CONSTANTINOS B. PAPADIAS

•   Professor
  Broadband Wireless & Sensor Networks, AIT

Adjunct Faculty
Information Networking Institute (INI)
Carnegie Mellon

CONTACT INFORMATION

Athens Information Technology
PO Box 68, 19.5 km, Markopoulo Avenue
Peania 19002, Athens, Greece
Tel: (+) 30-210-668-2762
Mob: (+) 30-69-4742-8689
Fax: (+) 30-210-668-2703
Email: papadias@ait.edu.gr

PERSONAL DATA

Date and place of birth: January 16, 1969, Athens, Greece
Citizenship: Greek
Languages: Greek (native), English (fluent), French (fluent).
Marital status: married, father to two children.

EDUCATION

Degrees Conferred

• Engineer (EE) - National Technical University of Athens - 1991
• Ph.D. (Signal Processing-highest honors) - Ecole Nationale Supérieure des Télécommunications, Paris, March 1995

SUMMARY

Dr. Constantinos B. Papadias joined AIT in March, 2006, as an Associate Professor in the Broadband Wireless and Sensor Networks research group. Prior to this appointment he was Technical Manager in Bell Labs, Lucent Technologies’ Wireless / Broadband Access Research Center (currently on leave). He has spent the last 15 years of his career conducting and managing research, as well as teaching, in the broad area of wireless digital communications, both in the academic and the industrial sector. His research interests range from baseband wireless communications and smart antennas to scheduling and system-level optimization of wireless networks to cognitive radio and multihop wireless networks. Throughout his career so far, he has had the fortunate opportunity to meet, be guided by and collaborate with numerous researchers in the field, to whom he owes a lot of what he has learnt and he hopes to maintain and initiate many more fruitful collaborations in the future. He believes that collaboration is a key element of high impact research. He was also fortunate enough to be able to see research from various angles, i.e. from the academic, the industrial, the small company and the standards group, etc. He believes that these different points of view, sometimes seemingly opposing each other, have enriched him in being better equipped to question the motivation and judge the value of research efforts. He also has a keen desire to help explore, develop, guide and learn from new minds, a trait that his current position will certainly allow him to further expand substantially.

Dr. Papadias is a graduate of the National Technical University of Athens (Diploma, 1991) and the Ecole Nationale Supérieure des Télécommunications (Doctorate, 1995), as well as an alumnus of Stanford University’s Smart Antennas Research Group (SARG), where he was a post-doctoral follow during the period 1995-1997. He is a Senior Member of the IEEE and a Member of the Technical Chamber of Greece.

RESEARCH & TEACHING EXPERIENCE

• Summer 1989 Practical Training at the Public Power Corporation of Greece during 3 months.
• Summer 1990 Practical Training at the Electricité de France, les Renardières, during one month.
• Sept. ’90- June ’91 Diploma Thesis. Worked at the Signal Processing Laboratory of the National Technical University of Athens.
• Oct. ’91 - July ’92 PhD student at E.N.S.T. Took graduate courses in signal processing and telecommunications and began research in adaptive filtering algorithms for communications applications.
• Sept. ’92 - March ’95 Research Assistant, Eurécom Institute.
• Worked for his PhD thesis under the supervision of professor D. Slock and conducted research in the field of blind equalization for digital transmission systems. Proposed several new techniques and algorithms that increase the performance characteristics of existing schemes, as well as novel approaches to the problem.
• Spring ’93 Teaching Assistant, to professor D. Slock and professor P. Humblet, Eurécom. Courses: Signal Processing, Telecommunications. Was responsible for giving lectures, exercises and laboratory assignment as well as for the preparation and correction of homeworks.
• Spring ’94 Teaching Assistant, to professor D. Slock. Course: Signal Processing.
• Sept. ’94- March ’95 Teaching Assistant, to professor P. Humblet, Eurecom. Supervised master-thesis projects.
• April ’95 - Sept. ’97 Post-doctoral researcher, Stanford University.
  Joined the Information Systems Laboratory as a member of the Smart Antennas Research Group, headed by professor A. Paulraj. Conducted research on array signal processing, with focus on blind algorithms for space-time signal processing. Supervised graduate students in the group. Was involved with several research programs related to applications of smart antennas signal processing to wireless communications systems. He was also involved with the organization of the annual Workshop on Smart Antennas in Wireless Mobile Communications which is held every summer in Stanford University. He also taught short courses on smart antennas.
• October ’97 - July 2001 Member of Technical Staff, Bell Laboratories, Lucent Technologies.
  Joined the Wireless Communications Systems Research Department of Bell Laboratories, headed by Dr. Reinaldo Valenzuela. Participated in several research projects focused on the study and design of transceivers for wireless communication systems, with an emphasis on signal processing techniques for multiple transmit/ multiple receive systems.
• July 2001 – Feb. 2006 Technical Manager, Global Wireless Systems Research, Bell Labs, Lucent Technologies (currently on leave). He lead an international team of researchers (both in the USA and in the UK), with the goal of inventing and contributing to the design of future (fourth generation and beyond) wireless air interfaces. The team focuses on the invention and study of innovative transmission solutions for next generation wireless networks, ranging from physical layer to scheduling to system-level optimization techniques. We kicked off and participated in several EU and DARPA projects and conducted award-winning research that has found its way in several papers, patents and standards contributions. The team belongs to Lucent’s Broadband and Wireless Access Research Center, which is part of Bell Laboratories’ core research organization.
• Sept. 2004- Dec. 2006 Adjunct Associate Professor, Columbia University. Taught graduate courses on space-time wireless systems.
• March 2006 - to date: Associate Professor, AIT
• May 2006 - to date: Adjunct Faculty, INI, Carnegie Mellon

RESEARCH INTERESTS

Baseband digital (especially wireless) communications, signal processing algorithms for wireless communication systems; blind / semi-blind equalization, channel identification, source separation and channel tracking; multiple input / multiple output (MIMO) systems; information theory; space-time coding; adaptive filtering, statistical signal and array processing; direction finding; smart antennas; wireless network design and optimization; re-configurable wireless systems; wireless LANs, dynamic resource allocation, scheduling / MAC layer optimization for wireless systems, cross-layer design, mesh / multihop networks, context-aware networks, cognitive radio networks, etc.

