|Subject:||[Discuss-gnuradio] OFDM based systems - reducing undesired radiation|
|Date:||Thu, 03 Jul 2014 12:25:14 +0100|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0|
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
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