I just read up on the details OFDM. I reached an interesting conclusion that
I would like verified:
The raw bit rate is the same as the bandwidth and is independent of
the symbol rate.
The frequency spacing for OFDM is 1/Ts where Ts is the symbol period. Since
1/Ts is also the symbol rate (Sr) then Sr = dF where dF is the difference in
subcarrier frequencies. The number of subcarriers (Sn) is then Sn = B/dF
where B is the bandwidth.
The raw bit rate, assuming 1 bit per channel per symbol, is bps = Sn * Sr
or bps = B/dF * Sr but bps = B/Sr * Sr so bps = B.
The raw bit rate for a 500 Hz bandwidth OFDM is 500 bps regardless of the
symbol rate.
If I have not slipped up that means a slow symbol rate OFDM is a better
choice because it become impervious to multipath delays and therefore does
not need a guard interval on the symbols.
Rud Merriam K5RUD
ARES AEC Montgomery County, TX
http://TheHamNetwork.net
