Decision Feedback Iterative Equalization Receiver for Underwater Acoustic Communication Based on Symbol-By-Symbol Posterior Information Soft Decision

Underwater acoustic communication is an important wireless communication method for underwater information communication. However, the time-varying, frequency-varying, and space-varying characteristics of underwater acoustic channels pose great challenges to receiver design for underwater acoustic communications. The adaptive decision feedback iterative equalizer is an effective design method for underwater acoustic communication receivers. It adopts an adaptive method for symbol judgment, and uses the information interaction between the equalizer and the decoder to further improve the equalization reliability. A balanced design among balance accuracy, steady-state error, computational complexity, and system overhead can be achieved. This paper proposes a design method of underwater acoustic communication decision feedback iterative equalization receiver based on symbol-by-symbol posterior information soft decision. The receiver design method uses adaptive algorithm to calculate soft-decision symbols in a symbol-by-symbol manner, which can accurately obtain the equalization process Equalize the variation of symbol mean value and variance, thereby improving the accuracy of decoding and the reliability of the receiver. In this paper, the proposed receiver design method is verified by the measured data.