Blind recognition of MPSK signals based on frequency multiplication and constellation

In non-cooperative communication circumstance, a frequency multiplication method with the combination of constellation is proposed, due to the low accuracy of estimated carrier frequency when lacking of the prior information such as signal types. At first, the received signal, assuming a BPSK signal, is extracted the carrier frequency by using the frequency multiplication method. Then the constellations of signal are reconstructed according to the estimated carrier frequency, and the constellations can be utilized to extract modulation identification parameters. Experiments have confirmed this method to have a high success rate in recognition of MPSK signals.