An adaptive cooperative downlink transmission scheme for wireless network with distributed antenna system

Multi-Cell MIMO Cooperative downlink transmitting can reduce the system interference and enhance capacity in cell edge. In this paper, wireless network with distributed antenna system (DAS) is discussed and the downlink ergodic capacity of radio signal intersection area in three remote antenna unit (RAU) scenario is investigated for problem observation. Then we propose an adaptive cooperative downlink transmission scheme to enhance system capacity. In this proposed scheme, large-scale fading information between MS and RAUs is employed to decide the most appropriate mode from three available modes named CT-1, CT-2, CT-3. Selection criterion is the ergodic capacity corresponding three transmission modes. Simulation results show that the proposed scheme can achieve high capacity and reduce the system interference significantly.