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| Decision Feedback Blind Equalization Algorithm Based on RENYI Entropy for Underwater Acoustic Channels |
| Zhang Yin-bing; Zhao Jun-wei; Li Jin-ming; Sun Yong |
| College of Marine Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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Abstract In order to depress the severe Inter-Symbol Interference (ISI) caused by multi-path fading, channels must be equalized in underwater communication systems. To enhance the convergence ability of the traditional Constant Modulus Algorithm with Decision Feedback Equalization (CMA-DFE), a decision feedback blind equalization algorithm based on RENYI entropy is proposed in this paper. The proposed algorithm adjusts the forward equalizer coefficients with RENYI entropy algorithm and the backward equalizer coefficients with CMA algorithm. Compared with CMA-DFE, RENYI-DFE algorithm has accelerated the convergence speed of the blind equalizer with only little computational cost. The performance of the algorithm is validated by computer simulations.
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Received: 11 January 2008
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2009, Vol. 31 
