Olav Tirkkonen, Professor
Informaatio- ja tietoliikennetekniikan laitos
Sähkötekniikan
korkeakoulu
Aalto-yliopisto
Department of Information and Communications Engineering
School of Electrical Engineering
Aalto University
Bio:
Olav Tirkkonen is full professor in communication theory at the
Department of Communications and Networking in Aalto University,
Finland, where he has held a faculty position since August 2006. He
received his M.Sc. and Ph.D. degrees in theoretical physics from
Helsinki University of Technology in 1990 and 1994, respectively.
Between 1994 and 1999 he held post-doctoral positions at the
University of British Columbia, Vancouver, Canada, and the Nordic
Institute for Theoretical Physics, Copenhagen, Denmark. From 1999 to
2010 he was with Nokia Research Center (NRC), Helsinki, Finland, most
recently acting as Research Fellow. In 2016-2017 he was Visiting
Associate Professor at Cornell University, Ithaca, NY, USA. He has
published some 300 papers,is coauthor of the book "Multiantenna
transceiver techniques for 3G and beyond", and is the inventor of some
85 families of patents and patent applications which include 1% of all
patents declared essential for the first standardized version of 4G
LTE. He is a fellow of IEEE, and of the Asia-Pacific Artificial Intelligence
Association. He served as General Chair of 2022 IEEE International
Symposium on Information Theory, and is a member of the Executive
Editorial Committee of IEEE Transactions on Wireless Communications.
Research
The research interests of the communication theory group
are in wireless networks, physical layer processing, coding theory and
quantum information processing. The development
of wireless systems keeps opening up new frontiers and enabling the
use of methods of increasing sophistication to optimize system
performance on all layers in Radio Access Networks (RANs).
Current topics include
- 6G large scale and cell-free MIMO, massive and ultra-reliable
machine-type communications
- Machine learning for wireless networks: channel charting, CSI localization, and reinforcement learning
- Coding on unitary group, Grassmann and covariance matrix manifolds
- Quantum communication and computation
Communications Theory Research Group
Senior Researchers
Senior Researchers, Alumni
Post-docs
PhD students
Graduated PhDs
- Mohsen Amidzadeh, defended 2024, now at Aalto School of Science
- Jari Lietzen, defended 2023, now at Aalto ELEC
- Nicolas Malm, defended 2022, now in industry.
- Bikramjit Singh, defended 2021, now in industry.
- Liang Zhou, defended 2020, now in industry.
- Sofonias Hailu, defended 2019, now in industry.
- Christopher Boyd, defended 2019, now in industry.
- Junquan Deng, defended 2018, now at NUDT, Nanjing, China.
- Joonas Paakkonen (co-supervisor Camilla Hollanti),
defended 2018, now at Dalarna University, Sweden
- Sergio Lembo, defended 2017, now at VTT.
- Furqan Ahmed , defended 2016, now in industry.
- Udesh Oruthota, defended 2016, now at Sri Lanka
Technological Campus.
- Athul Prasad , defended 2015, now in industy .
- Renaud-Alexandre Pitaval, defended 2014, now in industy .
- Lu Wei, defended 2013, now at Texas Tech University, USA.
- Helka-Liina Maattanen, defended 2012, now in industy .
- Chia-Hao Yu, defended 2012, now in industy .
Visiting address
Department of Information and Communications Engineering, Maarintie 8, 02150 Espoo, Finland
Directions via Google Maps
Contact address
Department of Information and Communications Engineering, PO box 15500, FI-00076 Aalto University, Finland
Email: firstname dot lastname at aalto dot fi
Publications
Full list of publications (April 2023)
List of publications in Scholar
Some recent journal papers:
-
P. Kazemi, H. Al-Tous, T. Ponnada, C. Studer, and O. Tirkkonen,
Beam SNR Prediction Using Channel Charting,
IEEE Trans. Vehic. Tech., vol. 72, no. 10, pp. 13130-13145, Oct 2023.
- U. Singh, H. Al-Tous, O. Tirkkonen, M. Bhatnagar,
Performance Analysis of the STAR-RIS-Assisted Downlink NOMA
Communication System with MRC,
IEEE Commun. Lett., vol. 27, no. 7, pp. 1739--1742, July 2023.
