|
T-1.
Smart Antennas for Wireless Communications
In this tutorial, we will discuss
current and future wireless systems, with emphasis on antenna technology
and the improvement that smart and adaptive antenna arrays can provide.
We will first discuss cellular systems, and describe standard
cellular antennas, smart antennas using fixed beams, and adaptive antennas
for base stations, as well as antenna technologies for handsets.
We will show the potential improvement that these antennas can
provide, including range extension, multipath diversity, interference
suppression, and capacity increase. We will describe in detail.
Multiple-Input-Multiple-Output (MIMO) techniques, whereby multiple
antennas are used both at the receiver and transmitter. We will show how
these MIMO techniques are of great importance due to the fact that they
have the potential, with M transmit and receive antennas, to increase the
data rate M-fold without any increase in bandwidth or total transmit
power.
The
issues involved in incorporating these antennas into wireless systems,
including 2nd generation (CDMA, GSM, and IS-136), 3rd generation (WCDMA
and EDGE), and future (OFDM?) cellular systems, in different environments,
such as rural, suburban, and urban areas, as well as indoors, will be
described in detail. We will describe the evolution to high-speed data
mobile wireless systems, with data rates in excess of 10 Mbps. We also
describe the extension of wireless local area networks using 802.11b and
802.11a, and cellular systems (WCDMA), to provide high-speed ubiquitous
access. Smart antennas are shown as a key technology to provide the needed
enhancements of range extension, interference suppression, and capacity
increase. Theoretical, computer simulation, experimental, and field trial
results will be presented. This tutorial should provide a basic
understanding of the antenna technology options and their potential in
wireless systems.
 Jack H. Winters (jwinters185170@comcast.net)
received his Ph.D. in Electrical Engineering from The Ohio State
University in 1981 and was then with AT&T in the research area for
more than 20 years. At AT&T, he was Division Manager of the Wireless
Systems Research Division of AT&T Labs-Research. Currently, he is
consulting for several wireless and optical communication companies. He is
a Fellow of the IEEE, an IEEE Distinguished Lecturer for both the IEEE
Communications and the Vehicular Technology Societies, Area Editor for
Transmission Systems for the IEEE Transactions on Communications, and New
Jersey Inventor of the Year for 2001. His research interests include
signal processing techniques, such as smart antennas, for increasing the
capacity and performance of wireless local area networks and cellular
systems.
T-2.
Wireless IP
The IP protocol stack can be considered as the general framework in
which networks and applications will develop all their potential in the
next future. This fact that
is already a reality for wired networks, it is expected to be extended to
the wireless environment. It is in this context that the tutorial aims to
present the most important aspects related to an all wireless/mobile IP
deployment. So, after a fast review of the main TCP-UDP/IP
characteristics, the behavior of the transport protocols over wireless
links will be presented and justified. Different techniques designed to
cope with wireless link impairments like Performance Enhancing Proxies
(PEP) and protocol boosters will be presented. Finally, a possible future
scenario based on cooperation between 3G networks and WLAN/WPAN
infrastructures will be discussed.
 Ramjee
Prasad (prasad@cpk.auc.dk)
was born in Babhnaur (Gaya), India, on July 1, 1946. He is now a
Dutch citizen. He received his B.Sc. (eng.) from the Bihar Institute of
Technology, Sindri, India, and his M. Sc. (eng.) and Ph. D. from Birla
Institute of Technology (BIT), Ranchi, India, in 1968, 1970, and 1979,
respectively.
