考虑到现实水声通信环境中存在非连续频带干扰导致系统的接收端误码率较高的问题，本文提出一种基于索引调制的FBMC水声抗干扰通信（filter bank multi-carrier with index modulation, FBMC-IM）技术研究方案。首先分析无干扰情况下，水声FBMC-IM通信系统误码率性能要优于传统FBMC系统。根据非连续频带干扰频率范围，对水声FBMC-IM系统的通信频带进行划分，使得与非连续频带干扰信号混叠部分的子载波静默，未受干扰的子载波保持活跃状态并承载通信信号，实现不连续的通信频带划分来规避干扰的影响。仿真实验结果表明，该方案明显降低了系统接收端的误码率，提高了系统的抗干扰能力。
Considering the high bit error rate of the receiver caused by discontinuous band jamming in the real underwater acoustic communication environment, this paper presents an underwater filter bank multi-carrier system with index modulation (FBMC-IM). The bit error rate performance of underwater acoustic FBMC-IM communication system is analyzed to be better than that of traditional FBMC system. According to the jamming range of the discontinuous frequency band, the communication band of the underwater acoustic FBMC-IM system is divided, the subcarriers overlapped with discontinuous jamming are silenced and undisturbed subcarriers are activated and carry symbols, which avoids jamming by dividing discontinuous frequency bands. The simulation results prove that the proposed method obviously reduces the bit error rate and improves the anti-jamming capability of the system.
2022,44(17): 126-131 收稿日期：2021-06-21
DOI：10.3404/j.issn.1672-7649.2022.17.025
分类号：TB929.3
基金项目：国家自然科学基金资助项目(52071164)
作者简介：张明亮(1995-)，男，硕士研究生，研究方向为水声通信，水声信号处理
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