SOCIETIES

• 1988: IEEE student member
• 1991: Member of the Technical Chamber of Greece
• 1996: IEEE member
• 2002-present: Member of the “Signal Processing for Communications” Technical Committee of the IEEE Signal Processing Society and serves as the Committee’s Industrial Liaison.
• 2002-2006: Member of the Steering Board of the Wireless World Research Forum (WWRF), representing Lucent Technologies. Served as the board’s R&D issue manager
• 2003: IEEE Senior Member

HONORS

• 1990: Award for top-tier under-graduate records by the National Bursaries Foundation of Greece.
• 1991: Award for graduate studies abroad from the Eugenides Foundation (Greece).
• 1995: Highest distinction for his PhD thesis from his oral examination committee (composed by professors C. Gueguen, A. G. Constantinides, J. LeRoux, P. Duhamel, D. Slock and S. Marcos) and special mention of excellent teaching abilities.
• 2002: Promoted to Technical Manager, Wireless Research Lab, Lucent Technologies. (he is the youngest member of Bell Labs Wireless Research Lab’s management team).
• 2002,2003: Cited in Marquis Who’s Who in America
• 2003: Co-recipient of the Bell Labs President’s Gold award for his contributions to the Bell labs LAyered Space-Time (BLAST) project (“signal processing algorithms”).
• 2004: Recipient of the IEEE Signal Processing Society’s Young Author Best Paper Award (2003).
• 2004: Co-recipient of the Central Bell Labs Teamwork Award (for founding and contributing to the FP5 project FITNESS)
• 2005: Cited in Marquis Who’s Who in the World
• 2006: Named a technology expert by the Greek Secretariat of Research and Technology, responsible for the European Commission’s 7th Framework Programme (FP7) specific program “IDEAS.”

EDITORIAL WORK / PAPER REVIEWING

• 2002-2005: Associate Editor, IEEE Transactions on Signal Processing
• 2003: Guest Editor, EURASIP Journal on Applied Signal Processing, Special issue on MIMO Communications and Signal Processing (appeared May 2004). Co-editors: S. Barbarossa, V. Poor, X. Wang.
• Paper reviewing: IEEE Transactions on Signal Processing, IEEE Signal Processing Magazine, IEEE Signal Processing Letters, IEEE Transactions on Wireless Communications, Signal Processing Elsevier, IEEE Journal on Selected Areas in Communications, IEEE Transactions on Communications, IEEE Transactions on Vehicular Technology, the International Journal of Adaptive Control and Signal Processing, and several other international conferences and journals.
• Member of Technical Program Committee in several technical conferences (ICC, Globecom, IST, SPAWC, PIMRC, etc.)

BOOKS

• Editor, “Space-Time Wireless Systems: From Array Processing to MIMO Communications” (co-edited with H. Bolcksei, D. Gesbert, and A. van der Veen), by Cambridge Press, June 2006, ISBN 052185105X.

TEACHING

• Athens Information Technology, "Wireless Communications", MSITT program, Spring Semester, 2006 (as part of the Class ``Wireless and Optical Communications’’ with A. Tzanakaki). Same course taught currently with I. Tomkos, Fall 2006.
• Athens Information Technology, "Digital Communications & Signal Processing System Design" (with A. Pnevmatikakis), MSIN program, Summer Semester 2006.
• Athens Information Technology, "Digital Communications" (with L. Polymenakos), MSIN program, Fall Semester 2006.
• Athens Information Technology, "Special Topics in Communications & Networking" (with S. Sygletos), MSIN program, Fall Semester 2006.
• Columbia University, Class ELEN6880, (topics in signal processing), “Space-Time Coding and Signal Processing for Wireless Communications,” fall semester, 2004 and fall semester, 2005.

SHORT COURSES

• “Multiple antenna techniques for wireless systems,” short course to be taught at Aalborg University, Aalborg, Denmark, Dec. 16-17, 2006.

CONFERENCE ORGANIZING

• Chairman, 10th WWRF meeting, New York, NY, Oct. 27-28, 2003.
• Has contributed to the organization of several other conferences and workshops (such as the recently held Crowncom conference on cognitive radio and the PIMRC 2007 conference, to be held in Athens in Sept. 2007).

TUTORIALS

• [T1] C. Papadias and A. Lozano, “An Overview of MIMO Systems for Wireless Communications,” tutorial given at the 2005 ICASSP Conference, Philadelphia, USA, March 2004.
• [T2] H. Huang and C. Papadias, “MIMO techniques for Wireless Systems,“ tutorial to be given at the 2006 IEEE Sarnoff Symposium, Princeton University, March 27-28, Princeton, NJ, USA.
• [T3]A. Lozano and C. Papadias, “MIMO Systems for Wireless Communications,” tutorial given at the 2006 IEEE International Conference on Communications (ICC ‘2006), Istanbul, Turkey, June 11-15, 2006.Will soon be offered on-line by the IEEE ComSoc Society.
• [T4] H. Huang and C. Papadias, “System-level MIMO: Theory and Applications,” tutorial given at the 2006 IEEE Globecom Conference, San Francisco, Nov. 27 – Dec. 1, 2006.
   

STANDARDS CONTRIBUTIONS

He was a co-inventor of the “Space-Time Spreading (STS)” transmit diversity scheme that was adopted by the cdma-2000 3rd generation cellular standard as an optional transmit diversity mode for voice communication (contribution 3GPP2-C30-19990817-014, accepted Sept. 1999).

INTERNATIONAL / NATIONAL PROJECTS

He was the main initiator of the FITNESS project (Fourth-generation Intelligent Transparent Networks Enhanced through Space-time Systems), which was funded by the European Commission’s Information Society Technologies (IST) Programme (under FP5) for the period 2001-2003. He oversaw the project’s technical management. He co-ordinated a Network of Excellence on Smart Antennas (SANE) proposal, which obtained funding by the IST 6th Framework Programme (FP6), under the ACE consortium. He oversaw Bell Labs’ participation in WINNER, an FP6 integrated project aiming at the design of a next generation wireless air interface, as well as the targeted research FP6 project OBAN. He is also the main initiator of the recently accepted IST FP6 project MEMBRANE (Multi-Element Multihop Backhaul Reconfigurable Antenna NEtwork), which focuses on wireless reconfigurable multi-hop MIMO backhaul networks. Through members of his team he participated in the DARPA-funded project MnM (Multi-node MIMO) and under Bell Labs, in various other research projects, including an ongoing scientific and technological cooperation project with the University of Athens (as “project leader abroad”).

