Fundamentals of Cognitive Radios
A 3-Day Short Course
This course provides an introduction to cognitive radios, a new type of radio that will be capable of cooperatively adapting transmission modes, channels, and protocols to make the best use of the available spectrum. Such radios will include wideband receivers and transmitters, with many of their functions implemented in software, rather than hardware, to enable greater flexibility. While the most commonly cited example of uses of such radios is sharing of under-used portions of the spectrum with licensed (primary) users, the basic technology also can lead to improved uses of the ISM bands. In addition, the cooperative and adaptive nature of the radios has large consequences for jamming/anti-jamming in military communications, representing both a threat to current systems and an opportunity for their evolution to more secure modes. The course provides a background in the technology that makes these radios possible as well as providing guidance on their benefits in multiple access systems.
Lecture notes are distributed on the first day of the course. These notes are for participants only and are not for sale.
Coordinator and Lecturer
Gregory J. Pottie, PhD, Professor and Associate Dean, Department of Electrical Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. From 1989-1991 Professor Pottie worked in the transmission research department of Motorola/Codex in Canton, Massachusetts, with projects related to voiceband modems and digital subscriber lines. Since 1991 he has been a faculty member of the UCLA Electrical Engineering Department, serving in vice-chair roles from 1999-2003. Since 2003 he has also served as Associate Dean for Research and Physical Resources of the Henry Samueli School of Engineering and Applied Science. His research interests include reliable communications, wireless communication systems, and wireless sensor networks. His current focus is on the information theory of sensor networks and design of robust cognitive radio networks. From 1997-1999 he was secretary to the board of governors for the IEEE Information Theory Society. In 1998 he received the Allied Signal Award for outstanding faculty research for UCLA engineering. In 2005 he became a Fellow of the IEEE for contributions to the modeling and applications of sensor networks. Dr. Pottie is the deputy director of the NSF-sponsored science and technology Center for Embedded Networked Sensing.
Babak Daneshrad, PhD, Professor, Department of Electrical Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. Professor Daneshrad joined UCLA in September 1996. His research is in the areas of wireless communication system design, experimental wireless communications, and VLSI for communications. Over the past five years, he has concentrated primarily on MIMO OFDM systems for indoor/outdoor wireless communications, and has built one of the first MIMO OFDM experimental systems achieving upwards of 160 Mbps in laboratory settings. His current focus is on low-power broadband MIMO wireless systems as well as cognitive radio communications in the ISM band. He is the recipient of the 2005 Okawa Foundation Award, a co-author of the best paper award at PADS 2004, and was awarded first prize in the DAC 2003 design contest. He is the beneficiary of the Endowment for UCLA-Industry Partnership for Wireless Communications and Integrated Systems. In January 2001 he co-founded Innovics Wireless, a company focused on developing 3G-cellular mobile terminal antenna diversity solutions and in 2004 he co-founded Silvus Communications. From 1993-1996 he was a member of technical staff with the Wireless Communications Systems Research Department of AT&T Bell Laboratories, where he was involved in the design and implementation of systems for high-speed wireless packet communications.
Mani B. Srivastava, PhD, Professor, Department of Electrical Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. Dr. Srivastava is currently working on various architecture, protocol, and algorithm aspects of multimedia communications over packet wireless networks, networks of embedded systems, and low-power systems. He has previously served as a PI on research funded through DARPA’s ACERT, GloMo, PAC/C, and SenseIT programs, and is currently involved in the International Technology Alliance in Network and Information Sciences and NSF’s Future Internet Network Design programs. Prior to joining UCLA, he was at Lucent/AT&T Bell Laboratories, where his team created the SWAN Wireless ATM system that was one of the first system prototypes to provide end-to-end quality of service for multimedia traffic in a mobile and wireless packet-switched network. He holds five patents in mobile and wireless networking. Dr. Srivastava has published more than 200 papers in various journals and conferences and book chapters. He has been the recipient of the President of India Gold Medal, the NSF CAREER Award, the Okawa Foundation Grant, and awards at various top conferences for best paper, demonstration, and design contest. He has served as program chair of ACM MobiHoc, ACM SenSys, and IEEE/ACM IPSN; on the editorial boards of IEEE Transactions on Mobile Computing, IEEE/ACM Transactions on Networking, and ACM Transactions on Sensor Networks; and as the editor-in-chief of the ACM Mobile Computing and Communications Review.
