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Author Topic: DMT - inter-tone spacing  (Read 588 times)


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DMT - inter-tone spacing
« on: January 01, 2019, 02:13:26 AM »

Say I am designing a DMT / OFDM system, how do I decide on the frequency spacing between the tones / carriers ?


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Re: DMT - inter-tone spacing
« Reply #1 on: January 01, 2019, 09:25:21 AM »

You defer to people with doctorates in the required disciplines and let them decide ;)

More seriously it depends on absolutely tons of stuff. How good you expect the transmitters and receivers to be, the media the signal is propagating through, the frequency range in use, etc.

This might help given I'm a cable guy - here're the physical layer specifications for DOCSIS 3.1 which uses OFDM - for obvious reasons given this is the actual specification the level of detail is very high, and as a bonus it's free.
WiFi: Nighthawk® AX12 RAX120 - 5Gb uplink
Routing: Ubiquiti UDM Pro - 10Gb uplink
Switching: 2 * Mikrotik CRS305-1G-4S-IN, 10Gb uplinks, various cheap and cheerful
Exchange: Wakefield
ISP: BT Full Fibre 900. Yes, BT, I know.