Consider a network that consists of one multi-antenna base station (BS) and multiple pairs of multi-antenna user equipments (UEs). In each UE pair, the communication between transmitter and receiver is established either through BS or via device-to-device (D2D) link. All the D2D transmission and the uplink transmission of BS relaying share the same resources, while causing interference to each other. To improve the network throughput, we consider a sum-rate maximization problem by jointly optimizing the transmission mode of each UE pair and the corresponding transceivers. Due to the NP-hardness of the problem, we seek for some efficient approximate solutions to it. To this end, we first reformulate the problem by the weighted MMSE (WMMSE) approach, and then fit it into the alternating direction method of multipliers (ADMM) framework. Finally, an efficient distributed algorithm, which converges to a stationary solution, is developed. In particular, each step of the algorithm can be computed in closed form, thus giving it very low complexity.
['Jingran Lin', 'Qingjiang Shi', 'Qiang Li']
Joint device-to-device transmission activation and transceiver design for sum-rate maximization in MIMO interfering channels