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Performance of iterative decoding with imperfect MMSE DFE

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4 Author(s)
Grace Oletu ; Department of Computer and Communication Systems, School of Engineering, the University of Greenwich, UK ; Titus Eneh ; Predrag Rapajic ; Kwashie Anang

The MMSE-DFE is a well established Intersymbol Interference (ISI) mitigating structure on linear, noisy, and dispersive channels. Time invariant communication channels exhibits ISI for severe frequency-selective channels. In this paper we investigate the iterative decoding with imperfect MMSE decision feedback equalizer using different modulation scheme. We assume that soft outputs from channel decoder are independent identically distributed Gaussian random variables with known mean and variance. The Imperfect MMSE DFE using different modulation outperforms other turbo equalization algorithms of similar computational complexity in terms of bit-error rate. The achieved improvement is up to 3dB for severe frequency-selective channels.

Published in:

Wireless Days (WD), 2011 IFIP

Date of Conference:

10-12 Oct. 2011