|T2: WiMAX: An Advanced Broadband Wireless System
Presenter: Doru Calin, Bell Labs, Alcatel-Lucent
The tutorial is primarily addressing the emerging broadband wireless solutions as specified by the IEEE 802.16 standards, often referred to as WiMAX (Worldwide Interoperability for Microwave Access) technology. WiMAX is an Orthogonal Frequency Division Multiplexing (OFDM) based system which offers promising high spectral efficiency, scalable carrier bandwidth options (e.g. from 1.25MHz to 20MHz), flexible spectrum options (e.g. 2-6 GHz), multiple duplexing options (Time Division Duplexing & Frequency Division Duplexing), various subchannelization options and users mobility thanks to its 802.16e variant, and more recently 802.16m. Technologies such as Hybrid Automatic Repeat Request (H-ARQ), Space Time Coding (STC), Advanced Antenna Systems (AAS), Multiple Input Multiple Output (MIMO) and Space Division Multiple Access (SDMA) have been enhanced to support mobile environments and to improve the broadband access speed. WiMAX supports a rich set of applications via a connection oriented service flow mechanism in both uplink and downlink directions, where service flow parameters can be dynamically managed through Medium Access Control (MAC) messages in order to meet the Quality of Service (QoS) requirements of various service classes. Examples of supported services are Unsolicited Grant Service (UGS), Real-Time Polling Service (rtPS), and Extended Real Time Polling Service (ErtPS) – particularly suitable for real time applications like speech with activity detection (VoIP). While the 802.16 standards provide a rich set of design options and a great deal of flexibility in defining the WiMAX related products, a significant challenge is often encountered in the selection of the most appropriate set of features & parameters and in finding the desirable deployment scenarios.
The tutorial will provide an overview of the key features specific to the 802.16 standards along with insights into the many flexible system design options offered by these technologies.
Dr. Doru Calin is a Technical Manager at Alcatel-Lucent’s Chief Technology Office and has over twelve years of broad and rich professional experience in the telecommunication industry, wireless arena, cutting edge & applied research (standards, products and services), built at top-notch corporate research labs, both in Europe and USA. His current research interests are in the areas of broadband wireless systems design, support of high quality mobile video and VoIP over broadband wireless networks, cross-layer optimization, converged networks and performance analysis. He has been heavily engaged in the IEEE 802.16 research and development program at Bell Labs in direct coordination with the company business units. Dr. Calin joined Bell Labs in early 2001 and had main lead responsibilities on a multitude of projects in areas including 4G broadband wireless, 3G wireless network planning and optimization, creation of wireless services and economical analysis, wireless geo-location techniques and wireless ad-hoc networks. Prior to joining Bell Labs, he was a researcher at the Institute National des Telecommunications (Telecom INT), France, a technical consultant for Bouygues Telecom (a wireless service provider), and a Senior Research Engineer at Motorola Labs in Paris, France. He holds a M.S. degree in electrical engineering from University of Bucharest, Romania, and received M.S. and Ph.D. degrees in electrical and computer engineering from the University of Versailles, France.
Dr. Calin is a Senior Member of the IEEE and has published over 40 papers in scientific Journals, book chapters and refereed conferences. He holds seven issued patents and has co-authored over fifteen pending patents in the areas of wireless networks and algorithms design. He has received a number of major awards, including the Bell Labs President’s Gold Award and Motorola 3GPP standard award.