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Code division multiple access mobile communication system

  • US 6,456,609 B2
  • Filed: 08/07/2001
  • Issued: 09/24/2002
  • Est. Priority Date: 09/11/1995
  • Status: Expired due to Term
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 the oscillator; and

    a despreading circuit extracting a pilot signal by despreading the demodulated radio frequency band signal using the spread spectrum code assigned to the pilot signal;

    wherein an oscillation frequency of the oscillator is controlled by use of a change of a phase shift detected using a signal representing a phase shift detected from the extracted pilot signal.

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