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Equalizers

  • US 5,091,918 A
  • Filed: 09/18/1990
  • Issued: 02/25/1992
  • Est. Priority Date: 03/05/1988
  • Status: Expired due to Fees
First Claim
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1. An equalizer for a radio signal receiver, said equalizer comprising:

  • a converter for producing, from a received radio signal, digital samples at baseband, the received radio signal being in packet form and including a header having a predetermined bit sequence;

    means for providing an estimate of channel distorting by comparing the received predetermined bit sequence with a stored version of the predetermined bit sequence in the receiver;

    a signal set store in which signal sets are stored;

    means for applying the estimate of channel distortion to the stored signal sets to modulate the stored signal sets in accordance with the estimate;

    means for selecting modulated ones of the stored signal sets;

    metric generating means receiving said selected modulated stored signal sets and digital samples of said received radio signal for generating metrics of the selected stored modulated signal sets and the digital samples; and

    a processor for processing the generated metrics in accordance with a Viterbi algorithm to determined the most probably value of each digital sample of the received radio signal.

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