Energy Efficient Power Control for Cognitive Multibeam-Satellite Terrestrial Networks With Poisson Distributed Users
Energy Efficient Power Control for Cognitive Multibeam-Satellite Terrestrial Networks With Poisson Distributed Users
复制标题
具有泊松分布式用户的认知多波束卫星地面网络的节能功率控制
DOI：
10.1109/tccn.2022.3161945
复制
发表时间：
2022-06-01
影响因子：
8.6
通讯作者：
Jiang, Lijuan
中科院分区：
文献类型：
--
作者：
Ruan, Yuhan;Li, Yongzhao;Jiang, Lijuan
认知卫星地面网络（CSTNs）在缓解下一代无线通信频谱紧张方面具有巨大的潜力，近年来引起了人们的广泛关注。为了实现卫星和地面网络之间的有效频谱共享，在本文中，我们提出了一种能量有效的功率控制方案的CSTN，其中多波束卫星网络作为辅助系统和蜂窝网络作为主系统。特别地，卫星用户和主基站在空间上是泊松分布的，并且假设卫星干扰链路的信道状态信息（CSI）是过时的。本文首先用概率随机几何的方法分析了地面聚合体干扰的统计特性。在此基础上，为了保证两个网络的可靠通信，我们制定的功率控制方案作为一个能量效率最大化的问题受到干扰功率约束的地面通信和中断的卫星通信的限制。进一步，利用丁克尔巴赫和拉格朗日对偶方法，求解非线性凹优化问题，推导出发射功率的最优解。仿真结果验证了理论分析的正确性，揭示了两种网络性能之间的折衷关系，给出了聚合干扰对卫星网络性能的影响，并从干扰违反概率的角度展示了考虑过时CSI与理想CSI假设的性能优势。
With great potential to alleviate spectrum scarcity in the next generation wireless communication, cognitive satellite terrestrial networks (CSTNs) have attracted considerable attention recently. To realize efficient spectrum sharing between satellite and terrestrial networks, in this paper, we propose an energy efficient power control scheme for CSTNs, where a multibeam satellite network acts as the secondary system and the cellular network acts as the primary system. Especially, satellite users and primary base stations are spatially Poisson distributed and the channel state information (CSI) of satellite interference link is assumed to be outdated. We firstly analyze the statistical characteristic of the terrestrial aggregate interference with probabilistic stochastic geometry. On this basis, to guarantee reliable communications for both networks, we formulate the power control scheme as an energy efficiency maximization problem subjected to interference power constraints imposed by terrestrial communications and outage constraints of satellite communications. Further, by employing the Dinkelbach and Lagrange duality method, we solve the nonlinear concave optimization problem and derive the optimal solution of the transmit power. Finally, simulation results demonstrate the validity of the theoretical results, reveal the trade-off between the performance of two networks, present the impacts of aggregate interference on the performance of satellite networks, and show the performance superiority of considering outdated CSI compared with perfect CSI assumption in terms of interference violation probability.