D2D is Used to Improve MIMO System Gain in 5G Power Communication Networks

D2D communication technology refers to a communication mode between two peer user nodes. Each user node can send and receive signals, which has the function of automatic routing (forwarding message) in a decentralized network composed of D2D communication users. A framework model of device-to-device (D2D) communication in MIMO system based on random geometry is proposed. D2D communication is introduced to improve the performance of large-scale multi-input and multi-output cellular systems. Assuming that the maximum rate transmission or zero forced precoding scheme is used for cellular downlink transmission, the rate that can be achieved by cellular users is analyzed and deduced. If users are close to each other, they can share the same internal precoder and have the same spatial covariance matrix. In this case, user cooperation among these users can be realized through D2D link sharing receiver information to improve the efficiency of the communication system. The simulation results are consistent with the theoretical results and our model is validated.