基于脊髓码的人体介质信道编码技术研究  

Research on human body medium channel coding technology based on spinal code

作　　者：杨志良[1] 毛煜茹 王阳阳 孙兴丽 YANG Zhiliang;MAO Yuru;WANG Yangyang;SUN Xingli(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051

出　　处：《国外电子测量技术》2025年第1期48-53,共6页Foreign Electronic Measurement Technology

基　　金：山西省青年科学基金(202203021212141);山西省面上科学基金(202303021211151)。

摘　　要：针对可穿戴与医疗设备中无线信号在人体信道中传输信号衰减的问题,提出采用脊髓编码方法以提升无线信号在人体信道传输中的抗路径衰落与传输可靠性能。首先建立了人体介质信道模型,依据电磁波在有耗介质中的传播规律及人体组织的电磁特性,采用时域有限差分方法进行了柱形四肢模型以及人体模型的传输参数建模与仿真,分析得出人体信道路径损耗主要受信号中心频率与路径长度的影响。在此基础上,采用脊髓编码对非均匀人体介质信道进行了抗干扰性能提升,提出了脊髓编码在人体介质中的编码与译码方法。仿真结果显示,在保证信息在非均匀人体介质传输过程中传输参数较低的情况下,通过脊髓编码可提供25 dB的编码增益,可有效抵消由人体介质频率与传输长度引起的传输参数减小的影响,从而提升信息在人体信道中传输的可靠性。Regarding the problem of signal attenuation during the transmission of wireless signals in the human body channel in wearable and medical devices,a method of spinal code was proposed to enhance the anti-path loss and transmission reliability of wireless signals in the human body communication channel.Firstly,the characteristics of human body media were analyzed.Based on the propagation law of electromagnetic waves in lossy media and the electromagnetic characteristics of human tissues,the transmission parameters of cylindrical limb models and human models were modeled and simulated,and it was analyzed that the path loss of the human body channel was mainly affected by the signal center frequency and the path length.On this basis,the spinal coding was used to improve the anti-interference performance of the non-uniform human body medium channel.The coding and decoding methods of the spinal coding were given.The simulation results show that,under the condition of ensuring the low transmission parameters of the information in the non-uniform human body medium transmission process,the spinal coding may provide a coding gain of 25 dB,effectively compensate the effects of reduction transmission parameters caused by the frequency and transmission length of the human body medium,and thereby enhance the reliability of information transmission in the human body channel.

关 键 词：人体信道建模 时域有限差分 脊髓码 信道编码 信噪比 

分 类 号：TM911[电气工程—电力电子与电力传动]