Examining PhDs BS Chowdhry goes to Ireland Engr. Prof. Dr. Bhawani Shankar Chowdhry of Mehran University of Engineering and Technology has been invited by Electronics Department, University of Limerick, Ireland as an External Examiner to conduct PhD examination of Mr. Sven Zacharias of his thesis on “Effects, Classification and Mitigation of External Interference in IEEE 802.15.4-based wireless Sensor Networks at 2.4 GHz”. The researcher Sven Zacharias has summarized his PhD work – Low power wireless transmission technology behind Wireless Sensor Networks (WSNs) and ZigBee. Since IEEE 802.15.4 is a low power technology, the mitigation of interference is vital to conserve energy and to extend devices’ life. Most IEEE 802.15.4 radios operate in crowded 2.4 GHz frequency band, also used by many other technologies. A complete study of common sources of external interference, namely IEEE 802.11-based Wireless Local Area Networks (WLANs), Bluetooth and microwave ovens, is provided. The effects of these coexisting technologies on IEEE 802.15.4 are investigated and modelling of the interference is discussed. Possibilities of energy detection, feature behind received signal strength indication and certain clear channel assessments are evaluated. Based on CCAs, a lightweight interference classi?cation algorithm is presented to classify the common external sources of interference in the 2.4 GHz frequency band without demodulation of the inteferers’ signals. As the classi?cation algorithm relies on time patterns instead of spectral features, it has no need to change the channel. Thus, it allows radio to stay connected to both channels while the interferer is classi?ed. Plus, interference mitigation strategies are reviewed and evaluated about their effectiveness to overcome three external sources of interference. By combining the interference classi?cation algorithm and chosen mitigation strategies, Interference Aware Self-Adapting Medium Access Control is developed. This smart interference mitigating MAC protocol is implemented in ContikiOS and evaluated. Prof Chowdhry has rich experience in diversified fields like electronics, computer systems, telecom, microprocessor technology, intelligent instrumentation, wireless sensors, telemedicine, e-commerce, remote sensing, computer application and system optimization; project appraisal, supervision and management; policy, planning and implementation of programs and strategies etc. He has so far supervised/ co-supervised 7 PhDs and over 50 MPhil/ Masters thesis in ICT. He has over 60 research papers published in national and international journals, IEEE and ACM proceedings. He also has edited books on ‘Wireless Networks, Information Processing and Systems’, CCIS 20, and ‘Emerging Trends and Applications in Information Communication Technologies’, CCIS 281 published by Springer Verlag, Germany besides over a dozen books published nationally. He is also Guest Editor of special issues of Impact Factor International Journal of Wireless Personal Communication, published by Springer Germany / USA. He is recipient of HEC University Best Teacher Award 2001 and National Cultural Award-2002 for his achievements in Engineering Profession and Presidential Highest Academic Distinction Award (Izaz-e-Fazeelat).Dr Chowdhry is active in national and international scientific bodies as: Chairman IEEE Inc USA; Communication Society, Karachi Chapter; Fellow IEP; Senior Member, IEEE USA; Association of Computer Machinery, USA; Member IEEE Industrial Electrical Society; IEEE Communication Society; IEEE Society on Social Implications of Technology; IEEE Education Society; IEEE Instrumentation and Measurement Society; International Society for Telemedicine and e-Health, Switzerland; World Federation of Engineering Organizations, France; International Association of Engineers; Engineering Accreditation Committee PEC; Expert Reviewer of IEEE Conferences; ICTR and D, and HEC Experts Committees; Honorary Consulting Editor ‘Engineering Review’ and ‘Wire and Wireless’; Chief editor ‘IT Vision’. He is also lead person of several EU funded Erasmus Mundus Human Resource Development Scholarship Projects such as “Mobility for Life”, “ STRoNG-TiES” (Strengthening Training and Research through Networking and Globalisation of Teaching in Engineering Studies), and INTACT (Its Time for Collaboration Towards Close Cooperation)
Posted on: Tue, 24 Jun 2014 06:08:22 +0000
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