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针对码分多址(CDMA)宏大区制下,基于时隙ALOHA的随机接入吞吐量小、接入时延大等问题,提出了一种基于扩频ALOHA多址接入(SAMA)方案。在建模过程中,考虑了多径对冲突区间影响,以及业务信道引起的多址干扰(MAI)等因素,推导了吞吐量及分组平均传输时延的理论公式,并与时隙ALOHA进行了对比分析,给出了仿真和数值结果。结论表明:SAMA有相对较好的随机接入性能,可大大降低分组平均传输时延,在随机接入信道负载较重情况下尤为明显;多径及业务信道对扩频ALOHA接入性能有较大影响。
Aiming at the problems of code division multiple access (CDMA) macrodiversity, such as the random access throughput based on time slot ALOHA and large access delay, a spread spectrum ALOHA multiple access (SAMA) scheme is proposed. In the process of modeling, taking into account the influence of multipath to collision range and multiple access interference (MAI) caused by traffic channel, the theoretical formula of throughput and packet average transmission delay is deduced and compared with slot ALOHA Comparative analysis gives the simulation and numerical results. The results show that SAMA has relatively good random access performance, which can greatly reduce the packet average transmission delay, especially when the random access channel is heavily loaded. The multipath and traffic channels have more performance on spread spectrum ALOHA access Great influence.