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Method and apparatus for despreading a spread spectrum signal at baseband

  • US 4,484,335 A
  • Filed: 10/14/1982
  • Issued: 11/20/1984
  • Est. Priority Date: 10/14/1982
  • Status: Expired due to Fees
First Claim
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1. A baseband correlator circuit for despreading a spread spectrum signal, comprising;

  • means for translating said spread spectrum signal to baseband to produce an I (in-phase) channel baseband signal and a Q (quadrature) channel baseband signal, said spread spectrum signal utilizing a pseudonoise (PN) code sequence,means for converting a two-phase local PN signal comprising said PN code sequence into four-phase signals comprising two in-phase PN signals and two quadrature phase PN signals,means comprising four double balanced multipliers for multiplying said I and Q channel baseband signals by each of said four PN signals to produce first, second, third and fourth product signals,means for summing said first and second product signals to produce a despread I channel output signal, andmeans for summing said third and fourth product signals to produce a despread Q channel output signal.

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