Dual-user joint sensing and communications with time-divisioned bi-static radar

Joint sensing and communications systems have gained significant research interest by merging sensing capabilities with communication functionalities. However, few works have examined the case of multiple users. This work investigates a dual-user joint sensing and communications system, focusing on the interference between the users that explores the optimal performance trade-offs through a time-division approach. Bi-static radar setting is considered. Two typical strategies under this approach are studied: one in which both users follow the same order of communications and then sensing, and the other in which the tasks are performed in opposite order at two users. In each strategy, the sum rate and the detection probability are evaluated and optimized. The results show that the opposite order strategy offers superior performance to the same order strategy, and they also quantify their performance difference. This research highlights the potential benefits of time-division strategies and multiple users in joint sensing and communications systems.