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Multi-bit correlation of continuous phase modulated signals

  • US 5,659,574 A
  • Filed: 06/07/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 09/09/1994
  • Status: Expired due to Term
First Claim
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1. A spread spectrum receiver comprising:

  • means for receiving an input signal,a first multiplier having inputs coupled to said input signal and a first reference signal,a second multiplier having inputs coupled to said input signal and a phase-offset version of said first reference signal,a first filter connected to an output of said first multiplier,a second filter connected to an output of said second multiplier,a first multi-bit analog-to-digital converter connected to an output of said first filter,a second multi-bit analog-to-digital converter connected to an output of said second filter,a multi-bit serial correlator connected to an output from said first multi-bit analog-to-digital converter and an output from said second multi-bit analog-to-digital converter, said multi-bit serial correlator outputting a unified correlation signal in response thereto, wherein said multi-bit serial correlator comprises;

    a third multiplier having inputs connected to an output of said first multi-bit analog-to-digital converter and to a chip signal,a fourth multiplier having inputs connected to an output of said second multi-bit analog-to-digital converter and to said chip signal,a first multiplexer connected to an output of said third multiplier and to an output of said fourth multiplier,a second multiplexer connected to the output of said third multiplier and to an inverse of the output of said fourth multiplier,a first accumulator connected to an output of said first multiplexer,a second accumulator connected to an output of said second multiplexer, anda magnitude calculation block connected to an output of said first accumulator and an output of said second accumulator.

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