- J. Liao, R. Vehkalahti, T. Pllaha, W. Han and O. Tirkkonen,
Modular CSI Quantization for FDD Massive MIMO Communication,
IEEE Trans. Wireless Commun., vol. 22, no. 12, pp. 8543--8558, Dec 2023.
- P. Ferrand, M. Guillaud, C. Studer and O. Tirkkonen,
Wireless Channel Charting: Theory, Practice, and Applications,
IEEE Commun. Mag., vol. 61, no. 6, pp. 124-130, June 2023.
- N. Malm, K. Ruttik and O. Tirkkonen,
Midhaul Performance Modelling Using Commodity Hardware C-RAN Testbed,
Wireless Personal Commun., vol. 131, pp. 1339-1363, May 2023.
- M. Amidzadeh, H. Al-Tous, G. Caire and O. Tirkkonen,
Caching in Cellular Networks Based on Multipoint Multicast Transmissions,
IEEE Trans. Wireless Commun., vol. 22, no. 4, pp. 2393-2408, April 2023.
- J. Lietzen and O. Tirkkonen,
Secret Key Generation Between Ambient Backscatter Devices,
IEEE Access, vol. 11, pp. 13456-13468, Feb 2023.
- L. Ribeiro, M. Leinonen, H. Al-Tous, O. Tirkkonen, M. Juntti,
Channel Charting Aided Pilot Reuse for Massive MIMO systems with Spatially Correlated Channels,
IEEE Open J. Commun. Soc., vol. 3, pp. 2390-2406, Dec 2022.
- T. Pllaha, O. Tirkkonen, R. Calderbank,
Binary subspace chirps,
IEEE Trans. Info. Theory , vol. 68, no. 12, pp. 7735-7752, Dec 2022.
- H. Song, T. Goldstein, X. You, C. Zhang, O. Tirkkonen, and C. Studer,
Joint Channel Estimation and Data Detection in Cell-Free Massive MU-MIMO Systems,
IEEE Trans. Wireless Commun. , vol. 21, no. 6, pp. 4068-4084, June 2022.
- S. R. Khosravirad, O. Tirkkonen, U. Parts, L. Zhou, D. Korpi, P. Baracca and M. A. Uusitalo,
Communications Survival Strategies for Industrial Wireless Control,
IEEE Network Mag. , vol. 36, no. 2, pp. 66-72, Feb 2022.
- G. Yang, Y. Liao, Y.-C. Liang, O. Tirkkonen, G. Wang, X. Zhu,
Reconfigurable Intelligent Surface Empowered Device-to-Device Communication Underlaying Cellular Networks,
IEEE Trans. Commun. , vol. 69, no. 11, pp. 7790-7805, Nov 2021.
- T. Pllaha, N. Rengaswamy, O. Tirkkonen, R. Calderbank,
Un-Weyl-ing the Clifford Hierarchy ,
Quantum , vol. 4, no. 370, 13 pp. Dec. 2020.
- J. Huang, C.-X. Wang, L. Bai, J. Sun, Y. Yang, J. Li, O. Tirkkonen, M. Zhou,
A big data enabled channel model for 5G wireless communication systems ,
IEEE Trans. Big Data , vol. 6, no. 2, pp. 211-222, June 2020.
- H. Al-Tous, T. Ponnada, C. Studer, O. Tirkkonen,
Multipoint Channel Charting Based Radio Resource Management for V2V Communications ,
EURASIP J. Wirelss Commun. and Networking , Article n. 132, 20 pp., June 2020.
- N. Malm, K. Ruttik, O. Tirkkonen,
Latency-aware Power Management in Software-defined Radios ,
Journal on Electrical and Computer Engineering. , Article ID 1854826, pp. 1-19, Feb. 2020.
- J. Deng, O. Tirkkonen, C. Studer,
MmWave Multiuser MIMO Precoding with Fixed Subarrays and Quantized Phase Shifters ,
IEEE Trans. Vehicular Techn. , vol. 68, no. 11, pp. 11132--11145, Nov 2019.
