煤矿物联网中自适应FEC的丢包恢复研究

摘要

煤矿井下巷道由于长距离多跳、环境影响等因素造成了井下无线传感器网络数据传输可靠性较差.提出自适应FEC的丢包恢复策略,该策略基于指数加权移动平均法估计信道的丢包率自适应地调整冗余,以簇为单位进行编译码转发,与其他自适应FEC算法相比,该策略计算过程简单,自适应精度较高.理论分析和仿真实验表明,该策略在长距离多跳网络中能以较少的冗余数据最大限度的恢复丢包,从而减少节点重传次数,提高了煤矿物联网的可靠性和实时性.%The reliability of underground wireless sensor networks data transmission sometimes is very poor because of many reasons of coal mine itself, like the long-distance multi-hop, the environmental influence and some other factors. An adaptive packet loss recovery strategy is proposed which adjusts the FEC redundancy according to the estimation of current packet loss rate based on EWMA. The cluster nodes are used as the unit for encoding-decoding and forwarding data in this strategy. Compared with other adaptive FEC algorithms, this strategy' s calculation process is simple and adaptive precision is higher. Theoretical analysis and simulation results show that this strategy can maximally recover the loss packets by the less redundant data in the longdistance multi-hop networks, thereby reducing the times of retransmissions and improving the reliability and real-time of the coal mines Internet of things.