T1. Turbo Codes: Analysis, Design, Iterative
Decoding and Applications
Time: Sunday All Day - 11 May 2003 (8:30-17:00)
Instructor: Sergio Benedetto, Politecnico di Torino
Abstract:
Turbo-like codes are concatenated codes (in parallel or serially) formed
by two simple convolutional encoders separated by an interleaver. They
have astonishing performance close to the Shannon limits, yet enable
simple decoding with complexity comparable to that of decoding the simple
constituent codes. After their invention in 1993, the so-called "turbo
principle" has been applied to such fields as equalization, multiuser
detection, and synchronization. This tutorial provides an understanding
of the principles governing the codes behavior, analytical tools to
evaluate performance, design rules for both the constituent codes and
the interleaver, explanation of the maximum-a-posterior algorithms which
form the core of the iterative decoding algorithms, extensive analytical
and simulation results, a comparative analysis of the implementation
complexity, and a number of important applications like third-generation
wireless communications, digital video broadcasting and deep-space communications.
T2.
Space-Time Coding
Time: Sunday Morning - 11 May 2003 (8:30-12:00)
Instructor: Hamid Jafarkhani, University of California at Irvine
Abstract:
We present space-time coding to achieve diversity using multiple antennas
in a wireless environment. We discuss the outage capacity of multiple
antenna wireless systems to show the huge potential increase in the
capacity. To approach these capacity limits we propose space-time codes.
After discussing the design criteria, we introduce orthogonal space-time
block codes, space-time trellis codes, super-orthogonal space-time trellis
codes, and quasi-orthogonal space-time block codes. In each case, we
describe the details of code design, complexity, and performance. Then
we discuss differential detection schemes for transmission using multiple
antennas assuming that neither the transmitter nor the receiver knows
the channel. Finally, we discuss combination of space-time coding with
other signal processing methods, i.e., combined array processing and
space-time coding.
T3.
Introduction to Network Security
Time: Sunday Morning - 11 May 2003 (8:30 -12:00)
Instructor: Guenter Schaefer, Technical University of Berlin
Abstract:
The need for network security nowadays does not need verbose motivations
given the increasing dependence of modern information society from communication
networks. This tutorial will give a general introduction to the field
of network security, covering threats, countermeasures, as well as design
principles and practical examples of how to integrate security services
into layered communications architectures. Example network security
architectures and protocols covered in the tutorial are: IEEE 802.1x,
PPP, PPTP, L2TP, VPN, IPSec, SSL/TLS, SSH, and Internet Firewalls. The
audience for this tutorial will get an in-depth introduction to network
security threats and protocols and a good understanding of the fact
that network security is more than the encrypted and signed exchange
of data: it is an emerging engineering discipline.
T4.
Orthogonal Frequency-Division Multiplexing for Wireless
Time: Sunday Afternoon - 11 May 2003 (13:30-17:00)
Instructors: Leonard Cimini, Jr., University of Delaware; Ye (Geoffrey)
Li, Georgia Institute of Technology
Abstract:
Orthogonal frequency-division multiplexing (OFDM) has been shown to
be an effective technique to combat multi-path fading in wireless communications.
This approach has been chosen as the standards in several outdoor and
indoor high-speed wireless data applications. This tutorial initially
presents the basic principles of OFDM. Then we discuss the problems
and some of the potential solutions to the practical issues in implementing
such a system. These include techniques for peak-to-average power ratio
reduction, time and frequency synchronization, channel estimation, adaptive
antenna arrays and transmitter diversity. We conclude with a discussion
of current and proposed systems..
T5.
Open Mobile Services
Time: Sunday Afternoon - 11 May 2003 (1:30 - 5:00)
Instructors: Do van Thanh, Telenor/Norwegian University of Science
and Technology; Hemant Chaskar, Nokia
Abstract:
This tutorial provides an overview of the emerging technology enables
for the future mobile services architectures focusing on open service
creation, deployment, provision and management in heterogeneous mobile
environments. The future mobile services would include traditional services
such as telephony, as well as multimedia services such as videophone,
WWW, messaging etc. The mobile users may use services offered by different
operators and also third parties from multiple terminals and over a
variety of access networks. It is crucial to meet the users' demand
of service diversity, personalization and context awareness. This tutorial
will provide an overview of technologies such as SIP, 3G IMS, Parlay
and OSA, OMA, VHE, MExE, WAP, SIM Application Toolkit, Liberty Alliance,
etc.
T6.
Evolution of UMTS Core Networks: 3G and Beyond
Time: Sunday Afternoon - 11 May 2003 (1:30 - 5:00)
Instructors: Vijay Varma, K.Daniel Wong, Telcordia Technologies,
Inc.
Abstract:
This tutorial discusses the evolution of core network from GSM to UMTS
and beyond, with emphasis on packet domain, the IP Multimedia (IM) Core
Network (CN) subsystem, and UMTS/WLAN integration. The evolution of
the core network will be explained from the perspective of the move
towards supporting IP Multimedia Services. Topics covered include GPRS
overview, the evolution of the core network to "All-IP" and
the resulting network architectures, the IM CN subsystem concepts and
procedures, the role of Internet Telephony protocols for multi-media
session set up, the UMTS service environment, recent developments in
3GPP Release 6, WLAN as a potential platform for 4G wireless, evolution
of UMTS towards fourth generation wireless, and UMTS/WLAN integration.
Selected call flows will be used to illustrate key concepts.