Kullback-Leibler Divergence Analysis for Integrated Radar and Communications (RadCom)

In this paper, we provide performance analysis for an integrated radar-communication (RadCom) system based on the relative information (RE), also called the Kullback-Leibler divergence (KLD) theorem. The considered system model consists of a multiple-input-multiple-output (MIMO) base-station (BS) which aims at providing RadCom services to multiple communication user equipments (UEs) and detecting a target. The separated deployment, in which the base-station antennas are distributed among radar and communication subsystems, is considered with Zero forcing (ZF) and maximum ratio transmission (MRT) precoders are applied to precode the communication signal. Results show that the derived formulas in this paper are accurate and imply that MRT suffers from bad performance compared to ZF.