A new algorithm for QAM signal classification in AWGN channels
Drumright, T.A.; Zhi Ding
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Volume 1, Issue , 2002 Page(s): I-849 - I-852 vol.1
Digital Object Identifier   10.1109/ISCAS.2002.1009974
Summary: A method for quadrature amplitude modulation (QAM) constellation classification is proposed by exploiting the phase information of noisy characteristic functions. This method of classification is theoretically and asymptotically invariant to the presence of additive white Gaussian noise, thus allowing for lower classification error. A simple yet effective method for extracting phase information from the characteristic function is presented. This QAM classifier, tested against a known fourth order cumulant method, is shown to be very effective at moderate SNR. It also shows some desirable traits that enable it to be complementary to the cumulant algorithm.

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