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Research in cognitive radios has renewed interest in tools, such as spectrum estimation and modulation identification, to characterize the Radio Frequency (RF) environment. The use of multiple antennas for Multiple-Input Multiple-Output (MIMO) communications presents a new challenge in detecting and classifying signals. In this paper, the authors propose a cyclostationarity-based statistical test to detect space-time block codes, focusing on the two transmitter Alamouti Space-Time Block Code (STBC). Their test exploits a new characterization of the Alamouti code using fourth order cyclic frequencies.
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