An Algorithm of Frequency Estimation for ESPRIT Frequency-Hopping Signal Based on FFT Rotational Invariance
Sun Wei-ta · Measurement & Control Technology · 2014
The performance of ESPRIT(estimated signal parameters via rotational invariance technique) algorithm about frequency estimation is obviously declined when the SNR(signal to niose ratio) of signal is relatively low.Aiming at this problem,an ESPRIT algorithm based on FFT rotational invariance is presented.In the proposed algorithm,firstly,the FFT(fast Fourier transform) is applied to a signal sample.Then the harmonic coefficients with larger modulus are selected to construct two new data arrays with a retational invariant.Finally,ESPRIT algorithm is used to estimate harmonic frequencies.Theoretical analysis and simulation results show that the proposed algorithm is effective and feasible.