Outage Probability of Cognitive Relay Networks with Interference Constraints
Outage Probability of Cognitive Relay Networks with Interference Constraints
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DOI：
10.1109/twc.2010.120310.090852
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发表时间：
2011-02-01
影响因子：
10.4
通讯作者：
Hong, Daesik
中科院分区：
文献类型：
--
作者：
Lee, Jemin;Wang, Hano;Hong, Daesik
本文基于底层方法评估了次用户之间合作的认知中继网络的中断概率，同时遵守对主用户的干扰约束，即主用户可以容忍的有限干扰量。提供了适用于认知中继网络的中继选择标准，并使用它，我们得出了中断概率。结果表明，由于干扰约束，认知中继网络的中断概率高于传统中继网络，并且我们对这种增加进行了量化。此外，中断概率还受到干扰链路(次发射器和主接收器之间)与中继链路(次发射器和次接收器之间)的距离比的影响。我们还证明认知中继网络实现了与传统中继网络相同的全选择分集顺序，并且通过增加选择分集（中继数量）实现的中断概率的降低不小于传统中继网络。
This paper evaluates the outage probability of cognitive relay networks with cooperation between secondary users based on the underlay approach, while adhering to the interference constraint on the primary user, i.e., the limited amount of interference which the primary user can tolerate. A relay selection criterion, suitable for cognitive relay networks, is provided, and using it, we derive the outage probability. It is shown that the outage probability of cognitive relay networks is higher than that of conventional relay networks due to the interference constraint, and we quantify the increase. In addition, the outage probability is affected by the distance ratio of the interference link (between the secondary transmitter and the primary receiver) to the relaying link (between the secondary transmitter and the secondary receiver). We also prove that cognitive relay networks achieve the same full selection diversity order as conventional relay networks, and that the decrease in outage probability achieved by increasing the selection diversity (the number of relays) is not less than that in conventional relay networks.