Cyclic beamforming using fractional Fourier transform domain cyclostationarity

A minimum mean-squared error(MSE) beamforming algorithm employing the optimum fractional Fourier transform(Opt-FrFT) domain second-order cyclostationarity is proposed. This method can efficiently filter out the compact desired chirp signal, with a consequence that the cyclically uncorrelated interferences and stationary(colored) Gaussian noise are greatly suppressed in the Opt-FrFT domain. This improves the MSE minimization cyclic beamformer by reducing effectively the Opt-FrFT domain signal-noise cross terms in the presence of finite data length de-correlation operation. Simulation results show that the new method works well under a wide range of signal-to-noise ratio(SNR) and signal-to-interference ratio(SIR). Copyright © by High Technology Letters Press.