%0 Journal Article %A Liang Zhao and Jianhua Ge %D 2011 %J International Journal of Information and Communication Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 49, 2011 %T A Novel Receiver Algorithm for Coherent Underwater Acoustic Communications %U https://publications.waset.org/pdf/11402 %V 49 %X In this paper, we proposed a novel receiver algorithm for coherent underwater acoustic communications. The proposed receiver is composed of three parts: (1) Doppler tracking and correction, (2) Time reversal channel estimation and combining, and (3) Joint iterative equalization and decoding (JIED). To reduce computational complexity and optimize the equalization algorithm, Time reversal (TR) channel estimation and combining is adopted to simplify multi-channel adaptive decision feedback equalizer (ADFE) into single channel ADFE without reducing the system performance. Simultaneously, the turbo theory is adopted to form joint iterative ADFE and convolutional decoder (JIED). In JIED scheme, the ADFE and decoder exchange soft information in an iterative manner, which can enhance the equalizer performance using decoding gain. The simulation results show that the proposed algorithm can reduce computational complexity and improve the performance of equalizer. Therefore, the performance of coherent underwater acoustic communications can be improved greatly. %P 111 - 115