水声通信中单载波频域均衡器设计方法

Design of Single Carrier Frequency Domain Equalization for Underwater Acoustic Communication

针对水声通信中由多径时延引起的码间干扰(ISI)问题,提出了单载波频域均衡器(SC-FDE)的结构和参数设计,以及联合迭代均衡和信道估计(JECE)算法。该方法联合了基于训练与面向判决信道频域估计,并以均衡器反馈信号的可靠度作为判决门限,选择最佳信道估计值,用于均衡器的前馈及反馈滤波器系数的计算。仿真表明,采用非线性结构的单载波频域均衡相比线性结构均衡器具有更好的误比特率性能,对存在严重ISI的水声信道具有更好的适应性及可实现性。

In order to effectively offset the inter-symbol interference （ISI） caused by the multipath delay of underwater acoustic IUWA ） communication, the structure and parameters of single carrier frequency domain equalization （SC- FDE） were studied. The performance arid complexity of linear and nonlinear structures, different system parameters were contrasted in UWA channel models employing the algorithm of jointing iterative equalization and channel estimation （JECE）. Simulation results showed that the nonlinear SC-FDE demonstrated superior bit error rate （BER） performanee, and had better adaptability for the UWA channel existing serious ISI.