面向低轨多星协作的非正交传输资源分配方法  

Resource Allocation of Non-orthogonal Transmission Towards LEO Satellite Cooperative Communication

作　　者：赵梅惠 叶能[2] 金怡丰 吴启迪 马天蔚 黎卓芃 金野 ZHAO Meihui;YE Neng;JIN Yifeng;WU Qidi;MA Tianwei;LI Zhuopeng;JIN Ye(School of Electronics,Peking University,Beijing 100871,China;School of Cyberspace Science and Technology,Beijing Institute of Technology,Beijing 100081,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京大学电子学院,北京100871 [2]北京理工大学网络空间安全学院,北京100081 [3]北京理工大学信息与电子学院,北京100081

出　　处：《无线电通信技术》2022年第5期773-781,共9页Radio Communications Technology

基　　金：国家自然科学基金青年科学基金(62101048)。

摘　　要：近年来,低轨卫星星座的密集化使得通过低轨卫星之间的协作通信来提高网络吞吐量的能力得到增强。然而,卫星网络的大空间尺度特性使得传输链路间的时间异步性不容忽视。因此,对在低轨卫星协作通信场景中利用异步非正交传输来提高公平感知率展开研究。首先,推导了该场景下异步容量的表达式用于优化问题的建模,该问题联合考虑了卫星终端连接关系和卫星发射功率分配的优化。为了解决该混合整数非线性问题,提出了一种基于偏好列表的联合资源分配算法,该算法将原优化问题分解为卫星终端连接关系子问题和卫星发射功率分配子问题,在给定偏好列表的情况下分别通过Gale-Shapley算法和Dinkelbach算法求解,然后根据子问题每轮迭代结果更新偏好列表求得最终解。仿真结果验证了采用异步非正交传输在低轨卫星通信网络中的优越性和提出算法在最大最小公平性方面的有效性。The ever-increasing densification of the low-Earth orbit satellite constellation enhance it to boost the throughput via cooperative communication among satellites.However,the large spatial scale characteristics of satellite networks makes the time asynchrony non-negligible.This paper exploits the asynchronous non-orthogonal transmission for LEO satellite cooperation scenario to improve the fairness-aware rate.The asynchronous capacity is derived and utilized in the formulation of the optimization problem,which jointly considers the satellite-to-terminal association and transmit power allocation.To solve this mixed-integer nonlinear problem,a preference-list-based algorithm is proposed,which decompose the original problem into satellite-to-terminal association sub-problem and power allocation sub-problem.The two sub-problems are solved by Gale-Shapley algorithm based and Dinkelbach algorithm based on the given preference lists,respectively.Then the preference lists are updated according to the results of each iteration of the sub-problems to obtain the final solution.Simulation results verify the superiority of asynchronous non-orthogonal transmission and effectiveness of proposed algorithm in max-min fairness.

关 键 词：低轨卫星协作通信网络 非正交多址接入 异步传输 最大最小公平 资源分配 

分 类 号：TN919.23[电子电信—通信与信息系统]