CITATIONS

• More than 300 journal-to-journal citations (see e.g. ISI Web of Knowledge) and more than 300 citations in international conference proceedings, books, and patent applications.
• His paper with A. Paulraj "Space-Time Processing for Wireless Communications", [J2] was recently recognized as "the most highly cited paper in wireless networks" over the last decade by Essential Science Indicators (ESI)

PAPER AWARDS

Was awarded the IEEE Signal Processing Society’s Young Author Best Paper Award, (year: 2003, topic “Signal Processing for Communications”) for paper [J8].

INVITED LECTURES / CHAIRED SESSIONS / PANELS

Invited lectures

• [1] “Blind joint equalization of multiple synchronous mobile users using oversampling and/or multiple antennas,” session WA1: Signal Processing and Communications, 28th Annual Asilomar Conference on Signals, Systems, and Computers, Nov. 2, 1994.
• [2] “Some recent methods and results for the blind equalization of linear communication channels, Information Systems Laboratory, Stanford University, Nov. 4, 1994.
• [3] “Multichannel blind identification and equalization,” I3S-CNRS, Sophia Antipolis, France, Feb. 23, 1995.
• [4] “Some recent results on the blind linear equalization of polyphase channels,” University of California at Berkeley, Department of Electrical Engineering and Computer Science, Jan. 24, 1997.
• [5] “Space-time signal processing for wireless communications: a survey,” First Signal Processing Workshop on Signal Processing Advances in Wireless Communications (SPAWC’97), Paris, France, April 16, 1997.
• [6] “Blind separation of independent co-channel signals,” 13th Internationl Conference on Digital Signal Processing, Santorini, Greece, July 4, 1997.
• [7] “On the blind separability of multiple user signals in the presence of delay spread,” 31st Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 2-5, 1997.
• [8] “Second-order-based blind equalization/ separation of i.i.d. signals,” International Conference on Telecommunications (ICT-98), Chalkidiki, Greece, June 22-25,1998.
• [9] “Adaptive multi-user detection for fading CDMA channels,” 32nd Asilomar ’98 Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, Nov. 1-4, 1998.
• [10] “Some recent research results on space-time signal processing for CDMA systems,”
  invited talk at University of California at Berkeley, seminar series on communications, Oct. 29, 1998.
• [11] “Some recent research results on space-time signal processing for CDMA systems,”
  invited talk at Stanford University, Oct. 30, 1998.
• [12] “Performance analysis of finite-length DFE receivers based on a polyphase representation,” 32nd Asilomar ’98 Conference on Signals, Systems, and Computers,
  Pacific Grove, CA, USA, Nov. 1-4, 1998.
• [13] “Kurtosis-based optimization criteria for blind source separation with applications to multi-user detection for CDMA systems,” invited talk at Princeton University, ISS group seminar, Dec. 10, 1998.
• [14] “Kurtosis-based optimization criteria for blind source separation with applications to multi-user detection for CDMA systems,” invited talk at Eurecom Institute, Sophia Antipolis, France, Dec. 21, 1998, weekly technical seminar.
• [15] “Recent advances in the blind deconvolution of linear channels,” invited talk given at the Mathematics for Communications Research Department of Bell Laboratories, Murray Hill, NJ, Jan. 26, 1999.
• [16] “Space-time spreading for CDMA systems,” invited talk at the 6th workshop on Smart Antennas in Wireless Mobile Communications, Stanford University, Stanford, CA, July 22-23, 1999.
• [17] “Space-Time Spreading: a transmit diversity scheme for cdma-2000, ” invited talk at the Wireless Circuits and Systems Research Department of Bell Laboratories, Swindon, UK, Oct. 19, 1999.
• [18] “BLAST receiver processing using very few (if any) training symbols,” invited talk at 1st Bell Labs BLAST Workshop, Murray Hill, Feb. 2-3, 2000.
• [19] “Blind signal separation in narrow band BLAST systems,” invited talk at CISS-2000 Conference, Princeton, NJ, March 15-17, 2000.
• [20] “Channel estimation for BLAST: fundamental limitations,” invited talk at 1st BLAST Coffee Hour, Murray Hill, March 25, 2000.
• [21] “Smart antennas: a technology that can help boost the capacity of wireless communication systems,” invited talk at the Dept. of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece, April 5, 2000.
• [22] “Open-Loop Transmit Diversity Technique for Systems Employing Four Transmitter Antennas,” invited talk in ICASSP-2001 conference, special session on space-time coding, Salt Lake city, May 7-11, 2001.
• [23] “An overview of some recent research studies in the area of multiple antenna communication systems”, invited talk given at Stanford University, January 10, 2002.
• [24] “An overview of some recent research studies in the area of multiple antenna communication systems”, invited talk given at Drexel University, March 14, 2003.
• [25] “An overview of some recent research studies in the area of multiple antenna wireless communication systems,” invited seminar, Athens Information Technology, Athens, Greece, Sept. 1, 2003.
• [26] “An overview of some recent research activities in the area of multiple antennas wireless communication systems,” invited seminar given at the Dept. of Informatics and Telecommunications, University of Athens, Sept. 5, 2003.
• [27] “FITNESS: Fourth-generation Intelligent Transparent Networks Enhanced through Space-time Systems (project summary),” invited presentation given at the “Globecom at Stanford symposium, organized by the Smart Antenna Research Group at Stanford University, Stanford, CA, Dec. 5, 2003.
• [28] “Some Recent EU-funded MIMO Research Activities,” invited talk at the 2004 Workshop on Smart Antennas in Wireless Communications, Stanford University, Stanford, CA, July 29-30, 2004.
• [29] “Some recent advances in the area of space-time wireless communications,” invited seminar, Athens Information Technology, Athens, Greece, Sept. 5, 2004.
• [30] “An overview of some recent research activities in the area of space-time wireless systems and their application to wireless networks,” invited seminar given at CyLab, Carnegie Mellon University, Nov. 29, 2005.

