Low complexity adaptive equalizer radio receiver employing reduced complexity branch metric calculation
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United States of America Patent
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Jan 30, 1996
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app pub date -
Oct 29, 1993
filing date -
Oct 29, 1993
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Abstract
A low complexity adaptive equalizer for use in U.S. digital cellular radios demodulates .pi./4-shifted differentially encoded quadrature phase shift keyed (DQPSK) encoding in the presence of intersymbol interference (ISI) with reduced decoding complexity by employing an estimated received constellation which takes into account channel changes over time and ISI. The complexity is reduced by tracking a reduced number of estimated reference symbol constellation points and taking advantage of the geometry to estimate the remaining symbol constellation points. Branch metrics are also determined with a reduced number of computations.
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