Journal of Navigation and Port Research 2013;37(5):487-492.
Published online October 31, 2013.
수중 음향통신에 적합한 터보 등화기 기반의 최적의 반복 부호 기법 연구
박태두, 정지원
Analysis of Optimum Iterative Codes for Underwater Acoustic Communication based on Turbo Equalizer
Tae-Doo Park, Ji-Won Jung
Underwater acoustic communication has multipath error because of reflection by sea-level and sea-bottom. The multipath of underwater channel causes signal distortion and error floor. In order to improve the performance, it is necessary to employ an iterative coding scheme. Among the iterative coding scheme, turbo codes, LDPC codes and convolutional code based on BCJR algorithm are dominant channel coding schemes in recent. Therefore this paper analyzed the performance of iterative codes based on turbo equalizer with the same coding rate and similar codeword length. The performances of three kinds of iterative codes were evaluated in the environment of underwater acoustic communication channel that are real data collected in Korean east sea. The distance of transmitter and receiver was 5Km and data rate was 1Kbps. As a result, convolutional code based on BCJR algorithm has better performance in underwater channel than turbo codes and LDPC codes.
Key Words: 터보 등화기 Underwater acoustic communication;LDPC;Turbo codes;Turbo equalizer;BCJR

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