Chaired sessions

• [1] 28th Annual Asilomar Conference on Signals, Systems, and Computers, Nov. 2, 1994. Chaired the poster session WA8a (equalization).
• [2] Third Workshop on Smart Antennas in Wireless Mobile Communications, Stanford University, July 26, 1996. Chaired the first oral presentation session.
• [3] 13th International Conference on Digital Signal Processing, Santorini, Greece, July 2-4, 1997. Organized and chaired the special session “Signal Processing Techniques for Wireless Communications”.
• [4] Sixth Workshop on Smart Antennas in Wireless Mobile Communications, Stanford University, July 22, 1999. Chaired session IV.
• [5] 2000 Conference on Information Sciences and Systems (CISS-2000), March 15-17, 2000. Co-chaired and organized the session “Signal Processing for Wireless Communications I”.
• [6] 2000 IEEE International Symposium on Information Theory (ISIT ’2000),” Sorrento, Italy, June 25-30, 2000. Chaired the session “Signal Processing I”.
• [7] 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP-2001), chaired the session “Constant Modulus Algorithms.”
• [8] 2003 International Conference on Communications (ICC 2003), chaired the session CT5 “Space-Time Coding and Unknown Channels.”
• [9] 2003 Information Society Technologies (IST) Mobile Communications Summit, chaired session on MIMO techniques.
• [10] 2003 Globecom Conference (Globecom ’03), chaired session WC-31, “Multiple Carrier & Antenna Systems II.”
• [11] 2004 Globecom Conference (Globecom ’04), chaired session on interference cancellation.
• [12] 2005 ICASSP Conference (ICASSP ’05), chaired session on MIMO channel estimation.
• [13] 12th European Wireless Conference (EW2006), Athens, Greece, April 2-5, 2006: chaired session A5 on Smart Antennas, MIMO and Beamforming.
• [14] 15 th IST Mobile Summit, Mykonos, Greece, June 4-8, 2006: chaired session "MIMO Systems I".

PANELS

• [1] 2005 ICASSP Conference, Philadelphia, USA, March 18-23, 2005: participated in Panel entitled "when will"
• [2] 1st CROWNCOM Conference (CROWNCOM 2006), Mykonos, Greece, June 8-10, 2006: participated in Panel II: "Cognitive Radio Dynamic Spectrum Access: Enablers & Future Architectures".

