An Overview of Massive MIMO: Benefits and Challenges Lu, Lu ; Li, Geoffrey Ye ; Swindlehurst, A. Lee ; Ashikhmin, Alexei ; Zhang, Rui Abstract Publication: IEEE Journal of Selected Topics in Signal Processing Pub Date: October 2014 DOI: 10.1109/JSTSP.2014.2317671 Bibcode: 2014ISTSP...8..742L