Summer Workshop 2009 on Wireless Communications

Tutorials

Location: All tutorials will be held in AUD C.

Program Overview

Tutorial 1: Aspects of Noise Immunity of MIMO Channels with Generalized Fading Statistics

Presenter: Prof. Valeri Kontorovich, Centro de Investigación y de Estudios Avanzados, CINVESTAV, Mexico

Abstract: The course is dedicated to the noise immunity analysis of MIMO channels from the perspective of the influence of the fading statistics on the characteristics of communication systems. The course will address the following topics:

• Fully generic MIMO channel models
• MIMO channel estimations for the generalized Gaussian model
• Noise immunity evaluation; asymptotic case
• Orthogonal design for space-time coding and signal constellations
• Performance of orthogonal space time block coding (OSTBC) over generalized Gaussian MIMO channels
• Autocovariance decoding for differential space-time modulation (DSTM)

Contents of the course

1. Fully generic MIMO channel models

   • General description
   • Orthogonalization principle
   • Main result

2. MIMO channel estimations for generalized Gaussian models

   • Generalized Gaussian model
   • Optimum receiver structure for three possible scenarios
   • 2D rake receiver
   • Multiuser case

3. Noise immunity evaluation; asymptotic case

   • General considerations
   • Asymptotic results
   • Calculation of the influence of multiple-access interference (MAI) in the multiuser case

4. Orthogonal design for space-time coding and signal constellations

   • Basic principles, diversity product
   • Signal constellations: criteria for orthogonal design
   • Concrete recommendations

5. Performance of OSTBC over generalized Gaussian MIMO channels

   • System model and noise immunity
   • Hardening effect
   • Some practical recommendations

6. Autocovariance decoding for differential space-time modulation

   • Basic principles for DTSM
   • Autocovariance algorithm description
   • Discussion and conclusions

Biography:

Valeri Kontorovich received his M. Sc. (1963), Ph. D. (1967) and Full Dr. (1987) degrees from St. Petersburg (Leningrad) University of Telecommunications (St. Pt. UT) named after M. A. Bonch Bruevich.
From 1968 to 1993 he worked for the St. Pt. UT occupying several positions: junior research associate, senior researcher, head of the research lab, full professor and head of department. Since the end of 1993 he is with the Communications Section of the Electrical Engineering Department of CINVESTAV-IPN (Mexico City), where he is full professor.
His research interests include radio communications, electromagnetic compatibility of radio systems, channel modeling, etc. He is author and co-author of more than 200 publications, including 6 books. Prof. Kontorovich is an IEEE Fellow.

Tutorial 2: Propagation Aspects and Performance Analysis of Wireless Communication Systems

Presenter: Assoc. Prof. Neji Youssef, Ecole Superieure des Communications de Tunis, SUP'COM, Tunis, Tunisia

Abstract: The objective of this tutorial is two-fold: the first part deals with the statistical characterization and applications of Hoyt and Beckmann fading models for both fixed-to-mobile and M2M propagation scenarios. In this part also, the performance of wireless communications over Hoyt channels, taking into account the Doppler spread effects, is investigated and analyzed. The second part is devoted to an overview on diversity techniques and a presentation on the statistics of the outage duration of the capacity of multiple-antenna systems.

Tutorial 2A: Statistical properties and applications of the Hoyt and Beckmann fading models

1. Basic concepts on channel modeling and related statistics
2. Statistical characterization of Hoyt and Beckmann channels
3. Applications
4. Envelope correlation properties

Tutorial 2B: Performance analysis of angle modulation schemes over Hoyt fast fading channels

1. Statistical properties of phase and random FM noise
2. Distribution of the phase angle between two Hoyt faded signals plus noise
3. Application to the performance analysis DPSK and FSK modulation schemes
4. Statistics of the double Hoyt fading channel.

Tutorial 2C: Diversity techniques in wireless communications

1. Receive diversity techniques
2. Transmit diversity
3. Signal statistics and performance analysis

Tutorial 2D: On the distribution densities of fade and inter-fade durations of the capacity of multiple-antenna systems

1. The capacity of SISO systems: Rice probability function approach

2. The capacity of multiple-antenna systems:

   1. Asymptotic behavior based solution
   2. Rice probability function based approximation

Biography:

Neji Youssef was born in Tunisia. He received the B.E. degree in Telecommunications from the Ecole Superieure des Communications de Tunis, Tunisia, in 1983, and the D.E.A. degree in Electrical Engineering from the Ecole Nationale d’Ingenieurs de Tunis, Tunisia, in 1986. He received the M.E. and the Ph.D. degrees in Communications Engineering from the University of Electro-Communications, Tokyo, Japan, in 1991 and 1994, respectively. From 1994 to 1996, he was a Research Associate at the University of Electro-Communications, Tokyo. Presently, he is an Associate Professor at the Ecole Superieure des Communications de Tunis, Tunisia. His research interests include noise theory and statistical modelling of multipath fading channels.

Tutorial 3: Network Coding

Presenter: Prof. Dr. Eng. Krzysztof Wesołowski, Chair of Wireless Communications, Poznań University of Technology (PUT), Poznań, Poland

Abstract: Since the first paper published by R. Ahlswede, N. Cai, S.-Y. R. Li and R. W. Yeung "Network information flow", (IEEE Trans. Information Theory, July 2000) network coding has become a hot research topic in the area of fixed and wireless networks. In our short course, we will present principles of network coding and its mathematical description. Further, we will show its potential for improving the throughput of wireless networks. Finally, we will present the idea and basic properties of network coding performed in the physical layer of wireless networks.