PUBLICATIONS

Appeared / accepted journal articles

• [J1] C. B. Papadias and D. T. M. Slock, “Normalized Sliding Window Constant Modulus and Decision-Directed Algorithms for Blind Equalization: a Link Between Blind Equalization and Classical Adaptive Filtering,” IEEE Transactions on Signal Processing, vol. 45, No. 1, pp. 231-235, Jan. 1997.
• [J2] A. Paulraj and C. B. Papadias, “Space-Time Processing for Wireless Communications,” IEEE Signal Processing Magazine, vol. 14, No. 6, pp. 49-83, Nov. 1997.
• [J3] M. C. Vanderveen, C. B. Papadias and A. Paulraj, “Joint Angle and Delay Estimation (JADE) for Multipath Signals Arriving at an Antenna Array,” IEEE Communications Letters, vol. 1, No. 1, pp. 12-14, Jan. 1997.
• [J4] V. U. Reddy, C. B. Papadias and A. Paulraj, “Blind Identifiability of Certain Classes of Multipath Channels for Second-Order Statistics Using Antenna Arrays,” IEEE Signal Processing Letters, vol. 4, No. 5, pp.138-141, May 1997.
• [J5] C. B. Papadias and A. Paulraj, “A Constant Modulus Algorithm for Multi- User Signal Separation in Presence of Delay Spread Using Antennas Arrays,” IEEE Signal Processing Letters, vol. 4, No. 6, pp. 178-181, June 1997.
• [J6] C. B. Papadias and D. T. M. Slock, “Fractionally Spaced Equalization of Linear Polyphase Channels and Related Blind Techniques Based on Multichannel Linear Prediction,” IEEE Trans. Signal Processing, vol. 47, No. 3, pp. 641-654, March 1999.
• [J7] J. Chen, C. Papadias, J. Foschini, “Dynamic Signature Assignment for Direct- Spread CDMA Systems,” IEEE Communications Letters, vol. 4, No. 6, pp. 181-183, June 2000.
• [J8] C. Papadias, “Globally Convergent Blind Source Separation Based on a Multiuser Kurtosis Maximization Criterion,” IEEE Trans. Signal Processing, vol. 48, No. 12, pp. 3508-3519, Dec. 2000.
• [J9] B. Hochwald, T. Marzetta, C. Papadias, “A Transmitter Diversity Scheme for Wideband CDMA Systems Based on Space-Time Spreading,” IEEE Journal on Selected
  Areas in Communications (J-SAC), Special Issue on Wideband CDMA (II), vol. 19, No. 1, pp. 48-60, Jan. 2001.
• [J10] C. Papadias and H. Huang, “Linear Space-Time Multiuser Detection for Multipath CDMA Channels,” IEEE Journal on Selected Areas in Communications (JSAC), pp. 254-265, vol. 19, No. 2, Feb. 2001.
• [J11] A. Lozano, C. Papadias, “Space-Time Receivers for High Spectral Efficiency Wireless Communication in Frequency-Selective Channels,” IEEE Trans. on Communications, pp. 65-73, vol. 50, No. 1, Jan. 2002.
• [J12] C. B. Papadias and G. J. Foschini, “On the Capacity of Certain Space-Time Coding Schemes,” EURASIP Journal on Applied Signal Processing, special issue on Space-Time Coding and its Applications, pp. 447-458, vol. 5, May 2002.
• [J13] N. Sharma and C. B. Papadias, “Improved Quasi-Orthogonal Codes through Constellation Rotation,” IEEE Trans. Communications, vol. 51, No. 3, pp. 332-335, March 2003.
• [J14] C. B. Papadias and G. J. Foschini, “Capacity-Approaching Space-Time Codes for Systems Employing Four Transmitter Antennas,” IEEE Trans. on Information Theory, vol. 49, No. 3, pp. 726-732, March 2003.
• [J15] D. Samardzija, C. B. Papadias and R. Valenzuela, “Experimental Evaluation of Unsupervised Channel Deconvolution for Wireless Multiple-Transmitter / Multiple-Receiver Systems,” IEE Electronics Letters, pp. 1214-1216, vol. 38, No. 20, Sept. 2002.
• [J16] G. J. Foschini, D. Chizhik, M. J. Gans, C. Papadias and R. A. Valenzuela, “Some Basic Layered Space-Time Architectures and their Performance,” IEEE Journal on Selected Areas in Communications, special issue on MIMO systems and applications, vol. 21, No. 3, pp. 303-320, March 2003.
• [J17] J. Ling, D. Avidor, D. Furman, C. Papadias, “On the Financial Impact of Multiple Antenna Systems to Wireless CDMA Operators,” IEEE Wireless Communications Magazine, special issue on “(R)Evolution towards 4G Mobile Communication Systems,” vol. 10, No. 4, pp. 62-65, August 2003.
• [J18] C. B. Papadias, “Unsupervised Receiver Processing Techniques for Linear Space-Time Equalization of Wideband Multiple Input / Multiple Output Channels,” IEEE Transactions on Signal Processing, vol. 52, No. 2, pp. 472 - 482, Feb. 2004.
• [J19] J. Chen, C. Papadias, J. Foschini, “Space-Time Dynamic Signature Assignment for the Reverse-Link of DS-CDMA Systems,” IEEE Transactions on Communications, vol. 52,No. 1,Jan. 2004, pp. 120-129.
• [J20] N. Sharma and C. Papadias, “Full Rate Full Diversity Linear Quasi-Orthogonal Space-Time Codes for any Transmit Antennas,” EURASIP Journal on Applied Signal Processing, special issue on “Advances in Smart Antennas,” vol. 9, pp. 1246-1256, 2004.
• [J21] D.I. Axiotis, T. Al-Gizawi, K. Peppas, E. N. Protonotarios, F. I. Lazarakis, C. Papadias, P. I. Philippopoulos, “Services and Architectures for Interworking 3G and WLAN Networks,” IEEE Wireless Communications Magazine, special issue on “Applications and Services for the B3G/4G era,” vol. 11, no. 5, Oct. 2004
• [J22] D. Samardzija, A. Lozano, C. Papadias, “Design and Experimental Validation of MIMO Multiuser Detection for Downlink Packet Data,” EURASIP Journal on Applied Signal Processing, special issue on “System-Integration-Oriented Transceiver Designs for Wireless Networks Beyond 3G,” pp. 1769-1777, vol. 2005, No. 11, Nov. 2005.
• [J23] A. Alexiou, D. Avidor, P. Bosch, S. Das, P. Gupta, B. Hochwald, T. E.Klein, J. Ling, A. Lozano, T. Marzetta, S. Mukherjee, S. Mullender, C. Papadias, R. Valenzuela, H. Viswanathan, “Duplexing, Resource Allocation and Intercell Coordination-Design Recommendations for Next Generation Systems,” Wiley Wireless Communications and Mobile Computing, special issue on “Emerging Access Technologies,” vol. 5, pp. 77-93, May, 2005.
• [J24] N. Sharma and C. Papadias, “Reduced complexity ML Decoding of Rate 6/8 and Rate 1 Linear Complex Space-Time codes for up to 8 Transmit Antennas with Phase Feedback,” IEEE Signal Processing Letters, vol. 12, No. 8, pp. 565-568, August, 2005.
  [J25] A. Alexiou and C. Papadias, “Reconfigurable MIMO transceivers for Next- Generation Wireless Systems,” Bell Labs Technical Journal, vol. 10, No. 2, pp.139-156, August 2005.
• [J26] T. Kaiser, A. Bourdoux, S. Choi, A. Fuertes, B. Ottersten, C. Papadias, S. Paul, A. Paulraj and J. Winters, “When will smart antennas be ready for the market? Part I,” IEEE Signal Processing Magazine, (DSP forum), pp. 87-92, March 2005.
• [J27] T. Kaiser, A. Bourdoux, S. Choi, A. Fuertes, B. Ottersten, C. Papadias, S. Paul, A. Paulraj and J. Winters, “When will smart antennas be ready for the market? Part II,” IEEE Signal Processing Magazine, (DSP forum), vol. 22, No. 6, pp. 174-176, Nov. 2005.
• [J28] A. Kuzminskiy, H. Karimi, D. Morgan. C. Papadias, D. Avidor and J. Ling, “Downlink Throughput Enhancement of IEEE 802.11a/g Using SDMA with a Multi- Antenna Access Point,” to appear, EURASIP Signal Processing Journal, special issue
  on Advances in Signal Processing-assisted cross layer Designs,” 2006.
• [J29] S. Mukherjee, D. Avidor, J. Ling, and C. Papadias, “On Asymptotically Fair Transmission Scheduling Over Fading Channels with Measurement Delay,” to appear, IEEE Transactions on Wireless Communications, 2006.
• [J30] A. M. Kuzminskiy, F. J. Mullany, and C. B. Papadias, “Steered-STS Transmit Antenna Architecture with Semi-blind Channel Estimation at the Receiver in CDMA2000,” to appear, IEEE Transactions on Vehicular Communications, 2006.

