Outage performance of relay assisted hybrid overlay/underlay cognitive radio systems
Outage performance of relay assisted hybrid overlay/underlay cognitive radio systems
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DOI：
10.1109/wcnc.2011.5779452
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Zhi Yan;Xing Zhang;Wenbo Wang
中科院分区：
文献类型：
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作者：
Zhi Yan;Xing Zhang;Wenbo Wang
针对中继辅助的重叠/重叠混合认知无线电系统，在考虑峰值干扰功率限制的情况下，推导了次系统在功率限制下的中断概率上界。结果表明，在一定门限之前，次系统的中断性能随最大容许干扰功率的增大而提高，超过门限后，次系统的中断性能基本不变。研究结果还表明，在这种认知无线电系统中，更多的中继可以提供更高的分集增益，以获得更好的中断性能。研究还表明，二次系统的停电性能受一次网络的活动行为影响，而中继协作可以减小这种影响。
In this paper, considering a relay assisted hybrid overlay/underlay cognitive radio system with peak interference power constraints for protecting the primary system, the upper bound of outage probability of secondary system with power limit is derived. The results show that the outage performance of secondary system improves with the increase of maximum tolerated interference power before a specific threshold, but it keeps unchanged after the threshold. The results also show that more relays can provide higher diversity gain to get better outage performance in this kind of cognitive radio system. It is also indicated that the outage performance of secondary system is affected by the activity behavior of primary network, and relay cooperation can decrease this kind of affection.