Keynote speeches for ICWMMN2008
Dr. M. Nouri
Chairman ETSI TC-TETRA WG4
Title£º Broadband capability for Wide-area Coverage Emergency Mobile Communication Networks
Abstract£º
The recent enhancement of the TETRA standard to TETRA Release 2 has provided the Public Safety and Security (PSS) networks with a capability to handle concurrent multimedia applications at significantly higher speeds. The technology adopted is termed TEDS (TETRA Enhanced Data Service). TEDS relies on 4 new modulation schemes including the highly spectral efficient 64-QAM, an efficient turbo/coding scheme, 4 different channel bandwidths and the use of link adaptation [1]. This technology has increased the TETRA maximum transmission data rate from 28.8 kbit/s to around 500 kbit/s, which is comparable to 3G technologies. TEDS also introduces the use of sector antennas with a suitable cell re-selection protocol allowing coverage and mobility over TETRA 1 networks without a need for extra BS sites. This results in TEDS having a twin feature of a wide-band capability over a wide-area coverage, not available from current mobile communication networks.
The commercial mobile communication technologies such as 3GPP1, 3GPP2 and the WiMAX family provide higher data speeds to TEDS but suffer from a much smaller coverage mainly due to using higher frequency bands and significantly wider channels. Thus to provide a wide-area network for HSD channels using these technologies requires a high cost penalty if these networks are adopted as an overlay network with a comparable coverage to TETRA networks. It has to be emphasised that a wide-area coverage is a necessary requirement for emergency communications since accidents could happen anywhere. Coverage is not the only advantage of a TEDS enabled TETRA network over the above technologies. Other basic advantages of TETRA networks over commercial HSD mobile communication networks, which makes TETRA an ideal HSD backbone solution for PSS and other mission-critical applications are as follows:
a) Provision of an array of security features superior to those available in commercial 3G networks
b) Having a higher reliability at times of disaster when commercial networks usually are overwhelmed
c) A number of specific features such as network-wide multiple group calls, direct communication mode between mobile terminals, fast call set-up etc.
The above characteristics make TEDS an ideal core network for PSS and emergency mobile communication networks. However, as in 3G networks, there is a need to boost the channel speeds to multi Mbit/s to handle emerging video based and Internet broadband applications. In the case of 3G technologies this has led to further enhancements such as; HSPDA, HSPUA, EVDO family and plans for Long Term Evolution (LTE), which address, among other requirements, a broadband capability.
This paper introduces the salient features of the TETRA release 2 standard and the associated TEDS technology. It then provides a comparison of TETRA with 3G and WiMAX technologies based on considerations such as data throughput, coverage, reliability and security. The comparison will discuss the complementary or competitive nature of these technologies with respect to TETRA.
The paper then proposes how to bridge the "broadband gap" in TETRA whilst maintaining a wide-area coverage and other essential PSS requirements of security and reliability. The proposed solution utilises the essential difference between the PSS and commercial networks, i.e. the former being coverage limited whilst the latter is capacity limited. It is based on an enhancement of the TEDS technology into a "broadband TETRA" technology capable of handling NB, WB and BB applications (including simultaneous multi-media applications) under exact mission critical requirements of PSS and emergency relief networks. The solution is based on a judicious selection of system parameters such as frequency, channel bandwidth, modulation, coding, access method and the antenna system to match the specific requirements of the PSS networks. To make this possible operationally, TC-TETRA is currently in the process of securing new and wider spectrum for the PSS networks.
[1] Nouri, M., et al, "TEDS: A High Speed Digital Mobile Communication Interface for Professional Users", IEEE Vehicular Technology Magazine, Dec. 2006.
Biograpgy:
Mehdi Nouri received his Ph.D. degree in the area of Telecommunications from London University in 1970. Initially he pursued an academic career leading to a position of Associate Professor. In 1979 he joined the GEC-Marconi Company as a specialist in Radio Communications working on Satellite and Mobile Communication Systems.
From 1999 he was appointed the New Technologies Senior Manager for OTE/Marconi, later SELEX Communications, a company within Finmeccanica, the largest Italian defence company.
Dr. Nouri has had a large number of publications in scientific and engineering journals. He has represented his company in many national and international forums including active participation in European Telecommunications Standards Institute (ETSI). He is currently a Consultant and the Chairman of the ETSI Technical Committee TErrestrial Trunked RAdio, (TC TETRA), Working Group 4, responsible for developing the TETRA High-Speed Data standard for professional users. In the 2005 TETRA World Congress Dr. Nouri was presented with the "outstanding contribution" award to development of the TETRA standard.
