(公告)号：JPH1032560A

    公开(公告)日：1998-02-03

    申请号：JP9014997

    申请日：1997-03-25

    Applicant: MOTOROLA INC

    Inventor： LING FUYUN ,  BORTH DAVID E ,  FRANK COLIN D ,  RASKY PHILLIP D ,  KEPLER JAMES F

    IPC: H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L25/02

    Abstract: PROBLEM TO BE SOLVED: To attain improved demodulation for a spread spectrum communication signal including quick and accurate detection of a power control bit in a spread spectrum system. SOLUTION: A receiver circuit 400 receives a spread spectrum communication signal such as a DS-CDMA signal and conducts inverse spread processing and decoding. A channel phase and a channel gain for a communication channel are estimated from a pilot symbol of a pilot channel. The estimated value is provide to a demodulator 422 to demodulate a symbol of a traffic channel. Furthermore, a channel phase and a channel gain for a power control identifier are estimated from a pilot symbol. The estimated value is provided to a demodulator 424 to demodulate the power control identifier. The traffic channel symbol is delayed by a prescribed time in a delay element 420 before the demodulation. The power control identifier is delayed at a short delay element 418 or not delayed at all before demodulation.

    TIME DIVISION MULTIPLE ACCESS(TDMA) COMMUNICATION SYSTEM PROVIDED WITH ADAPTIVE EQUALIZER CONTROL FUNCTION
    2.
    发明专利
    TIME DIVISION MULTIPLE ACCESS(TDMA) COMMUNICATION SYSTEM PROVIDED WITH ADAPTIVE EQUALIZER CONTROL FUNCTION 失效

    公开(公告)号：JPH1028084A

    公开(公告)日：1998-01-27

    申请号：JP6375397

    申请日：1997-03-03

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID E

    IPC: H04J3/00 ,  H04B3/10 ,  H04B7/005 ,  H04B7/26 ,  H04L7/02 ,  H04L7/04 ,  H04Q7/38

    Abstract: PROBLEM TO BE SOLVED: To reduce multi-path interference distortion by time-multiplexing a user message with a different message, inserting different delay to a reception data path again and compensating inter-symbol interference. SOLUTION: A TDMA controller 140 time-multiplexes the respective user messages with the other user message and generates TDMA signals. The TDMA signals 145 are impressed to a transmitter 150 and the TDMA signals 145 are received in an antenna 210 and supplied to a receiver 220. Then, they are impressed to a data butter 230 and the TDMA controller 240. Then, in order to compensate distortion in reception signals by inter-code interference and/or Rayleigh phasing, an equalizer 250 uses information obtained from an equalizer synchronization word, performs the continuous detailed measurement of multi- path characteristics and equalizes (uniformizes) the reception signals corresponding to the characteristics.

    A DUAL MODE RADIO COMMUNICATION UNIT.
    5.
    发明公开
    A DUAL MODE RADIO COMMUNICATION UNIT. 失效
    两种模式RADIO新闻单位。

    公开(公告)号：EP0669025A4

    公开(公告)日：1997-05-07

    申请号：EP93923291

    申请日：1993-10-07

    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

    CPC classification number: H04L1/0043 ,  H04L1/06 ,  H04W88/06

    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.

    7.
    发明专利
    未知

    公开(公告)号：FI952262A0

    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.

    DIGITAL AUTOMATIC GAIN CONTROL
    9.
    发明专利
    DIGITAL AUTOMATIC GAIN CONTROL 未知

    公开(公告)号：CA2000785C

    公开(公告)日：1994-10-25

    申请号：CA2000785

    申请日：1989-10-16

    Applicant: MOTOROLA INC

    Inventor： KEPLER JAMES F M ,  BORTH DAVID E ,  CERNY FRANK J JR

    IPC: H03G3/20 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04J3/00 ,  H04J3/16 ,  H04L27/18 ,  H04L27/22 ,  H04L27/38 ,  H04J3/02 ,  H04B1/40

    Abstract: There is provided a method of digital Automatic Gain Control (AGC) in areceiver having limited dynamic range, particularly for discontinuous signals. The method comprises 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 AGC. The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing 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 sensitivity to establish a desired relationship between the AGC'd signal and the dynamic range limitation.

    10.
    发明专利
    未知

    公开(公告)号：MX9307019A

    公开(公告)日：1994-06-30

    申请号：MX9307019

    申请日：1993-11-10

    Applicant: MOTOROLA INC

    Inventor： CHIASSON GREGORY M ,  BORTH DAVID E ,  HAUG JOHN R ,  RASKI PHILLIP D

    IPC: H03M13/33 ,  H04B1/40 ,  H04L1/00 ,  H04L7/04 ,  H04B7/00

    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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