Performance of reiterated LMMSE filtering and coded radar waveforms

OFDM waveforms offer strong advantages for integrated communication and radar systems. Nevertheless they require filtering at the receiver that can serve for sidelobe suppression in order to avoid target masking. However unmasking is not the only concern, it is crucial to evaluate the filtering scheme both in terms of sidelobe suppression capability but also in terms of output signal to noise ratio. This last criterion is essential when aiming at detecting also weaker reflections. In this paper the theoretical performance of the reiterated filtering technique based on LMMSE is derived and compared to the matched filter. The unmasking capabilities are relevant, but also output power figures. Moreover the performance of reiterated LMMSE is evaluated for OFDM communication-encoded radar waveforms.