ITS自适应CMIMO-SM-ARQ性能建模分析

Performance modeling analysis of ITS adaptive CMIMO-SM-ARQ

为进一步基于无线传感器网络(WSNs)提升智能交通系统(ITS)中具有空间调制的协同多输入多输出自动重传请求(CMIMO-SM-ARQ)协议的系统性能,提出接收节点自适应CMIMO-SM-ARQ协议.该协议在信道质量差的情况下会激活接收端的节点以辅助接收数据,能够在降低信息传输中断概率的同时提高系统的能效性能.建立了离散时间马尔科夫链(DTMC)模型,求解其稳态分布,推导出自适应CMIMO-SM-ARQ协议的中断概率、吞吐量及能效解析表达式.数值模拟结果表明:所提协议性能优于非自适应CMIMO-SM-ARQ和单输入单输出自动重传请求(SISO-ARQ)协议.

To further improve the system performance of cooperative multiple input multiple output automatic retransmission request(CMIMO-SM-ARQ)protocol with spatial modulation in intelligent transportation system(ITS)based on wireless sensor networks(WSNs),an adaptive CMIMO-SM-ARQ protocol for receiving nodes was proposed.In the case of poor channel quality,this protocol would activate the receiving nodes to assist in receiving data,so as to reduce the outage probability of information transmission and improve the energy efficiency of the system.A discrete time Markov chain(DTMC)model was established to solve its steady state distribution,and the analytical expressions for the outage probability,throughput and energy efficiency of the adaptive CMIMO-SM-ARQ protocol were derived.Numerical simulation results show that the performance of the proposed protocol is better than that of non-adaptive CMIMO-SM-ARQ and single input single output automatic retransmission request(SISOARQ)protocol.