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作 者:郑斌 曾令昕 黄辉 王晓洪 丁昌峰 王金元[2] ZHENG Bin;ZENG Lingxin;HUANG Hui;WANG Xiaohong;DING Changfeng;WANG Jinyuan(China Satellite Network Exploration Co.,Ltd.,Chongqing 401123,China;School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
机构地区:[1]中国星网网络应用有限公司,重庆401123 [2]南京邮电大学通信与信息工程学院,南京210003
出 处:《电子与信息学报》2025年第3期623-632,共10页Journal of Electronics & Information Technology
基 金:重庆市自然科学联合基金项目(CSTB2023NSCQ-LZX0121);南京邮电大学引进人才科研启动基金项目(自然科学)(NY223024);东南大学移动通信全国重点实验室开放研究基金资助课题(2024D11);交通物联网技术湖北省重点实验室开放基金。
摘 要:面向密集低轨道卫星网络辅助的星地无线通信系统,该文提出一种基于非完美信道状态信息的多低轨卫星鲁棒波束赋形方法来改善频谱效率。具体地,在多低轨卫星全频复用场景下,提出了一个多卫星下行通信系统和速率最大化问题,并联合考虑卫星发射功率、卫星与用户关联关系,以及馈线链路容量约束。为了求解该优化问题,原优化问题被分解成卫星-用户关联和卫星传输波束赋形两个子问题,然后使用加权最小均方误差方法和连续凸近似方法对问题进行求解。仿真结果验证了即使在非理想信道条件下,该文所提出的多星频率复用和鲁棒波束赋形设计方法能有效提高系统吞吐量。A robust beamforming method based on imperfect Channel State Information(CSI)is proposed for dense Low-Earth Orbit(LEO)satellite network-assisted terrestrial wireless communication systems to enhance spectral efficiency.Specifically,in scenarios where multiple LEO satellites use full frequency reuse,a multi-LEO satellite downlink sum rate maximization problem is formulated,considering constraints on satellite transmit power,satellite-User Terminal(UT)association,and satellite feeder link capacity.To solve the optimization problem,it is decomposed into two subproblems:satellite-UT association and satellite transmit beamforming.Weighted minimum mean-squared error and successive convex approximation methods are then employed to address the non-convex challenges.Simulation results confirm that the proposed multi-satellite full frequency reuse scheme and robust beamforming design effectively improve system throughput,even under non-ideal channel conditions.Objective As the LEO satellite constellation becomes denser,spectrum resources will become scarcer,and co-channel interference among satellites will intensify.Therefore,transmission methods with higher spectrum efficiency are needed.To mitigate the effects of severe satellite-terrestrial wireless channels and enhance system throughput,multi-beam beamforming and phased-array antennas are employed in LEO satellites to achieve higher antenna gain.However,most existing studies assume perfect knowledge of CSI,which is often impractical.Therefore,considering the complex satellite-terrestrial channel conditions and channel estimation errors,a robust beamforming method is preferable.Under dense satellite constellations,the increasing number of satellites and the presence of inter-satellite co-channel interference make the design of robust transmission methods for multi-LEO satellite networks essential.Thus,this paper aims to investigate the design of an efficient robust beamforming method for dense LEO satellite networks under given channel uncertainty.Methods To enable fre
关 键 词:密集LEO卫星 MIMO 鲁棒波束赋形 频率复用
分 类 号:TN927.2[电子电信—通信与信息系统]
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