能量高效的事件驱动型大规模农业监测WSNs协作式传输策略

摘要

针对农作物分布广泛、农业环境恶劣的特点,利用协作式多输入多输出技术具有的低能耗、高可靠特性,结合事件驱动型农业监测的无线传感器网络,提出了能量高效的基于空时分组码的多跳协作式多输入多输出传输策略.该策略建立了包括节点剩余能量、最优跳距等因素的综合多跳路由;此外,还建立了精确的能耗模型,确定了满足网络最小能耗时的协作节点个数和最优跳距.仿真结果表明,通过能耗模型求出的最优跳距和协作节点个数减少了能量消耗;同现有的无线传感器网络中具有能量效率和事件聚类的自适应路由协议相比,提出的传输策略能显著地提高能量有效性和延长网络寿命.%Aiming at event-driven large-scale agricultural monitoring wireless sensor networks, an energy-efficient Cooperative multiple input multiple output(CMIMO) multi-hop transmission scheme based on Space-time block code (STBC) is proposed, which utilizes low energy and high reliability characteristics of CMIMO technology. The scheme establishes the comprehensive multiple-hop relay routing rule considering the residual energy available of nodes, optimal hop distance and other factors. The detailed energy consumption model is established to solve the optimal hop distance and number of cooperative nodes that minimize network energy consumption. The simulation results show that the optimal hop distance and number of cooperative nodes solved by the energy consumption model reduce energy consumption, the proposed scheme can improve energy efficiency and lengthen network lifetime obviously compared with the existing adaptive routing protocol with energy efficiency and event clustering for wireless sensor networks protocol.