Statistical model study for Narrowband Power Line Communication Noises

Statistical model study for Narrowband Power Line Communication Noises

Noise is one of the main problems for the Power Line Communication (PLC) system. Noise parameters vary from country to country. They depend on time, place, load types, power line topology and mains voltages. This is annoying issue for researches who try to make a mathematical model to understand noise characteristics. Therefore a lot of measurement campaigns should be done before setting up a mathematical model and also model has to include statistical studies. The subject of this paper is the development of a statistical noise model for Narrowband PLC in the low voltage network. Noise model parameters were derived from measurements of the mains voltages in using Data Acquisition card (DAQ) and a digital signal processing program. Results of this model obtained very akin to present situations. Contribution of this study is that it helps the researcher to work independent of power line voltage and frequency.

Published in:

Electrical and Electronics Engineering (ELECO), 2013 8th International Conference on

Date of Conference:

28-30 Nov. 2013

Electronic Noise Is Drowning Out the Internet of Things

Here is a perfect example of the ignorance surrounding the noise pollution on the so called smart grid.   The Noise pollution I am writing about is not understood or acknowledged by engineers because of ignorance of the reality that this problem exists and the authorities whom have had this issue brought to their attention are not enforcing the laws. Urban, suburban, rural…it is everywhere 24/7….. Sandaura

Electronic Noise Is Drowning Out the Internet of Things

Our increasingly connected world needs better protection against RF noise pollution

/img/09OLRF%20Noisespot-1439570602395.jpg
Illustration: Lou Brooks

Believe it or not, there hasn’t been a systematic study of radio-frequency noise in the United States since the mid-1970s, when the Institute for Telecommunication Sciences (ITS), a part of the National Telecommunications and Information Administration, last monitored federal use of the radio spectrum. By then, man-made electronic noise had been a problem for nearly half a century, having started with the inauguration of commercial radio transmissions. In 1934, the International Special Committee on Radio Interference was founded in Paris, and that same year a committee with the same mandate was established by the Institute of Radio Engineers, a forerunner of the IEEE. The noise problem grew with the use of electricity and the number of wireless systems, although many details have changed over time.

http://spectrum.ieee.org/telecom/wireless/electronic-noise-is-drowning-out-the-internet-of-things

Power Line Carrier RF Signal Always on and it is a Pure Tone

We must demand  a Federal investigation into the Environmental pollution caused by the BPL/PLC backbone of the so called smart grid…..Sandaura

Moreover, the report asserts that the field emission requirements for PLT should be somewhat more restrictive than the 20 dBμV/m limit because the PLT signal might be an ”always on” signal, and the geographical concentration of PLT units within a certain area might be fairly high.

NTIA Report 04-413

POTENTIAL INTERFERENCE FROM

BROADBAND OVER POWER LINE (BPL)

SYSTEMS TO FEDERAL GOVERNMENT

RADIOCOMMUNICATIONS AT 1.7 – 80 MHz

Phase 1 Study

VOLUME II

technical report

FF.4 REGIONAL DEPLOYMENT MODEL

In order to assess the aggregated electrical field strength arising from future,

wide-scale deployments of BPL systems, a regional deployment model for BPL networks is proposed herein.

The model characterizes the number and distribution of active BPL

devices across the entire United States. Among other things, the results of this model will be used to characterize the effect BPL systems have on distant federal communication systems due to any increase in background noise level as a result of ionospheric propagation of unintentional BPL radiated emissions. This will also help address concerns that other countries may have with deployment of BPL systems in the United States.

Page B2 shows links to videos of countries testing BPL

OVSV /

Austria Video Showing Effect of PLC in Tirol, Austria

AUSTRIA:  During an emergency exercise of the Austrian

Red Cross in May 2003, communication was massively disturbed by PLC, with interference levels exceeding the limits by a factor 10,000.

___________________

FINLAND:

In October 2001, FICORA measured disturbance levels in the PLC test network in a residential area. The measurements revealed that data transmission caused a significant rise in disturbance levels inside buildings, and outside near buildings and underground cables. The measured levels were significantly higher than NB30.

___________________

“On Radio Interference Assessments of Access PLC System,” JARL/Japan.

Measurements were conducted to evaluate the impact of overhead access PLC to the

amateur radio service and broadcasting service. Three cases were examined. First, the

S/N of an AM signal and SINAD of a CW carrier were measured, and the results showed

unacceptable degradation of HF broadcasting services from PLC interference. Second,

observation using a spectrum analyzer showed that the HF broadcasting signal was

completely jammed by the BPL modem operation. Third, measurement of the far-field

component showed that short wave radio was jammed by the PLC signal at 156 meters

away, and the PLC signal became undetectable at a distance of 200 to 400 meters. The

experiment concluded that access PLC systems jam HF broadcasting and other radio

communication services.

“Interference measurements in HF and UHF bands caused by extension of power line

communication bandwidth for astronomical purpose,” Japan. Two sets of modems,

spread spectrum and OFDM, of the access PLC system were tested for the interference

effect to radio astronomical observation. It was found that in the HF band, the PLC noise

exceeds the level of the galactic noise by more than 30 dB when the two systems were

180 meters apart. In the UHF band, spurious emission near 327 MHz was observed at a

55 meter distance. In both cases, the interference noise exceeds the limit in ITU-R Rec.

RA 769-1 for protection of radio astronomical observation. Safety separations to meet

RA 769-1 limit are estimated to be 219 km and 12 km at 9.2 MHz and 327 MHz,

respectively. The report concluded that PLC is harmful to radio astronomical observation in both the HF and UHF bands.

https://www.ntia.doc.gov/files/ntia/publications/ntia_bpl_report_04-413_volume_ii.pdf

 

 

MICHIGAN-‘Not so fast. Further study needed on smart meters’

Brown City Banner

Council to DTE: ‘Not so fast. Further study needed on smart meters’

By Steven Kovac
810-452-2684 • skovac@mihomepaper.com