Title： Full-Duplex Wireless Access

Time： 2015年5月21日（周四）上午10:30-11:30

Venue：信电大楼-215学术厅

Speaker：Dr. Himal A. Suraweera University of Peradeniya Sri Lanka

Biography

Himal A. Suraweera received the B.Sc. degree (first class honors) in Electrical and Electronic Engineering, Peradeniya University, Sri Lanka, in 2001 and the Ph.D. degree from Monash University, Melbourne, Australia, in 2007. He was also awarded the 2007 Mollie Holman Doctoral and 2007 Kenneth Hunt Medals for his doctoral thesis upon graduating from Monash University.

Currently he is a Senior Lecturer at the Department of Electrical and Electronic Engineering, University of Peradeniya, Sri Lanka. His main research interests include cooperative communications, energy harvesting and Green communications, full-duplex, massive MIMO, cognitive radio, and wireless security.

Dr. Suraweera currently serves as an Editor for the IEEE Transactions on Wireless Communications and IEEE Communications Letters. He received an IEEE Communications Society Asia-Pacific Outstanding Young Researcher Award in 2011 and the Best Paper Award at the WCSP 2013 Conference. He is a Co-Chair of the Signal Processing for Communications symposium of IEEE GLOBECOM 2015.

Abstract

There is an unprecedented growth in wireless devices and services that demand high data traffic. This has motivated innovative research and development of next generation wireless networks with higher data rates and spectral efficiency. One promising solution to this end is the use of full-duplex access. Devices empowered with full-duplex technology can perform simultaneous transmit and receive operations. In the first part of the talk we will establish theory and development of full-duplex systems.  A number of new models will be introduced: (1) relay topology (2) bi-directional topology and (3) base-station topology. A primary concern for making full-duplex feasible is loopback interference. We will discuss various methods of loopback interference suppression and in particular detail spatial cancellation techniques based on multiple antenna systems. Further we will discuss how the use of full-duplex will be beneficial for applications such as physical layer security, cognitive radio and energy harvesting communications.

In the second part of the talk we will consider a case where a full-duplex multiple antenna access point communicates with single antenna half-duplex spatially random users to support simultaneous uplink/downlink transmissions. We will discuss how precoding schemes can be designed for this network and investigate the sum rate performance using tools from stochastic geometry. The impact of loopback interference and inter-user interference on the average sum rate will be elucidated through the development of simple closed-form expressions that are useful to extract design insights. We also show that full-duplex precoding at the access point improves the uplink/downlink sum rate and hence performance gains as compared to traditional half-duplex mode are possible.