医学设备的抗干扰无线接入方案

摘要

无线网络中的射频传输往往会对敏感的电子医学设备造成电磁干扰,影响其正常运行。而传统的无线接入方案并没有考虑电磁干扰问题。为了解决该问题本文提出了一种新的抗干扰无线接入方案。所提方案在能解决隐藏终端的RTS/CTS协议基础上引入功率控制,通过限制医疗环境中无线非医疗设备的发送功率来避免其对医学设备造成的电磁干扰。仿真结果表明:同传统的IEEE802.11无线接入方式相比较,本文提出的方案在牺牲一部分通信性能的情况下,可以有效的降低对医学设备的干扰概率。根据对结果的分析,本文还会进一步地优化所提方案。Radio frequence (RF) transmission in wireless network tends to cause electromagnetic interference (EMI) to sensitive electronic medical equipments, affecting their normal operation. The traditional wireless access schemes do not consider the electromagnetic interference. In order to solve this problem, this paper proposed a new anti-interfer- ence wireless access scheme. The proposed scheme introduces the power control based on RTS/CTS agreement which can solve the hidden terminal problem. It limits the transmission power of wireless non-medical equipments in medical environment to avoid its electromagnetic interference to medical equipments. Simulation results show that, compared with traditional IEEE 802.11 wireless access scheme,the proposed scheme can effectively avoid electromagnetic interference to electronic equipments by sacrificing some performance of communication system. According to the analysis of the results, this paper can further optimize the proposed scheme.