Welcome to my personal website; thank you for your interest!
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In Greece everyone calls me Lefteris.
I have recently completed my Ph.D. under the advise of Prof. Nikos D. Sidiropoulos
and joined the group of Prof. Erik G. Larsson as a postdoctoral researcher.

Education

• Doctor of Philosophy, Electronic & Computer Engineering, Technical University of Crete, Greece, 2004 - 2008

• Master of Science, Communications Engineering, Technical University of Munich, Germany, 2001 – 2003

• Diploma, Electrical & Computer Engineering, Aristotle University of Thessaloniki, Greece, 1996 – 2001

Research Interests

• Signal processing for MIMO communications

• Cross-layer network optimization problems

• Resource allocation for wireless networks

• Cooperative and opportunistic communications

• Convex optimization/relaxation methods and applications

• Cognitive radio

Publications

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Journals

4. E. Karipidis, N. D. Sidiropoulos, and Z.-Q. (Tom) Luo, "Quality of service and max-min fair transmit beamforming to multiple cochannel multicast groups," IEEE Transactions on Signal Processing, vol. 56, no. 3, pp. 1268-1279, Mar. 2008

3. E. Karipidis, N. D. Sidiropoulos, and Z.-Q. (Tom) Luo, "Far-field multicast beamforming for uniform linear antenna arrays," IEEE Transactions on Signal Processing, vol. 55, no. 10, pp. 4916-4927, Oct. 2007

2. E. Karipidis, N. D. Sidiropoulos, A. Leshem, Li Youming, R. Tarafi, and M. Ouzzif, "Crosstalk models for short VDSL2 lines from measured 30 MHz data," EURASIP Journal on Applied Signal Processing, special issue on Advanced Signal Processing for Digital Subscriber Loops, vol. 2006, Article ID 85859

1. E. Karipidis, N. D. Sidiropoulos, A. Leshem, and Li Youming, "Experimental evaluation of capacity statistics for short VDSL loops," IEEE Transactions on Communications, vol. 53, no. 7, pp. 1119-1122, Jul. 2005

Conferences

5. E. Karipidis, N. D. Sidiropoulos, and L. Tassiulas, "Joint QoS multicast power / admission control and base station assignment: A geometric programming approach," 5th IEEE Workshop on Sensor Array and Multi-Channel Signal Processing (SAM), Darmstadt, Germany, Jul. 21-23, 2008, pp. 155-159
   

4. E. Karipidis, N. D. Sidiropoulos, and Z.-Q. (Tom) Luo, "Convex transmit beamforming for downlink multicasting to multiple co-channel groups," in the Proceedings of the 31st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Toulouse, France, May 14-19, 2006, pp. 973-976

3. E. Karipidis, N. D. Sidiropoulos, and Z.-Q. (Tom) Luo, "Transmit beamforming to multiple co-channel multicast groups," in the Proceedings of the 1st IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), Puerto Vallarta, Mexico, Dec. 12-14, 2005, pp. 109-112

2. E. Karipidis, N. D. Sidiropoulos, A. Leshem, and Li Youming, "Capacity statistics for short DSL loops from measured 30 MHz channel data," in the Proceedings of the 6th IEEE International Workshop on Signal Processing Advances for Wireless Communications (SPAWC), New York, USA, Jun. 5-8, 2005, pp. 174-178

1. G. Auer and E. Karipidis, "Pilot-symbol aided channel estimation for OFDM: a separated approach for smoothing and interpolation," in the Proceedings of the 40th IEEE International Conference on Communications (ICC), Seoul, Korea, May 16-20, 2005, pp. 2173-2178

Research & Professional Experience

• 10/2008 - today, Communication Systems Division, Dept. of EE, University of Linköping, Linköping, Sweden
  
  Postdoctoral reasearcher
  
  
• 01/2008 – 09/2008, Research Committee, Technical University of Crete, Chania, Greece
  
  “Testbed implementations”; project: “Cooperative and Opportunistic Communications in Wireless Networks (COOPCOM)” (FET Open); work resulted in deliverable D3.2

