Outage probability of a multi-relay cognitive network with an uncertain number of forwarding relays

Yulin Hu, J. Gross, A. Schmeink
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引用次数: 6

Abstract

In this paper, we focus on a Cognitive Relay Network (CRN) where only the information of the average channel gains is available at the secondary source. A distributed multiple relay selection scheme is proposed for the secondary transmission. Since the secondary source does not fully control the selection but lets each secondary relay decide by itself, it doesn't know which and how many relays will participate in the forwarding. This brings a serious uncertainty in the number of forwarding relays. We analyze this uncertainty and derive the closed-form expression of the outage probability of the secondary transmission under the uncertainty. Finally, we evaluate the proposed relay selection scheme by means of simulation. The simulation shows the appropriateness of our analytical model. In addition, although having lower interference constraint at each relay, the performances of the proposed multi-relay CRN scheme are shown to be strictly superior to the single relay CRN. Moreover, the simulation results suggest that it is necessary to spend the general overhead for secondary networks on knowing the exact QoS requirement of the primary user (i.e. the interference violation probability) to apply our proposed relay selection scheme with the statistical total interference constraint.
转发中继数量不确定的多中继认知网络的中断概率
在本文中,我们关注的是认知中继网络(CRN),其中只有平均信道增益的信息在次要源是可用的。提出了一种用于二次传输的分布式多中继选择方案。由于辅助源没有完全控制选择,而是让每个辅助中继自己决定,因此它不知道哪些中继以及有多少中继参与转发。这给转发中继的数量带来了严重的不确定性。对这种不确定性进行了分析,导出了这种不确定性下二次输电停电概率的封闭表达式。最后,通过仿真对所提出的中继选择方案进行了评价。仿真结果表明了分析模型的正确性。此外,尽管每个中继的干扰约束较低,但所提出的多中继CRN方案的性能明显优于单中继CRN。此外,仿真结果表明,为了应用我们提出的具有统计总干扰约束的中继选择方案,需要花费辅助网络的一般开销来了解主用户的确切QoS需求(即干扰违反概率)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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