Noise suppression transmission method for medium voltage power line ofdm communication system

Abstract

The invention discloses a noise suppression transmission method of a middle-voltage power line OFDM communication system. The method comprises the steps of acquiring a power line channel characteristic parameter of a power distribution network terminal, calculating subcarrier bit capacity, constructing a continuous subcarrier group according to a principle of minimizing the number of distributionnetwork terminal transmission bits and the number of subcarriers, designing a noise suppression bandpass filter through using the continuous subcarrier group as a transmission band, and realizing noise suppression distribution network terminal data transmission through a subcarrier bandpass filtering operation. The noise suppression transmission method aims at a noise suppression problem in middle-voltage power line OFDM communication. Through selecting the continuous subcarrier group for replacing a plurality of single subcarriers for transmitting data, influence of noise in an adjacent low-SNR subcarrier of the single subcarrier to data transmission is reduced. Furthermore through designing the continuous subcarrier group carrying service data and the bandpass filter, suppression to thenoise of the middle-voltage power line communication system is realized, and furthermore transmission efficiency of the power line communication system can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of medium-voltage power line communication, and in particular relates to a noise suppression transmission method of a medium-voltage power line OFDM communication system. Background technique [0002] Medium-voltage power line communication (Power Line Communication, PLC) technology uses 10kV power line as the transmission medium for communication, and has the characteristics of convenient installation and flexible deployment. Orthogonal Frequency Division Multiplexing (OFDM) technology is a modulation technology suitable for medium-voltage power line communication. It realizes effective data transmission through frequency-domain subcarrier channel division and data bit loading. Considering that the Signal To Noise Ratio (SNR) of the subcarrier channel in the frequency domain is an important factor affecting the transmission quality of OFDM communication, noise suppression is one of the key technical prerequ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the present invention aims at the noise suppression problem of medium voltage power line OFDM communication, and provides a kind of noise suppression transmission method of medium voltage power line OFDM communication system, which replaces multiple single subcarriers by selecting continuous subcarrier groups Data transmission reduces the influence of single sub-carriers on data transmission by noise in adjacent low-SNR sub-carriers, and through continuous sub-carrier groups carrying service data and band-pass filter design, the noise suppression of medium-voltage power line communication systems can be achieved, which can effectively Improving Transmission Efficiency of Power Line Communication System

Images