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Department: Any ÅAU / Department of Information Technologies UTU / Department of Information Technology UTU / Department of Mathematics and Statistics UTU / Turku School of Economics, Institute of Information Systems Sciences

Research Unit: Any Algorithmics and Computational Intelligence Group (ACI) Biomathematics Research Unit (BIOMATH) Communication Systems (ComSys) Computational Biomodeling Laboratory (Combio Lab) Data Mining and Knowledge Management Laboratory Distributed Systems Laboratory (DS Lab) Embedded Computer and Electronic Systems (ECES) Embedded Systems Laboratory (ESLAB) FUNDIM, Fundamentals of Computing and Discrete Mathematics Institute for Advanced Management Systems Research (IAMSR) Learning and Reasoning Lab Software Construction Laboratorium Software Development Laboratory (SwDev) Software Engineering Laboratory (SE Lab) Turku BioNLP Group Turku Optimization Group (TOpGroup) UTU Information Systems Science (ISS)

Publication type: Any Monographs Edited books Edited special issues of journals Edited proceedings Articles in journals Articles in proceedings Chapters in edited books Ph.D. thesis Lic. thesis Technical reports

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Articles in journals (4):

• Roope Vehkalahti, The Coding Gain of Real Matrix Lattices: Bounds and Existence Results. IEEE Transactions on Information Theory 56, 4359 – 4366 , 2010.
• Hsiao-feng (Francis) Lu, Roope Vehkalahti, Camilla Hollanti, Jyrki Lahtonen, Yi Hong, Emanuele Viterbo, New Space-Time Code Constructions for Two-User Multiple Access Channels. IEEE Journal of Selected Topis on Signal Processing: Special Issue on Managing Complexity in Multiuser MIMO Systems , 2009.
• Roope Vehkalahti, Camilla Hollanti, Jyrki Lahtonen, Kalle Ranto, On the Densest MIMO lattices from Cyclic Division Algebras. IEEE Transactions on Information Theory , 2009.
• Jyrki Lahtonen, Kalle Ranto, Roope Vehkalahti, 3-Designs from All Z4-Goethals-Like Codes with Block Size 7 and 8. Finite Fields and Their Applications 13(4), 815–827, 2007.

Articles in proceedings (9):

• Toni Ernvall, Roope Vehkalahti, Construction of MIMO MAC Codes Achieving the Pigeon Hole Bound. In: Pramod Viswanath (Ed.), 2012 IEEE International Symposium on Information Theory Proceedings, 21–25, IEEE, 2012.
• Camilla Hollanti, Hsiao-feng (Francis) Lu, Roope Vehkalahti, An Algebraic Tool for Obtaining Conditional Non-Vanishing Determinants. In: Proceedings of 2009 IEEE International Symposium on Information Theory, 2009.
• Roope Vehkalahti, Some Properties of Alamouti-Like Miso Codes. In: Proc. 2009 IEEE Int. Symp. Inform. Theory, Seoul, South Korea, 2009.
• Roope Vehkalahti, Some Simple Observations On Lattice Codes. In: Proc. 2009 IEEE Inf. Theory Workshop, Taormina, Italy, 2009.
• Camilla Hollanti, Jyrki Lahtonen, Kalle Ranto, Roope Vehkalahti, Emanuele Viterbo, On the Algebraic Structure of the Silver Code: A 2x2 Perfect Space-Time Code with Non-Vanishing Determinant. In: Proceedings of the 2008 IEEE Information Theory Workshop (ITW), IEEE, 91-94, 2008.
• Jyrki Lahtonen, Roope Vehkalahti, Dense MIMO Matrix Lattices a Meeting Point for Class Field Theory and Invariant Theory. In: The 17th Symposium on Applied algebra, Algebraic algorithms, and Error Correcting Codes (AAECC, Lecture Notes in Computer Science, 247–256, Springer, 2007.
• Roope Vehkalahti, Constructing optimal division algebras for space-time coding. In: Proceedings of the 2007 IEEE Information Theory Workshop on Information Theory for Wireless Networks, Jul 2007, 2007.
• Camilla Hollanti, Jyrki Lahtonen, Kalle Ranto, Roope Vehkalahti, Optimal Matrix Lattices for MIMO Codes from Division Algebras. In: Proceedings of 2006 IEEE International Symposium on Information Theory, 783-787, 2006.
• Jyrki Lahtonen, Kalle Ranto, Roope Vehkalahti, 3-Designs from Z4-Goethals-Like Codes and Variants of Cyclotomic Polynomials. In: Proceedings of the International Workshop on Coding and Cryptography WCC'2005 , 425-434, 2005.

Ph.D. thesis (1):

• Roope Vehkalahti, Class Field Theoretic Methods in the Design of Lattice Signal Constellations. TUCS Dissertations 100. Turku Centre for Computer Science, 2008.