- C. Boyd, R.-A. Pitaval, O. Tirkkonen and R. Wichman,
Time-Frequency Localization Measures for Packets of
Orthogonally Multiplexed Signals ,
IEEE Trans. Commun. , vol. 67, no. 9, pp. 6374-6385, Sept 2019.
- N. Ermolova and O. Tirkkonen,
SIR Statistics and Average Rates in Cooperative Spectrum Sharing Networks ,
IEEE Trans. Vehicular Techn. , vol. 68, no. 8, pp. 8178--8182, Aug 2019.
- J. Paakkonen, A. Barreal, C. Hollanti and O. Tirkkonen,
Coded Caching Clusters with Device-to-Device Communications,
IEEE Trans. Mobile Computing, vol. 18, no. 2, pp. 264--275, Feb 2019.
- C. Boyd, R. Vehkalahti and O. Tirkkonen,
Interference Cancelling Codes for Ultra-Reliable Random Access,
Internat. J. on Wireless Information Networks., vol. 25, no. 4, pp. 422--433, Dec. 2018.
- C. Studer, S. Medjkouh, E. Gonultas, T. Goldstein, and O. Tirkkonen,
Channel Charting: Locating Users within the Radio Environment using Channel State Information,
IEEE Access, vol. 6, no 1, pp. 47682-47698, Dec 2018.
- B. Singh, O. Tirkkonen, Z. Li and M. Uusitalo,
Contention-Based Access for Ultra-Reliable Low Latency Uplink Transmissions,
IEEE Wireless Commun. Lett., vol. 7, no. 2, pp. 182-185, Apr 2018.
- R.-A. Pitaval, L. Wei, O. Tirkkonen and C. Hollanti,
Density of Spherically-Embedded Stiefel and Grassmann Codes,
IEEE Transactions on Information Theory, vol. 64, no. 1, pp. 225--248, Jan 2018.
- F. Ahmed, A. Dowhuszko and O. Tirkkonen,
Self-organizing
Algorithms for Interference Coordination in Small Cell Networks,
IEEE Transactions on Vehicular Technology,
vol. 66, no. 9, pp. 8333--8346, Sept 2017.
- N. Ermolova and O. Tirkkonen, Interference Analysis in Wireless
Networks Operating over Arbitrary Fading Channelswith Heterogeneous
Poisson Fields of Transmitters,
IEEE Signal Processing Letters,
vol. 24, no. 9, pp. 1388-1392, July 2017.
- J. Deng, O. Tirkkonen, R. Freij-Hollanti, T. Chen and N.
Nikaein, Resource Allocation and Interference Management for
Opportunistic Relaying in Integrated mmWave/sub-6GHz 5G Networks,
IEEE Communications Magazine,
vol. 55, no. 6, pp. 94-101, June 2017.
- L. Wei, R.-A. Pitaval, J. Corander and O. Tirkkonen,
From
Random Matrix Theory to Coding Theory: Volume of a Metric Ball in
Unitary Group,
IEEE Transactions on Information Theory,
vol. 63, no. 5, pp. 2814--2821, May 2017.
- J. Xu, X. Yan, Y. Zhu, J. Wang, Y. Yang,
X. Ge, G. Mao and O. Tirkkonen, Statistical Analysis
of Path Losses for Sectorized Wireless Netwoks,
IEEE Transactions on Communications,
vol. 65, no. 4, pp. 1828-1838, April 2017.
- Y. Beyene, R. Jantti, O. Tirkkonen, K. Ruttik, S. Iraji, A.
Larmo, T. Tirronen and J. Torsner, NB-IoT Technology Overview and
Experience from Cloud-RAN Implementation,
IEEE Wireless Communications,
vol. 24, no. 3, pp. 26-32, March 2017.
- R.-A. Pitaval, L. Wei, O. Tirkkonen and J. Corander,
Volume of metric balls in high-dimensional complex Grassmann manifolds,
IEEE Transactions on Information Theory, vol. 62, no. 9, pp. 5105-5116, Sept. 2016.
