JMT_V1_N4_A1 Chidadala Janardhan Bhagath Pyda J. Manohar K.V. Ramanaiah Journal on Mobile Applications and Technologies 2394-0239 1 4 1 12 Massive MIMO, Cognitive Radio Antennas, Low Power Handheld Devices, Smart Phones, Spatial Multiplexing The fourth generation wireless communication systems have been deployed or are soon to be deployed in many countries. Wireless system designers have been facing the continually increasing demand for high data rates and mobility required by new wireless applications and therefore have started research on fifth generation wireless systems that are expected to be deployed beyond 2020. In next-generation wireless data networks, Massive Multiple Input Multiple Output (MIMO) is an exciting area of 5G wireless research. It promises significant gains that offer the ability to accommodate more users at higher data rates with better reliability while consuming less power. Massive MIMO has been identified as one of the promising disruptive air interface technologies to address the massive capacity requirement demanded by 5G wireless communications. Massive MIMO, also called Large-Scale Antenna Systems, is a promising candidate technology for meeting this demand. In this paper, the authors have discussed various promising technologies for 5G wireless communication systems, such as massive MIMO, energy-efficient communication techniques, and the key challenges and potential technologies for smart mobiles. November 2014 - January 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3516