The Performance of Channel Code in OFDM Underwater Acoustic Communication

With the deepening of research on the ocean, the development of UAC(underwater acoustic communication)has become a hot issue of concern. OFDM and channel coding techniques greatly impact the improvement of UAC. In this paper, channel coding is combined with OFDM to improve the OFDM UACS(underwater acoustic communication system) performance by adding some channel codes. When the coding rate is 1/2, the error correction capability is poor and the error rate is higher than when the coding rate is 1/4. The performance is better when using 1/3 bit rate in Turbo coding compared to 1/2 bit. A performance gain of about 4 dB is obtained using LDPC channel coding. The channel coding and decoding methods of convolutional, Turbo and LDPC codes can significantly improve the performance of OFDM UACS.