Mihaela van der Schaar, PhD, Associate Professor, Department of Electrical Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. Since 1999, Dr. van der Schaar has been an active participant to the ISO Motion Picture Expert Group (MPEG) standard, for which she received three ISO recognition awards. She chaired the ad-hoc group on MPEG-21 Scalable Video Coding for three years and co-chaired the MPEG ad-hoc group on Multimedia Test-Bed. She has published extensively on multimedia compression, processing, communications, networking, and architectures. Prior to joining the UCLA faculty, Dr. van der Schaar was a senior researcher at Philips Research in the Netherlands and USA, where she led a team of researchers working on multimedia coding, processing, networking, and streaming algorithms and architectures. From January to September 2003, she also was an adjunct assistant professor at Columbia University. Dr. van der Schaar was elected as a Member of the Technical Committee on Multimedia Signal Processing and Image and Multidimensional Signal Processing of the IEEE Signal Processing Society. She was an associate editor of IEEE Transactions on Multimedia and SPIE Electronic Imaging Journal from 2002-2005. Currently, she is an Associate Editor of IEEE Transactions on Circuits and System for Video Technology and an Associate Editor of IEEE Signal Processing Letters. Dr. van der Schaar received the NSF CAREER Award in 2004, IBM Faculty Award in 2005, Okawa Foundation Award in 2006, the 2005 IEEE Transactions on Circuits and Systems for Video Technology Best Paper Award, and the Most Cited Paper Award for the EURASIP Journal Signal Processing: Image Communication between the years 2004-2006.
Yuanxun (Ethan) Wang, PhD, Assistant Professor, Department of Electrical Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. Professor Wang’s current work is focused on high-performance antenna array and microwave amplifier systems for wireless communication and radar, as well as numerical modeling techniques. His research interests feature the fusion of signal processing and circuit techniques in microwave system design. From 1993-1995 Dr. Wang worked as a graduate researcher at the University of Science and Technology of China (USTC) on numerical methods and millimeter-wave radar-based instruments. From 1995-1999 he joined the Department of Electrical and Computer Engineering, University of Texas at Austin, as a graduate research assistant working on radar scattering modeling and synthetic aperture radar imaging. From 1999 Dr. Wang worked as a research engineer and lecturer in UCLA’s Department of Electrical Engineering, and subsequently joined its faculty as an assistant professor in November 2002. He is a member of IEEE and SPIE, and has authored and coauthored over 60 refereed journal and conference papers.
Historical Perspective on Radio Communication Technology and Policy (Pottie and van der Schaar)
- Technological origin of frequency and spatial partition of spectrum
- Usage patterns in licensed and unlicensed bands
- Adaptive capabilities of cognitive radios and policy consequences
- Emerging wideband and cognitive radio standards
Interference Suppression and Avoidance in Multiple Access Communications (Pottie)
- Radio propagation
- Mitigation of multipath fading coding through modulation and coding
- Power control and antenna adaptation
- Cooperative estimation of interference
- Interference averaging and avoidance techniques in homogeneous environments
- Averaging and avoidance in heterogeneous environments
- Jamming threats and anti-jam opportunities with cognitive radios
Multimedia Transmission in Multiple Access Systems (van der Schaar)
- Quality of service requirements for multimedia applications
- Developing a spectrum access economy: game-theoretic solutions for spectrum coordination and charging in cognitive radio networks
- Cross-layer stochastic modeling and strategic transmission
- Multi-agent interactive learning and cognitive decision making for dynamic reconfiguration and anti-jamming prevention
- Dynamic risk and reward assessment for delay-sensitive applications
- Extension to heterogeneous, multi-hop, cognitive radio networks
Wideband Antenna Systems (Wang)
- Principles of antenna design
- Coupled antenna system for compact spacing with orthogonal radiation modes
- Intelligent control for multi-mode operation
Software/Hardware Partitioning in Radio Design (Srivastava)
- Historical overview of analog to digital to software-defined radio
- System architecture and design methodology for software-defined radios
- Energy efficiency, protocol design, and cross-layer hardware-software issues
Experimental Cognitive Radio Design Examples (Daneshrad)
- High-speed multi-input multi-output (MIMO) software-defined radio testbed
— Design history, development challenges
- Other testbed examples
For more information contact the Short Course Program Office:
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