现有的滤波器组多载波调制（FBMC）水声通信受到稀疏信道和环境噪声的影响，存在着误码率高的问题，判决反馈均衡器对于水声FBMC的接收信号有着一定的均衡效果；但是，判决反馈均衡仍存在着误码扩展的问题。本文提出了被动时间反转和双向判决反馈均衡联合的均衡方法，能够有效压缩稀疏信道长度，减少误码扩展。仿真结果表明，相比于被动时间反转和判决反馈联合的均衡方法，本文方法对于水声FBMC通信系统接收端信号的复原效果有着较大的提升。
The existing filter bank multi-carrier modulation (FBMC) underwater acoustic communication has the problem of high bit error rate because of the influence of sparse channel and ambient noise. Decision feedback equalizer has a certain effect on the received signals of underwater acoustic FBMC. However, the problem of error propagation still exists in decision feedback equalization. In this paper, a joint equalization method combining passive time reversal and bidirectional decision feedback equalization is proposed. This method can effectively compress the sparse channel length and reduce the error propagation. The simulation's results show that compared with the joint equalization method of passive time reversal and decision feedback equalization, the proposed method can improve recovery performance of receiver signal greatly in underwater acoustic FBMC system.
2019,41(11): 152-154,159 收稿日期：2018-09-08
DOI：10.3404/j.issn.1672-7649.2019.11.031
分类号：TN929.3
基金项目：国家自然科学基金（11574120，U1636117），江苏省自然科学基金（BK20161359），江苏省“六大人才高峰”计划资助，水声对抗技术重点实验室基金
作者简介：杨定康(1993-),男,硕士研究生,主要研究方向为水声FBMC系统信道估计和均衡技术
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