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This paper focuses on blind channel estimation in Alamouti coded systems with one receiving antenna. The authors present a comparative study of several blind channel estimation techniques, based on High Order Statistics (HOS) and Second Order Statistics (SOS), in realistic indoor scenarios. These methods are based on eigen-decomposition of a square matrix formed with statistics of the observed signals. They also exploit the orthogonality property of the Alamouti coded channel matrix. Experimental evaluation is carried out using a MIMO testbed at the 2.4 GHz band. The results show the excellent performance of the SOS-based blind channel estimation technique in either Line Of Sight (LOS) or Non-LOS (NLOS) indoor scenarios.
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