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Digital synthesized wideband noise-like waveform

  • US 5,848,160 A
  • Filed: 02/20/1996
  • Issued: 12/08/1998
  • Est. Priority Date: 02/20/1996
  • Status: Expired due to Term
First Claim
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1. Apparatus for generating a digitally synthesized noise-like waveform that may be used to modulate and demodulate communication data, said apparatus comprising:

  • a seed generator for generating a predetermined random seed input;

    a read only memory look-up table comprising pseudo-random digital samples having predetermined statistics;

    a sequence generator coupled between the seed generator and the read only memory look-up table for generating a pair of pseudo-random sequences in response to the predetermined seed input that address the read only memory look-up table and output a pair of pseudo-random samples;

    processing means coupled to the read only memory look-up table for combining the pair of pseudo-random samples with communication data to generate a spread spectrum waveform; and

    modulation means coupled to the processing means for processing the spread spectrum waveform to generate a modulated output signal having a digitally synthesized noise-like waveform.

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