可见光通信中一种基于分段误差函数的变步长LMS算法

发布时间：2018-03-02 06:17

本文关键词： 可见光通信均衡 LMS算法变步长分段误差函数　出处：《信号处理》2017年04期 　论文类型：期刊论文

【摘要】：均衡技术是一种对抗信道衰落、提高无线电通信质量的有效手段。在可见光通信中,由于传输媒介和实现方式与无线电通信存在差异,传统的均衡算法不一定适用。本文针对可见光信道的特点,总结现有最小均方误差(LMS)均衡算法,提出了一种适用于可见光通信的变步长LMS算法。该算法中,步长公式采用误差函数替代Sigmoid函数和箕舌线函数;此外,为了降低计算复杂度和硬件实现难度,它利用初等函数分段近似替代误差函数。仿真结果表明,在可见光信道条件下,改进后的算法与现有的几种算法相比,可以保证在较低的稳态误差下有更快的收敛速度,且具有较好的跟踪性,因而更适用于可见光通信系统。
[Abstract]:Equalization is an effective means to counter channel fading and improve the quality of radio communication. In visible light communication, due to the difference between transmission medium and radio communication, The traditional equalization algorithm is not necessarily applicable. In this paper, according to the characteristics of the visible light channel, we summarize the existing minimum mean square error (MSS) equalization algorithms, and propose a variable step size LMS algorithm which is suitable for the visible light communication. The error function is used to replace the Sigmoid function and the tongue line function. In addition, in order to reduce the computational complexity and the difficulty of hardware implementation, the elementary function is used to approximate the error function. The simulation results show that in the visible light channel, the error function is replaced by the error function. Compared with the existing algorithms, the improved algorithm can guarantee faster convergence speed and better tracking performance under lower steady-state error, so it is more suitable for visible light communication systems.
【作者单位】：华侨大学厦门市移动多媒体通信重点实验室;
【基金】：国家自然科学基金(61201264,61362018,61401165) 国家留学基金委(201508350023) 江苏省博士后基金(1402041B) 湖南省教育厅项目(16A174) 华侨大学引进高层次人才启动基金(13BS101)资助课题
【分类号】：TN929.1

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