CIS 6930 Powerline Communications Powerline Channels (c) 2010-2013 Richard Newman.

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Presentation transcript:

CIS 6930 Powerline Communications Powerline Channels (c) Richard Newman

Channels - Outline Bands Frequency-dependencies/impulse response Noise Transmission limitations

Bands Low frequency: 0-1KHz Utility use for control Medium frequency: 1 Khz- 1 MHz Residential and commercial control, radio High frequency: 1 MHz – 100 MHz Broadband – IH and AC Ultra-high frequency: > 100 MHz

Frequency Dependent Fading Multiple reflection points in medium Wire gauge changes Sharp turns in wiring Junction box connections Causes frequency dependent fading Longer impulse response => ISI Load changes affect channel Every path is unique (even in each direction)

Frequency Dependent Fading

Noise Sources Brush motors Hair dryer, drill, mixer, blender, etc. Usually intermittent Periodic impulses Switching power supply, halogen lamp, etc. Severe noise power Random impulse noise Light dimmer switch, power system “glitches” Cyclostationary noise Radio interference Amateur radio transmitters

Hair Dryer Noise on Power Line

Drill Noise on Power Line

Periodic Impulse Noise

Random Impulse Noise

Transmission Limitations Transmit Spectrum Mask (USA – FCC part 15)

Transmission Limitations FCC Part 15 Rules Limits emitted power over spectrum Must not interfere with licensed users Must not interfere with other legit users Deep “notches” in 2-30 MHz band Lower above 30 MHz International regulations European rules are similar, more restrictive Rules in Asia by country, in many, no rules