Resolution and unmasking of CLEAN and LMMSE algorithms using coded waveforms

OFDM waveforms offer strong advantages for integrated communication and radar systems. Nevertheless they require signal processing at the receiver that can serve for sidelobe suppression in order to avoid target masking. In this paper two reiterated filtering techniques, LMMSE and CLEAN, are considered and compared for this type of signal to evaluate their unmasking and resolving capabilities. Masking of a weak target in the sidelobes of a strong target is considered, but also resolution of strong targets spaced equal or less than a resolution cell. Moreover the performance of reiterated LMMSE and CLEAN is compared for OFDM and P3 coded waveforms. When Doppler is present both LMMSE and CLEAN performances degrade.