基于LWT-OFDM的NOMA-VLC系统  

NOMA-VLC system based on LWT-OFDM

作　　者：樊欣 张峰[1] 赵黎[1] FAN Xin;ZHANG Feng;ZHAO Li(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,西安710021

出　　处：《光通信技术》2023年第6期6-10,共5页Optical Communication Technology

基　　金：国家自然科学基金(12004292)资助;陕西省科技厅一般项目-工业领域(2022GY-072)资助;西安市科技计划项目(2020KJRC0040)资助。

摘　　要：针对基于傅里叶变换光正交频分复用(FFT-OFDM)的非正交多址可见光通信(NOMA-VLC)系统存在可靠性低、用户公平性差等问题,提出将提升小波变换(LWT)作为载波调制方式,建立基于LWT-OFDM的NOMA-VLC系统,介绍了系统中的信号处理过程,构建了5 m×5 m×3 m的室内空间实验环境。实验结果表明:与基于FFT-OFDM的NOMA-VLC系统相比,随着正交幅度调制方式的阶次由4增大到64,所提系统的平均误码率达到阀值3.8×10^(-3)时,所需的信噪比(SNR)值较低,至少低4.4 dB;用户性能差异变化不明显甚至不变。Aiming at the problems of low reliability and poor user fairness in non orthogonal multiple access visible light communication(NOMA-VLC)system based on Fourier transform optical orthogonal frequency division multiplexing(FFT-OFDM),a carrier modulation method called lifting wavelet transform(LWT)is proposed to establish a NOMA-VLC system based on LWT-OFDM.The signal processing process in the system is introduced,and an indoor space experiment environment of 5 m×5 m×3 m is constructed.The experimental results show that compared with the NOMA-VLC system based on FFT-OFDM,when the order of orthogonal amplitude modulation increases from 4 to 64,the required signal to noise ratio(SNR)value is lower,at least 4.4 dB lower,when the average bit error rate of the proposed system reaches the threshold of 3.8×10^(-3).User performance differences do not change significantly or even remain unchanged.

关 键 词：光通信 非正交多址 提升小波变换 可靠性 用户公平性 

分 类 号：TN929.1[电子电信—通信与信息系统]