单载波频域均衡高速水声通信仿真研究

High-speed Underwater Acoustic Communication Based on Single Carrier with Frequency Domain Equalization

基于判决反馈均衡器和二阶数字锁相环联合的水声通信接收机结构复杂,运算量大,对均衡器阶数及步长的选择敏感;基于正交频分复用的高速水声通信信号峰平功率比高,对频率偏移和多普勒非常敏感。针对这些问题,提出了单载波频域均衡高速水声通信方法。该方法计算量低,无峰平功率比问题,对频率偏移不敏感。仿真结果表明:单载波频域均衡方法具有抗固定相位偏移的能力,对高速水声通信具有很强的应用价值。

Cyclic prefixed single carrier transmission with frequency domain equalization （SC-FDE） for high-speed phase coherent underwater acoustic （UWA） communication was proposed. The system performance of SC-FDE over an UWA channel model was analyzed, simulated and compared with that of single carrier time domain adaptive DFE equalization embedded second order digital phase locked-loop and orthogonal frequency division multiplexing （OFDM） based UWA communication. The impact of diversity on the performance of SC-FDE in UWA was studied. The numerical simulation results show performance advantage of the SC-FDE scheme, such as low receiver complexity, computation and the ability of compensate phase offset and frequency selective fading.