System Utility Maximization With Interference Processing for Cognitive Radio Networks
System Utility Maximization With Interference Processing for Cognitive Radio Networks
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DOI：
10.1109/tcomm.2015.2412541
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发表时间：
2015-03
影响因子：
8.3
通讯作者：
L. Qian;Shengli Zhang;Wei Zhang;Y. Zhang
中科院分区：
文献类型：
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作者：
L. Qian;Shengli Zhang;Wei Zhang;Y. Zhang
在频谱底层认知无线电网络中，允许次要用户（SU）重复使用分配给主要系统的频谱。 SU 之间的干扰实际上携带信息，并且可以通过信息论干扰处理来潜在地提高网络性能。在本文中，我们基于称为Han-Kobayashi方案的容量逼近干扰处理方案，设计了一种最优联合功率和速率控制算法，该算法在主要用户的干扰温度约束下最大化次级系统效用。由于优化问题一般是非凸的，因此很难获得最优解。为了使优化问题易于处理，本文首先通过利用其隐藏单调性将问题转化为单调优化问题。然后，我们设计了一种有效的算法来获得 Han-Kobayashi 方案中联合功率和速率控制问题的全局最优解。该算法背后的关键思想是构造一系列收缩的多块，以不断增加的精度逼近可行区域的上边界。数值结果进一步表明，我们的方案所实现的效用明显优于将SU之间的干扰视为噪声的传统方案的效用。
In spectrum underlay cognitive radio networks, secondary users (SUs) are allowed to reuse the spectrum allocated to a primary system. The interference between SUs actually carries information and can potentially be exploited to improve the network performance through information-theoretic interference processing. In this paper, we design an optimal joint power and rate control algorithm that maximizes the secondary system utility subject to the interference temperature constraints of primary users based on the capacity-approaching interference processing scheme called as the Han-Kobayashi scheme. The optimal solution is difficult to achieve because the optimization problem is in general non-convex. To make the optimization problem tractable, this paper first transforms the problem into a monotonic optimization problem through exploiting its hidden monotonicity. We then devise an effective algorithm to obtain the global optimal solution to the joint power and rate control problem in the Han-Kobayashi scheme. The key idea behind the proposed algorithm is to construct a sequence of shrinking polyblocks that approximate the upper boundary of the feasible region with increasing precision. Numerical results further show that the achieved utility of our scheme significantly outperforms the utility of conventional schemes which treat the interference between SUs as the noise.