Abstract: Integrating both sensing and communication in the same spectrum, using shared hardware and signal, is likely to be one of the key features of 6G wireless communication networks. A joint design of both services will have advantages in reducing the costs and improving the efficiency of spectrum usage, allowing communication to enable new radar functionalities and vice versa. Radar sensing may become another service in wireless RF systems provided by mobile network operators, just like communications today. In this talk, we will first present the concept, motivations and applications of integrated sensing and communication (ISAC), and then we will explain recent results about physical layer design for ISAC. In particular, we will show how beamforming as well as waveforms can be designed for dual-functional radar-communication (DFRC) systems. A new model named hybrid radar which fuses UL and DL signals will be presented and evaluated. Performance of a passive radar in the presence of a reconfigurable intelligent surface (RIS) will also be exposed. Finally, we will discuss open research challenges and future directions.
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