Blind estimation of star-QAM carrier frequency based on the cyclostationary cumulants
Luo Ming · Systems engineering and electronics · 2008
Aiming at the real application of the communication countermeasures and QAM signal demodulation,a method is proposed to estimate the carrier frequency of star-QAM signal using the high-order cyclostationary cumulants.Due to the fact that the high-order cyclostationary cumulants can suppress the stationary and non-stationary Gaussian noise,it is proved by theoretical analysis under the above noise background that the specific four-order cyclostationary cumulants of the star 8/16 QAM signal exist only at the location of its carrier frequency,so that the carrier estimation can be implemented by detecting the cyclo-frequency.And simulation also proves the effectivity of the proposed method.