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Summary: Fractionally Spaced Coherent Detection with DF MAP
Estimation of Statistically Known Time-Varying Rayleigh
Fading Channel
Huaping Liuy Zoran Siveskiy Nirwan Ansari
Department of Electrical and Computer Engineering
New Jersey Institute of Technology, Newark, NJ 07102 USA
Abstract
Coherent symbol by symbol detection using fractionally
spaced samples in a time-varying frequency
at Rayleigh
fading channel is presented. The proposed detector incor-
porates a decision feedback (DF) maximum a posteriori
(MAP) channel estimator that can be applied to a time-
varying
at Rayleigh fading channel with an arbitrary but
known spaced-time correlation function. The best achiev-
able bit error rate performance for this detector is obtained
by assumingcorrect bit decisions while performingchannel
estimation. Dierential encoding is used in order to pre-
vent the phase reversal phenomenon duringthe estimator's
operation in a decision directed mode. Numerical results
suggest that with only a few samples per symbol and with
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