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Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties

  • US 6,526,091 B1
  • Filed: 08/17/1998
  • Issued: 02/25/2003
  • Est. Priority Date: 08/17/1998
  • Status: Expired due to Term
First Claim
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1. A method of determining a scrambling code group for a received signal in a digital communication system, in which signals are scrambled by respective scrambling codes, the scrambling codes are assigned to respective scrambling code groups, identities of the scrambling code groups are encoded in the signals by respective code-word-wise cyclically distinct sequences of signed code words, the method comprising the steps of:

  • correlating the received signal to each of a plurality of the code words, wherein the code words are S-Hadamard sequences;

    coherently combining the correlations in accordance with cyclic shifts of each of a plurality of sequences of signs; and

    determining a maximal coherently combined correlation to identify the scrambling code group for the received signal.

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