激光与光电子学进展, 2020, 57 (1): 010601, 网络出版: 2020-01-03
以用户为中心的可见光通信协作传输中训练资源分配算法 下载: 959次
Training Resource Allocation for User-Centric Visible Light Communication Cooperation Transmission
光通信 可见光通信 导频污染 训练资源分配 以用户为中心 协作传输 optical communications visible light communication pilot contamination training resource allocation user-centric design cooperation transmission
摘要
以用户为中心的可见光通信协作传输是近年来出现的新架构,这导致虚拟小区之间出现重叠。为避免导频污染问题,每个虚拟小区中的光接入点(AP)或者虚拟小区中选择相同AP的用户发送的训练序列应该是正交的。针对可见光通信中以用户为中心的协作网络,研究训练资源的正交分配问题,提出了一种新的导频分配算法,联合导频分配和用户选择问题,以期最大限度地增加虚拟小区内可被接入的用户数。分析和仿真结果表明,该导频分配方案可以有效改善导频污染问题,提高训练资源利用率,并且相比已有的导频分配方案,性能有所改进。
Abstract
User-centric applications through visible light communication cooperative transmission constitute an architecture that has emerged in recent years. The resulting user-dependent cooperative clusters are observed to inevitably overlap. The training signals transmitted from the access points (APs) in each cluster or from the users who select identical APs in their clusters should be mutually orthogonal to avoid pilot contamination. Herein, we study the orthogonal training resource allocation problem for user-centric cooperative networks. Further, we formulate a joint pilot allocation and the user equipment (UE) selection problem to maximize the number of admitted UE with a fixed number of pilots. Finally, the analysis and numerical results denote a remarkable improvement when compared with the existing scheme and denote that the proposed method can effectively avoid pilot contamination and improve the utilization of training resources.
徐文艳, 于宏毅, 杨森. 以用户为中心的可见光通信协作传输中训练资源分配算法[J]. 激光与光电子学进展, 2020, 57(1): 010601. Wenyan Xu, Hongyi Yu, Sen Yang. Training Resource Allocation for User-Centric Visible Light Communication Cooperation Transmission[J]. Laser & Optoelectronics Progress, 2020, 57(1): 010601.