ISWCS’08 Tutorials

Program Schedule

Tuesday, October 21st
Time	Princeton I	Princeton II
9:00 – 10:30	Tutorial 1 - Wireless Mesh Networking	Tutorial 2 - Recent advances in PAPR reduction methods for multicarrier signals
Coffee break
10:45 – 12:00	Tutorial 1 - Wireless Mesh Networking	Tutorial 2 - Recent advances in PAPR reduction methods for multicarrier signals
Lunch
13:00 – 14:30	Tutorial 3 - Multiuser MIMO in Wireless Communications Systems – From Theory to Practice	Tutorial 4 – 7Layers - Regulatory Issues
Coffee break
14:45 – 16:00	Tutorial 3 - Multiuser MIMO in Wireless Communications Systems – From Theory to Practice	Tutorial 4 – 7Layers - Regulatory Issues

Tutorial 1 - Wireless Mesh Networking

Dr. Prasant Mohapatra - University of California, Davis

Prasant Mohapatra received his Ph.D. in computer engineering from the Pennsylvania State University in 1993. He was an assistant professor and then an associate professor at Iowa State University from 1993 to 1999, and then at Michigan State University till 2001. Since then he has been at University of California, Davis, where he is currently a Professor in the Department of Computer Science. Professor Mohapatra has delivered talks at several industries such as Intel, HP, Panasonic, SIEMENS, Nokia, etc. He has given short courses and tutorials at many academic organizations in USA, Canada, Italy, India, Australia, Portugal, Singapore, Hong Kong, and Thailand. Dr. Mohapatra has published extensively in various international journals and conferences. He has been an invited speaker at several universities and other organizations in several countries. He has given several tutorials in various international venues, and has taught several advanced courses in computer networks, wireless networks, performance evaluation, and multimedia systems. His research work has been funded and collaborated by National Science Foundation, SIEMENS, EMC Corporation, Panasonic Technologies, Hewlett Packard, Rockwell International, and Intel Corporation. He was/is on the editorial board of the IEEE Transactions on Mobile Computing, IEEE Transactions on Computers, ACM WINET, and Ad Hoc Networks. He has been on the program/organizational committees of several international conferences. He was the Program Vice-Chair of INFOCOM 2004 and MASS 2004, and the Program Co-Chair of the First IEEE International Conference on Sensor and Ad Hoc Communications and Networks (SECON 2004). He is also the Co-Chair of the First IEEE Workshop on Wireless Mesh (WiMesh 2005). He has been a Guest Editor for IEEE Network, IEEE Transactions on Mobile Computing, and the IEEE Computer.

Tutorial summary Wireless mesh networks are multihop networks of wireless router platforms. The wireless routers are typically stationary, but the clients can be mobile. A mesh network can provide multihop communication paths between wireless clients – serving as a community network or as a broadband access network for the Internet. Wireless mesh networks are considered cost-effective alternatives to wireless LANs, as there is no necessity to deploy any wired infrastructure to support a mesh network. This is particularly attractive in developing countries and rural communities, where large-scale deployment of wired broadband infrastructure is not affordable. With the plummeting cost of 802.11-based hardware platforms, wireless mesh networking is gaining ground with several industry players developing 802.11-based mesh networking platforms and services. There are several technical challenges that must be addressed for mesh networking to be as effective as any other form of broadband networking. Much of these challenges relate to multihop wireless communication and limited capacity. This tutorial is designed to introduce essential mesh networking concepts, lay down the technological challenges and describe how the research community is addressing them. We will explore the issues associated to each layer of the protocol stack as well as various cross-layer approaches. We will also discuss the experiences and lessons learnt from various experimental testbeds. Techniques to build simple mesh network platforms will be explained.

Tutorial 2 - Recent advances in PAPR reduction methods for multicarrier signals

Dr. Yves LOUËT - SUPELEC

Yves LOUËT received his Ph.D. degree in Digital Communications in 2000 from Rennes University, France. He has been with SIRADEL from 2000 to 2002 where he was working as a Research Engineer on channel modelling for cell planning. He is now Associate Professor in SUPELEC since 2002 and his research activities concern PAPR analysis and PAPR mitigation methods in any contexts (OFDM, MIMO-OFDM, software radio, etc.). Yves LOUËT has already organized special sessions in ISSPIT 06 (“Peak to Average Power Ratio of a Multiplex of Modulated Carriers”, Vancouver, Canada), EW 07 (“PAPR mitigation in multicarrier systems” Paris, France) and URSI 08 (“Signal Processing advances for Software Radio”, Chicago, USA). Yves LOUËT is Member of the IEEE and Member of the French Engineering Society (SEE).

