Intercarrier Interference Mitigation for Communication Compatible OFDM Radar

This paper presents an intercarrier interference (ICI) mitigation method for orthogonal frequency division multiplexing (OFDM) radar. The effects of ICI on radar performance are analyzed according to dynamic range, peak power, and noise floor. To enhance OFDM radar performance, we propose a two-step ICI mitigation method. Coarse compensation partially restores the target's peak power distorted by ICI and estimates actual velocity of each scatterer without ambiguity. Consequently, fine compensation reconstructs the signal from each scatterer as ICI-free signal. The simulation result shows that the proposed method can restore the target's peak power to the level without Doppler shift, and the noise due to ICI effect can be reduced. Since our method is based on OFDM symbols designed for communication systems, it can eliminate ICI effect in OFDM radar without any loss of communication performance, which is preferable for joint radar-communication systems.