Professor B. Honary
Department of Communication Systems, Lancaster University,InfoLab21, Lancaster, LA1 4WA, UK.
Emails: {b.honary, b.momahedheravi}@lancaster.ac.uk
Title: LDPC Code Design for Practical Applications
Abstract£º
Structured LDPC codes enable low-complexity decoding as well as efficient implementation of encoder reducing the complexity down to the order of the number of parity-check bits. Construction of structured LDPC codes is based on combinatorial approaches such as Balanced-Incomplete Block-Design (BIBD) and Finite Fields to design quasi-cyclic LDPC (QC-LDPC) codes. Well designed QC-LDPC codes can perform as well as randomly constructed LDPC codes with iterative decoding based on belief propagation in terms of bit-error probability. It has been shown that QC-LDPC codes can achieve lower error floor than randomly constructed LDPC codes.
Within this work, the design of Quasi-cyclic LDPC codes for a range of practical applications is discussed which includes construction of variable-rate large-block-length LDPC codes for DVB-S2 and DVB-T2 applications and adaptive short-block-length LDPC codes for HF applications. Moreover, efficient implementation of QC-LDPC decoder/encoder for FPGA devices which reduces memory requirements is presented.
Biograpgy:
Bahram Honary received his MSc in Digital Communications and PhD in Error Protection Techniques for Bursty Channels from the University of Kent at Canterbury (UK) in 1976 and 1982 respectively.
In 1984, after one year's postdoctoral studies at the University of York, he was appointed a Senior Lectureship at Coventry Polytechnic. In 1988, he joined the Department of Engineering, University of Warwick. In 1992, he took up the position of Chair of Communications Engineering at Lancaster University, where he established the Department of Communication Systems. At present he is leading the research group of over 20 students and staff. His current research interests include: channel coding application to radio communication channels; secure communication applications, power line communication systems, modem design and synchronization. Professor Honary is the chairman of the IEEE Chapter for Information Theory for the UK and Republic Ireland. He is a Fellow of the Institution of Engineering and Technology (IET) and Fellow of the Institute of Mathematics and Applications (IMA).
He has co-authored a book on "Trellis Decoding of Block Codes: A Practical Approach", (co-edited) 12 books on the related areas, published in excess of 480 research papers, organized international conferences and have been invited to present many key note speeches at national/international conferences. Since 1988 35 Phd students graduated under his supervision.
Professor Garik Markarian
Chair in Communications Department of Communications Systems, InfoLab21, South Drive, Lancaster University,
Lancaster.
LA1 4WA
external: +44 1524 510394 Fax: +44 1524 510493 Email: g.markarian@lancaster.ac.uk
Title : Novel Pre-Distortion Algorithm for OFDMA
Abstract£º
In this paper we present a novel technique for nonlinearity compensation in WiMAX power amplifiers developed for OFDMA systems. In the main paper we will provide an overview of the latest work in the area and outline the major techniques, currently being used.
WE also will describe a novel technique, which encompases the hybrid approach and results in significantly reduced computational complexity. In the proposed technique, estimation will be done in frequency domain whereas the compensation will be done in the time domain. This can result in the reduction in complexity and we will have the added benefit of control on the output spectrum. We will present simulation results based on Rapp model and outline our vision for future research in the area.
References
[1] H. W. Kang, Y. S. Cho, and D. H. Youn, "On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter." vol. 47, 1999, pp. 522-526.
[2] Y. Ding, Y. Liu, I. Nilkhamhang, and A. Sano, "Adaptive Linearization for Power Amplifier in OFDM Systems," 2006, pp. 751-754.
[3] A. N. D'Andrea, A. N. D'Andrea, V. Lottici, and R. Reggiannini, "An application of amplitude and phase predistortion to OFDM systems
An application of amplitude and phase predistortion to OFDM systems," in Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, 2000, pp. 1417-1421 vol.3.
[4] R. Zayani and R. Bouallegue, "A Neural Network Pre-Distorter for the Compensation of HPA Nonlinearity: Application to Satellite Communications," 2007, pp. 465-469.
[5] K. Kappler, H. A. Kuzma, and J. W. Rector, "A comparison of standard inversion, neural networks and support vector machines," SEG, 2005.
[6] M. C. Chiu, C. H. Zeng, and M. C. Liu, "Predistorter Based on Frequency Domain Estimation for Compensation of Nonlinear Distortion in OFDM Systems." vol. 57, 2008, pp. 882-892.
