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.
作者
樊欣
张峰
赵黎
FAN Xin;ZHANG Feng;ZHAO Li(School of Electronic Information Engineering,Xi'an Technological University,Xi'an 710021,China)
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。
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
optical communications
non-orthogonal multiple access
lifting wavelet transform
reliability
user fairness
