In addition to the wireless module, I started working on infrastructure to support a network of devices. I'm using a USRP to coordinate a group of these things and respond in real time to changes in the spectral environment. This is really important in TV Whitespace, because wireless microphones are also in that band and need to be avoided when sensed. Cognitive radio in general is a neat and highly active research topic, so it's good for other applications too.
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To save time, I've also been using SimpliciTI as a mesh networking stack. It's open source, but not as free-as-in-speech as I'd like, so I plan on moving away from it. Until then, all SimpliciTI code is distributed under TI's license agreement, which can be found in the github repo which is linked over to the left.
There is also some experimental code for talking with SimpliciTI and doing other whitespace things with a USRP in gnuradio. That's in the Cognitive Basestation repo linked to the left.