1. Cisco. Cisco visual networking index: global mobile data traffic forecast update, 2013-2018. http: //www.cisco.com/ c/en/us/solutions/collateral/service-provider/visual-networking-index-vni/white paper c11-520862.html. 2014
2. Chen T, Kim H, Yang Y. Energy efficiency metrics for green wireless communications. In: Proceedings of 2010 International Conference on Wireless Communications and Signal Processing (WCSP), Suzhou, 2010. 1–6
3. Alfano G, Chong Z, Jorswieck E. Energy-efficient power control for MIMO channels with partial and full CSI. In: Proceedings of International ITG Workshop on Smart Antennas, Dresden, 2012. 332–337
4. Liu L, Miao G, Zhang J. Energy-efficient scheduling for downlink multi-user MIMO. In: Proceedings of IEEE International Conference on Communications (ICC), Ottawa, 2012. 4394
5. Jiang J, Dianati M, Imran M A, et al. Energy-efficiency analysis and optimization for virtual-MIMO systems. IEEE Trans Veh Tech, 2014, 63: 2272–2283