He joined BIT as a senior research fellow in 1970 and became an associate
professor in 1980. While he was with BIT, he supervised a number of
research projects in the area of microwave and plasma engineering. From
1983 to 1988, he was with the University of Dar es Salaam (UDSM),
Tanzania, where he became a professor of telecommunications in the
Department of Electrical Engineering in 1986. At UDSM, he was responsible
for the collaborative project Satellite Communications for Rural Zones
with Eindhoven University of Technology, The Netherlands. From February
1988 through May 1999, he was with the Telecommunications and Traffic
Control Systems Group at DUT, where he was actively involved in the area
of wireless personal and multimedia communications (WPMC). He was the
founding head and program director of the Center for Wireless and Personal
Communications (CEWPC) of International Research Center for
Telecommunications – Transmission and Radar (IRCTR). Since June 1999,
Dr. Prasad has been with Aalborg University, as the codirector of the
Center for Person Kommunikation (CPK), and holds the chair of wireless
information and multimedia communications. He was involved in the European
ACTS project FRAMES (Future Radio Wideband Multiple Access Systems) as a
DUT project leader. He is a project leader of several international,
industrially funded projects. He has published over 300 technical papers,
contributed to several books, and has authored, coauthored, and edited ten
books: CDMA for Wireless Personal Communications, Universal Wireless
Personal Communications, Wideband CDMA for Third Generation Mobile
Communications, OFDM for Wireless Multimedia Communications, Third
Generation Mobile Communication Systems, WCDMA: Towards IP Mobility and
Mobile Internet, Towards a Global 3G System: Advanced Mobile
Communications in Europe, Volumes 1 & 2, IP/ATM Mobile Satellite
Networks, and Simulation and Software Radio for Mobile
Communications, all published by Artech House. His current research
interests lie in Wireless networks, packet communications, multiple-access
protocols, advanced radio techniques, and multimedia communications.
Dr. Prasad has served as a member of the advisory and program committees
of several IEEE international conferences. He has also presented keynote
speeches, and delivered papers and tutorials on WPMC at various
universities, technical institutions, and IEEE conferences. He was also a
member of the European cooperation in the scientific and technical
research (COST-231) project dealing with the evolution of land mobile
radio (including personal) communications as an expert for The
Netherlands, and he was a member of the COST-259 project. He was the
founder and chairman of the IEEE Vehicular Technology/Communications
Society Joint Chapter, Benelux Section, and is now the honorary chairman.
In addition, Dr. Prasad is the founder of the IEEE Symposium on
Communications and Vehicular Technology (SCVT) in the Benelux, and he was
the symposium chairman of SCVT’93.
In addition, Dr. Prasad is the coordinating editor and editor-in-chief of
the Kluwer International Journal on Wireless Personal Communications
and a member of the editorial board of other international journals,
including the IEEE Communications Magazine and IEE Electronics
Communication Engineering Journal. He was the technical program
chairman of the PIMRC’94 International Symposium held in The Hague, The
Netherlands, from September 19-23, 1994 and also of the Third
Communication Theory Mini-Conference in Conjunction with GLOBECOM’94,
held in San Francisco, California, from November 27-30, 1994. He was the
conference chairman of the fiftieth IEEE Vehicular Technology Conference
and the steering committee chairman of the second International Symposium
WPMC, both held in Amsterdam, The Netherlands, from September 19-23, 1999.
He was the general chairman of WPMC’01 which was held in Aalborg,
Denmark, from September 9-12, 2001.
Dr. Prasad is also the founding chairman of the European Center of
Excellence in Telecommunications, known as HERMES. He is a fellow of IEE,
a fellow of IETE, a senior member of IEEE, a member of The Netherlands
Electronics and Radio Society (NERG), and a member of IDA (Engineering
Society in Denmark).
 Luis Muńoz (luis@tlmat.unican.es)
is associate professor at the University of Cantabria. He received a
degree in telecommunications engineering and a Ph.D. degree from the
Technical University of Catalu¤a (UPC), Spain in 1990 and 1995,
respectively. He joined the Communications Engineering Department in 1990
where he has been involved in different national and international
projects, the latter within the ACTS and IST programs, related to voice
and data transmission over wired and wireless infrastructures. His current
research interests lie in the design and implementation of ad hoc routing
and link layer control mechanisms for wireless Internet infrastructures,
medium access protocols and channel coding.
T-3. Joint Physical and Network Layer Optimisation
of Wireless Systems
This overview is based on the Wiley/IEEE Press monographs "Blogh,
Hanzo: Third-Generation Systems and Intelligent Wireless Networking: Smart
Antennas and Adaptive Modulation"; "L. Hanzo, et al.: Adaptive
Wireless Transceivers: Turbo-Coded, Turbo-Equalised and Space-Time Coded
TDMA, CDMA and OFDM systems"; "L.
