磁感应通信信道容量研究

摘要

作为新兴的通信技术,磁感应通信能在很多特殊环境中替代电磁波通信,比如在地下、水中、海岸附近和洞穴中.信道的容量是通信系统的一个重要技术指标.首先分析了磁感应通信系统的传输功率比,通过对其路径损耗的分析,估算出了3 dB带宽,然后计算出了其信道容量.同时分析了能够影响远距离信道容量的一些关键因素.研究结果发现,线圈的半径和Q值越大,远距离的信道容量就越大.%Magnetic Induction (MI) communication has been an emerging communication technology to alternate EM communication in some environments, such as underground, littoral environment, underwater environment and caves. The capacity is one of the important identities of a communication system. In order to calculate the channel capacity, this paper first calculates the transmission power ratio of MI communication system, then analyzes its path loss and 3dB bandwidth. By analyzing the power ratio, some key factors that can influence the channel capacity are found out. The simulation results show that radius of coil and Q value can significantly influence the capacity.