Optimal Power Allocation for Hybrid Overlay/Underlay Spectrum Sharing in Multiband Cognitive Radio Networks
Optimal Power Allocation for Hybrid Overlay/Underlay Spectrum Sharing in Multiband Cognitive Radio Networks
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DOI：
10.1109/tvt.2012.2235152
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发表时间：
2013-05
影响因子：
6.8
通讯作者：
Junni Zou;H. Xiong;Dawei Wang;Chang Wen Chen
中科院分区：
文献类型：
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作者：
Junni Zou;H. Xiong;Dawei Wang;Chang Wen Chen
在本文中，我们考虑在多频带认知无线电（CR）网络中的功率分配，其中多个次要用户（SU）通过一个共同的中继传输和竞争的中继的发射功率。我们采用了一种混合覆盖/频谱共享方案，允许SU适应其访问授权频谱的主要用户（PU）的状态的方式。如果检测到PU在所选信道处空闲，则SU工作在覆盖模式;否则，其工作在频谱覆盖模式。此外，提出了一种基于拍卖的功率分配方案来解决多个SU之间的功率竞争问题。对于频谱覆盖中的SU，中继按照支付的比例分配功率，而不需要额外的约束;对于频谱覆盖中的SU，其自身的发射功率和中继的发射功率对于PU的服务质量（QoS）是有上限的。然后，从理论上分析了所提出的拍卖算法的收敛性和二次传输中断概率。最后通过仿真验证了该方案的性能。
In this paper, we consider power allocation in multiband cognitive radio (CR) networks, where multiple secondary users (SUs) transmit via a common relay and compete for the transmit power of the relay. We employ a hybrid overlay/underlay spectrum sharing scheme, allowing the SU to adapt its way of accessing the licensed spectrum to the status of the primary user (PU). If the PU is detected to be idle at the selected channel, the SU works in an overlay mode; else, it works in spectrum underlay. In addition, an auction-based power-allocation scheme is proposed to solve power competition of multiple SUs. For the SU working in spectrum overlay, the relay allocates the power in proportion to its payment without additional constraints; for the SU in spectrum underlay, its own transmit power and that of the relay are upper bounded for the quality of service (QoS) of the PU. Then, the convergence of the proposed auction algorithm and the outage probability of secondary transmissions is theoretically analyzed. Finally, the performance of the proposed scheme is verified by the simulation results.