Hanzo, et al.: Turbo Coding, Turbo Equalisation and Space-Time
Coding" (for sample chapters and full contents please refer to http://www-mobile.ecs.soton.ac.uk).
The short course provides an insight into the effects of turbo- coded,
turbo-equalised and space-time coded adaptive TDMA, CDMA and OFDM
transceivers as well as smart antennas and a range of other efficient
networking techniques on the achievable teletraffic capacity of adaptive
wireless systems. This
research-oriented presentation considers the joint benefits of both
adaptive physical and adaptive network- layer performance enhancement
techniques. More specifically, conventional systems would drop a call in
progress, if the communications quality falls below the target quality of
service and it cannot be improved by handing over to another physical
channel. By contrast, the
adaptive transceivers of the near future are expected to simply
'instantaneously drop the throughput, rather than dropping the call' by
reconfiguring themselves in a more robust mode of operation. It is
demonstrated that the proposed beam-forming and adaptive transmission
techniques may double the expected teletraffic capacity of the system,
whilst maintaining the same AVERAGE performance as their conventional
fixed-mode counterparts. Whilst
this overview is ambitious in terms of providing a research-oriented
outlook, potential attendees require only a modest background in wireless
communications. Network operators, service providers, managers and
researchers embarking on the joint optimisation of the physical and
network layer may find the coverage of the presentation beneficial. The
participants will receive a number of book chapters and a set of slides as
supporting material.
 Lajos Hanzo (lh@ecs.soton.ac.uk)
is the lecture of this course. During his 26-year carreer he has
held various academic and research positions in Hungary, Germany and the
UK. Since 1986 he has been with the University of Southampton, where he
holds the Chair of Telecommunications.
Over the years he has co-authored eight books on mobile radio
communications, published about 400 research papers and has been awarded a
number of distinctions. He is
an IEEE Distinguished Lecturer. For
further information on research in progress and for associated papers and
book chapters please refer to http://www-mobile.ecs.soton.ac.uk.
T-4.
MIMO Systems
MIMO (Multiple - input - multiple-output) systems have multiple antennas
at both link ends. Recent information-theoretic results have shown the
enormous capacities that can be realized with such systems. Thus, in the
few years since their inception, they have attracted an enormous amount of
interest. Although a lot of effort is still needed for research and
standardization before they can become ubiquitous. This tutorial will
describe the principles and applications of these systems.
We start out with an overview of the two methods for employing MIMO
systems: diversity enhancement, and BLAST-like schemes. In the former
case, the multiple antennas at both link ends are used to provide a high
degree of diversity, resulting in a high-quality link. In the latter case,
independent data streams are sent from the different transmit antennas,
and the multiple receive antennas are used to receive and separate those
different data streams. The information-theoretical capacity of MIMO
systems will be explained intuitively.
In both applications, the wireless channel, especially the
directions-of-arrival and directions-of-departure of the waves going from
TX to RX, determines the performance of the MIMO systems. We thus next
investigate those directional properties. Special measurement and signal
processing techniques are required for this purpose. We then describe how
measurement results can be converted into models, and give some results
from recent standardization efforts in COST and 3GPP. The influence of
line-of-sight components and signal correlation on the capacity will be
shown.
Next, we go into the details of combined transmit- and receive diversity,
and explain what diversity degree and beamforming gain can be achieved in
different types of wireless channels. Next, we describe BLAST schemes, and
show how the capacity of these systems can increase linearly with the
number of transmit and receive antennas. Different versions of the BLAST
scheme are described, and their advantages and drawbacks are discussed.
Finally, we describe the principles of space-time codes, and show how
those can be applied for diversity and capacity increase.
We also describe how frequency selectivity influences the capacity, and
what schemes can be used to exploit it. A discussion of
interference-limited MIMO systems, and of waterfilling schemes, will round
off the presentation.
