活动/讲座时间：2012-05-30 下午14:30-15:30PM

活动/讲座地点：九里校区信息楼01409#

活动/讲座嘉宾：Dr Des McLernon, Director, School of EEE, the University of Leeds, UK

嘉宾介绍：

Dr Des McLernon (who is from Ireland) received his B.Sc in electronic and electrical engineering and his MSc in electronics， both from the Queen’s University of Belfast， N. Ireland. He then worked on radar systems with Ferranti Ltd in Edinburgh， Scotland and later joined Imperial College， University of London， where he took his PhD in signal processing. After first lecturing at South Bank University， London， UK， he moved to the School of Electronic and Electrical Engineering， at the University of Leeds， UK， where he is a Reader in Signal Processing and is the Director of Graduate Studies. His research interests are broadly within the domain of signal processing for communications (in which area he has published 227 journal and conference papers (see below)， supervised over 20 PhD students， is associate editor of IET journal “Signal Processing” and has been a member of various international conference TPC’s. he also helped organise IEEE SPAWC 2010 and EUSIPCO 2013.

The School of Electronic and Electrical Engineering， University of Leeds， is rated first in research in its field in the UK. The UK government undertakes a very intensive research assessment exercise (RAE) to evaluate the standard of the research activities in every department， in every subject， in every UK university (http://www.rae.ac.uk/). In the 2008 RAE results:

(i) Leeds E&EE is rated first for research in the whole of the UK across all E&EE schools;

(ii) Leeds E&EE is rated first for research in Leeds university when compared with ALL other Leeds university subjects/departments.

Des McLernon (http://www.engineering.leeds.ac.uk/people/electronic/staff/d.c.mclernon， Email: d.c.mclernon@leeds.ac.uk)

主要内容：

Security in wireless networks is a major concern. Indeed, eavesdropping is a well-known security vulnerability in wireless networks due to their broadcast nature. Traditionally, the way to partially prevent eavesdroppers’ attacks is based on computationally demanding cryptographic algorithms implemented in the upper layers of the communication model. In this context, physical layer security has recently emerged as an alternative way to augment the system security by exploiting the spatio-temporal variations of the wireless channel.

This presentation first addresses the basic concepts behind physical layer security. It then develops an analysis of the contribution of frequency selectivity to the security of the system and also a novel outage probability-based power allocation mechanism. Beamforming and artificial noise generation is chosen as the multiple antenna secure transmit strategy, with the basic principle being that the artificial noise only affects the eavesdropper.

Security in multiple-input-multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) networks is then studied to show that frequency selectivity improves the secrecy of the system. However, the eavesdropper’s capabilities such as multiple antenna support, the beamforming strategy used and the amount of information available regarding the transmit strategy could put at risk the overall system’s security.

Finally, I will present the latest results on robust beamforming with artificial noise over militarised zones for Physical Layer security.