智能交通系统中CMIMO-SM-ARQ协议性能建模分析

为提高智能交通系统(ITS)中无线传感器网络(WSN)的吞吐量和能效性能,提出了一种具备空间调制的协同多输入多输出自动重传请求(CMIMO-SM-ARQ)协议.考虑了双发送节点和双接收节点的四节点WSN,其接收节点可以互为中继辅助发送端传输数据,以降低系统中断概率.建立了具有3L+1个状态的CMIMO-SM-ARQ协议离散时间马尔可夫链(DTMC)模型,并给出状态空间.根据WSN的中断概率和一步状态转移概率矩阵推导CMIMO-SM-ARQ协议的吞吐量、能效和时延性能解析表达式.数值模拟结果表明,所提协议的中断概率和能效性能优于单输入单输出自动重传请求(SISO-ARQ)协议,在中远距离(大于67 m)传输信息时,CMIMO-SM-ARQ具有较高的吞吐量和较低的时延.

Performance modeling and analysis of CMIMO-SM-ARQ protocol in ITS

To improve the throughput and energy efficiency of wireless sensor networks(WSNs) in intelligent transportation system(ITS), this paper proposed a cooperative multiple input multiple output automatic repeat request protocol with spatial modulation(CMIMO-SM-ARQ). Consider a four-node WSNs with dual sending nodes and dual receiving nodes, in which both receiving nodes could act as relays to each other to assist the sender transmitting data, to reduce the probability of system outage. The paper established the discrete time Markov chain(DTMC) model of CMIMO-SM-ARQ protocol with 3L+1 states and gave the state space. Based on the outage probability of WSNs and the one-step state transition probability matrix, it derived the analytical expressions of throughput, energy efficiency and delay of CMIMO-SM-ARQ protocol. Numerical simulation results show that the outage probability and energy efficiency of the proposed protocol are better than the single input single output automatic repeat request(SISO-ARQ) protocol, and the CMIMO-SM-ARQ protocol has a higher throughput and lower delay when transmitting information at medium and long distances(over 67 m).