 Andreas F. Molisch
(Andreas.Molisch@ieee.org)
received the Dipl. Ing., Dr. techn. (with highest honors),
and habilitation degrees from the Technical University Vienna in 1990,
1994, and 1999, respectively. From 1991 to 2001, he was with the Institut
für Nachrichtentechnik und Hochfrequenztechnik (INTHFT) of the TU Vienna,
most recently as associate professor. From 2001 to 2002, he was with
AT&T Laboratories - Research; since 2002 he has been with Mitsubishi
Electric Research Laboratory, Murray Hill. He is also professor and
chairholder for Radio Communications at Lund University, Sweden His
current research interests are MIMO systems, UWB, characterization of
mobile radio channels, and wideband systems. He is senior member of the
IEEE, and (co)author of two books, five book chapters, some 50 journal
papers, and numerous conference contributions. He is also chairman of the
COST273 working group on MIMO channels, and active in the 3GPP adhoc group
for this topic.
T-5.
Towards ALL-IP Wireless Multimedia Networks
Mobile communications and data communications are two of the fastest
growing areas in the communication industry. Currently, a huge amount of
information exists on Internet which could be used even more efficiently
if its wireless delivery with appropriate quality and speed would be
possible. Therefore, wireless data communications, which include wireless
or mobile Internet, represents very dynamic area not only for research
community but also for mobile or different wireless operators. It is clear
that circuit switching function in 2G (and 2.5G) mobile systems represents
a serious constraint for wireless delivery of Internet
and other advanced multimedia services. Thus, the
third generation mobile systems (IMT-2000, UMTS, iMode) having
packet-switched data channels will enable better mobile access to Internet information or better affordability
of mobile Internet. Also, knowing that deployment of 3G systems is
foreseen as a process having various phases (releases), it could be stated
that the final goal in their development is an all-IP wireless network
supporting efficient delivery of both voice and data traffic. Discussions
on future development of mobile radio systems are currently very hot topic
in communication industry and research community. It is still not clear
what could be considered as a new
fourth generation, or beyond 3G, which might replace 3G and 2G systems.
Anyway, at this point a scenario of multi-segment wireless access networks
integrated into an IP core network and exploiting the principles of Mobile
IP is predominant. The air radio interface, or physical layer, is one of
the most important elements when future development of mobile systems is
considered. Its main building blocks are:
modulation, coding, equalization, diversity and multiple access
techniques. Since they determine the capacity and the implementation
complexity of the systems, this tutorial is focused on description of
these blocks as well as on their evolution and future development. First,
mobile radio channel is described and then the main building blocks of the
mobile radio system physical layer. Main modulation techniques used in
wireless systems are briefly discussed: GMSK, QPSK, DQPSK, QAM, and OFDM.
Apart from that, coding techniques are presented including the
concept of trellis codes and space-time codes interesting from the point
of 3G mobile systems. Diversity techniques represent important part of air
radio interfaces and antenna diversity systems, frequency and polarization
diversity schemes are described. Transmit diversity as well as MIMO
systems are receiving increased interest for future systems. Therefore,
the tutorial includes their description.
Multiple access techniques are used for efficient spectrum utilization.
Various approaches are already in use, like FDMA, TDMA and CDMA. Apart
from W-CDMA (FDD) and TD/CDMA (TDD), this tutorial is focused on DS-CDMA,
MC-CDMA and OFDM presentation. Possibilities of some hybrid solutions are
also discussed. At the end, the air radio interface of the mobile radio
systems already standardized is presented. GSM, GPRS, EDGE, cdma2000, UMTS
and IMT-2000 solutions for the air radio interface are described. Then,
the further development of the existing solutions towards future 4G all-IP
wireless networks is discussed. The main open issues as well as research
challenges are identified. Then, two main development trends: W-CDMA
evolution and completely new air radio interface solution are discussed
and compared.
 Milica Pejanovic (milica@cg.ac.yu)
is full professor at the University of Montenegro, Faculty of Electrical
Engineering, Podgorica. Mrs. Pejanovic graduated in 1982. at University of
Montenegro with BSc degree in Electrical Engineering. She has got MSc and
PhD degrees in Telecommunications at University of Belgrade. Prof.
