Abstract
This paper addresses the issue of recognizing and distinguishing among QPSK modulated signal variants such as QPSK, OQPSK and π/4 - DQPSK, from the samples of received 4 noisy and faded PSK signal. The proposed algorithm is based on computation of relative Euclidean distance and relative phase difference among the received symbols in a frame. Constant Modulus (CM) equalization is performed prior to recognition. Simulation results show that proposed method can perform recognition task with high accuracy even at low Signal to Noise Ratio (SNR) values and employing reasonably small number of data samples. To the best of our knowledge any method for distinguishing among QPSK variants has not been reported in literature.
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