Conference articles

• [C1] C. B. Papadias and D. T. M. Slock, “Normalized Sliding Window Constant Modulus Algorithms for Blind Equalization,” 14th GRETSI Symposium on Signal and Image Processing, Juan-les-Pins, France, pp. 507-510, Sept. 13-16, 1993.
• [C2] C. B. Papadias and D. T. M. Slock, “On the Convergence of Normalized Constant Modulus Algorithms for Blind Equalization,” Proc. DSP International Conference on Digital Signal Processing, Nicosia, Cyprus, pp. 245-250, July 14-16, 1993.
• [C3] C. B. Papadias and D. T. M. Slock, “New Adaptive Blind Equalization Algorithms for Constant Modulus Constellations,” International Conference on Acoustics, Speech and Signal Processing (ICASSP-94), volume 3, pp. 321-324, Adelaide, Australia, April 19-22, 1994.
• [C4] C. B. Papadias and D. T. M. Slock, “A Bilinear Approach to Constant Modulus Blind Equalization,” ATHOS, ESPRIT Basic Research Working Group # 6620, System Identification and High Order Statistics, I3S, CNRS, Sophia Antipolis, September 20-21, 1993.
• [C5] C. B. Papadias and D. T. M. Slock, “Towards Globally Convergent Blind Equalization of Constant Modulus Signals: a Bilinear Approach,” EUSIPCO ’94.
• [C6] D. T. M. Slock and C. B. Papadias, “Blind Fractionally-Spaced Equalization Based on Cyclostationarity,” IEEE/VTS 44th Vehicular Technology Conference (VTC-94), Stockholm, Sweden, June 1994.
• [C7] C. B. Papadias and D. T. M. Slock, “On the Decision-Directed Equalization of Constant Modulus Signals,” 28th Annual Asilomar Conference on Signals, Systems and Computers, Oct. 31-Nov. 2, 1994, Pacific Grove, California.
• [C8] D. T. M. Slock and C. B. Papadias, “Blind Radio Channel Identification and Equalization Based on Oversampling and/or Antenna Arrays,” COST 229 Workshop, Vigo, Spain, 1994.
• [C9] D. T. M. Slock and C. B. Papadias, “Further Results on Blind Identification and Equalization of Multiple FIR Channels,” in Proc. Int’l Conference on Acoustics, Speech and Signal Processing, Detroit, Michigan, May 8-12, 1995.
• [C10] C. B. Papadias and A. Paulraj, “Decision-Feedback Equalization and Identification nof Linear Channels Using Blind Algorithms of the Bussgang Type,” 29th Annual Asilomar Conference on Signals, Systems and Computers, Oct. 30-Nov. 1, 1995, Pacific Grove, California.
• [C11] C. B. Papadias and A. Paulraj, “A Space-Time Constant Modulus Algorithm for SDMA Systems,” IEEE/VTS 46th Vehicular Technology Conference (VTC-96), April 28-May 1, 1996, Atlanta, GA, USA.
• [C12] M. C. Vanderveen, B. C. Ng, C. Papadias, A. Paulraj, “Joint Angle and Delay Estimation (JADE) for Signals in Multipath Environments,” 30th Asilomar Conference on Signals, Systems, and Computers, Nov. 3-6, Pacific Grove, CA.
• [C13] C. B. Papadias, “ On the Existence of Undesirable Global Minima of Godard Equalizers,” International Conference on Acoustics, Speech, and Signal Processing (ICASSP-97), pp. 3941-3944, May 1997, Munich, Germany.
• [C14] V. U. Reddy, C. Papadias and A. Paulraj, “Second-Order Blind Identifiability of Certain Classes of Multipath Channels Using Antenna Arrays,” International Conference on Acoustics, Speech, and Signal Processing (ICASSP-97), pp. 3465-3468, May 1997, Munich, Germany.
• [C15] A. Paulraj and C. Papadias, “Space-Time Signal Processing forWireless Communications: a Survey,” SPAWC Workshop, Paris, April 1997.
• [C16] C. B. Papadias and A. J. Paulraj, “Blind separation of independent co-channel signals,” 13th International Conference on Digital Signal Processing, pp. 139-142, July 2-4, Santorini, Greece.
• [C17] C. B. Papadias and A. J. Paulraj, “On the Blind Separability of Multiple User Signals in the Presence of Delay Spread,” 31st Asilomar Conference on Signals, Systems, and Computers, Nov. 2-5, 1997.
• [C18] D. Gesbert, C. B. Papadias and A. J. Paulraj, “Blind Equalization of Polyphase FIR Channels. AWhitening Approach ,” 31st Asilomar Conference on Signals, Systems, and Computers, Nov. 2-5, 1997.
• [C19] C. B. Papadias, “Second-Order-Based Blind Separation of Multiple User Signals Transmitted through FIR MIMO Channels,” International Conference on Telecommunications (ICT-98), to be held in Chalkidiki, Greece, June 22-25, 1997.
• [C20] C. Papadias, H. Huang, L. Mailaender, “Adaptive Multi-User Detection of Fading CDMA Channels Using Antenna Arrays,” 32nd Asilomar ’98 Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov. 1-4, 1998.
• [C21] C. Papadias and M. Rupp, “Performance Analysis of Unbiased Finite-Length DFE Receivers,” 32nd Asilomar ’98 Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov. 1-4, 1998.
• [C22] C. Papadias, D. Gesbert, A. Paulraj, “Direct Second Order Blind Equalization of Polyphase Channels Based on a Decorrelation Criterion,” International Conference on Acoustics, Speech, and Signal Processing (ICASSP’99), Phoenix, AZ, May 15-19, 1999.
• [C23] H. Huang and C. Papadias, “Minimum Mean-Squared Error Space-Time Multiuser Receivers for Wireless CDMA Systems,” Global Conference on Communications (GLOBECOM’98), Sydney, Australia, Nov. 8-12, 1998.
• [C24] H. Huang and C. Papadias, “Linear Space-Time Multiuser Receivers for Wireless CDMA Systems,” 9th IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC ’98), Boston, MA, Sept. 8-11, 1999.
• [C25] J. Chen, C. Papadias, J. Foschini, “Dynamic Signature Assignment for Reverse-Link CDMA Systems,” International Conference on Communications (ICC-99),Vancouver, Canada, June 6-10, 1999.
• [C26] B. Hochwald, T. Marzetta, C. Papadias, “A Novel Space-Time Spreading Scheme for Wireless CDMA Systems,” 37th annual Allerton Conference on Communication, Control, and Computing, Urbana, Illinois, Sept. 22-24, 1999.
• [C27] C. Papadias, “On the Spectral Efficiency of Space-Time Spreading Schemes for Multiple Antenna CDMA Systems,” 33rd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Oct. 24-27, 1999.
• [C28] C. Papadias, B. Hochwald, T. Marzetta, M. Buehrer, R. Soni, “Space-Time Spreading for CDMA Systems,” 6th workshop on Smart Antennas in Wireless Mobile Communications, Stanford University, Stanford, CA, July 22-23, 1999.
• [C29] C. Papadias, “Blind Signal Separation in Narrow Band BLAST Systems,” CISS-2000 Conference, Princeton, NJ, March 15-17, 2000.
• [C30] C. Papadias, “A Multi-User Kurtosis Algorithm for Blind Source Separation,” International Conference on Acoustics, Speech, and Signal Processing (ICASSP ’2000), Istanbul, Turkey, June 5-9, 2000.
• [C31] C. Papadias, “Blind Source Separation Based on Multi-User Kurtosis Criteria,” International Symposium on Information Theory (ISIT ’2000), Sorrento, Italy, June 25-30, 2000.
• [C32] C. Papadias, “Globally Convergent Algorithms for Blind Source Separation,” X European Signal Processing Conference (EUSIPCO-2000), Tampere, Finland, Sept. 4-8, 2000.
• [C33] A. Lozano, C. Papadias, “Space-Time Receiver for Wideband BLAST in Rich- Scattering Wireless Channels,” VTC’2000 Conference, Tokyo, Japan, May 2000.
• [C34] H. Huang, C. Papadias, A. Lozano, “Spectral Efficiency of CDMA Systems with Transmit and Receive Antenna Arrays,” WCNC 2000 Conference, September 23-28, 2000, Chicago, Illinois.