Pejanovic has also performed research in mobile ommunications at
University of Birmingham, UK for the period 1984-1985. She has been
teaching at University of Montenegro basic telecommunications courses on
graduate and postgraduate levels, as well as courses in mobile
communications and computer communications and networks, being the author
of three books and many strategic studies. At Scuola Superiore di Reiss
Romoli (SSGRR) at l'Aquilla (Italy) she is engaged as a lecturer for a
course on Mobile Internet. She has published more than 100 scientific
papers in international and domestic journals and conference proceedings.
She has been a chairman for several conferences and workshops, giving
tutorials and presenting invited papers at many technical and scientific
conferences (IEEE, VTC, WPMC...).
Her main research interests are:
physical layer of wireless systems, access techniques, wireless
channel modeling and fading mitigation, wireless networks performance
improvement, wireless broadband transmission techniques, optimization of
telecommunication development policy.
Prof. Pejanovic has considerable industry and operating experiences
working as industry consultant (Ericsson, Siemens…) and Telecom
Montenegro Chairman of the Board. Being the project leader, she conducted
several GSM networks design and implementation projects worldwide. At the
moment she is involved in their enhancement and upgrade for the purpose of
wide-band data communications.
Prof. Pejanovic is leading the Government team of experts working on
telecommunications sector restructuring, including the intended Telecom
Montenegro privatization, as well as establishment of an appropriate
regulation infrastructure. Prof. Pejanovic is IEEE Member and she
participates in ITU-D projects concerning telecommunications
infrastructure development and Internet promotion as well as in ITU-R
Working Group for IMT-2000. Also, being an ITU expert, as a speaker and a
lecturer, she is involved in ITU seminars dealing with IMT-2000
issues.
T-6. UMTS/IMT2000
The course will start by an introduction
and background to UMTS/IMT2000. It
will be followed by a description of the overall network architecture.
The technical aspects of UMTS network access (both W-CDMA and TD/CDMA)
and core network will be given. For
WCDMA, the following techniques will be covered:
- RF,
physical, transport and logical channels
- Frame
and time-slot structures
- Spreading,
modulation, channel coding and multiplexing
- Power
control
- Initial
cell search
- Packet
transmission
- Slotted
downlink transmission
- Handover
strategies
- MAC,
RLC and RRC
The following techniques
will be described for TD/CDMA:
- RF,
physical, transport and logical channels
- Frame
and burst structures
- Spreading,
modulation, channel coding and multiplexing
- Power
control
- Handover
strategies
Then,
the planning and optimasation issues for WCDMA networks will be discussed.
Finally, the latest activities within 3GPP and ITU will be
addressed.
 Hamid Aghvami (hamid.aghvami@kcl.ac.uk)
obtained his M.Sc. and Ph.D. degrees from King's College, University of
London, England, in 1978 and 1981, respectively.He is currently professor
in Telecommunications Engineering at King's College and Director of
Research at Department of Electronic and Electrical Engineering, He has
Published over 150 research papers and has lectured on digital radio
communications worldwide.
Dr. Aghvami is a member of the U.K. IEE and Chairman of the Communications
Chapter of UK and RI. He has served on the technical program and
organizing committee of many intermational and European conferences and
founded the International Symposia on PIMRC.
 Mischa Dohler
(mischa@ieee.org) obtained his MSc and PhD degrees in
Telecommunications from King's College, University of London, England,
in 1999 and 2002, respectively and his Master and Diploma in Electrical
Engineering from Dresden University of Technology, Germany, in 2000. He
is currently lecturer at the Centre for Telecommunications Research,
King's College London. Prior to Telecommunications he studied Physics in
Moscow. He won various competitions in Mathematics and Physics and
participated in the 3rd round of the International Physics Olympics for
Germany. He has published various research papers and holds three
patents. He is a member of the U.K. IEE and IEEE and he is the Student
Representative of the United Kingdom and Republic of Ireland IEEE
Section.
|
