My colleague Dr. Apurva Mody (of BAE Systems, IEEE 802.22, and the WhiteSpace Alliance) and I have received a patent on a CSP-related invention we call tunneling. The US Patent is 9,755,869 and you can read it here or download it here. We’ve got a journal paper in review and a 2013 MILCOM conference paper (My Papers ) that discuss and illustrate the involved ideas. I’m also working on a CSP Blog post on the topic.
Update December 28, 2017: Our Tunneling journal paper has been accepted for publication in the journal IEEE Transactions on Cognitive Communications and Networking. You can download the pre-publication version here.
The basic idea is that wideband signals typically possess a multitude of cycle frequencies, many of which are an order of magnitude or more smaller than the signal’s occupied bandwidth. The presence of these cycle frequencies can be detected by processing narrowband (relative to the signal bandwidth) components of the signal. So the entire signal does not have to be captured by a high-rate sampling process in order to assess at least some of its cyclostationarity.
If the cycle frequencies that we can see through these narrowband views of the signal (what we call tunnels) are unique to the signal, then we can detect the signal and recognize its modulation type without the burdens of (1) high-rate sampling and (2) the high cost of our beloved CSP algorithms when applied to large sets of such samples.
Let me know of your interest in this topic in the comments; feedback is helpful in determining my CSP-Blog post priorities.