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The performance of underwater acoustic communication system is sensitive to the ISI(Inter-Symbol Interference) due to delay spread develop of multipath signal propagation. The equalizer is used to combat the ISI. In this paper, the performances of underwater acoustic communication with turbo equalizer were evaluated by real data collected in Korean littoral sea. As a result, when one iterative decoding using turbo equalizer is applied, the performance was improved 1.5 dB than the case of the non-iterative equalizer at BER . In the case of two or three iterations the performance was enhanced about 3.5 dB, but the performance wasn`t improved any more in the case of more than three times.

Performance Analysis of Underwater Acoustic Communication Systems with Turbo Equalization in Korean Littoral Sea