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Sub-symbol matched filter-based frequency error processing for spread spectrum communication systems

  • US 6,366,626 B1
  • Filed: 09/23/1998
  • Issued: 04/02/2002
  • Est. Priority Date: 09/26/1997
  • Status: Expired due to Term
First Claim
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1. A matched filter of temporal length Ts for processing a broadband signal of frequency uncertainty δ

  • f comprising;

    a plurality of N cascaded sub-symbol matched filter segments, each of which has a duration Ts/N sufficient to prevent loss of signal energy over said frequency uncertainty δ

    f that would prevent recovery of said broadband signal;

    a plurality of K phase rotation-signal combiner stages, outputs of which are associated with K frequency bins of said matched filter, a respective phase rotation-signal combiner stage being operative to produce a summation of products of outputs of said sub-symbol filter segments and a respective set of mutually offset phase rotation vectors.

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