Carrier frequency and phase offset measurement for single carrier digital modulations

A method for measuring both the carrier frequency and the carrier phase offset in the case of single carrier digital modulation is presented. The method concerns with (i) the amplitude modulated signals. M-ary quadrature amplitude modulation and M-ary amplitude shift keying, and (ii) the angle modulated signals, M-ary phase shift keying and M-ary frequency shift keying. The carrier frequency is evaluated by means of the zero-crossing sequence, the carrier phase offset is evaluated by analyzing the I-Q representation of the input base-band signal in comparison with the ideal standard constellation. Experimental tests carried out on both simulated and actual digital modulated signals highlight both the method performance and accuracy.