协同时隙ALOHA随机存取网络最大稳定吞吐量性能的研究

针对非合作时隙ALOHA无线随机存取网络、未知信道状态信息(CSI)的协同时隙ALOHA无线随机存取网络和已知CSI的协同时隙ALOHA无线随机存取网络3种情况,分析并比较了系统所能达到的最大稳定吞吐量(即保证系统稳定时每个用户数据分组的最高到达率)的性能。仿真结果验证了理论推导的正确性,结果表明:用户之间的协同合作将有利于系统整体性能的提高,如果已知CSI的话更是如此。研究结果对采用时隙ALOHA协议的任何协同无线随机存取网络的实施和部署具有理论和实践指导意义。

A Study on the Performance of the Maximal Stable Throughput in the Cooperative Slotted ALOHA Random Access Networks

In this study,the performances of the achievable maximal stable throughput of the system,which is defined as the maximum arrival rate that each user can accommodate without causing the queues to become unstable,are discussed and compared in three different slotted ALOHA wireless random access systems.They are non-cooperative slotted ALOHA wireless random access system,cooperative slotted ALOHA wireless random access system without and with channel state information（CSI）.The simulation results verify the correctness of the theoretic derivations and show that the system＇s stable performance can be further improved when users cooperate by relaying each other＇s messages to the destination,especially by exploiting the knowledge of the local channel state information.The study has important academic and practical significance for its the realization and deployment of any cooperative wireless random access system using slotted ALOHA protocol.