NOMA-VLC系统中基于信道容量的功率分配方法  

Power Allocation Method Based on Channel Capacity in NOMA-VLC Systems

作　　者：何滨江 张峰[1] 赵黎[1] 樊欣 HE Binjiang;ZHANG Feng;ZHAO Li;FAN Xin(School of Electronic Information Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学电子信息工程学院,陕西西安710021

出　　处：《佳木斯大学学报(自然科学版)》2025年第1期20-24,共5页Journal of Jiamusi University:Natural Science Edition

基　　金：陕西省科技厅一般项目-工业领域项目(2021GY-107)。

摘　　要：针对NOMA-VLC系统中固定功率分配(Fixed Power Allocation,FPA)方法存在用户间干扰严重问题导致通信可靠性差,迭代注水功率分配(Iterative Water-filling Power Allocation,IWPA)方法存在难以保证用户公平性问题,提出基于信道容量的功率分配方法,首先对多用户场景下的系统模型进行分析;在此基础上,基于迭代优化的方式进行发送端用户功率分配,达到信道容量的目标函数,保证系统可靠性和用户公平性;最后建立实验平台,通过蒙特卡洛实验对系统性能进行分析,实验结果表明:在三种不同的调制格式下,文中方法相较于FPA方法系统平均获得10 dB以上性能增益,相较于IWPA方法系统保证两用户可靠通信;随着前端调制阶次的提高,文中方法有效降低SNR需求,减小用户间的性能差异,使用户公平性得到良好保证。In response to the severe user interference problem in Fixed Power Allocation(FPA)methods,which leads to poor communication reliability in NOMA-VLC systems,and the difficulty in ensuring user fairness in Iterative Water-filling Power Allocation(IWPA)methods,this paper proposes a channel capacity-based power allocation method.Firstly,the system model in multi-user scenarios are analyzed.Based on this,the user power allocation at the transmitting end is carried out based on iterative optimization to achieve the channel capacity objective function,ensuring both system reliability and user fairness.An experimental platform is established,and system performance is analyzed through Monte Carlo experiments.The experimental results demonstrate that,under three different modulation formats,the proposed method achieves an average performance gain of over 10 dB compared to the FPA method.Additionally,it ensures reliable communication for both users when compared to the IWPA method.As the modulation order of the front-end increases,the proposed method effectively reduces the SNR requirement,minimizes the performance disparity between users,and ensures a high level of user fairness.

关 键 词：非正交多址可见光通信 功率分配算法 信道容量 用户公平性 

分 类 号：TN929.1[电子电信—通信与信息系统]