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Variable rate CDMA spread circuit

  • US 6,130,884 A
  • Filed: 12/04/1997
  • Issued: 10/10/2000
  • Est. Priority Date: 12/05/1996
  • Status: Expired due to Term
First Claim
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1. A variable rate CDMA spread circuit in a mobile communication system using direct spread code division multiplex access and having channels which transmit data at a plurality of bit rates, saia first spread code generator which generates a first spread code at a basic rate, said first spread code being used by all channels in said spread circuit;

  • second spread code generator which generates second spread codes, each second spread code being unique for each channel in said spread circuit;

    wherein subrate channels which transmit data at a subrate corresponding to 1/M of said basic rate, are discriminated from one another by spreading data of said subrate channels in accordance with a respective second spread code which has a code length M; and

    all of said second spread codes are orthogonal to each other.

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