基于LQI的WSN自适应差错控制方案

摘要

Aiming at the characteristics of high bit error rate and energy constraints on Wireless Sensor Network(WSN), this paper proposes an adaptive error control scheme based on Link Quality Indicator(LQI). The PHY specification of IEEE802.15.4 provides accurate measurements of channel quality for WSN, according to the quantitative relationship between LQI and packet error rate, it divides the channel quality into eight levels non-uniformly, furthermore, eight different BCH codes are chosen correspondingly. The motes choose optimal BCH codes as their error correction scheme in real time. Experimental results show the scheme has high energy efficiency, meanwhile, drops the packet error rate effectively.%针对无线传感器网络(WSN)中信息传输误码率高和能量受限的问题,提出一种基于链路质量指示(LQI)的自适应差错控制方案.利用IEEE802.15.4协议的物理层规范为无线传感器网络提供精确的信道质量评估,根据LQI与误包率之间的数量关系,将信道质量非均匀地划分为8个等级,并选择8种BCH码与之对应,在节点通信过程中实时地选择最佳的BCH码作为纠错码.实验结果表明,该方案具有较高的能量效率,能够有效降低误包率.