• [C35] C. Papadias, “New Processing Techniques for Wide-Band BLAST Systems,” 33rd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Oct. 29 - Nov. 1, 2000.
• [C36] C. Papadias and J. Foschini, “Open-Loop Transmit Diversity Technique for Systems Employing Four Transmitter Antennas,” International Conference on Acoustics,
  Speech, and Signal Processing (ICASSP-2001), special session on space-time coding, Salt Lake city, May 7-11, 2001.
• [C37] D. Samardzija, C. Papadias, and R. Valenzuela, “Experimental Evaluation of Unsupervised Channel Deconvolution for Wireless Multiple-Transmitter/Multiple- Receiver Systems,” IEEE Globecom 2001 Conference, San Antonio, Texas, USA, Nov. 25-29, 2001.
• [C38] N. Sharma and C. Papadias, “Improved Quasi-Orthogonal Codes,” IEEE Wireless Communications and Networking Conference (WCNC 2002), Orlando, FL, USA, 17-21, March, 2002.
• [C39] N. Sharma and C. Papadias, “Improved Quasi-Orthogonal Codes Through Constellation Rotation,” 2002 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2002), Orlando, Florida, USA, May 13-17, 2002.
• [C40] F. Lazarakis, A. Alexiou, S. Buljore, C. Papadias, M. Lamarca, K. Vlahodimitropoulos, C. Borja, J. Kruys, “The IST FITNESS project: Interoperability of UMTS and HIPERLAN/2 with Re-configurable Multiple Receive Multiple Transmit Antennas,” IST Mobile and Wireless Telecommunications Summit 2002, Thessaloniki, Greece, June 16-19, 2002.
• [C41] A.M.Kuzminskiy, C. Papadias, “Linear Filtering Versus ML-based Detection for Smart Antennas in OFDM under Interference Limited Scenarios,” in Proc. Wireless World Research Forum, Tempe, March 2002.
• [C42] A.M.Kuzminskiy, C. B. Papadias, “Asynchronous Interference Cancellation with an Antenna Array,” in Proc. IEEE 13th PIMRC, Lisbon, Sept. 2002.
• [C43] A.M.Kuzminskiy, C. B. Papadias, “Re-configurable Semi-blind Cancellation of Asynchronous Interference with an Antenna Array,” 2003 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2003), Hong-Kong, April 6-10, 2003. Presented also at IEEE Workshop on Neural Networks for Signal Processing, Toulouse, France, Sept. 2003.
• [C44] N. Sharma and C. B. Papadias, “Full Rate Full Diversity Linear Quasi-Orthogonal Space-Time Codes for Any Transmit Antennas,” 41st annual Allerton Conference on Communication, Control, and Computing, Urbana, Illinois, Oct. 1-3, 2003.
• [C45] S. Mukherjee, D. Avidor, J. Ling, and C. Papadias, “The Proportional Fair Scheduler in a Cellular Wireless Environment,” 10th Wireless World Research Forum Meeting,” Oct. 27-28, 2003, New York, USA.
• [C46] C. Papadias and A. Kuzminskiy, “Blind Source Separation with Randomized Gram-Shmidt Orthogonalization for Short-Burst Systems,” to appear, 2004 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2004), Montreal, Quebec, Canada, May 17-21, 2004.
• [C47] Y.-N. Lee, H.-H. Chen, C.-K. Wen, J.-T. Chen, C. Papadias, “Spectrum efficiency of MIMO multiple-access wireless systems exploring only spatial correlations: an asymptotic approach,” 2004 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2004), Montreal, Quebec, Canada, May 17-21, 2004.
• [C48] N. Sharma and C. B. Papadias, “High Rate Quasi-Orthogonal Space-Time Codes for any Transmit Antennas,” CISS-2004 Conference, Princeton, NJ, March 17-19, 2004.
• [C49] D. Avidor, J. Ling, and C. Papadias, “Jointly Opportunisitic Beamforming and Scheduling for Downlink Packet Access,” International Conference on Communications (ICC-2004), Paris, France, June 20-24, 2004.
• [C50] C.-K. Wen, Y.-N. Lee, J.-T. Chen, C. Papadias, and P. Ting, “Performance Analysis of MIMO Wireless Systems with Sparially-Correlated Channels - Part I: Joint Decoding,” International Conference on Communications (ICC-2004), Paris, France, June 20-24, 2004.
• [C51] Y.-N. Lee, C.-K. Wen, J.-T. Chen, C. Papadias, and P. Ting, “Asymptotic Spectral Efficiency of MIMO Wireless Multiple-Access Wireless Systems Exploring Only Channel Spatial Correlations,” International Conference on Communications (ICC-2004), Paris, France, June 20-24, 2004.
• [C52] C.-K. Wen, Y.-N. Lee, J.-T. Chen, C. Papadias, and P. Ting, “Performance Analysis of MIMO Wireless Systems with Sparially-Correlated Channels – Part II: Separate Decoding,” International Conference on Communications (ICC-2004), Paris, France, June 20-24, 2004.
• [C53] A. Alexiou, D. Avidor, P. Bosch, S. Das, P. Gupta, B. Hochwald, T. E. Klein, J. Ling, A. Lozano, T. Marzetta, S. Mukherjee, S. Mullender, C. Papadias, R. Valenzuela, H. Viswanathan , ”Duplexing, Resource Allocation and Inter-Cell Coordination-Design Recommendations for Next Generation Systems”, WWRF11th meeting, Oslo, June 2004.
• [C54] D. Avidor, J. Ling, S. Mukherjee, C. Papadias, “On some properties of the proportional fair scheduling policy,” IEEE PIMRC, Sept. 2004.
• [C55] D. Avidor, A. Basu, D. Lin, G. Narlikar, C. Papadias, L. Yagati, “Multihop Wireless Backhaul for Ubiquitous Data Access,” SIGCOMM 2004, Portland, Oregon, Aug. 30 - Sept. 3, 2004.
• [C56] D. Samardzija, A. Lozano and C. Papadias, “Experimental Validation of MIMO Multiuser Detection for UMTS High-Speed Downlink Packet Access,” IEEE Globecom 2004, Dallas, Texas, Nov. 29 - Dec. 3, 2004.
• [C57] A. Kuzminskiy, F. Mullany and C. Papadias, “Semi-blind Channel Estimation at the Receiver for Steered-STS Transmit Antenna Architecture in cdma2000,” ICASSP 2005, Philadeplhia, PA, March 20-23, 2005.
• [C58] A. Kuzminskiy, H. R. Karimi and C. Papadias, “Downlink SDMA for legacy IEEE 802.11a/g mobile stations: Acknowledgement recovery and channel estimation,” The Sixth IEEE International Workshop on Signal Processing Processing Advances for Wireless Communications (SPAWC 2005), New York, NY, pp. 216 - 220, June 5-8, 2005.
• [C59] A. Kuzminskiy, H. R. Karimi and C. Papadias, “Alternating Time-offset Downlink SDMA for Legacy IEEE 802.11a/g Mobile Stations,” The 13th European Signal Processing Conference (EUSIPCO 2005), Antalya, Turkey, Sept. 4-8, 2005.
• [C60] A. M. Kuzminskiy, H. R. Karimi, D. Morgan, C. B. Papadias, D. Avidor, and J.Ling, “Downlink SDMA for IEEE 802.11a/g: A means for improving legacy mobile throughput using a multi-antenna access point,” Proc. PIMRC, Berlin, Sept. 2005.
• [C61] M. Vemula, D. Avidor, J. Ling and C. Papadias, “Inter-Cell Coordination, Opportunistic Beamforming and Scheduling,” to appear, 2006 IEEE International Conference on Communications (ICC ‘2006), Istanbul, Turkey, June 11-15, 2006.
• [C62] J. Ling, D. Chizhik, U. Tureli, C. Papadias, “Performance of Linear Prediction for Wireless Schedules Downlink Systems,” to appear, 2006 IEEE International Conference on Communications (ICC ‘2006), Istanbul, Turkey, June 11-15, 2006.
• [C63] C. Rizogiannis, E. Kofidis, C. B. Papadias and S. Theodoridis, “Semi-Blind Maximum Likelihood Joint Channel Estimation / Data Detection for MIMO fading channels,” to appear, The Seventh IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2006), Cannes, France, July 2-5, 2006.
• [C64] A. Alexiou, K. K. Leung, C. Papadias, A. Valkanas, “MEMBRANE: Multi-Element Multihop Backhaul Reconfigurable Antenna Network,” to appear, The 15th IST Mobile & Wireless Communications Summit, Mykonos, Greece, June 4-8, 2006.

