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DIGITAL FRONT-END SYSTEM USED FOR POWER LINE CARRIER COMMUNICATIONS AND IMPLEMENTATION METHOD THEREFOR
DIGITAL FRONT-END SYSTEM USED FOR POWER LINE CARRIER COMMUNICATIONS AND IMPLEMENTATION METHOD THEREFOR
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机译:用于电力线载波通信的数字前端系统及其实现方法
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摘要
The present invention relates to the field of electric power communications for supporting smart power grids, and particularly to a digital front-end system used for power line carrier communications and an implementation method therefor. The digital front-end system comprises a transmitter and a receiver which perform communications in sequence, wherein the transmitter comprises an inverse Fourier transform module, a windowing module I, an interpolation filter, a frequency mixer I and a digital-to-analogue converter which perform communications in sequence, and the receiver comprises an analogue-to-digital converter, a frequency mixer II, a decimation filter, a windowing module II and a Fourier transform module which perform communications in sequence. The implementation method comprises the following steps: (1) inputting a modulation symbol onto the transmitter and then converting same into an analogue signal; and (2) inputting the analogue signal onto the receiver and then converting same into the modulation symbol. The present invention combines a digital front end in the form of an equivalent complex baseband with a method of the Nyquist window, which has the characteristics of supporting frequency band selection, supporting bandwidth configuration, suppressing out-of-band interference, reducing out-of-band energy for sending signals, and suppressing in-band narrowband interference.
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