Biography
Prof.G.Markarian holds a Chair in Communication Systems at the Department of Communication Systems of Lancaster University. He is one of the world leading scientists specializing in the area of wireless broadband communications, in particular in WiMAX and 3G. His research interests include (but not limited to) Communication Systems, Wireless Broadband Communications, Self-configurable wireless sensor networks, forward error correction, Digital TV broadcasting and e-HEALTH.
His reputation as the worlds leading scientist was build during his involvement in the IEEE802.16, WiMAX, ETSI BRAN, ETSI HYPERACCESS, 3GPP, DVB-DSNG, DVB-RCS and DVB-S2 standardization bodies, where he chaired a number of working Groups and initiated the development of a number of International Standards. Recently, he was elected to become the Technical Secretary of the EUROCAE WG-72, the European Standardization body specializing in aviation security.
This reputation was cemented by his publications in National and International Professional Journals (he co-authored over 200 publications, including 4 text books, 39 National and International Patents and great number of papers in International Journals), and by his election to the number of National and International Professional Committees.
Prof.G.Markarian leads large research Group consisting of research assistants, postgraduate students and knowledge transfer project managers. Despite heavy academic and administrative load, Prof. Markarian is deeply involved in research and development, aiming for the implementation of his research ideas into final projects. As a result, he was granted over 40 National and International Patents many of which are implemented in a variety of products
Prior to joining the University he held Senior Executive Positions in the Industry, leading large Projects in the area of Digital TV Broadcasting, Wireless Broadband Communications and Turbo Codes ASIC design.
He successfully applies his industrial experience and contacts into his research at the University, where in short time he established a sustainable research group with healthy funding stream, exciting projects and enthusiastic young researchers.
Professor Izzat Darwazeh
Email address: i.darwazeh@ee.ucl.ac.uk
Title : A new look at FDM; operating below the orthogonality limit
Abstract£º
For high data rate applications and good performance in frequency selective channels, OFDM is now well established as the key solution and is widely used in various wireless systems ranging from WiFi and WiMax to digital video DVB and ADSL. The basic principle is to transmit the data over a number of narrow band orthogonal subcarriers. Reducing the spacing between subcarriers has the obvious advantage of improved bandwidth efficiency, but results in loss of the orthogonality between subcarriers, which ought to be maintained for signal recovery at the receiver. A variation of OFDM named as Fast-OFDM [1], also referred to M-ary amplitude shift keying (MASK) [2], applies this idea, which reduces the frequency separation between subcarriers by a half when compared to standard OFDM, hence achieving twice the bandwidth efficiency. The limitation of this scheme is that its detection becomes problematic when bandwidth efficient complex modulation schemes, such as QPSK and QAM, are used. In this paper, the basic principle of fast OFDM and other non-orthogonal FDM schemes will be outlined and the generation of such signals, using IFFT and Fractional IFFT (FrIFFT) will be discussed. In addition, the efficacy of different decoding techniques of the received signal (with high inter-carrier interference, will be discussed with results showing achievable error rates using MMSE, ML and Sphere Decoding techniques. A related new multi-carrier and bandwidth efficient technique developed recently at University College London and termed "Orthogonal Basis Division Multiplexing - OBDM" will also be described.
[1] M. R. D. Rodrigues and I. Darwazeh, "Fast OFDM: A Proposal For Doubling the Data Rate of OFDM Schemes," in Proceedings of the International Conference on Telecommunications, 3 ed Beijing, China, 2003, pp. 484-487.
[2] X. Fuqin, "M-ary amplitude shift keying OFDM system," Communications, IEEE Transactions on, vol. 51, no. 10, pp. 1638-1642, 2003.
Biograph
Professor Izzat Darwazeh holds the University of London Chair of Communications Engineering in the Department of Electronic and Electrical at UCL. He obtained his first degree in Electrical Engineering from the University of Jordan in 1984 and the MSc and PhD degrees, from the University of Manchester Institute of Science and Technology (UMIST), in 1986 and 1991, respectively. He worked as a research Fellow at the University of Wales - Bangor -UK from 1990 till 1993, researching very high speed optical systems and circuits. He was a Senior Lecturer in Optoelectronic Circuits and Systems in the Department at Electrical Engineering and Electronics at UMIST. He moved to UCL in October 2001 where he is currently the Head of Communications and Information System (CIS) group and the Director of UCL Telecommunications for Industry Programme. He is a Fellow of the IET and a Senior Member of the IEEE. His teaching covers aspects of wireless and optical fibre communications, telecommunication networks and high speed integrated circuits and MMICs. He lectures widely in the UK and overseas. His research interests are mainly in the areas of wireless system design and implementation, high speed optical communication systems and networks, microwave circuits and MMICs for optical fibre applications and in mobile and wireless communication circuits and systems. He has authored/co-authored more than 120 research papers. He has co-authored (with Luis Moura) a book on Linear Circuit Analysis and Modelling (Elsevier 2005) and is the co-editor of the IEE book on Analogue Optical Communications (IEE 1995). He collaborates with various telecommunications and electronic industries in the UK and overseas and has acted as a consultant to various academic, industrial, financial, legal and government organisations.
