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CIS 6930 Powerline Communications Powerline Channels

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

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CIS 6930 Powerline Communications Powerline Channels

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

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

  3. 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

  4. 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)

  5. Frequency Dependent Fading

  6. Frequency Dependent Fading

  7. Frequency Dependent Fading

  8. 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

  9. Hair Dryer Noise on Power Line

  10. Drill Noise on Power Line

  11. Periodic Impulse Noise

  12. Random Impulse Noise

  13. Random Impulse Noise

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

  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

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