基于不完美CSI的低轨卫星通信系统鲁棒资源分配算法  

Robust Resource Allocation Algorithm for Low Orbit Satellite Communication System Based on Imperfect CSI

作　　者：吴翠先 董燚恒 徐勇军[1,2] 张海波 薛青[1] WU Cuixian;DONG Yiheng;XU Yongjun;ZHANG Haibo;XUE Qing(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Zhejiang Provincial Key Laboratory of Information Processing,Communication and Networking,Zhejiang 310058,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]浙江省信息处理与通信网络重点实验室,浙江310058

出　　处：《电子与信息学报》2024年第2期671-679,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62271094,U21A20448);重庆市教委科学技术研究项目(KJZD-K202200601);重庆市自然科学重点基金(CSTB2022NSCQ-LZX0009);浙江省信息处理与通信网络重点实验室开放课题(IPCAN-2302,IPCAN-2303)。

摘　　要：为了解决低轨卫星通信系统因资源受限导致的能量与速率不平衡的问题,同时考虑信道不确定性对实际卫星通信系统性能衰退的影响,该文提出一种基于最大化最小能效的鲁棒资源分配算法。首先,考虑每个用户中断速率约束、功率分配系数约束和最大发射功率约束,基于高斯信道不确定性,构建了联合优化卫星波束成形向量与功率分配因子的鲁棒资源分配模型。所描述的问题是一个含参数摄动的非凸、非确定性多项式难问题,很难直接求解。为此,基于丁克尔巴赫、伯恩斯坦不等式、半正定松弛和交替优化等方法将其转化为等价的凸优化问题,并提出一种基于迭代的混合鲁棒波束成形与功率分配算法。仿真结果表明,该文算法具有较好的能效和较强的鲁棒性。In order to solve the imbalance problem between power consumption and transmission in low orbit satellite communication systems caused by the limited resource,a robust resource allocation algorithm is proposed to maximize the minimum energy efficiency of multiple users by considering the effect of channel uncertainties on the performance degradation of real satellite communication systems.Firstly,a robust resource allocation model with Gaussian channel uncertainties is formulated by jointly optimizing the beamforming vectors and power allocation factors of the multi-beam satellite,meanwhile the outage rate constraint of each user,the power allocation factor constraint and the maximum transmit power constraint are considered simultaneously.The formulated problem is a non-convex and NP-hard with parametric perturbation,which is difficult to solve it directly.To this end,the original problem is converted into a convex one by using Dinkelbach’s method,Bernstein-type inequality,semi-definite relaxation and the alternating optimization technique,and an iteration-based hybrid robust beamforming and power allocation algorithm is proposed.Simulation results verify that the proposed algorithm has good energy efficiency and strong robustness.

关 键 词：低轨卫星通信 波束成形 能效优化 鲁棒性 

分 类 号：TN927.2[电子电信—通信与信息系统]