Outage Performance of Underlay Cognitive Decode-and-Forward Opportunistic Relaying with Imperfect Channel State Information and Co-channel Interference

2014 International Conference on Computational Intelligence and Communication Networks Pub Date : 2014-11-14 DOI:10.1109/CICN.2014.79

Yuhua Ouyang, Ming Zhou, Xiangdong Jia

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Abstract

The outage performance of decode-and-forward cognitive ratio opportunistic relay (DF CR-OR) systems is investigated over Rayleigh fading environments. We specially consider the case where the systems are impaired by the imperfect channel state information (CSI) between the secondary users and the primary user, and by the co-channel interference (CCI) at secondary relays and destination. We first obtain the exact closed-form expression to outage probability of cognitive systems by considering jointly the impact of the imperfect CSI and the CCI. Secondly, the presented simulation results show that the curves' slops of outage probability are same for all different CSI or CCI. This indicates that diversity order of the interested cognitive systems is not influenced by the imperfect CSI and the CCI. At the same time, the simulated results also show that the imperfect CSI and the CCI cause the very severe loss in system outage performance even if they do not result in the loss in diversity order.

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不完全信道状态信息和同信道干扰下底层认知译码转发机会中继的中断性能

研究了在瑞利衰落环境下，译码转发认知比机会中继(DF CR-OR)系统的中断性能。我们特别考虑了次要用户和主用户之间的不完全信道状态信息(CSI)以及次要中继和目的地的同信道干扰(CCI)对系统的影响。首先通过综合考虑不完善的CSI和CCI的影响，得到了认知系统中断概率的精确封闭表达式。其次，仿真结果表明，对于不同的CSI或CCI，中断概率曲线的斜率是相同的。这表明感兴趣的认知系统的多样性顺序不受不完善的CSI和CCI的影响。同时，仿真结果也表明，不完善的CSI和CCI即使不造成分集顺序的损失，也会造成非常严重的系统中断性能损失。

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2014 International Conference on Computational Intelligence and Communication Networks

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