Simple data bus over DC Power Wires

On Wed, 01 Aug 2012 09:39:54 -0500, GetErDun


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A reasonable line code is to try injecting frequency division multiplexed signals over 2 MHz to 10 MHz - transmitting at a quiet part of the spectrum. At base level: 1 is a sinewave on, 0 is a sinewave off. A reasonable self-clocking constant rate line code is to use 1011 as 0 and 1010 as 1. Error correction would be performed by repeating packets larger and larger number of times in succession until a successful acknowledgement came back. The baud rate would depend again on the channel capacity - i.e. the SNR and could vary from 1 Mb/s down to 100 b/s. Just scan through the frequencies with a mixer suppressing image response by the phasing method and a suitable IF strip, followed by the final mixer and ADC. Just scan through the frequencies for activity. A packet would be bit reversed and be preceded by a framing preamble and would have a MD5 (or SHA1) checksum. There would be a 64 bit packet sequence number and a 64 bit packet type. Acknowledgement packets would give a list of packet sequence numbers. Acknowledgement packets would be acknowledged. There would be sliding windows.
That's all you need for a reliable point-to-point link over power - DEC or AC connections.
Regards,
"Buses are bosons."
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