Prof. Sajal K. Das
Editor-in-Chief, Pervasive and Mobile Computing (PMC)
Director, CReWMaN (http://crewman.uta.edu)
University Distinguished Scholar Professor
Department of Computer Science and Engineering
The University of Texas at Arlington
E-mail: das@uta.edu, Tel: (817) 272-7405
http://www.cse.uta.edu/~das
Title: Smart Environments: Challenges, Solutions and Future Directions
Abstract: to be added
Biography: to be added
Professor Jianhua LU
Vice chair, Academic Committee of Electronic Engineering.
Department of Electronic Engineering,
TSINGHUA UNIVERSITY,
100084, China
E-mail: lujh@wmc.ee.tsinghua.edu.cn
Title£ºFundamental Research on Multi-Domain Collaboration for Broadband Wireless Communications
Abstract£º
As the high-tech pillar industries of almost every country, wireless communications have been maintained a rapid development. However, due to the limitation of radio resource, the existing and upcoming systems may not satisfactorily resolve the contradiction between the limited spectrum resources and the rapid growth in demand, resulting in serious bottleneck in wireless communications. The key of solving the bottleneck problem is to fundamentally improve the effectiveness of radio resource usage, that is, to maximize spectrum efficiency and resource sharing capacity, while meeting the quality of service requirement.
In this talk, aiming at China long-term plan of broadband wireless technologies and applications, a multi-domain collaborative communication theory and framework with collaboratively utilizing space, frequency, time, signal, power, terminals and network resource is introduced. Compared with the traditional framework of the wireless communication systems based mainly on independent resource optimization and simple schedule model, the new framework may fundamentally make a breakthrough in spectrum usage method and resource sharing optimization. Specifically, the ways of increasing spectrum efficiency and the fundamental technologies in improving transmission rate, spectrum efficiency, power efficiency, system capacity, ability to support heterogeneous systems are explored and analyzed, while some efficient methods are proposed to meet the demand of high Quality of Service (QoS) in future broadband wireless communication systems.
Biography£º
Jianhua LU received the B.S.E.E. and M.S.E.E. degrees from Tsinghua University, Beijing, China, in 1986 and 1989, respectively, and Ph.D in Electrical & Electronic Engineering from the Hong Kong University of Science & Technology. Since 1989, he has been with the Dept. of Electronic Engineering, Tsinghua Univ. Beijing, China, where he now serves as a full professor. He is a member of Expert Group for National High-Tech R&D Program (863), Chief Scientist in National Basic Research Program (973), and Principal Investigators for the key projects of NSFC. Dr. Lu has been an active member of professional societies and has published more than 100 technical papers in international journals and conference proceedings. He received the best papers awards in ICCCAS2002 and Chinacom2006, and National Distinguished Young Scholar Fund from NSFC in 2006. He has served in many IEEE Conferences as member of the Technical Program Committee, and was the lead chair of General Symposium of ICC2008. His current research interests include broadband wireless communication, multimedia signal processing, satellite communication, and wireless networking.
Dr. Lu is a senior member of IEEE Communication Society and Signal Processing Society.
Professor Zhang Ping
Beijing University of Post and Communications
Title£º4G Activities in China
Abstract£º
Now, Enhanced 3G, such as 3GPP LTE and 3GPP2 UMB are doing standard for 100Mbps peak data rate. And ITU also launches IMT Advanced work for 4G with higher requirements. 1Gbps is the target for IMT Advanced system. And WRC 2007 also allocated the spectrum for IMT Advanced. 4G is coming.
China launched FuTURE 4G trial system and trial network research and development since 2001. Beijing University of Posts and Telecommunications (BUPT) take charge for the FuTURE TDD branch. The FuTURE 4G TDD trial system support distributed architecture with MIMO and OFDM techniques. The peak data rate is beyond 100Mbps. The indoor and outdoor scenarios are tested in the trial network and versatile services are support, including HDTV, FTP download, VoIP etc.
