13-02-2016, 03:47 PM
Abstract
The phenomenal growth in mobile data traffic calls for a drastic increase in mobile network capacity beyond current 3G/4G networks. In this paper, we propose a millimeter wave mobile broadband (MMB) system for the next generation mobile communication system (5G). MMB taps into the vast spectrum in 3 – 300 GHz range to meet this growing demand. We reason why the millimeter wave spectrum is suitable for mobile broadband applications. We discuss the unique advantages of millimeter waves such as spectrum availability and large beamforming gain in small form factors. We also describe a practical MMB system design capable of providing Gb/s data rates at distances up to 500 meters and supports mobility up to 350 km/h. By means of system simulations, we show that a basic MMB system is capable of delivering an average cell throughput and cell-edge throughput performances that is 10 – 100 times better than the current 20- MHz LTE-Advanced systems.
INTRODUCTION
Mobile communication has been one of the most successful technology advancements in modern history. The combination of technology breakthroughs and product innovation has made mobile devices an indispensable part of life for more than 5 billion people. The increasing popularity of smart phones and tablet computers suggests that the demand for mobile broadband will continue to grow in the foreseeable future. The current 4G LTE system uses advanced technologies such as OFDM, MIMO, Turbo Code, Hybrid ARQ, and sophisticated radio resource management algorithms. These technologies are made possible by decades of extensive research in wireless communication and systems. Still, continuous improvements in air interface are being considered by introducing new techniques such as carrier aggregation, higher order MIMO, Coordinated Multi-Point (CoMP) processing, etc. However, further improvements in spectral efficiency appear extremely challenging .Another possibility to increase capacity in a given area is to increase frequency reuse by deploying smaller cells, e.g. femto-cells. However, the number of cells that can be deployed in a given area can be limited due to several cost factors such as site-acquisition, equipment installation, and backhaul provisioning. Therefore, small cells alone are not expected to meet the orders of magnitude increase in mobile data traffic demand in a cost effective and scalable manner.