[Discuss-gnuradio] High frequency OFDM

[Joachim Roop]

Hi,

I successfully implemented OFDM with two USRPs with LFRX/LFTX at 1-50MHz, 
connect by cable. Now I tried switching over to higher frequencies via 
TVRX/WBX. While I receive a perfectly valid looking spectrum with a good SNR, 
it does not seem to decode at >200MHz.
If I increase the sub-carrier spacing of the transmission and thus the 
bandwidth, it works again. But why do I have to do that if the signal and SNR 
look okay?

What destroys a OFMD signal at high frequencies? Is it phase noise? Is the 
USRPs frequency resolution different at higher frequencies?

Any literature/papers on this topic would also be helpful - I am kind of stuck 
here.
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