Title:
DIGITAL MULTIPLEX RADIO RECEIVER
Document Type and Number:
Japanese Patent JPH07307717
Kind Code:
A
Abstract:
PURPOSE: To provide a digital multiplex radio receiver capable of quickly and stably recovering to a synchronizing state when a reception carrier becomes an asynchronous state.
CONSTITUTION: When a multi-valued orthogonal amplitude signal IF is asynchronous state with a carrier frequency signal S 1 for demodulation, the adaptive equalization data YI and YQ in the specified area on the phase planes of Ich and Qch orthogonal coordinates are recognized. Based on the data YI and YQ in the specified area, the operation amplifying Ich and Qch demodulation signals to a prescribed level is controlled. When the data YI and YQ do not exist in the specified area in the asynchronous state, control signals S 4I and S 4Q just before are outputted.
Inventors:
ONIYANAGI HIROYUKI
KOBAYASHI KENZO
TAMURA TOSHIO
OGATA KATSUTOSHI
NARITA TOSHIO
TERAKADO TAKUHIKO
KOBAYASHI KENZO
TAMURA TOSHIO
OGATA KATSUTOSHI
NARITA TOSHIO
TERAKADO TAKUHIKO
Application Number:
JP32201794A
Publication Date:
November 21, 1995
Filing Date:
December 26, 1994
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03H21/00; H04B3/04; H04J11/00; H03H15/00; H04L27/38; (IPC1-7): H04J11/00; H03H15/00; H03H21/00
Attorney, Agent or Firm:
Hayashi Tsunori
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