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This paper considers the problem of detecting a QPSK communication signal on carrier. We propose a method to perform the detection thanks to second order cyclostationarity theory. It is well known that for such a signal, there is no cyclic frequency multiple of the studied signal carrier frequency. Hence, the basic method of second order cyclic-moments energy measurement is unable to detect any energy directly linked to the signal carrier. In this article, we propose a novel criterion based ondoi:10.1109/wcnc.2018.8377024 dblp:conf/wcnc/GrollierH18 fatcat:ahkaj46c55gurftae5zfytpcoa