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Equalisation apparatus and methods

  • US 7,333,540 B2
  • Filed: 10/09/2003
  • Issued: 02/19/2008
  • Est. Priority Date: 10/15/2002
  • Status: Expired due to Fees
First Claim
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1. A soft-in-soft-out (SISO) equaliser for use in a receiver of a communications system employing a plurality of transmit antennas, the equaliser comprising:

  • at least one received signal input for inputting a received signal;

    a plurality of likelihood value inputs, one for each transmit antenna, for inputting a plurality of decoded signal likelihood values from a SISO decoder;

    a processor configured to determine from said plurality of signal likelihood values an estimated mean and covariance value for a signal from each of said transmit antennas;

    an expected signal determiner coupled to said processor to determine an expected received signal value using said mean values;

    a subtractor coupled to said received signal input to subtract said expected received signal value from said received signal to provide a compensated signal;

    a filter coupled to said subtractor to filter said compensated signal to provide a plurality of estimated transmitted signal values, one for each said transmit antenna;

    a filter coefficient determiner coupled to said processor to determine coefficients of said filter using said covariance values; and

    an output stage coupled to said filter to output a plurality of transmitted signal likelihood values, one for each said transmit antenna, for input to said SISO decoder.

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