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Estimation of the Feedback Reliability for IB-DFE Receivers

Amaral, F. ; Dinis, R. ; Carvalho, P.

ISRN Communications and Networking Journal Vol. 2011, Nº -, pp. - - -, June, 2011.

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Abstract
SC modulation (Single-Carrier) with FDE (Frequency-
Domain Equalization) combined with iterative (turbo) FDE
schemes has been shown to be suitable for cyclic-prefix
(CP)-assisted block transmission within broadband wireless
systems. Its excellent performance in severely timedispersive
channels, makes it a promising candidate for future
broadband wireless systems.
In this paper we investigated the impact of the correlation
factor estimation in the performance of IB-DFE (Iterative
Block Decision Feedback Equalization) receivers.
Since the correlation factor represents a key parameter to
ensure the good performance of these receivers, reliable
estimates of this factor are needed in the feedback loop.
We present several methods to estimate the correlation coefficient.
We also propose a technique to compensate the
inaccuracy of the estimation.