CoMP in heterogeneous networks: A low-complexity linear transceiver design

Coordinated multipoint transmission (CoMP) is considered for a heterogeneous network where different kinds of base stations (BS) are located. We focus on linear transceiver design with the goal of maximizing the weighted sum rate in the downlink of a multiple-input multiple-output orthogonal frequency division multiple access (MIMO-OFDMA) system. The problem is shown to be non-convex, thus, the problem of finding the global optimum is an intrinsically intractable, NP hard problem. We propose an algorithm which divides the main problem into several convex subproblems, and, is shown to provide efficient suboptimal solutions.