Automotive short-range radar systems use the radio spectrum to detect obstacles such as other vehicles or pedestrians. Radar can alert the driver for possible impact, automatically trigger safety devices and ultimately undertake manoeuvres to avoid or mitigate collisions. Thus, according to 5G vision document , in the context of road transport, we will see fully automated vehicles equipped with short-range radar in near future. The mm-wave band (beyond 30GHz frequency) for radar is very promising approach for automotive industry mainly due to two reasons. First, larger bandwidth of higher frequencies provides finer resolution of the estimated target, and hence better performance at short-ranges. Second, significant progress in Silicon based MMIC technologies and low cost packaging capabilities of mm-wave short-range radar make it as a cost-competitive and affordable frequency band. It is recognized that the mm-wave solution is a long-lasting solution for all vehicle manufacturers to improve active safety devices, thus European Commission defined the frequency range 77 GHz to 81 GHz (79 GHz) for short-range automotive radar system. On the other hand, according to 5G vision, future vehicles will be connected as connectivity is a key enabler for provision of further level of safety to our road transport system. Due to the idea of Internet of Things (IoT) as a driver for a planned growth in Vehicle-to-Vehicle (V2V) and Vehicle-to-Everything (V2X) communications, high demands for high data rates are predicted which make it impossible to work in current dedicated frequency bands for V2V and V2X communications. One of the promising frequency spectrum for such a high gigabit rate communication is mm-wave spectrum and by laws of physics, the shorter the wavelength, the shorter the transmission range for a given power. Consequently, the trend of spectrum allocation for short-range communications system is shifting toward mm-wave spectrum. These two aforementioned facts motivate us to design a unified architecture for a joint radar-communication scenario applied in a network of future smart connected cars to support both short-range radar and data communications. The key motivation behind this unified system design is to address the problem of spectrum shortage through coexistence where both systems can share the same frequency band and use it more efficiently than two traditional separate systems.