IQ-Imbalance Compensation for Wideband OFDM-Radar

Orthogonal frequency-division multiplexing is a promising modulation format for future automotive radar sensors. Although it benefits from a simple homodyne transceiver design, it requires quadrature signal generation and evaluation, which suffers from IQ-imbalance at transmitter and receiver. This paper describes the effects of IQ-imbalance on OFDM radars in general and demonstrates how digital signal processing techniques can be adopted to mitigate this impairment based on adaptive filtering. The effectiveness of the approach is demonstrated with simulations.