Integrated Sensing and Communication-Assisted Orthogonal Time Frequency Space Transmission for Vehicular Networks

Orthogonal time frequency space (OTFS) modulation is a promising candidate for supporting reliable information transmission in high-mobility vehicular networks. In this paper, we consider the employment of integrated (radar) sensing and communication (ISAC) technique assisting OTFS both uplink downlink systems. Benefiting from OTFS-ISAC signals, roadside unit (RSU) capable simultaneously transmitting to vehicles estimating parameters vehicles, e.g., locations speeds, based on reflected echoes. Then, relying estimated kinematic RSU can construct topology network that enables prediction vehicle states following instant. Consequently, effectively formulate transmit beamformers according predicted counteract channel adversity such directly detect without need performing estimation. As transmission, infer delays Dopplers associated with different paths aforementioned dynamic network. Thus, inserting guard as conventional methods are not needed estimation which removes required training overhead. Finally, an efficient detector proposed by taking into account uncertainty. Through numerical simulations, demonstrate benefits ISAC-assisted scheme.