Performance Analysis of Beamforming for Radar and Communications Coexisting Systems

Several studies have been conducted for designing beam synthesis in radar and communications combined systems, in pursuit of enhancing the performance of the target detection and wireless communications simultaneously. However, their channel models, assuming no characteristics of directionality, are unrealistic in the sense that the radar channels should in general be line-of-sight (LOS), whereas the communications channels are often none-LOS (NLOS). In this paper, the performance of the previous schemes is re-evaluated under a practical environment in which the radar channel is LOS while the communications channel is NLOS. With careful consideration of the directionality of ray-based channels, numerical results reveals clear trade-off between the minimum signal-to-noise-plus-interference-ratio and peak to side lobe ratio.