室内VLC-NOMA的自适应用户分组和功率分配  

Adaptive User Grouping and Power Allocation for Indoor VLC⁃NOMA

作　　者：刘焕淋[1] 宋文杰 陈勇[2] 张彤 陈浩楠[2] 谢裕欣 邓棣 Liu Huanlin;Song Wenjie;Chen Yong;Zhang Tong;Chen Haonan;Xie Yuxin;Deng Di(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Key Laboratory of Industrial Internet of Things&Network Control,Ministry of Education,Chongqing University of Posts and Telecommunications,Chongqing 400065,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]重庆邮电大学工业物联网与网络化控制教育部重点实验室,重庆400065

出　　处：《中国激光》2024年第14期201-209,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(51977021);重庆市自然科学基金(CSTB2023NSCQ-MSX0734)。

摘　　要：为提高大规模设备接入基于非正交多址的室内可见光通信(VLC-NOMA)的平均意见分(MOS)和用户公平性,本文设计自适应用户分组和功率分配的联合优化(JOAUGPA)方法。在JOAUGPA中,提出基于层次凝聚聚类的自适应用户NOMA分组方法;设计一种NOMA组的功率自适应调整方法,在满足用户的最小速率和MOS需求情况下提高系统的MOS值和用户公平性。仿真结果表明,所提方法能提高MOS值和用户公平性,当用户数为12时,相比随机用户分组(RUG)方法和固定功率分配(FPA)方法,所提JOAUGPA方法的MOS和用户公平性分别提高了6.88%和6.14%。Objective With the development of 5G applications, the demand for high-quality services has increased rapidly. The mean opinion score(MOS) and user fairness have become important performance indicators for measuring the quality of 5G applications. Orthogonal multiple access-based visible-light communication(VLC-NOMA) can provide high capacity and speed to satisfy the requirements of 5G applications. However, according to Shannon's formula, whether the user's achievable rate can satisfy its minimum and recommendation rate requirements is an important factor affecting the MOS value in VLC-NOMA. Therefore, developing an effective resource allocation method is an effective way to improve the MOS value and user fairness of indoor VLC-NOMA networks.Methods A joint optimization method for adaptive user grouping and power allocation(JOAUGPA) is proposed to improve the MOS and user fairness of large-scale equipment access in VLC-NOMA. In JOAUGPA, adaptive user grouping based on hierarchical agglomerative clustering(HAC) is proposed to group users into NOMA groups, which combines NOMAs that satisfy the criteria for hierarchical clustering and NOMA grouping to increase the MOS value of the system. In addition, a power-adaptive adjustment(PAA) method is designed to improve the system MOS value and user fairness while satisfying the minimum rate and MOS requirements of users. The proposed PAA can adaptively allocate the remaining power of the NOMA group to different users based on changes in the MOS value of the NOMA group. Its objective is to maximize the MOS value of the NOMA group.Results and Discussions By simulating a room with 5 m×5 m×3 m with one light emitting diode(LED) on the ceiling as a VLC AP and randomly distributing multiple users at a height of 0.85 m from the ground, the Monte Carlo method is used to verify the performance of proposed sub algorithms HAC and PAA in JOAUGPA algorithm in a given simulation parameter scenario(Table 1and Table 2). The comparison methods for HAC include adaptive user grouping(AUG

关 键 词：室内可见光通信 非正交多址接入 层次凝聚聚类 功率调整 平均意见分 

分 类 号：TN929.1[电子电信—通信与信息系统]