- J. Liu, G. Wu, S. Li and O. Tirkkonen,
On Fixed-point
Implementation of Log-MPA for SCMA Signals, IEEE Wireless
Communications Letters,
vol. 5, no. 3, pp. 324-327, June 2016.
- M. Bhatnagar, R. Mallik and O. Tirkkonen, Performance
Evaluation of Best-Path Selection in a Multihop Decode-and-Forward
Cooperative System, IEEE Transactions on Vehicular
Technology, vol. 65, no. 4, pp. 2722-2728, April 2016.
- N. Ermolova and O. Tirkkonen,
Using beta distributions for
modeling distances in random finite networks, IEEE Communications
Letters, vol. 20, no. 2, pp. 308-311, Feb 2016.
- U. Oruthota, F. Ahmed, O. Tirkkonen,
Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks,
Information , vol. 7, no.1, pp. 1--18, March 2016.
- F. Ahmed and O. Tirkkonen,
Simulated Annealing Variants for Self-organized Resource Allocation in Small Cell Networks,
Applied Soft Computing, vol. 38, pp. 762-770, Jan 2016.
- R.-A. Pitaval, O. Tirkkonen, R. Wichman, K. Pajukoski, E. Lahetkangas, E. Tiirola,
Full-duplex Self-backhauling for Small-cell 5G Networks ,
IEEE Wireless Communications, vol. 22, no. 5, pp. 83-89, Oct 2015.
- R.-A. Pitaval, W. Dai and O. Tirkkonen,
Convergence of Gradient Descent for Low-Rank Matrix Approximation ,
IEEE Transactions on Information Theory, vol. 61, no. 8, pp. 4451-4458, Aug. 2015.
- B. Singh, S. Hailu, K. Koufos, A. A. Dowhuszko, O. Tirkkonen, R. Jantti and R. Berry,
Coordination protocol for inter-operator spectrum sharing in co-primary 5G small cell networks , IEEE Communications Magazine, vol. 53, no. 7, pp. 34-40, July 2015.
- U. Oruthota and O. Tirkkonen,
Link Adaptation of Precoded MIMO-OFDMA System with I/Q Interference, IEEE Transactions on Communications, vol. 63, no. 3, pp. 780-790, March 2015.
- N. Ermolova and Olav Tirkkonen, Cumulative Distribution Function of Bivariate Gamma Distribution with Arbitrary Parameters, and Applications, IEEE Communications Letters, vol. 19, no. 2, pp. 167-170, Feb 2015.
- T. Chen, H. Zhang, X. Chen and O. Tirkkonen, SoftMobile: Control Evolution for Future Heterogeneous Mobile Networks, IEEE Wireless Communications, vol. 21, no. 6, pp. 70-78, Dec 2014.
- L. Wei, O. Tirkkonen and Y.-C. Liang, Multi-source Signal Detection with Arbitrary Noise Covariance, IEEE Transactions on Signal Processing, vol. 62, no. 22, pp. 5907-5918, Sept 2014.
- N. Ermolova and O. Tirkkonen, Laplace Transform of Product of Generalized Marcum Q, Bessel I, and Power Functions with Applications, IEEE Transactions on Signal Processing, vol. 62, no. 11, pp. 2938-2944, May 2014.
- N. Ermolova, Y. Zou, M. Valkama and Olav Tirkkonen, Error-rate Analysis of OFDM Radio Link over Mobile Rayleigh Channel under Multiple RF Impairments, IEEE Transactions on Vehicular Technology, vol. 63, no. 2, pp. 930-936, Feb 2014.
- R.-A. Pitaval and O. Tirkkonen, Joint Grassmann-Stiefel Quantization for MIMO product codebooks, IEEE Transactions on Wireless Communications, vol. 13, no. 1, pp. 210-222, Jan. 2014.
- N. Ermolova and O. Tirkkonen, Outage Probability Analysis in Fading Channels with Co-Channel Interference and Background Noise: eta-mu/eta-mu, eta-mu/kappa-mu, and kappa-mu/eta-mu scenarios, IEEE Transactions on Wireless Communications, vol. 13, no. 1, pp. 291-297, Jan. 2014.
