Coordinated precoding for D2D communications underlay uplink MIMO cellular networks

In this paper, we study the coordinated precoding problem for device-to-device (D2D) communications underlay a multiple-input multiple-output (MIMO) cellular network. The system considered here constitutes of multiple D2D user pairs attempting to share the uplink radio resources of a cellular base station (BS). The problem is formulated as a sum-rate maximization (SRM) problem, which subjects to both a interference power constraint imposed to protect the BS and individual transmit power budgets allowed for the D2D user pairs. Because the SRM problem is nonconvex in general, we reformulate it as a difference convex (DC)-type programming problem, which can be solved by employing a successive convex approximation (SCA) method. Moreover, a proximal point-based regularization approach is also pursued to ensure the convergence of the proposed algorithm. Numerical results further show that our algorithm can achieve a near-optimal solution with guaranteed convergence.