Book chapters

• [B1] A. Paulraj and C. B. Papadias, “Array Processing for Mobile Communications,” in Handbook on Signal Processing, CRC Press, 1997.
• [B2] A. Paulraj, C. B. Papadias, V. U. Reddy and A. van der Veen, “Space-Time Blind Signal Processing for Wireless Communication Systems: Recent Advances and Practical Considerations,” in Wireless Communications: a Signal Processing Perspective, G. Wornell and H. V. Poor, Eds., Prentice Hall, 1998.
• [B3] A. Paulraj, D. Gesbert, and C. B. Papadias, “Antenna Arrays in Mobile Communications,” in Encyclopedia of Electrical and Electronics Engineering, John G. Webster, Editor, 1999.
• [B4] C. Papadias, “Blind Separation of Independent Sources Based on Multiuser Kurtosis Optimization Criteria,” chapter 4in Unsupervised Adaptive Filtering, vol. II, Simon Haykin, Editor, John Wiley & Sons, Inc., publisher, 1999.
• [B5] C. Papadias, “Multiple Antenna Transceivers for Wireless Communications: a Capacity Perspective,” Wiley Encyclopedia of Telecommunications, John G. Proakis, Editor, John Wiley & Sons, Hoboken, NJ, 2003.

Course notes

• [N1] A. Paulraj, C. B. Papadias et al., “Antenna Array Signal Processing with Applications to Mobile Communications,” short course given at the “Second Workshop on Smart Antennas in Wireless Mobile Communications”, Stanford University, July 22, 1995.
• [N2] A. Paulraj, C. B. Papadias et al., “Space-Time Processing in Wireless Communications,” short course and paper, given at the “Third Workshop on Smart Antennas in Wireless Mobile Communications”, Stanford University, July 26, 1996.

PATENTS

Patents awarded

• [P1] H. Huang, L. Mailaender, C. Papadias, “MMSE Detectors for CDMA Systems,” U.S. patent # 6,301,293, issued Oct. 9, 2001.
• [P2] B. Hochwald, T. Marzetta, C. Papadias, “Space-Time Spreading Method of CDMA Wireless Communication”, U.S. Patent # 6,452,916, issued Sept. 17, 2002.
• [P3] C. Papadias, “Method for Blind Separation of Independent Source Signals,” U.S. Patent # 6,654,719, issued Nov. 25, 2003.
• [P4] C. Papadias, M. Tsangaris, G. Vannucci, “A technique and an apparatus to detect the presence of mobile terminals,” U.S. Patent Number # 6,907,252, issued June 14, 2005.
• [P5] X. Li, H. Viswanathan, C. Papadias, “Orthogonal Frequency Division Multiplexing Transmit Diversity System For Frequency-Selective Fading Channels,” U.S. Patent Number # 7,020,072, issued March 28, 2006
• [P6] J. T. Chen, C. Papadias, J. Foschini, “Code Assignment in a CDMA Wireless System,” U.S. Patent Number # 7,035,238, issued April 25, 2006.
• [P7] C. Papadias and J. Foschini, “Open-loop diversity technique for systems employing four transmitter antennas,” U.S. Patent Number # 7,050,510, issued May 23, 2006. .

Patents pending

• [PP1] J. Foschini, C. Papadias, “Wireless communication system using multi-element antenna having a space-time architecture,” filed with the US Patent Office, July 2, 2001.
• [PP2] C. Papadias and N. Sharma, “Improved quasi-orthogonal space-time codes,” filed with the US Patent Office, March 15, 2002.
• PP3] A. Kuzminskiy and C. Papadias, “A receiver of digital data bursts comprising an antenna array, and a method of receiving,” filed with the US Patent Office, Sept. 26, 2002.
• [PP4] D. Avidor, J. Ling and C. Papadias, “Opportunistic beamforming and scheduling of users in a communication system,” filed with US Patent Office, Nov. 11, 2003.