车联网中三种自适应协同通信算法性能比较

Performance Comparison of Three Adaptive Cooperative Communication Algorithms in VANETs

信息传输的快速性及其准确性是车联网(VANETs)中车辆间通信的关键,将协同通信引入车联网并针对不同情况选择合适的自适应协同通信算法十分重要。在车联网中,首先提出了三种不同的自适应协同通信算法,即随机选择传输路径算法(RP)、基于最佳信道特性的传输路径算法(OPCG)与基于丢包率最小的传输路径算法(OPLR);然后研究了不同路径衰落指数与不同中继节点运动速度下三种算法的系统误码率(SER)性能;最后比较三种算法的性能并分别给出了其相应的应用场景。仿真结果表明,OPCG算法性能最优,但车辆低速行驶时RP算法即可满足要求,OPLR算法则适用于时延不敏感的场景。

The rapidity and accuracy of information transmission is the key of vehicle communication in VANETs. Therefore,it is very important to select appropriate adaptive cooperative communication algorithms in different situations. Firstly,three different adaptive cooperative communication relay algorithms were proposed suitable for VANETs,which were random path algorithm,optimal path based on channel gain algorithm,and optimal path based on minimum packet loss rate algorithm. Secondly,the performance of the symbol error rate was studied based on three algorithms in the case of different path fading exponents and vehicle＇ speeds at the relay point. Finally,the corresponding application scenarios were given based on the comparison of three algorithms. Simulation results show that the performance of OPCG is optimal,but the simplest RP algorithm can meet the requirement when the vehicle runs at low speed.Also,OPLR is suitable for scenario which is insensitive to time delay.