- L. Wei, Z. Zheng, O. Tirkkonen and J. Hamalainen, On the Ergodic Mutual Information of Multiple Cluster Scattering MIMO Channels, IEEE Communications Letters, vol. 17, no. 9, pp. 1700 - 1703, Sept 2013.
- N. Ermolova and Olav Tirkkonen, Link Performance Bounds of MIMO Transmit Beamforming Systems Operating over Generalized Fading Channels, IEEE Communications Letters, vol. 17, no. 9, pp. 1696 - 1699, Sept 2013.
- L. Wei, P. Dharmawansa and O. Tirkkonen, Multiple Primary User Spectrum Sensing in the Low SNR Regime, IEEE Transactions on Communications, vol. 61, no. 5, pp. 1720-1731, May 2013.
- A. Prasad, O. Tirkkonen, P. Lunden, O. Yilmaz, L. Dalsgaard and C. Wijting, Energy Efficient Inter-Frequency Small Cell Discovery Techniques for LTE-Advanced Heterogeneous Network Deployments, IEEE Communications Magazine, vol. 51, no. 5, pp. 72-81, May 2013.
- M. R. Bhatnagar and O. Tirkkonen, PL Decoding in Double Differential Modulation Based Decode-and-Forward Cooperative System, IEEE Communications Letters, vol. 17, no 5, pp 860-863, May 2013.
- Z. Zheng, L. Wei, J. Hamalainen and O. Tirkkonen, A Blind Time-Reversal Detector in the Presence of Channel Correlation, IEEE Signal Processing Letters, vol. 20, no 5, pp. 459-462, May 2013.
- Z. Zheng, L. Wei, J. Hamalainen and O. Tirkkonen, Approximation to distribution of product of random variables using orthogonal polynomials for log-normal density, IEEE Communications Letters, vol. 16, pp. 2028-2031, Dec. 2012.
- N. Ermolova and O. Tirkkonen, Outage probability over composite eta-mu fading--shadowing radio channels, IET Communications, vol.6, pp. 1898-1902, 2012.
- U. Oruthota and O. Tirkkonen, SER/BER Expression for M-QAM OFDM Systems with Imperfect Channel Estimation and I/Q Imbalance,
EURASIP J. Wireless Communications and Networking, Sept. 2012.
- N. Ermolova and O. Tirkkonen, Distribution of Diagonal Elements of a General Central Complex Wishart Matrix, IEEE Communications Letters, vol. 16, no. 9, pp. 1373-1376, Sept. 2012.
- L. Wei and O. Tirkkonen, Spectrum Sensing in the Presence of Multiple Primary Users, IEEE Transactions on Communications, vol. 60, no. 5, pp. 1268-1277, May 2012.
- N. Ermolova and O. Tirkkonen, Multivariate eta-mu Distribution with Constant Correlation Model, IEEE Communications Letters, vol. 16, no. 4, pp. 454-457, April 2012.
-
J.-M. Koljonen, M. Peltomaki, O. Tirkkonen, and M. Alava,
Algorithms
for Self-Organizing Resource Allocation in Wireless
Networks,
IEEE Transactions on Vehicular Technology, vol. 61, no. 1, pp. 346-359, Jan 2012.
-
R.-A. Pitaval, H.-L. Maattanen, K. Schober, O. Tirkkonen and R. Wichman,
Beamforming Codebooks for Two Transmit Antenna Systems based on Optimum Grassmannian Packings,
IEEE Transactions on Information Theory, vol. 57, no. 10, pp. 6591 -6602, Oct 2011.
Some recent conference papers (note that this is a permanent
repository of some publicly funded research, which may explain
why this looks like a pseudo-random selection of papers):
- B. Shaikh, P. Garau Burguera, H. Al-Tous, M. Juntti, B. M. Khan and O. Tirkkonen,
Channel Charting Based Pilot Allocation in MIMO Systems,
IEEE PIMRC, Sept. 2024.
- X. Li, H. Al-Tous, S. E. Hajri and O. Tirkkonen,
Enhanced Weighted K-nearest Neighbour Positioning,
IEEE VTC-Spring, June 2024.
