煤矿井下低压电力线OFDM通信算法研究

Research of OFDM communication algorithm of low-voltage power line in coal mine

针对传统的基于离散傅里叶变换的OFDM算法应用在井下低压电力线上容易产生较大的ISI和ICI而影响信号正常接收的问题,提出了一种基于小波变换的OFDM通信算法。该算法选用Daubechies小波函数作为正交基,采用MATTAL算法进行小波的重构与分解,并得到信道的输出函数。仿真结果表明,基于小波变换的OFDM算法在低压电力线通信中应用具有减少ISI和ICI的作用,提高了通信质量。

In view of problem that traditional OFDM algorithm based on discrete Fourier transform used in underground low-voltage power lines is prone to produce larger ISI and ICI to influence normal receiving of signal,an OFDM communication algorithm based on wavelet transform was proposed.The algorithm selects Daubechies wavelet function as orthogonal wavelet basis,uses MATTAL algorithm to decompose and reconstruct wavelet,and gets channel output functions.The simulation result shows that the OFDM algorithm based on wavelet transform can reduce ISI and ICI in application of low-voltage power line communication,and improve communication quality.