基于多臂赌博机的卫星通信系统子载波分配算法  

A multi⁃armed bandit based subcarrier allocation scheme in satellite communication

作　　者：刘智鹏 赵柏 林敏[1] 孙士勇[2] 欧阳键 LIU Zhipeng;ZHAO Bai;LIN Min;SUN Shiyong;OUYANG Jian(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《南京邮电大学学报（自然科学版）》2023年第3期35-43,共9页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：重点国际合作项目(61720106003);南京邮电大学引进人才科研启动基金(NY220111);基础加强计划技术领域基金(2019⁃JCJQ⁃JJ⁃226);江苏省研究生科研与实践创新计划(KYCX20_0814)资助项目。

摘　　要：为了提升卫星通信系统的频谱效率,在卫星系统采用正交频分多址(Orthogonal Frequency Division Multiple Access,OFDMA)传输技术的情况下,提出了一种基于多臂赌博机(Multi⁃Armed Bandit,MAB)的子载波分配算法。首先,建立基于OFDMA的卫星系统上行链路多用户传输模型。然后建立以用户总速率最大化为目标,以用户最大发射功率和用户服务质量为约束条件的资源分配问题。接着,利用MAB能在环境信息部分未知时在线学习摇臂选择策略的特性来求解该优化问题,并获得子载波分配方案。仿真结果表明,所提算法能实现系统子载波的自适应分配,同时用户总速率与贪婪算法在已知信道状态信息下获得的用户总速率几乎相同。In order to improve the spectral efficiency of satellite communication systems,we propose a multi⁃armed bandit(MAB)based subcarrier allocation scheme for a satellite system with the orthogonal frequency division multiple access(OFDMA)transmission technology.Firstly,we establish the multi⁃user transmission model based on the uplink OFDMA communication in the considered satellite system.Secondly,we formulate an optimization problem to maximize the system sum rate under the constraints of the quality of service requirements and the transmission power budget of the ground users.To tackle this mathematically intractable problem,we exploit MAB and appropriate its expertise of online arm selection optimization without knowing the environmental information to solve the formulated optimization problem and achieve the subcarrier allocation strategy.Finally,the simulation results show that the proposed MAB⁃based scheme can realize the adaptive allocation of system subcarrier resources,and achieve similar sum rate performance with that of the traditional greedy scheme with available channel state information.

关 键 词：卫星通信 OFDMA 子载波分配 多臂赌博机 

分 类 号：TN927[电子电信—通信与信息系统]