- J. Liao and Olav Tirkkonen,
Coded Caching in Presence of User Inactivity,
IEEE WCNC, 6 pp., April 2022.
- R. Vehkalahti, T. Pllaha and O. Tirkkonen,
Signature Code Design for Fast Fading Channels,
IEEE ISIT, 5 pp., July 2021.
- M. Amidzadeh, H. Al-Tous, O. Tirkkonen and J. Zhang,
Joint Cache Placement and Delivery Design using Reinforcement
Learning for Cellular Networks, IEEE VTC-Spring,
6 pp., Apr 2021.
- R. Vehkalahti, J. Liao, T. Pllaha, W. Han and O. Tirkkonen,
CSI Quantization for FDD Massive MIMO Communication, IEEE VTC-Spring, 5 pp., Apr 2021.
- R. Vehkalahti, T. Pllaha and O. Tirkkonen,
Towards Ultra-Reliable Signature Coding With Multiple Transmit Antennas, IEEE VTC-Spring,
5 pp., Apr 2021.
- G. Yang, Y. Liao, Y.-C. Liang, O. Tirkkonen,
Reconfigurable Intelligent Surface Empowered Device-to-Device Communication Underlaying Cellular Networks, IEEE WCNC,
6 pp., Apr 2021.
- M. Amidzadeh, H. Al-Tous, O. Tirkkonen and G. Caire,
Cellular Network Caching Based on Multipoint Multicast Transmissions, IEEE GLOBECOM, 6 pp., Nov 2020.
- T. Pllaha, O. Tirkkonen, R. Calderbank,
Reconstruction of Multi-user Binary Subspace Chirps, IEEE ISIT , 6 pp, June 2020.
- O. Tirkkonen and R. Calderbank,
Codebooks of Complex Grassmannian Lines Based on Binary Subspace Chirps , IEEE Information Theory Workshop, 5 pp., Aug 2019.
- C. Boyd, R. Vehkalahti, O. Tirkkonen and A. Laaksonen,
Code Design Principles for Ultra-Reliable Random Access with Preassigned Patterns , IEEE ISIT, 5 pp., July 2019.
- J. Deng, S. Medjkouh, N. Malm, O. Tirkkonen and C. Studer,
Multipoint Channel Charting for Wireless Networks ,
Asilomar Conf. on Signals, Systems and Computers, 5 pp., Nov. 2018.
- C. Boyd, R. Vehkalahti and O. Tirkkonen,
Combinatorial Code Designs for Ultra-Reliable IoT Random Access , IEEE PIMRC-Workshops, 5 pp., Oct 2017.
- L. Zhou, O. Tirkkonen and R. Berry
``Two-Player D2D Interference Canceling Games, IEEE PIMRC , 7 pp., Oct 2017.
- O. Tirkkonen, C. Boyd and R. Vehkalahti,
Grassmannian Codes from Multiple Families of Mutually Unbiased
Bases, IEEE Internat. Conf. on Information Theory (ISIT),
5 pp., June 2017.
- J. Liu, G. Wu, S. Li and O. Tirkkonen,
Blind detection of uplink grant-free SCMA with
unknown user sparsity, IEEE ICC, 6 pp., May 2017.
- O. Tirkkonen and C. Studer,
Subset-codebook precoding for 1-bit massive multiuser MIMO,
Conference on Information Sciences and Systems (CISS),
5 pp., March 2017.
- J. Deng, A. Dowhuszko, R. Freij and O. Tirkkonen, Relay
Selection and Resource Allocation for D2D-Relaying under Uplink
Cellular Power Control, IEEE Globecom, Workshop on Emerging
Technologies for 5G Wireless Cellular Networks, 6 pp., Nov 2015.
- A. Barreal, J. Paakkonen, D. Karpuk, C. Hollanti and O.
Tirkkonen, A Low-Complexity Message Recovery Method for
Compute-and-Forward Relaying, IEEE Information Theory Workshop, 5 pp., Oct 2015.
