叠加编码技术在水声OFDM通信系统中的应用研究

Applied research on superposition coding technology in underwater acoustic OFDM communication system

正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)通信技术由于具有频谱利用率高、抗多径能力强等优点,成为当前水声通信的研究重点和热点。在保证鲁棒性能的前提下,为了能够进一步提高其吞吐量,将叠加编码(Superposition Coding,SC)技术应用于水声OFDM通信系统中,在保证基本信号的同时获得额外的信息。仿真结果和水池实验结果表明:通过选择合适的功率分配因子,叠加编码在保证两路信号误比特率性能的前提下,可以提高系统的吞吐量,具有很好的应用前景。

Orthogonal frequency division multiplexing（OFDM） technology has become the research focus and hotspot in underwater acoustic communications owing to its advantages such as high spectrum efficiency and robustness to multipath fading. To improve the throughput of the system under the premise of guaranteeing the robust performances, superposition coding technique has been used in the underwater acoustic OFDM system which can transmit multiple data simultaneously. Simulation and experimental results show that the superposition coding technique can improve the throughput of the system under ensuring the BER performance of two signals, which have a very good application prospect.