Tutorial Summary

This talk is about overview and in-depth study of PAPR mitigation methods for multicarrier signals. It aims to describe PAPR, to propose an original classification of all well known mitigation methods and to explain some of them (like Tone Reservation, Active Constellation Extension, etc.) which are very popular and currently being studied to be applied in future telecommunication standards.

The motivation of this tutorial is due to the ever-growing interest in PAPR mitigation methods in digital telecommunications. The reason lies in low high power amplifier efficiencies when large Input Back Off is mandatory, what is generally the case when signals exhibit large PAPRs. A more efficient solution is to apply a PAPR mitigation method so as to drive the signal close to the saturation point of the power amplifier, where efficiency is higher, but the price to pay could be high (complexity, added power, spectral efficiency loss, bit error rate loss, etc.).

In this context, this tutorial is supposed to answer the following questions:

- why PAPR is of such high interest and how is it defined and calculated?

- what are the methods dedicated to PAPR mitigation?

- what are the parameters any PAPR mitigation method has to trade off?

- how can all these methods be classified?

- how to select a PAPR method in a given context?

- what are the methods of high interest today for PAPR reduction in future telecommunication standards?

This tutorial is supposed to be applied to multi-carrier signals like OFDM and multi standard signals as in software radio contexts.

Tutorial 3 - Multiuser MIMO in Wireless Communications Systems – From Theory to Practice

Dr. Gerhard Bauch & Dr. Guido Dietl - DoCoMo Euro-Labs

Dr. Gerhard Bauch received the Dipl.-Ing. and Dr.-Ing. degree in Electrical Engineering from Munich University of Technology (TUM) in 1995 and 2001, respectively, and the Diplom-Volkswirt degree from FernUniversitaet Hagen in 2001. In 1996, he was with the German Aerospace Center (DLR), Oberpfaffenhofen, Germany. From 1996-2001 he was member of scientific staff at Munich University of Technology (TUM). In 1998 and 1999 he was visiting researcher at AT&T Labs Research, Florham Park, NJ, USAIn 2002 he joined DoCoMo Euro-Labs, Munich, Germany, where he currently manager of the Advanced Radio Transmission Group. In 2007 he was additionally appointed Research Fellow of DoCoMo Euro-Labs. Since October 2003 he has also been an adjunct professor at Munich University of Technology. In 2007 he was a visiting professor teaching courses at the University of Udine in Italy and at the Alpen-Adria-University Klagenfurt in Austria. He received the best paper award of the European Personal Mobile Communications Conference (EPMCC) 1997, the Texas Instruments Award of TUM 2001, the award of the German Information Technology Society (ITG in VDE) 2002 (ITG Foerderpreis) and the literature award of the German Information Technology Society (ITG in VDE) 2007 (ITG-Preis). He is a Senior Member of the IEEE and a member of the German Information Technology Society (ITG in VDE (Association for Electrical, Electronic & Information Technologies)) where he serves as a member of the committee “Information and System Theory.” Since 2008 he has been an associate editor of the IEEE Transactions on Vehicular Technology and for the IEICE Transactions on Communications, Special Section on Radio Access Techniques for 3G Evolution. Dr. Bauch has been member in the technical program committee and organizing committee of several conferences and serves currently as vice chair of the working group 4 “New Air Interfaces, Relay Based Systems and Smart Antennas“ of the Wireless World Research Forum (WWRF). He has (co-)authored a textbook on “Contemporary Communications Systems” as well as more than 100 scientific papers in major journals and international conferences. His research interests include channel coding and modulation, turbo processing, multihop transmission, multiple access and various aspects of signal processing in multi-antenna systems (MIMO).

Dr. Guido Dietl received the Dipl.-Ing. and Dr.-Ing. degree (both summa cum laude) in Electrical Engineering from Munich University of Technology (TUM), Munich, Germany, in 2001 and 2006, respectively. He has been with the TUM from 2001 to 2006 where he was working as a Research Engineer on reduced-rank signal processing in Krylov subspaces and on its application to wireless multiuser communications. In Winter 2000/2001 and Summer 2004, he was a Guest Researcher at Purdue University, West Lafayette, IN, USA. In Fall 2005, he visited the Australian National University (ANU) in Canberra, ACT, Australia. He joined DoCoMo Communications Laboratories Europe GmbH (DoCoMo Euro-Labs), Munich, Germany, in 2006, where he is currently Senior Researcher of the Wireless Technologies Research Group. Dr. Dietl received the VDE Award for his diploma thesis in 2001, the Kurt Fischer Award of TUM for his doctoral thesis in 2007 and the award of the German Information Technology Society (ITG in VDE) 2007 (ITG Foerderpreis). He is member of the IEEE since 2001 and member of the VDE (Association for Electrical, Electronic & Information Technologies) since 2007. He has authored a monograph on “Linear Estimation and Detection in Krylov Subspaces” which has been published by Springer in 2007, and written more than 30 scientific papers in books, journals, and conferences. Besides, he is member in the technical program committee of Globecom 2008. His main research interests are numerical linear algebra, reduced-rank signal processing, iterative (Turbo) detection, and transmit signal processing in multiuser multiple-input multiple-output (MIMO) systems.

