| 摘要: |
| 为了提高G3-PLC(G3-Power Line Communication)在复杂信道环境下通信的可靠性，提出了基于双正交小波变换的正交频分复用（Discrete Wavelet Transform-Orthogonal Frequency Division Multiplexing,DWT-OFDM）。通过双正交小波变换减小复杂信道环境下G3-PLC通信系统中OFDM载波间干扰，并通过合理减少循环前缀，优化传输效率，降低峰均比。在DWT-OFDM的G3-PLC系统中，通过不同小波基性能分析与对比，利用bior6.8双正交小波基进行系统性能优化。将DWT-OFDM的G3-PLC系统在实际电力线噪声库环境下进行实验分析，仿真结果表明，在平均误码率为10-3量级时，性能有5 dB左右提升，通信效率由40%提高至54%；结合限幅法，峰均比由11 dB降低至8 dB，通信性能极大优于基于FFT-OFDM的G3-PLC系统。 |
| 关键词: 电力线通信 双正交小波变换 正交频分复用 性能优化 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目(61271362)；陕西省科技厅一般项目-工业领域（2018GY-188） |
|
| Application of Biorthogonal Wavelet Transform in Performance Optimization of G3-PLC System |
| LIU Yan,ZHANG Feng,ZHAO Li,SHEN Bo |
| (1.School of Electronic Information Engineering,Xi′an Technological University,Xi′an 710021,China;2.Xi′an Institute of Mechanical and Information Technology,Xi′an 710065,China) |
| Abstract: |
| In order to improve the communication reliability of G3-power line communication(G3-PLC) in complex channel environment,biorthogonal wavelet transform based orthogonal frequency division multiplexing(OFDM) is proposed.Biorthogonal wavelet transform is adopted to reduce the intercarrier interference of OFDM in G3-PLC system under complex channel environment,and the transmission efficiency is optimized and the peak-to-average power ratio(PAPR) is reduced by reasonably reducing the cyclic prefix.In the G3-PLC system of DWT-OFDM,bior6.8 biorthogonal wavelet base is used to optimize the system performance through performance analysis and comparison of different wavelet bases.Experimental analysis is carried out on the G3-PLC system of DWT-OFDM under the actual power line noise library environment.The simulation results show that when the average bit error rate is 10-3 orders of magnitude,the performance is improved by about 5 dB,the communication efficiency is increased from 40% to 54%;when it is combined with the amplitude limiting method,the PAPR is reduced from 11 dB to 8 dB,and the communication performance is greatly superior to that of the G3-PLC system based on FFT-OFDM. |
| Key words: power line communication biorthogonal wavelet transform OFDM performance optimization |
