Broadband Analysis and Characterization of Noise for In-door Power-line Communication Channels
Powerline communication(PLC)has emerged as an alternative solution for connectivity at home and offices in recent times 1.Its development for multimedia broadband applications thus requires an extensive knowledge of the major peculiarities which influences communication over this channel.PLC channels are susceptible to noise inherent in power networks,leading to performance degradation.In this work,we have set-up a measurement system designed to capture the noise both in frequency and time domain for real power networks.The main observable components of the indoor PLC noise are: background noise,impulsive noise,and narrowband interferences.The impulsive components of PLC noise are observed to be time variant,random in nature,have high power spectral density(PSD)and lasts for very small time durations.A greater portion of the impulsive noise has cyclostationary behaviour,though with different amplitudes and widths.The repetition rates of these impulses are synchronous with the mains harmonics of 50 Hz and 100 Hz,the supply frequency in South Africa.Others have irregular occurrences and much higher repetition rates; hence they are unpredictable in nature.This noise is referred to as asynchronous impulsive noise 2.These noise terms are key design parameters for modulation schemes in broadband PLC,popularly orthogonal frequency division multiplexing(OFDM),with its conventional receivers assuming additive white Gaussian noise(AWGN)3.The time variability of PLC noise is presented alongside its statistical analysis based on a series of measurements performed on numerous powerline scenarios.The relevance of this time variance is evaluated in actual channels.The significant difference in amplitudes of the impulsive noise is observed and characterized statistically.The PSD for both the background and impulsive noise is presented.Finally,we present the results of the noise PSD captured with a parametric model and compare our results with findings from other parts of the world.
M.Mosalaosi Thomas J.O.Afullo
Department of Electrical,Electronic and Computer Engineering University of KwaZulu-Natal,Private Bag X54001,Durban 4001,South Africa
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
719-723
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）