基于和速率最大化的以用户为中心可见光通信最优预编码设计

徐文艳; 杨森; 段田东

doi:doi:10.3788/ope.20202803.0686

光学精密工程, 2020, 28 (3): 686, 网络出版: 2020-05-12

基于和速率最大化的以用户为中心可见光通信最优预编码设计

Sum-rate maximization of user-centric visible light communication cells with zero forcing precoding

论文大纲

徐文艳 ^*杨森段田东

作者单位

战略支援部队信息工程大学, 河南郑州 450002

可见光通信以用户为中心预编码迫零凸优化 visible light communication user-centric precoding Zero Forcing(ZF) convex optimization

摘要

本文针对可见光通信系统中以用户为中心协作联合传输的预编码技术进行了深入研究。首先, 利用信息论工具, 在以用户为中心的协作策略中推导出和速率表达式。然后, 考虑发光二极管的光功率限制以及光信号非负性等约束条件, 得到最大和速率优化问题, 在此基础上, 将最大和速率最优波束形成设计问题转化为凸优化问题, 并利用CVX标准优化包对其进行有效求解。最后, 将所提出的以用户为中心的传输方法与传统的以网络为中心的传输方法及非协作传输方式进行比较。仿真结果显示, 采用迫零预编码(Zero Forcing, ZF)技术在系统总和速率方面有较大提高, 约提高2 nats/s/Hz。以用户为中心的协作方式相比较于非协作、以小区为中心传统协作方式, 系统性能更优。

Abstract

In this paper, the Zero-Forcing (ZF) precoding optimization of a visible light communication (VLC) system was studied in detail. We first derive sum-rate expression via information theory tool. Then, by considering that the optical power restriction of light-emitting diodes and VLC signals was inherently non-negative, the rate maximization problem was given in the form of mathematical optimization. Based on the derived bounds, optimal beamformer designs for max-min fairness sum-rate and maximum sum-rate problems were formulated as convex optimization problems, which then can be efficiently solved using standard optimization packages. Comparison with existing network-centric cooperative and noncooperative schemes in a VLC system show that the user-centric approach performs better, and ZF precoding can effectively improve the sum-rate of the system by approximately 2 nats/s/Hz, as is validated by simulations.

参考文献

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徐文艳, 杨森, 段田东. 基于和速率最大化的以用户为中心可见光通信最优预编码设计[J]. 光学精密工程, 2020, 28(3): 686. XU Wen-yan, YANG Sen, DUAN Tian-dong. Sum-rate maximization of user-centric visible light communication cells with zero forcing precoding[J]. Optics and Precision Engineering, 2020, 28(3): 686.

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