非理想信道条件下多用户多向中继系统的性能分析  

Performance Analysis of the Multi-User Multi-Way Relaying Under the Influence of Channel Estimation Error

作　　者：陈卓[1] 蔡跃明 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《信号处理》2014年第2期149-154,共6页Journal of Signal Processing

基　　金：国家自然科学基金项目(61001107);国家科技重大专项项目(2010ZX03006-002-04)

摘　　要：相比于普通双向中继通信系统,多用户多向中继能够更大限度地提高系统性能,本文中,我们分析了非理想信道状态信息下,多用户多向中继系统在受到信道估计误差影响时的性能。首先,基于提出的通信系统模型,我们得到各用户端信噪比表达式。然后,我们分别针对对称业务与不对称业务两种情况,推导出多用户多向中继系统的总可达速率表达式。最后,我们设计了一种基于迫零准则的收发波束赋形方法。数值仿真分析了信道估计误差对该系统中断概率的影响,以及对称业务与不对称业务下信道估计误差对系统总速率的影响。The multi-user multi-way relay system enjoys a high system capacity and practical value in comparison with two-way relay system.The required number of communication phases for the system is equal to the number of nodes in the system.In this paper,with the imperfect channel state information,we analyze the performance of the multi-user multi-way relaying under the influence of channel estimation error.First of all,we derive the end-to-end signal-to-noise ratio based on the system model.Then,considering symmetric traffic and asymmetric traffic,a total assessable rate expression for the multi-user multi-way relaying system is derived.Finally,the simulation confirms the correctness of the theoretical analysis.The effect of channel estimation error on the outage probability of the system and the system capacity of the symmetric and asymmetric traffic is also analyzed through numerical results.

关 键 词：多用户多向中继 信道估计误差 中断概率 系统总速率 

分 类 号：TN911.23[电子电信—通信与信息系统]