Distributed Power Control With Robust Protection for PUs in Cognitive Radio Networks
Distributed Power Control With Robust Protection for PUs in Cognitive Radio Networks
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DOI：
10.1109/twc.2015.2403357
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发表时间：
2015-02
影响因子：
10.4
通讯作者：
Shimin Gong;Ping Wang;Lingjie Duan
中科院分区：
文献类型：
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作者：
Shimin Gong;Ping Wang;Lingjie Duan
在认知无线电网络中，由于主用户和主用户之间的信道信息不完整或错误，次用户(SU)在主用户(PU)的接收端估计和控制他们的干扰是具有挑战性的。因此，SU需要估计PU接收器处的最坏情况的合计干扰，以确保针对PU的过度干扰提供有保证的保护。由于很少有所有SU-PU信道同时经历最坏情况，我们提出了一种实用的SU-PU信道模型(即最坏情况选择稳健模型)来估计它们的总干扰功率。该模型使用一个可调整的参数来控制处于最坏情况下的SU-PU信道的数量。对于单个SU-PU信道，最坏情况下的信道增益的估计受到分布不确定性的影响。在此稳健模型下，我们研究了非合作博弈中SU的功率控制问题，其中每个SU自私地最大化其在PU接收端的耦合干扰约束下的吞吐量性能。我们研究了纳什均衡的存在唯一性，并提出了一种分布式实现纳什均衡的迭代算法。数值结果表明，在SU-PU信道信息不确定的情况下，该算法为PU提供了有保障的保护，为SU提供了公平的吞吐量性能。
In cognitive radio networks, it is challenging for secondary users (SUs) to estimate and control their interference at the receivers of primary users (PUs), due to incomplete or erroneous channel information between SUs and PUs. Thus, SUs need to estimate the worst-case aggregate interference at PU receivers to ensure guaranteed protection for PUs from excessive interference. As it is rare that all SU-PU channels experience the worst-case conditions simultaneously, we propose a practical model (namely, the worst-case selective robust model) for SUs to estimate their aggregate interference power. This model employs an adjustable parameter to control the number of SU-PU channels that are in the worst-case conditions. For an individual SU-PU channel, the estimation of worst-case channel gain is subject to a distribution uncertainty. Given this robust model, we study SUs' power control problem in a non-cooperative game where each SU selfishly maximizes its own throughput performance subject to coupled interference constraints at PU receivers. We study the existence and uniqueness of Nash equilibrium and propose an iterative algorithm for SUs to achieve the equilibrium in a distributed manner. Numerical results show that our algorithm provides guaranteed protection for PUs and fair throughput performance for SUs, provided with uncertain SU-PU channel information.