Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1993-10-29
1996-01-30
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375233, 375348, 36472419, 371 43, H03D 100, H04L 2706
Patent
active
054886350
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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Chennakeshu Sandeep
Koilpillai Ravinder D.
Toy Raymond L.
Chin Stephen
General Electric Company
Snyder Marvin
Webster Bryan E.
Zale Lawrence P.
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