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为解决无线传感器网络(Wireless Sensor Networks,WSNs)的能量效率问题,构建了两跳WSNs系统模型.针对两跳模型中的中继选择策略进行了优化,分别提出了切换检测合并(Switch-and-Examine Combining,SEC)、带后验选择的切换检测合并(Switch-and-Examine Combining with post-selection,SECps)中继选择策略,节省了中继节点的检测次数,从而节省了系统能耗.在中继处加入协作MIMO的思想,进一步提升了系统的能效性能.理论和仿真结果表明,本文提出的SEC和SECps中继选择策略在能效性能上均比传统的选择合并(Selection Combining,SC)策略优越,特别是SEC策略在牺牲中断概率性能的情况下能效性能最好.
In order to solve the problem of energy efficiency in Wireless Sensor Networks (WSNs), a two-hop WSNs system model is constructed.Aiming at the optimization of relay selection strategy in two-hop model, the switch-and- Examine Combining, SEC), and SECps relay selection strategy with posterior selection, saving the relay detection times and saving system energy consumption. The idea of collaborative MIMO is added at the relay to further improve the energy efficiency performance of the system.The theoretical and simulation results show that the SEC and SECps relay selection strategies proposed in this paper are superior to the traditional Selection Combining (SC) Superiority, especially the SEC strategy, has the best energy efficiency performance at the expense of the probability of outage.