English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The signal noise and attenuation in channels severely affect the communication quality in power distribution network. Orthogonal Frequency Division Multiplexing(OFDM) has an excellent antijamming capability and a high rate of channel utilization and is widely adopted in power line communication. In this paper, an OFDM system applied in power line communication is established. Then several typical channel models under Matlab are chosen to simulate the signal transmission in 10kV power line communication and analyze the channel characteristics. INTRODUCTION Power line communication is a special kind of communication mode which uses the power line as the signal transmission medium. In recent years, a growing recognition to power line communication is given with the increase of social demand. However, power line, originally designed for electric power distribution, is not an ideal signal transmission medium. Also, it is susceptible to the interference in signal transmission. OFDM is a modulation technique which enables high transmission rate, the effective utilization rate of spectrum and the ability of strong resistance to sudden interference. In addition, it ensures stable and reliable signal transmission with channel coding, FFT and window technique. The paper selects typical channel models(Multipath model, AR model and FIR model) to build time domain model of 10kV power line communication based on OFDM. Finally, the paper analyzes the transmission characteristics in the communication under different models and has practical significance. ESTABLISHMENT OF OFDM Basic principles The basic idea of OFDM is that a given channel is divided into many orthogonal sub-channels on which the parallel subcarrier is modulated. In this way, although the overall channels with frequency selection characteristic are uneven, each sub-channel is a narrow-band transmission one and the signal bandwidth is less than corresponding channel bandwidth. Thus the interference between the signal waveform is greatly eliminated . Since OFDM allows the subcarrier frequency spectrum aliasing, the data can be separated from the mixture of subcarrier signal if the subcarrier is orthogonal to each other and its spectrum efficiency is greatly increased. Building process Modulation Subcarrier mapping S/P Subcarrier De-mapping Demodulation FFT S/P Deleting cp A/D Channel D/A Inserting cp P/S IFFT

The time-domain model of 10kV power Line communication based on OFDM