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The authors consider detection of signals encoded with Orthogonal Space-Time Block Codes (OSTBC), using multiple receive antennas. Such signals contain redundancy and they have a specific structure, that can be exploited for detection. They derive the optimal detector, in the Neyman-Pearson sense, when all parameters are known. They also consider unknown noise variance, signal variance and channel coefficients. They propose a number of GLRT based detectors for the different cases, that exploit the redundancy structure of the OSTBC signal. They also propose an eigenvalue-based detector for the case when all parameters are unknown. The proposed detectors are compared to the energy detector.
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