Tutorial 3A: Introduction to network coding

1. Basic idea of network coding and its definitions
2. Basic features of network coding
3. Useful elements of graph theory
4. Finite fields and their properties

Tutorial 3B: Classical network coding

1. Notation used in network coding description
2. Matrix representation
3. Centralized and random network coding
4. Local and global coding vectors

Tutorial 3C: Network coding in wireless networks

1. Network coding in information exchange wireless networks
2. Example of a typical network coding in wireless networks
3. COPE - example of network coding protocol
4. Applicability of network coding in WiMAX

Tutorial 3D: Physical layer network coding

1. Idea of physical layer network coding (PNC) in wireless networks
2. Basic description of physical layer network coding
3. Performance of the wireless network with PNC
4. Capacity of wireless networks with PNC

Biography:

Krzysztof Wesołowski graduated in Electrical Engineering and Mathematics ( cum Laude) in 1976 and 1977 from the Poznań University of Technology (PUT) and Adam Mickiewicz University, Poznań, respectively. In 1982 he received a Ph.D. degree, in 1989 he received the Doctor Habilitus degree, both from PUT. Since 1999 he has been a full professor in the Institute of Electronics and Telecommunications at Poznań University of Technology.

Currently he is the Head of Chair of Wireless Communications at the Faculty of Electronics and Telecommunications, Poznań University of Technology. During his career he was on sabbatical leaves as a Postdoctoral Fulbright Scholar at Northeastern University, Boston and as an Alexander von Humboldt Scholar at the University of Kaiserslautern.

Prof. Krzysztof Wesołowski has published over 100 papers in journals and conference proceedings in Polish, English and German mostly on digital communication systems and signal processing. His main research interests include: digital communication systems, in particular wireless communications, adaptive receivers combating intersymbol interference (linear, decision feedback and maximum likelihood), digital filters for data transmission, error correction codes and information theory. He leads the research team, which participates in a few IST EU projects. Currently Prof. Wesołowski is a leader of the PUT team participating in the WINNER project on future radio access system and the Network of Excellence NEWCOM. In the past Prof. Wesołowski also participated in the works of the COST projects No. 231 and 229. He is the author of the book entitled Mobile Communication Systems (449 pages) published in 2002 by John Wiley & Sons. His book is an extended and updated translation of its Polish edition used as a main handbook for lectures in mobile communications in Poland. It has recently been translated into Russian language. Prof. Wesołowski is also the contributor to the 6-volume Wiley Encyclopedia of Telecommunications and Signal Processing edited by John G. Proakis, published in January 2003. He is also the author of the academic textbook entitled “Introduction to Digital Communication Systems” published so far in Polish.

Professor Wesołowski gives courses on digital communication systems, information theory, coding theory, data transmission, mobile communications and signal theory.

Professor Wesołowski is the member of IEEE and the Association of Polish Electrical Engineers (SEP).

Tutorial 4: Selected Topics in Wireless Communications

Presenter: Assoc. Prof. Corneliu E. D. Sterian, University POLITEHNICA of Bucharest, Romania

Abstract: Due to the great interest of users for mobility, the bulk of the research and development activity in communications domain is performed in the wireless part of it. In this short course, we address three topics that, while perhaps not the hottest ones nowadays, certainly deserve attention. In the first two lessons, we present a methodology for designing super-orthogonal and super quasi-orthogonal space-time trellis codes as used to improve the reliability of mobile digital links by employing multiple transmit antennas. In the third lesson, we provide an easy introduction in the problem of searching for the closest point in a lattice and give an overview of recent results. In the fourth and final lesson, we make an attempt to summarize the recent contributions of information theory to the study of wireless ad hoc networks. Our short course is also meant as an incentive for younger researchers to pay heed to the topics addressed here.

Tutorial 4A: Methodology of designing super-orthogonal and super quasi-orthogonal space-time trellis codes for mobile communications (Part I)

1. Introduction
2. Designing trellis coded modulation schemes with feed-forward convolutional encoders
3. Designing trellis coded modulation schemes with feedback convolutional encoders

Tutorial 4B: Methodology of designing super-orthogonal and super quasi-orthogonal space-time trellis codes for mobile communications (Part II)

1. Designing super-orthogonal space-time trellis codes
2. Designing super quasi-orthogonal space-time trellis codes
3. Receiver issues
4. Conclusions

Tutorial 4C: Finding the closest point in a random lattice: a short introduction

1. Introduction
2. Sphere decoding principle
3. Sphere decoding algorithm
4. Other issues

Tutorial 4D: Information-theoretic considerations on wireless ad hoc networks

1. Introduction
2. The Gupta-Kumar theory
3. The Xie-Kumar theory
4. The Kulkarni-Viswanath theory
5. The percolation theory comes to rescue
6. Recent developments and prospectives

Biography:

Corneliu Eugen D. Sterian was born in Bucharest, Romania, on April 30, 1947. He received the Dipl.-Ing. and Dr.-Ing. degrees in electronics and telecommunications engineering from the University POLITEHNICA of Bucharest.

He is currently Associate Professor with the University POLITEHNICA of Bucharest where he is teaching Information and Coding Theory, Communication Systems, and related matters. During the second half of the year 2000, he was the telecommunications engineer of UNMIK, Pristina, Kosovo. From the middle of 1997 to the end of 1998, he was Director General in the Ministry of Communications of his country. After the Ministry was replaced by the National Agency for Communications and Information Technology, he served as Head of Department and then Director.

From 1992 to 1997, he was with ROMTELECOM, the national telecommunications operator of Romania. From 1974 to 1992, he was with I.P.A. research institute, where he was promoted in 1991 to the highest degree of principal scientist. His research interests include information theory and more particularly channel coding.

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