Extension of the OFDM joint radar-communication system for a multipath, multiuser scenario

In this paper an extension of the OFDM joint radar and communication system concept to cope in a multipath and multiuser environment is explored. A realistic multipath propagation channel model is built with an established ray-tracing algorithm and incorporated into the radar system simulation and one additional user/interferer is then introduced into the scenario for the observation of the radar´s performance. From a theoretical point of view as well as from measurement results, the interferer causes a severe degradation of the radar´s dynamic range, thus requiring an interference cancellation scheme to remove the traces of the interferer. Inherent to the interference cancellation scheme is the phase and frequency offset estimation algorithm for the high fidelity reconstruction of the interferer signal for subtraction from the radar signal which are explored in this paper. The result of the end-system and the improvement to the radar´s dynamic range are then presented.