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Communications system handoff operation combining turbo coding and soft handoff techniques

  • US 5,978,365 A
  • Filed: 07/07/1998
  • Issued: 11/02/1999
  • Est. Priority Date: 07/07/1998
  • Status: Expired due to Term
First Claim
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1. A mobile communication system, comprising:

  • a source of digital data, for communication to or from a predetermined one of a plurality of mobile stations;

    a first constituent encoder, coupled to the source, for encoding the digital data into a first code sequence;

    an intierleaver, coupled to the source, for interleaving the digital data;

    a second constituent encoder, coupled to the interleaver, for encoding the interleaved digital data into a second code sequence;

    a first code puncturer, coupled to the first and second constituent encoders, for selectively replacing data in the first code sequence with selected data from the second code sequence to form a first punctured code sequence;

    a second code puncturer, coupled to the first and second constituent encoders, for selectively replacing data in the second code sequence with selected data from the first code sequence to form a second punctured code sequence;

    first and second transmitters for transmission of information on first and second logical channels assigned to the predetermined mobile station; and

    a control coupled to the first and second transmitters, wherein during a handoff operation, the control causes the first transmitter to broadcast the first channel carrying the digital data together with the first punctured code sequence, and concurrently causes the second transmitter to broadcast the second channel carrying the interleaved digital data together with the second punctured code sequence.

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