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Multiple access coding using bent sequences for mobile radio communications

  • US 5,550,809 A
  • Filed: 08/16/1994
  • Issued: 08/27/1996
  • Est. Priority Date: 04/10/1992
  • Status: Expired due to Term
First Claim
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1. In a system for communicating a sequence of information symbols, a transmitter comprising:

  • means for spreading each information symbol with a respective spreading sequence, thereby forming a sequence of spread symbols, wherein the spreading sequences are selected from a set of spreading sequences that are mutually orthogonal or bi-orthogonal;

    means for scrambling each spread symbol with a common scramble mask, thereby producing a sequence of scrambled symbols, wherein the common scramble mask is selected from a set of scramble masks having optimal or semi-optimal correlation properties; and

    means for transmitting the sequence of scrambled symbols over a communication channel.

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