• 12/2005 – 09/2008, Research Committee, Technical University of Crete, Chania, Greece
  
  "Transmit beamforming to multiple co-channel multicast groups"; project: "Resource management and security in broadband wireless networks" (GSRT - Reinforcement Programme of Human Research Manpower "PENED"); work resulted in journal papers 3, 4 and conference paper 5

• 01/2005 – 12/2005, Telecommunications Systems Institute, Technical University of Crete, Chania, Greece
  
  "Development of specialized convex optimization algorithms and implementation of respective simulations"; project: "Multiuser Downlink Beamforming and Scheduling for Broadband Wireless Access Beyond 3G" (GSRT); work resulted in conference papers 3, 4

• 03/2004 – 11/2005, Telecommunications Systems Institute, Technical University of Crete, Chania, Greece
  
  "Development and simulation of algorithms for vectored DSL channel modeling and transmission"; project: "Ultra High Bit Rate over Copper Technologies for BROADband Multiservice Access (U-BROAD)" (FP6 - STREP); work resulted in journal papers 1, 2 and conference paper 2

• 03/2003 – 11/2003, Wireless Solution Lab, DoCoMo Communication Laboratories Europe, Munich, Germany
  
  "Orthogonal Frequency Division Multiplexing (OFDM) channel estimation based on reduced rank processing"; Master thesis, supervisors: Dr. Gunther Auer and Prof. Wolfgang Utschick, work resulted in conference paper 1

• 12/2002 – 02/2003, Wireless Solution Lab, DoCoMo Communication Laboratories Europe, Munich, Germany
  
  "Extension of a simulation platform, based on Java, to simulate the effects of cellular interference of a multi-carrier based mobile communications system"; internship, work acknowledged in journal paper: G. Auer et al, “Analysis of cellular interference for MC-CDMA and its impact on channel estimation,” European Transactions on Telecommunications, special issue on multi-carrier spread-spectrum, May/June 2004, vol. 15, no. 3, pp. 173-184

• 02/2002 – 10/2002, Information & Communication Mobile Networks Product Generation SP RC NA, SIEMENS AG, Munich, Germany
  
  "Deployment, installation and configuration of the Linux-based Distributed Network Architecture Experimental System (TIPEX): Radio Access Network emulation based on IPv6 and Mobile IPv6 principles"; internship

Teaching Experience

Teaching Assistant (407/80), Department of Electronic & Computer Engineering, Technical University of Crete, Greece

• Spring 2008, ΤΗL 502: Statistical Signal Processing for Telecommunications (8th semester)

• Fall 2007, ΤΗL 301: Telecommunication Systems Ι (5th semester)

• Spring 2007, ΤΗL 311: Telecommunication Systems II (6th semester)

• Fall 2006, ΤΗL 301: Telecommunication Systems Ι (5th semester)

• Fall 2005, ΤΗL 301: Telecommunication Systems Ι (5th semester)

• Spring 2005, ΤΗL 502: Statistical Signal Processing for Telecommunications (8th semester)

• Fall 2004, ΤΗL 301: Telecommunication Systems Ι (5th semester)

• Spring 2004, ΤΗL 302: Digital Telecommunication Systems Ι (6th semester)

Professional Activities

• IEEE Graduate Student Member, Signal Processing and Communications Societies, 2005 -2008

• Reviewer, IEEE Transactions on Signal Processing, IEEE Transactions on Communications, IEEE Signal Processing Letters,
  EURASIP Journal on Applied Signal Processing, IEEE ICASSP, IEEE GLOBECOM, IEEE ICC, IEEE SPAWC, IEEE/ITG WSA

• Member, Technical Chamber of Greece, since 2004

• Graduate students’ representative, General Assembly and Graduate Studies Committee,  Dept. ECE, TUC, Fall 2004 - Spring 2007

• Secretary, Graduate students’ union, Dept. ECE, TUC, Fall 2005 - Spring 2007

Languages

• English, excellent (Cambridge Proficiency 1995, TOEFL 2001)

• French,  good (Certificate 1997)

• German,  elementary

• Swedish, novice

• Greek,  native