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Use of orthogonal or near orthogonal codes in reverse link

  • US 6,917,581 B2
  • Filed: 07/15/2002
  • Issued: 07/12/2005
  • Est. Priority Date: 07/17/2001
  • Status: Active Grant
First Claim
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1. In a system that supports code division multiple access communications among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:

  • assigning to the first group of terminals a first pseudorandom noise code, each user of the first group being uniquely identifiable by a unique code phase offset;

    assigning to the second group of terminals the first pseudorandom noise codes, with each user of the second group also being assigned a common phase offset of that same pseudorandom noise code assigned to the first group; and

    assigning to each terminal of the second group a unique orthogonal spreading code, the unique orthogonal spreading code having a chipping rate less than the chipping rate of the first pseudorandom noise code.

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