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Indirect adaptive equalization algorithm in shallow water acoustic communication

2013-09-22
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In order to eliminate the inter-symbol interference caused by the shallow sea acoustic channel with time-varying and multipath characteristics, this paper proposes an indirect adaptive equalization algorithm. At the transmitting end, a frame structure suitable for transmission in the shallow sea acoustic channel is designed. At the receiving end, the frame header is used for fast channel estimation and initialization of the equalizer tap coefficients. The taps at specific positions are selectively activated by setting the threshold. The variable step-size LMS algorithm is used to further reduce the error and better equalize the frame data. Theoretical analysis and simulation results show that the algorithm has fast convergence and low hardware complexity, has a good equalization effect on the transmitted signal after high-order modulation, and can be effectively applied to shallow sea high-speed digital communication systems.

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