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基于LWT的可见光OFDM-IM系统研究

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针对索引调制正交频分复用(OFDM-IM)技术峰均比过高，对相位噪声和载波频偏敏感，系统复杂度高等问题，提出基于小波提升变换(LWT)的可见光OFDM-IM系统。首先选择正交小波基作为子载波，通过对信号的分裂、预测和更新，将信号分为高频信号和低频信号，再结合可见光信道构成LWT-OFDM-IM系统，最后通过理论分析和蒙特卡罗方法对系统的可靠性、峰均比特性和最佳小波分解层数进行了仿真验证，结果表明:当子载波N=256，子块中子载波数量L=4，激活子载波数量k=2，系统误码率为10-4时，LWT-OFDM-IM比FFT-OFDM-IM改善约8 dB，相较于DWT-OFDM-IM提高约4 dB。当系统互补累计分布函数(CCDF)为10-1数量级时，LWT-OFDM-IM的峰均比较FFT-OFDM-IM改善约2。3 dB。随着小波层数的递增，系统的误码性能越好，当小波层数为3层时，大约在10 dB附近，误码率可到10-5量级。
Research on visible light OFDM-IM system based on LWT
Aiming at the problems of index modulation orthogonal frequency-division multiplexing technology with high peak-to-average ratio,sensitivity to phase noise and carrier frequency,and high system complexity,this paper proposes a visible OFDM-IM system based on wavelet boost transform.Firstly,the orthogonal wavelet group is selected as the subcarrier,and the signal is divided into high-frequency signal and low-frequency signal through the splitting,prediction and update of the signal,and then combined with the visible light channel to form the LWT-OFDM-IM sys-tem,and finally the reliability,peak-to-average ratio characteristics and optimal wavelet decomposition layer of the system are simulated and verified by theoretical analysis and Monte Carlo method,and the results show that when the subcarrier N=256,the number of neutron carriers in the subblock L=4,the number of activated subcarriers k=2,and the system bit error rate is 10-4.LWT-OFDM-IM is about 8 dB better than FFT-OFDM-IM and about 4 dB high-er than DWT-OFDM-IM.When the system complementary cumulative distribution function is 10-1 orders of magni-tude,the peak-average improvement of LWT-OFDM-IM is about 2.3 dB compared with FFT-OFDM-IM.As the number of wavelet layers increases,the better the bit-error performance of the system,when the wavelet layer is 3 lay-ers,it is about 10 dB,and the bit error rate can reach the order of 10-5.

visible light communicationorthogonal frequency division multiplexinglifting wavelet transformin-dex modulationpeak-to-average

王宁、赵黎、张峰、孟祥艳

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西安工业大学电子信息工程学院,西安 710021

可见光通信 正交频分复用 提升小波变换 索引调制 峰均比

国家自然科学基金项目陕西省科技厅一般项目-工业领域西安市科技计划项目西安工业大学优秀学位论文培育基金

120042922022GY-0722020KJRC0040YS202211

2024

10.14016/j.cnki.jgzz.2024.1.148

激光杂志
重庆市光学机械研究所

激光杂志

CSTPCD北大核心
影响因子：0.74
ISSN：0253-2743
年,卷(期)：2024.45(1)
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