- R.-A. Pitaval, L. Wei, O. Tirkkonen and J. Corander, On the
exact volume of metric balls in complex Grassmann manifolds, IEEE
Information Theory Workshop, 5 pp., Oct 2015.
- B. Singh, K. Koufos, O. Tirkkonen and R. Jantti,
Repeated
spectrum sharing games in multi-operator heterogeneous networks,
IEEE DySPAN, 8 pp., Oct 2015.
- L. Zhou, J. Kerttula, N. Malm, Y. Beyene, K. Ruttik, O.
Tirkkonen and R. Jantti, Creating Secondary Spectrum Usage
Opportunity for D2D Communication with Interference Cancellation,
IEEE DySPAN, Demonstration track, 2 pp., Oct 2015.
- Y. Beyene, N. Malm, J. Kerttula, L. Zhou, K. Ruttik, R. Jantti,
O. Tirkkonen and C. Bockelmann, Spectrum Sharing for MTC Devices
in LTE, IEEE DySPAN, Demonstration track, 2 pp., Oct 2015.
- J. Kerttula, Y. Beyene, N. Malm, L. Zhou, K. Ruttik, O.
Tirkkonen and R. Jantti, Spectrum Sharing in D2D Enabled HetNet,
IEEE DySPAN, Demonstration track, 2 pp., Oct 2015.
- J. Paakkonen, C. Hollanti and O. Tirkkonen, Device-to-device
data storage with regenerating codes, Internat. Workshop on
Multiple Access Communications, pp. 57-69, Sept 2015.
- Y. Beyene, C. Boyd, K. Ruttik, C. Bockelmann, O. Tirkkonen and
R. Jantti, Compressive Sensing for MTC in New LTE Uplink
Multi-User Random Access Channel, IEEE Africon, 5 pp. Sept 2015.
- C. Boyd, R.-A. Pitaval, O. Tirkkonen and R. Wichman,
On the
Time-Frequency Localisation of 5G Candidate Waveforms, Signal
Processing Advances for Wireless Communications (SPAWC), 5 pp., June
2015.
- L. Wei, R.-A. Pitaval, J. Corander and O. Tirkkonen, On the
Volume of a Metric Ball in Unitary Group, IEEE ISIT, 7 pp., June 2015.
- S. Lembo, A. Dowhuszko and O. Tirkkonen,
Joint Resource Allocation in Mobile Networks with Macro Cellular and Device-to-Device Communication,
IEEE ICC, Workshop on Device-to-Device Communication for Cellular and Wireless Networks,
6 pp., June 2015.
- B. Singh, K. Koufos, O. Tirkkonen and R. Berry, Co-primary
inter-operator spectrum sharing over a limited spectrum pool using
repeated games, IEEE ICC, 6 pp., June 2015.
- C. Boyd, R.-A. Pitaval, U. Parts and O. Tirkkonen,
Non-binary Classical Error-correcting Codes for Quantum
Communication, IEEE ICC, 6 pp., June 2015.
- F. Ahmed and O. Tirkkonen, Self-Organized Physical Cell ID
Assignment in Multi-operator Heterogeneous Networks,
IEEE VTC-Spring, 5 pp., May 2015.
- L. Zhou, K. Ruttik, O. Tirkkonen, Interference Canceling Power
Optimization for Device-to-Device Communication,
IEEE VTC-Spring, 5 pp., May 2015.
- U. Oruthota and O. Tirkkonen, I/Q Interference in
Device-to-Device Underlay Communication with Uplink Power Control,
IEEE VTC-Spring, 5 pp., May 2015.
- L. F. Del Carpio, A. Dowhuszko, O. Tirkkonen and G. Wu,
Cooperative Device-to-Device Communication, IEEE VTC-Spring, 6
pp., May 2015.
- S. Hailu, P. Lunden, E. Virtej, N. Kolehmainen, O. Tirkkonen and
C. Wijting, DRX-Aware Power and Delay Optimized Scheduler
for Bursty Traffic Transmission, IEEE VTC-Spring, 5 pp., May 2015.
- J. Vihriala, E. Lahetkangas, K. Pajukoski, N. Ermolova and O.