In 2007, a lot of activities and workshops for 4G were held in China. Many state projects were set up for 4G research and several inter-governmental cooperation projects were set up for 4G and beyond system research, such as Sino-Sweden, Sino-Japan, Sino-Korea etc.
Biography
Zhang Ping is a famous expert in the wireless communications field, the professor of Beijing University of Posts and Telecommunications (BUPT), the director of Wireless technology innovation Institute (WTI), BUPT, the director of Key Lab of Universal Wireless Communications, Ministry of Education (BUPT), as well as the vice director of JSI (Sino-German Joint Software Institute). Prof. Zhang Ping is one of the three draftsmen of National Key Program, member of Experts and Consultants Committee of NSFC, member of Experts and Consultants Committee of 3G Mobile Technology Tests of MII and vice group leader of Technological Expert Group of TD-SCDMA Industrial League, member of total group in FuTURE Project of 863, vice president of China FuTURE Forum and vice president of WWRF Vision Committee,
Professor YUAN Dongfeng
to be added
Professor ZHANG Hongke
Beijing Jiaotong University
Topic£ºThe Present and Future of Mobile Internet Technology
Abstract:
With the increasing requirements of wireless access, mobile network access and relative mobility of mobile entities, "Mobile Internet" has become an important direction of Internet development.
The original design of current information network is basically that one kind of network mainly supports only one kind of service. For example, telecom network is designed for voice service, and Internet is designed for data service. With the development of Mobile Internet, the original design of network can't meet the multiple requirements for mobile Internet access and services. So network architecture should be redesigned urgently based on new network concept and protocols. Furthermore, the connection method of traditional Internet is mainly "fixed and wired", lacking of the support on mobility in aspects of route, multicast and management. It is obvious that the traditional Internet can't satisfy the requirements of Mobile Internet. Therefore, it is in dire need of breaking through the original design idea of traditional Internet and starting the research on the architecture, theory and key technologies for the next generation of Mobile Internet. So main countries have started some projects such as FIND to study the Mobile Internet. And some technologies such as MIPv4 (Mobility IPv4), MIPv6 (Mobility IPv6), NEMO (Network Mobility) have been proposed. They can supply basic mobility support for single node or subnets. But these technologies can't solve the main issues in Mobile Internet, such as security issue, location and identity privacy issue, handoff issue, and so on. In order to solve these issues, the architecture of Internet or the information network must be redesigned.
We have studied the main issues in Mobile Internet, and give the new architecture of next generation Mobile Internet. First, we have proposed a two-layer model for Mobile Internet. According to research on theories of layer division of current various information networks, we find that the structure of every network can be divided into two basic layers, one is service layer and the other is network layer. Therefore we propose a new two-layer architecture model£¬that is "service layer" and "switching and routing layer". On "switching and routing layer", we conclude that the routing principles of various networks are similar. They fulfill data exchanging and forwarding and have only few differences in data formats and services supported. So we propose generalized switching and routing theory, separating and mapping of access identifier, which is the core of universal network model and theory, aiming to solve the integrated problem of various networks. On "service layer", we find that the principles of various networks are similar£ºall services£¨businesses£© set up link first, then the link selects routes based on the switching and routing principle£¬and realize data transportation. Based on this similar principle, we propose the parsing and mapping theory between "service identifier" and "connection identifier", which is the core of pervasive service model and theory, addressing the pervasive service issue.
Biograpgy:
Zhang Hongke was born in September of 1957. He got the M.S. and Ph.D. degrees in Electrical and Communication Systems from the University of Electronic Science and Technology of China in 1988 and 1992, respectively. From Sep. 1992 to June 1994, he was a post-doctor researcher at Beijing Jiaotong University (formerly known as Northern Jiaotong University). In July 1994, he took part in the School of Electronics and Information Engineering, Beijing Jiaotong University, where he is now a professor. He is also the dean of the School of Electronics and Information Engineering and the director of the Next Generation Internet Research Center. He has published more than 100 research papers in the areas of communications, computer networks and information theory. He is now the chief scientist of the projects "A Universal Network Architecture for Supporting Pervasive Services" founded by the National Basic Research Program of China ("973 Program"). He serves as member of some national committees such as the Electronics and Information Science Steering Committee of the Ministry of Education, the Expert Committee of the National Natural Science Foundation of China (NSFC), and the Expert Committee of the Ministry of Information Industry.