The design and implementation of FPGA subsystem in D2D communication based on LTE network

Device-to-device (D2D) communication, as one of the hot topics in wireless communications recently, has been proven to improve the spectrum efficiency effectively. To realize the potential advantages of D2D communication, the designs of new radio resource management algorithms, physical layer procedures and peer discovery methods are needed. In this paper, a new system of D2D communication has been designed. On the basis of this, we focus on the design of the FPGA subsystem of physical layer and give a qualitative analysis of the performance. Results show that the system performs very well, has little influence on the current architecture of LTE and no harmful time deviation is incurred. The maximum discovery distance of D2D system we proposed can reach to 360 m, which outperforms Wi-Fi a lot. Furthermore, D2D communication is faster and more security than Wi-Fi, Bluetooth and Infrared.