Broadband power line carrier communication physical layer signal processing method based on OFDM

Abstract

The invention discloses a broadband power line carrier communication physical layer emission signal processing method based on OFDM. The method includes: receiving data from a link layer, and dividing the data into frame control data and load data; performing channel coding on the frame control data and the load data, and modulating the frame control data and the load data after channel coding to subcarriers; performing inverse Fourier transform on the modulated frame control data and the load data, performing power control, and generating a time domain frame control symbol and a time domain load symbol; and adding a cyclic prefix to the time domain frame control symbol and the time domain load symbol, adding a time domain leading symbol, performing windowing processing, and generating physical layer emission signals. According to the method, the utilization rate of the frequency band is high, the transmission rate is high, and the intersymbol interference resistance and the channel fading resistance are excellent.

Description

technical field [0001] The present invention relates to the technical field of power line carrier communication, specifically, a method for generating a physical layer transmission signal of a PLC (Power Line Communication, broadband power line carrier communication) based on OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), It can be used in power line carrier communication system. Background technique [0002] Power line carrier communication is a wired communication technology that utilizes power wiring to transmit and receive communication signals. Due to the wide distribution of power line networks, using power lines as communication media does not require indoor perforated wiring to rebuild communication networks. It has the advantages of low cost and convenient connection, and has attracted more and more attention in smart grid and broadband access. [0003] The communication channel is the basis of communication. Like wir...

AI Technical Summary

Problems solved by technology

The low-voltage power grid is not designed to transmit high-speed data. The components that make up the power grid are designed to minimize the loss of power transmission and ensure reliable transmission of low-frequency current. Therefore, many problems will be faced when transmitting signals on low-voltage lines, such as : Complex interference noise, small line impedance, strong signal attenuation, etc.

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