Energy-Efficient Power Control for Cognitive Satellite-Terrestrial Networks With Outdated CSI
Energy-Efficient Power Control for Cognitive Satellite-Terrestrial Networks With Outdated CSI
复制标题
具有过时 CSI 的认知卫星地面网络的节能功率控制
DOI：
10.1109/jsyst.2020.2975025
复制
发表时间：
2021-03-01
影响因子：
4.4
通讯作者：
Zhang, Rui
中科院分区：
文献类型：
--
作者：
Ruan, Yuhan;Jiang, Lijuan;Zhang, Rui
针对卫星通信中能量有限、反馈时延大的特点，提出了一种基于过时信道状态信息（CSI）的认知星地网络能量有效的功率控制方案，其中卫星网络重用地面网络的频谱资源。具体而言，为了保证可靠的通信网络，我们首先制定的功率控制方案作为一个能源效率（EE）的最大化问题受到地面通信和卫星通信速率约束的干扰功率约束。此外，我们解决了非线性凹优化问题，并推导出平均发射功率的理论性能评估。仿真结果揭示了各种关键参数对卫星通信的影响。
Taking account of the limited energy and large feedback delay in satellite communications, in this article, we propose an energy-efficient power control scheme for cognitive satellite-terrestrial networks with outdated channel state information (CSI), where satellite network reuses the spectrum resources of terrestrial networks. Specifically, to guarantee reliable communications for both networks, we first formulate the power control scheme as an energy efficiency (EE) maximization problem subjected to interference power constraints imposed by terrestrial communications and rate constraints of satellite communications. Moreover, we solve the nonlinear concave optimization problem and derive the average transmit power for theoretical performance evaluation. Simulation results reveal the impacts of various key parameters on satellite communications.