Cyclic spectrum-based algorithm of estimating amplitudes for single antenna mixture

Aimed at non-cooperative communication field an amplitude algorithm is proposed for single antenna MSK mixing signals. Cyclic spectrum is deduced and amplitudes of mixing components are estimated by searching high-intensity spectral lines along cyclic frequency axis at zero frequency. The envelop of spectrum leakage introduced by fast cyclic spectrum calculation is applied to eliminate the illegibility of spectral line selection and modify amplitudes of cyclic spectrum. Simulation results show its good performance for mixing signals without large power difference between two signal components when the SNR is greater than-15dB. It does not require any prior information and the estimation accuracy can meet the needs of lower SNR applications.