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单边带电力线载波机一般采用频移键控调制方式实现远动信号的传输,在话音与远动复用时,远动信号传输速率不超过600bit/s,而在远动专用时,远动信号传输速率不超过1200bit/s。为了提高远动信号的传输速率,提出了一种基于多载波调制原理实现远动信号传输的方法。该方法对输入数据进行串/并变换、数据编码,接着插入帧同步序列、信号映射,然后进行离散傅里叶反变换从而实现多载波调制;对多载波输入信号进行抽样、离散傅里叶变换、信号逆映射,然后删除帧同步序列、解码、并/串变换从而恢复出原始数据。
Single-sideband power line carrier generally adopts frequency shift keying modulation to realize the transmission of far-end signal. When the voice and the far-distance multiplexing are used, the transmission rate of the far-end signal does not exceed 600 bit / s, while in the case of telecontrol, Signal transmission rate does not exceed 1200bit / s. In order to improve the transmission rate of remote signal, a method of remote signal transmission based on multi-carrier modulation principle is proposed. The method performs serial / parallel conversion on input data, encodes the data, then inserts a frame synchronization sequence and a signal mapping, and then carries out inverse discrete Fourier transform to realize multi-carrier modulation. The multi-carrier input signal is sampled and discrete Fourier transform , Signal inverse mapping, and then delete the frame synchronization sequence, decoding, and / serial conversion to recover the original data.