Optimal Power Allocation for Relay Assisted Cognitive Radio Networks

L. S. Jayasinghe, Nandana Rajatheva
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引用次数: 30

Abstract

In this paper, we study the optimal power allocation of wireless relay nodes which are used in the secondary user (SU) communication of a cognitive radio (CR) network. We consider the behavior of transmitting powers of SUs where those powers are limited to the tolerable interference as seen by the primary user (PU) communication. To improve the performance of the secondary communication based on minimizing the outage probability, we re-formulate the power allocation problem with a new set of constraints. These are obtained by considering the co-channel interference generated by the SU communication to the PU communication. The power allocation problem is solved for both regenerative and non regenerative relay models under Rayleigh fading conditions. SU communication with N number of relays is discussed and compared. The outage probability of SU communication is limited by the interference power threshold (IPT) constraints of PUs and is affected significantly by the IPT levels of PUs.
中继辅助认知无线网络的最优功率分配
本文研究了认知无线电(CR)网络中用于辅助用户通信的无线中继节点的最优功率分配问题。我们考虑单元的发射功率行为,其中这些功率被限制在主用户(PU)通信所看到的可容忍干扰范围内。为了在最小化中断概率的基础上提高二次通信的性能,我们用一组新的约束条件重新表述了功率分配问题。这些是通过考虑SU通信对PU通信产生的同信道干扰而得到的。解决了瑞利衰落条件下再生中继和非再生中继的功率分配问题。讨论并比较了N个中继的SU通信。SU通信的中断概率受pu的干扰功率阈值(IPT)约束的限制,并且受pu的干扰功率阈值水平的显著影响。
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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