有限反馈机会中继通信系统的中断概率性能

该文针对放大转发机会中继通信系统,研究了有限反馈条件下系统的中断概率及分集性能。在有限反馈条件下,量化误差将影响最优中继的选择进而恶化机会中继通信系统的性能。该文首先推导了有限反馈条件下机会中继系统的中断概率近似表达式,并在此基础上分析获得两个结论:在有限反馈条件下,无论备选中继数目为何,系统的分集阶数可达且只可达到2;当备选中继个数一定时,随着反馈比特数的增加,系统中断概率将趋近于选择最佳中继节点所能获得的性能。仿真结果验证了中断概率的理论表达式及其分析结论,可为有限反馈条件下的中继传输协议设计提供理论支持。

Outage Performance of Opportunistic Relaying Systems with Limited Feedback

In this paper,the outage performance and diversity gain of amplify-and-forward opportunistic relaying systems under the constraint of limited feedback are studied.With limited feedback,the quantization error of Channel State Information(CSI) will impact the distinguishing of the best relay and worsen the system performance.Considering this issue,the outage performance is studied and its approximate analytical expression is derived for opportunistic relaying systems with limited feedback.Further,the following two propositions are analyzed and proved: with limited feedback,no matter how many potential relays in cooperation,the diversity order can and only can be 2;with the increasing accuracy of feedback,the outage probability approaches to that of the ideal opportunistic relaying systems.Simulation results verify the analytical expression of the outage probability and the proposed propositions,which provide a theoretical support for the design of relaying protocols under the constraint of limited feedback.