Dr. R. David Koilpillai
"5G Cellular Systems – New Paradigms and Opportunities"
The growth of wireless and cellular systems during the past three decades has been an amazing journey. From being a highly-priced niche product, cellphones have become a mass-market item affordable by all. Today, by sheer volume, cellular technology has become the driver for technological developments and innovation in all areas of wireless technology, displays, batteries, device integration, smart phone applications, and many more. This talk will provide a brief look at the history of the developments of cellular technology to gain a unique perspective and appreciation of the pace of development.
Some of the key aspects of 4G cellular systems were the introduction of Orthogonal Frequency Division Multiplexing (OFDM) technology as the enabler for broadband wireless systems, MIMO techniques, Interference mitigation, heterogeneous networks (HetNets), Basestation cooperation, and enhanced techniques for resource allocation in time and frequency dimensions. The emergence of cognitive radio promises novel ways of addressing the ever-increasing need for RF spectrum. These technical aspects will be highlighted in this presentation, as an overview of the state-of-the-art.
Following that, the presentation will explore the emerging paradigms in 5G and the opportunities for R&D. It is evident that 5G will not just me an upward migration of 4G systems. With the exponential growth in the number of devices and the data rates, the challenges of 5G require innovative approaches such as network densification, massive MIMO, new spectrum regulations, the use of millimeter wave bands, and many more. All of these features need to be introduced with energy efficiency (green communications) being an important factor. The ability of 5G systems to provide a wide range of services from streaming HD video to low-rate traffic emanating from large numbers of devices forming the Internet of Things (IoT). In addition, newer nodulation methods such as Filterbank Multicarrier (FBMC) and waveforms which improve the spectral efficiency while retaining the advantages of OFDM are being explored.
The aim of this presentation is to provide a perspective on some of these emerging concepts that will drive the research towards 5G. The talk will be tailored for a broad audience working in different aspects of wireless communications.
In June 2002, David joined IIT Madras as a Professor of Electrical Engineering, and is currently the Dean (Planning). During the period April 2008 – December 2009, he served as the CoChair of the IITM special Task Force for setting up the new IIT at Hyderabad. David also served as Head, Central Electronics Centre of IITM during 20010-11. David’s technical areas of expertise include cellular and broadband wireless systems, and DSP techniques for wireless communications. During Jan – July 2007, David was on sabbatical from IITM and served as the Chief Scientist, Centre of Excellence in Wireless Technology (CEWiT), a public- private R&D initiative of the Govt. of India. At CEWiT, David was responsible for launching the national project – Broadband Wireless Consortium of India (BWCI), focusing on emerging broadband wireless standards. Prior to joining IITM, David was at Ericsson USA for twelve years, where he held different technical and managerial positions. In 2000, he became the Director of the Ericsson’s Advanced Technologies and Research Department at RTP, North Carolina. In this role, he was responsible for an R&D team of 75 engineers developing GPRS/EDGE handset technology. At IITM, David has established an active research and teaching programme in wireless communications and DSP.