Device-to-Device Communication with Dirty Paper Coded Simultaneous Transmission

Device-to-Device (D2D) communication allows direct communication of a device to another device without traversing a base station. The overlay D2D operation lets D2D users and cellular users use orthogonal radio resources. There is no interference between D2D and cellular links, but the efficiency of frequency reuse is low. The underlay D2D operation, on the other hand, allows D2D and cellular users to occupy the same radio resources. It has better frequency reuse, but the price paid is complicated interference management which usually requires centralized coordination and a significant amount of channel and traffic information exchange. In this paper, a scheme that allows a user to simultaneously transmit cellular and D2D signals is proposed to improve the D2D transmission rate in an overlay system. The proposed scheme has the advantage of frequency reuse, similar to underlay D2D, but does not need centralized interference management. The system design aspects pertaining to the proposed scheme, such as rate maximization, power allocation and scheduling are investigated. System simulations show that the proposed scheme significantly improves the D2D rate with only a slight impact on the cellular rate.