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System and method for orthogonal spread spectrum sequence generation in variable data rate systems

  • US 5,751,761 A
  • Filed: 09/21/1994
  • Issued: 05/12/1998
  • Est. Priority Date: 07/20/1993
  • Status: Expired due to Term
First Claim
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1. A modulation system for use in a spread spectrum communications system, said modulation system being disposed to transmit an information signal, comprising:

  • means for selecting a first function from a set of functions in accordance with a selected characteristic of said information signal, said set of functions including a plurality of subsets of functions, wherein a predefined recursive relationship exists among the functions within each of said subsets, said means for selecting including means for preventing selection of more than a single function from each of said subsets, and members of said subsets are orthogonal to members of all other subsets;

    means for generating a function signal representative of said first function;

    means for generating a pseudorandom noise (PN) signal of a predetermined PN code; and

    means for combining said function signal, said PN signal and said information signal, and for providing a resultant first modulation signal.

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