2、的主要课题，分析了系统吞吐量、平均传输时延等性能指标。然后根据协议的工作过程，基于Matlab平台，构建仿真系统模型和具体的程序流程图，对npcsma进行建模仿真，对所得数据进行分析，得出系统吞吐量与业务量的关系以及延迟与业务量的关系。[关键字]：随机多址接入协议；ALOHA；np-CSMA；仿真；性能分析[Abstract ] To satisfy the communication between nodes, sharing resources is a common method, and the multiple access protocol is to solve ho
3、w the links can serve all the users with sharing resources efficiently and fairly. Random access technique, one kind of contention-type access protocols, solves how to reduce information collision, increase system throughput and channel utilization, like fixed access technique. The main idea of
4、 Random Multiple Access is that plurality of users share a communication channel and occupant it randomly, in the event of collision, they retransmit after waiting a while or discard after timeout.This paper firstly introduces the research background of the random multiple access protocol and i
5、ts working principle.ThepureALOHAprotocolandslottedALOHAprotocolaresummarized.Thenpcsmaprotocolisdescribedindetail.Thisisthemainresearchsubjectofthispaper.Thispaperanalyzesthesystemthroughput、averagetransmissiondelayandotherperformanceindicators.After that, according to the working process of t
6、he protocol, based on Matlab platform, we constructmodel of the simulation system and the program flow chart . Thesimulationofnpcsmaiscarriedout,andtherelationshipbetweenthroughputandtrafficvolumeisobtained.[Keywords]: Random multiple access protocol; ALOHA; np-CSMA; Simulation; Performance ana
