戴蒙天,杨维. 远距离磁感应透地通信信道容量分析[J]. 电波科学学报,2023,38(3):502-509 + 537. DOI: 10.12265/j.cjors.2022135
      引用本文: 戴蒙天,杨维. 远距离磁感应透地通信信道容量分析[J]. 电波科学学报,2023,38(3):502-509 + 537. DOI: 10.12265/j.cjors.2022135
      DAI M T, YANG W. Analysis on channel capacity of magnetic induction based long-distance through-the-earth communication[J]. Chinese journal of radio science,2023,38(3):502-509 + 537. (in Chinese). DOI: 10.12265/j.cjors.2022135
      Citation: DAI M T, YANG W. Analysis on channel capacity of magnetic induction based long-distance through-the-earth communication[J]. Chinese journal of radio science,2023,38(3):502-509 + 537. (in Chinese). DOI: 10.12265/j.cjors.2022135

      远距离磁感应透地通信信道容量分析

      Analysis on channel capacity of magnetic induction based long-distance through-the-earth communication

      • 摘要: 为优化远距离磁感应透地通信理论与技术,针对远距离磁感应透地通信场景收发线圈间耦合微弱的实际情况,提出了收发机天线采用单轴空气线圈时的信道容量分析方法. 基于毕奥-萨伐尔定律与地层介质涡流效应建立了透地通信磁感应强度模型,通过对收发电路进行等效变换,在考虑涡流效应的条件下计算接收机负载电阻所获得的接收功率;引入接收负载上的热噪声,根据香农公式可确定磁感应透地通信的信道容量. 仿真表明,远距离透地通信的透地信道容量随透地通信距离的增大而显著减小,但在数百米的透地通信距离下仍可以有数千到数百bit/s的信道容量. 通过合理设计透地通信的调制方式,有利于充分利用有限的透地信道容量,以使透地通信系统在较大透地通信距离下满足语音与信息的传输需求.

         

        Abstract: In order to improve the theory and technology of magnetic induction (MI) based long-distance through-the-earth (TTE) communication, aiming at the weak coupling between transmitter and receiver coils in the MI based long-distance TTE communication scenario, a method for analyzing the channel capacity for long-distance MI-based TTE communication with air coils as antennas of transceivers is presented. Firstly, the magnetic flux density model for TTE communication is established based on the Biot-Savard law and the effect of eddy currents of the earth media. By the equivalent transformation of the transceiver circuits, the received power on the load resistance of the receiver circuit is obtained in consideration of eddy currents. The thermal noise power of the load resistor of the receiver circuit is introduced to determine the channel capacity of the MI-based TTE communication according to Shannon formula. The simulation result shows that the channel capacity of the MI-based TTE communication decreases with the increasing of the TTE communication distance obviously. However, the TTE channel capacity may reach several thousand or hundred bit/s with several hundred meters of TTE distance. It is beneficial to make full use of the limited channel capacity by designing the modulation method of TTE communication properly and meet the requirements for voice and information transmission with long TTE distance.

         

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