Kitz Forum

Broadband Related => Broadband Technology => Topic started by: Weaver on January 01, 2019, 02:13:26 AM

Title: DMT - inter-tone spacing
Post by: Weaver 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 ?

Title: Re: DMT - inter-tone spacing
Post by: niemand 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.

https://specification-search.cablelabs.com/CM-SP-PHYv3.1