There is the transmission system of high frequency stability

There is the transmission system of high frequency stability

  • CN 1,469,559 B
  • Filed: 06/16/2003
  • Issued: 11/25/2015
  • Est. Priority Date: 06/18/2002
  • Status: Active Grant
First Claim
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1. one kind is placed on the external unit (1) of the user side of transmission system, wherein said transmission system operates in downlink band, utilize at least one reference subcarrier being arranged in the multiple position of described downlink band, at least one reference subcarrier described is pilot signal, described downlink band also comprises at least one data downlink channel, and described external unit comprises:

  • Local oscillator (104), for generation of first frequency switching signal;

    First conversion equipment (103), for utilizing described first frequency switching signal that described downlink band is converted to the frequency band after the first conversion, the frequency band after described first conversion comprises the pilot signal after the first conversion;

    Frequency synthesizer (108), for generation of second frequency switching signal, the frequency of described second frequency switching signal is adjustable;

    Second conversion equipment (113), the pilot signal after changing first for utilizing second frequency switching signal is converted to the pilot signal after the second conversion;

    Band pass filter (114), for selecting the pilot signal after the second conversion;

    Reference oscillator (112), for generation of the reference signal with preset frequency;

    AndComparator (115), for the pilot signal after changing selected second with reference signal compared with, and produce signal, with the pilot signal after regulating local oscillator (104) to make selected second to change, there is the frequency corresponding with the frequency of reference signal.

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