Optimal Energy-Efficient Sensing and Power Allocation in Cognitive Radio Networks
Optimal Energy-Efficient Sensing and Power Allocation in Cognitive Radio Networks
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DOI：
10.1155/2014/694254
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发表时间：
2014-08
影响因子：
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通讯作者：
Xia Wu;Jin-Ling Xu;Ming Chen;Junbo Wang
中科院分区：
文献类型：
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作者：
Xia Wu;Jin-Ling Xu;Ming Chen;Junbo Wang
针对能量有效的认知无线电网络（CRN），研究了感知参数和功率分配的联合优化问题。最大化CRN能量效率的优化问题被配制为两个变量的函数，这两个变量是感测时间和发射功率，受到对PU的平均干扰功率和目标检测概率。在优化过程中，服务质量参数（次级用户（SU）可接受的最低速率）也被考虑在内。分析了最优解，提出了一种结合分式规划的CRN能量效率最大化算法。仿真结果表明，感知时间和功率分配的联合优化可以有效提高系统的性能。
We consider a joint optimization of sensing parameter and power allocation for an energy-efficient cognitive radio network (CRN) in which the primary user (PU) is protected. The optimization problem to maximize the energy efficiency of CRN is formulated as a function of two variables, which are sensing time and transmit power, subject to the average interference power to the PU and the target detection probability. During the optimizing process, the quality of service parameter (the minimum rate acceptable to secondary users (SUs)) has also been taken into consideration. The optimal solutions are analyzed and an algorithm combined with fractional programming that maximizes the energy efficiency for CRN is presented. Numerical results show that the performance improvement is achieved by the joint optimization of sensing time and power allocation.