[Discuss-gnuradio] OFDM based systems - reducing undesired radiation

[Germano]

Hello everyone,

I am implementing a cognitive communication system inspired by 
GNURadio's OFDM implementation and some custom designed spectrum sensing 
and management, medium access control, etc.

In order to address OFDM's undesired radiation issues, I am 
experimenting a technique reviewed in this nice post written by Tom 
Rondeau 
(http://www.trondeau.com/blog/2014/4/23/peer-review-of-a-dyspan-paper.html), 
but I'm having problems combining multiple IIR filters in series 
(eventually because of the resulting phase distortion).

There are several techniques that can be found in the literature to 
address this issue, but I found this approach very interesting because 
of its simplicity. Eventually, my future goal is to implement some 
active cancellation sub-carrier style approach to mitigate non-contiguos 
radiation.

I wonder how is the community addressing OFDM's undesired radiation 
issues (non contiguous and out of the band).

Best regards,

Germano