A method for blind classification of Space-Time Block Codes (STBCs) with a single receive antenna based on elementary fourth-order cumulants is proposed. Firstly,the theoretical values and variance of various signal constellations were obtained by computing the ensemble averages over the ideal noise-free constellation. And then the thresholds were gained by the likelihood ratio test (LRT) for the tests in the hierachical classification scheme. Finally,the automatic classification of modulation scheme was realized by comparing the experimental values and the thresholds. Furthermore,unlike other methods,this algorithm does not require any prior information of the channel coefficients,and noise power and,consequently,is well-suited for non-cooperative context. The simulation shows that the proposed algorithm performs well even at a low signal to noise ratio (SNR).
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2016, Vol. 44 
