DIGITAL FRONT-END SYSTEM USED FOR POWER LINE CARRIER COMMUNICATIONS AND IMPLEMENTATION METHOD THEREFOR

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.