超声波透金属通信中信道交织器的设计和性能分析  

Channel interleaver design and performance analysis for ultrasonic through-metal communication

作　　者：许琳森 杨维[1] 田洪现[1] XU Linsen;YANG Wei;TIAN Hongxian(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《通信学报》2022年第10期1-11,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62071032)。

摘　　要：针对超声波透金属(UTM)信道所产生的连续错误比特问题,提出了一种UTM通信的多输入信道交织器。利用多输入交织器的分组思想和UTM信道功率增益的周期振荡特性,首先将编码比特进行分组,使每组比特的错误概率变化平缓;然后对每组的编码比特进行移位和矩形交织,这样不仅保证了同一组的交织比特分散在不同的振荡周期中,避免了连续的比特都具有较高的错误概率,而且保持了原有的比特位置序列,降低了不等差错保护(UEP)的影响;最后分析了随机交织器和所提交织器的近似误比特率性能,并通过仿真进行了验证。仿真结果表明,所提交织器提高了UTM通信系统的频率分集,在高信噪比时具有比随机交织器更低的误比特率。Aiming at the problem that the UTM channel can produce successive error bits,a multiple input channel interleaver for UTM communication was proposed.By taking advantages of the grouping idea in multiple input interleaver and the periodic oscillation characteristic of the power gain in the UTM channel,encoded bits were first divided into several groups so that error probabilities of bits in each group varied smoothly.And then,the shift operation and the rectangular interleaver were applied to encoded bits in each group.This not only ensured that interleaved bits in the same group were dispersed into different oscillation cycles,which avoided that the successive bits suffer the high error probability,but also maintained the original bit position sequences,which reduced the influence of UEP.Approximate BER performances for the random interleaver and the proposed interleaver were analyzed and verified by simulation.Simulation results indicate that the proposed interleaver increases the frequency diversity of the UTM communication system and has a lower BER than the random interleaver at high SNR.

关 键 词：超声波 透金属通信 正交频分复用 比特交织编码调制 多输入交织器 不等差错保护 

分 类 号：TN92[电子电信—通信与信息系统]