Least-symbol-error-rate adaptive decision feedback equalization for underwater channel

Authors:
Beixiong Zheng;Fangjiong Chen;Fei Ji;Hua Yu
Affiliations:
South China University of Technology, Guangzhou, China;South China University of Technology, Guangzhou, China;South China University of Technology, Guangzhou, China;South China University of Technology, Guangzhou, China
Venue:
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
Year:
2013

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Abstract

The decision feedback equalizer (DFE) has been applied in underwater channel equalization and has been shown to have promising performance. Existing DFEs for underwater communication are mainly based on the minimum-mean-square-error (MMSE) criterion. In this paper we derive a new DFE based on the minimum-symbol-error rate (MSER) criterion. The problem is formulated as minimizing the norm between two subsequent adaptations. The MSER criterion is converted to the constraint of correct symbol detection. The resulting DFE has a simple structure, similar to the conventional LMS filter. Moreover, simulations show it significantly outperforms the MMSE based DFEs.