Target Detection Improvement in OFDM-IM JCR System using POGM

In this paper, we propose an index modulated orthogonal frequency division multiplexing (OFDM-IM) based JCR system capable of generating target profiles with very high peak-to-sidelobe ratio (PSLR). The modulation symbol cancellation method used in the conventional OFDM radar systems can be used only for the active subcarriers in the OFDM-IM systems resulting in partial channel information. The proposed JCR system recovers the full channel information without using modulation symbol cancellation and signal reconstruction; therefore, it is able to produce range-velocity profiles with high PSLR. Multi-target scenarios are considered in this paper, where the target detection and parameter estimation are carried out by using the proximal optimized gradient method (POGM), which is a sparse recovery algorithm. Simulation results show that the target parameters are estimated accurately, irrespective of the number of active subcarriers used in the OFDM-IM signal.