part_4b_issues - CIS 6930 Powerline Communications Special...

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CIS 6930 Powerline Communications Special Issues Prof. Richard Newman Spring 2010
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Special Issues in PLC Noise PCS/VCS Hidden nodes High speed issues Cross-layer design Coexistence
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Noise Low transmit power Statutory limits on emissions in varous bands Vary by country – FCC part 15 rules in US Lower in Europe, Japan, Korea High interference Dynamic and frequency-specific noise Impulse noise
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Carrier Sense Desirable to avoid collisions Carrier sense (determine if medium is busy) Physical Carrier Sense (PCS) Possible in media with good SNR, strong carrier Not feasible in PLC, wireless Virtual Carrier Sense (VCS) Needed when PCS not possible Detect synch/delimiters Increases logic, complexity, time
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Virtual Carrier Sense Needed when PCS not possible Carrier(s) difficult to detect directly (SNR) Detect synch/delimiters Circuit matches synch pattern when searching Looks for delimiter following synch
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part_4b_issues - CIS 6930 Powerline Communications Special...

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