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Digital matched filter

  • US 5,903,595 A
  • Filed: 02/27/1997
  • Issued: 05/11/1999
  • Est. Priority Date: 12/10/1996
  • Status: Expired due to Term
First Claim
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1. A digital matched filter for executing correlation processing of an input received spread spectrum signal with a spread code, comprising:

  • an input signal generating means for generating an input data array, said input signal generating means includingmeans for sampling a received spread spectrum signal according to a timing signal, said spread spectrum signal having been generated by applying a spread code array of specified spread code length n (wherein n is an integer greater than

         1) to an information signal having a plurality of information bits, and quantizing each sample of said received spread spectrum signal using a quantization interval of m bits (wherein m is an integer greater than

         1), anda storage circuit having n storage locations, each storage location storing an m-bit quantized sample of said received spread spectrum signal, wherein said storage circuit outputs n m-bit samples of said received spread spectrum signal according to said timing signal as said input data array;

    a reference signal generating means for outputting a reference data array of length n corresponding to said spread code array, said reference signal generating means including a shift register for incrementally shifting said reference data array according to said timing signal;

    a multiplying circuit for multiplying said input data array by said reference data array and outputting multiplied data results; and

    an adding circuit for adding together said multiplied data results and outputting the result as a correlation value.

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