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Code division multiple access mobile communication system

  • US 6,721,296 B2
  • Filed: 08/14/2002
  • Issued: 04/13/2004
  • Est. Priority Date: 09/11/1995
  • Status: Expired due to Fees
First Claim
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1. A mobile station for use with a mobile communication system multiplexing a plurality of communication channels using spread spectrum codes, comprising:

  • an oscillator;

    a radio frequency demodulator demodulating a radio frequency band signal transmitted from a base station by use of a signal from said oscillator;

    a spreading circuit spreading a data signal to be transmitted; and

    a radio frequency modulator modulating said spread data signal by use of a signal from said oscillator, wherein an oscillation frequency of the oscillator is controlled by use of a change of phase shift detected using a signal representing a phase shift detected from the demodulated radio frequency band signal transmitted from the base station.

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