基于捕获与退避的多信道时隙ALOHA协议性能分析

摘要

To extend the theoretical analysis in multi-channel slotted ALOHA protocol based on power capture and backoff,some important performance measures including access success ratio,throughput and delay performance were analyzed.The protocol performance is dependent on channel load,power capture radio,the number of channels and the number of terminals.By the numerical simulation,the parameter influence on the system performance was analyzed.It is shown that smaller power capture radio lead to larger throughput,shorter delay and higher access success ratio; the larger number of channels also results in larger throughput,shorter delay and higher access success ratio.The impact of the number of terminals on throughput and access success ratio is small,and for smaller the number of terminals,delay is longer.The relative error between the theoretical results and the simulation ones was less than 2％.%为拓展对基于功率捕获和退避重发的多信道时隙ALOHA协议理论分析,对该协议的数据包接人成功率、吞吐量和时延等性能指标进行了研究.分析结果表明,协议性能由信道负载、功率捕获比例、信道数量和用户数量等参数共同决定.通过数值分析探讨了该协议中各参数对系统性能的影响.功率捕获比例越小,系统的吞吐量越大,时延越小,接入成功率就越高；信道数量越多,系统的吞吐量越大,时延越小,接入成功率就越高；用户数量对系统的吞吐量和成功接入率影响不大,而用户数量越大,系统的时延越大.理论结果与仿真结果相比,相对误差小于2％.