Description: Signal identification represents the task of a receiver
to identify the signal type and its parameters, with applications
to both military and commercial communications. In this paper,
we investigate the identification of spatial multiplexing (SM) and
Alamouti (AL) space-time block code (STBC) with single carrier
frequency division multiple access (SC-FDMA) signals, when
the receiver is equipped with a single antenna. We develop a
discriminating feature based on a fourth-order statistic of the
received signal, as well as a constant false alarm rate decision
criterion which relies on the statistical properties of the feature
estimate. Furthermore, we present the theoretical performance
analysis of the proposed identification algorithm. The algorithm
does not require channel or noise power estimation, modulation
classification, and block synchronization. Simulation results show
the validity of the proposed algorithm, as well as a very good
agreement with the theoretical analysis.
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