Tutorial summary

Multiuser-MIMO (MU-MIMO) will be the next step in practical implementations of multi-antenna transmission methods in commercial systems. A very simple version of MU-MIMO has already been standardized in 3GPP-Long Term Evolution (LTE). MU-MIMO is likely to play a major role for IMT-Advanced systems, standardization of which is just about to start. In fact, it has been proposed by many companies as one of the key technologies in order to achieve the required system throughput. The tutorial is based on both the authors scientific/theoretical work and their active participation in standardization in 3GPP.

We will give an introduction to multiuser MIMO techniques which aim at increasing the sum capacity and spectrum efficiency of the downlink of wireless communications systems. We will report the most important theoretical limits and methods in order to approach those limits. However, the focus of the tutorial is on practical aspects. Since multiuser MIMO has become a topic in standardization for 3GPP-LTE, we concentrate on multiuser MIMO methods and problems which have been discussed in 3GPP-LTE and lead to the respective decisions. This particularly includes design of feedback information, codebook design, actual precoding, receiver processing, and scheduling.

We will show which features of 3GPP-LTE limit the achievable gains by MU-MIMO. Furthermore, we will make proposals for modifications and extensions in order to obtain substantial performance gains by MU-MIMO which could be exploited in IMT-Advanced systems. We will also discuss possible application scenarios and services.

Tutorial 4 - Regulatory Issues

Torsten Lohoff - 7 layers AG, Ratingen/Germany

Testing and Certification Team Manager Working in the testing certification area since 1995, initially as project manager. Started with 7 layers right from the beginning in 1999 and built up the global certification service. Responsible for the whole testing & certification team within 7 layers.

Tutorial summary

In order to place products on the market legally, product certification is mandatory. The requirements as well as the certification regimes are different from country to country. Since there are around 200 countries in the world, it is a challenge to fulfil all the requirements and to manage the whole certification process if a product will be placed on the market globally.

The tutorial shall give an overview about different certification regimes.

Furthermore we will have a look at the requirements for IEEE 802.11a/b/g/n products, since this standard is a good example for a globally harmonized standard. Finally, an outlook about other standards and problems in harmonization is given.

7 layers

7 layers is an engineering company for the wireless industry, working in three business areas: The 7 layers Test House, the System House and the Software House.

The 7 layers AG was founded 1999 in Ratingen (Germany) near Düsseldorf Airport. Further test and service centers, belonging to the 7 layers group have been established in Irvine (USA), Beijing and Shanghai (China), Seoul (Korea), Yokohama (Japan) and Taipei (Taiwan).

Our key personal has more than 25 years of experience in software and systems engineering for wireless and mobile communications technologies. World-wide 7 layers has more than 250 employees, the majority of them engineers.

The Test House and the System House are mainly engaged in industries developing or applying technologies such as GSM, GPRS, 3GPP, HSPA, Bluetooth®, WLAN and electromagnetic compatibility.

As Test House the 7 layers laboratories are accredited according to ISO 17025 and provide services in accordance with ETSI standards, the R&TTE directive, FCC rules etc. 7 layers has Bluetooth Qualification Experts (BQE) and our laboratories are recognized as Bluetooth Qualification Test Facilities (BQTF). In Germany 7 layers runs a large laboratory with a wide range of conformance test equipment and also offers interoperability and field testing services.

As System House 7 layers offers technology development services such as development of technology specifications, test specifications, test cases and test set-ups. We are closely co-operating with key test system manufacturers like Rohde & Schwarz, Spirent, Anite, Anritsu etc. For complex R&D and certification test processes 7 layers also provides customized or ready-made test solutions.

The 7 layers Software House provides standard software under the brand “InterLab®”. Generally speaking, the InterLab software supports all product lifecycle management steps like requirements management, requirements verification and specification, requirements policy management, test management and issue management.

More information can be found at www.7layers.com and www.interlab.com.