Robust Source Number Estimation Based on Denoising Preprocessing

This paper presents an accurate source number detection method for array antennas or MIMO (Multi-Input Multi-Output) radars. DOA (Direction of arrival) estimation is one of the significant techniques in high-speed wireless communication and radar imaging. Most of the representative DOA estimation methods requires the source number information in advance, however the classical methods AIC or MDL are often used. Those methods often fails to estimate source number in severe environments like low SNR or large transmission power difference. Recall that received signals are often bandlimited or narrowband signals, the proposed method first applies denoising preprocessing by removing undesired components, and compare the original and denoised signal information. Performance of the proposed method is evaluated through computer simulation.