part_2_channels - CIS 6930 Powerline Communications Richard...

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CIS 6930 Powerline Communications Richard Newman Spring 2010
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Channels - Outline Bands Frequency-dependencies/impulse response Noise Transmission limitations
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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
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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)
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Frequency Dependent Fading 0 0 .5 1 1 .5 2 2 .5 3 3 .5 4 4 .5 5 5 .5 0 .01 0 .05 0 0 .05 T im e (uS ) V o lts 60 40 20 A tenua tion (dB )
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Frequency Dependent Fading 0 0 .5 1 1 .5 2 2 .5 3 3 .5 4 4 .5 5 5 .5 5 10 4 0 5 10 4 T im e (uS ) V o lts 80 60 40 A tenua tion (dB )
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Frequency Dependent Fading 0 0 .5 1 1 .5 2 2 .5 3 3 .5 4 4 .5 5 5 .5 2 10 4 0 2 10 4 T im e (uS ) V o lts 80 60 40 A tenua tion (dB )
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