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Interference mitigation by joint decoding of overlapped signals

  • US 5,937,015 A
  • Filed: 09/19/1996
  • Issued: 08/10/1999
  • Est. Priority Date: 01/11/1994
  • Status: Expired due to Term
First Claim
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1. A joint soft-decision decoder for decoding overlapping received signals, comprising:

  • receiver means for receiving the overlapping received signals and outputting signal samples representative of a weighted sum of the overlapping received signals and a delayed signal echo of at least one of the overlapping received signals;

    a deinterleaver for generating deinterleaved samples from the signal samples, wherein successive sets of deinterleaved samples depend only on successive information bits and one or more previous information bits;

    joint sequential maximum likelihood processing means for processing the deinterleaved samples and forming hypotheses of information bit sequences encoded in each of the overlapping received signals and computing cumulative path metrics for each combination of a hypothesis of one information bit sequence with a hypothesis of each of the other information bit sequences, wherein the path metrics are indicative of the likelihood that the associated combination of hypothesized information bit sequences comprises the correct hypotheses; and

    selection means for selecting the combination of hypothesized information bit sequences having an associated cumulative path metric indicative of highest likelihood, thereby decoding the overlapping received signals,wherein said overlapping received signals are interleaved prior to transmission such that each signal, observed at a given time, is dependent only on a current information bit and one or more previous information bits.

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