Tirkkonen, On the Waveforms for 5G Mobile Broadband
Communications, IEEE VTC-Spring, 5 pp., May 2015.
- L. Zhou, K. Ruttik, O. Tirkkonen, R. Berry,
Cell-edge Inversion by Interference Cancellation for Downlink Cellular Systems, IEEE Internat. Conf. on Communication Systems, 5 pp., Nov. 2014.
- S. Hailu, A. Dowhuszko, O. Tirkkonen and L. Wei, One-Shot Games for Spectrum Sharing among Co-Located Radio Access Networks, IEEE Internat. Conf. on Communication Systems, 6 pp., Nov. 2014.
- B. Singh, K. Koufos and O. Tirkkonen, Co-primary inter-operator spectrum sharing using repeated games, IEEE Internat. Conf. on Communication Systems, 5 pp., Nov. 2014.
- F. Ahmed and O. Tirkkonen, Topological Aspects of Greedy Self-Organization, IEEE Internat. Conf. on Self-Adaptive and Self-Organizing Systems, pp. 31--39, Sept 2014.
- J. Kerttula, N. Malm, K. Ruttik, R. Jantti and O. Tirkkonen, Implementing TD-LTE as software defined radio in general purpose processor ACM SIGCOMM, workshop of Software Radio Implementation Forum, 7 pp., August 2014.
- B. Singh, K. Koufos and O. Tirkkonen, Coordination protocol for inter-operator spectrum sharing based on spectrum usage favors, European Conf. on Networks and Communications (EuCNC), 2 pp., June 2014.
- F. Ahmed, O. Tirkkonen, A. Dowhuszko and M. Juntti, Distributed Power Allocation in Cognitive Radio Networks under Network Power Constraint, Internat. Conf. on Cognitive Radio Oriented Wireless Networks (CrownCom), 6 pp., June 2014.
- S. Hailu, A. Dowhuszko and O. Tirkkonen, Adaptive Co-primary Shared Access Between Co-located Radio Access Networks, Internat. Conf. on Cognitive Radio Oriented Wireless Networks (CrownCom), 5 pp., June 2014.
- G. Berardinelli, F. Tavares, T. Sørensen, P. Mogensen, O. Tirkkonen and P. Amin, Distributed Initial Synchronization for 5G small cells, IEEE VTC-Spring, 6 pp., 2014.
- G. Berardinelli, K. Pajukoski, E. Lahetkangas, R. Wichman, O. Tirkkonen, P. Mogensen, On the potential of OFDM enhancements as 5G waveforms, IEEE VTC-Spring, 6 pp., 2014.
- J. Paakkonen, C. Hollanti and O. Tirkkonen, Device-to-Device Data Storage for Mobile Cellular Systems, IEEE GLOBECOM, 6 pp., Dec 2013.
- L.F. Del Carpio, M. Lampinen, M. Enescu, T. Koivisto, O. Tirkkonen, Network-assisted widely linear receivers for LTE, IEEE VTC-Fall, 5 pp., 2013.
- R.-A. Pitaval and O. Tirkkonen, Flag Orbit Codes and Their Expansion to Stiefel Codes, IEEE Information Theory Workshop, 5 pp, Sept. 2013.
- I. Harjula, R. Wichman, K. Pajukoski, E. Lahetkangas, E. Tiirola and O. Tirkkonen, Full Duplex Relaying for Local Area, IEEE PIMRC, pp. 2684--2688, Sept 2013.
- A. Prasad, P. Lunden, O. Tirkkonen and C. Wijting, Mobility State Based Flexible Inter-Frequency Small Cell Discovery for Heterogeneous Networks, IEEE PIMRC, pp. 2057--2061, Sept 2013.
- A. Prasad, P. Lunden and O. Tirkkonen, Enhanced Small Cell Discovery in Heterogeneous Networks Using Optimized RF Fingerprints, IEEE PIMRC, pp. 2973--2977, Sept 2013.
- A. Dowhuszko, O. Tirkkonen, J. Karjalainen, T. Henttonen and J. Pirskanen, A Decentralized Cooperative Uplink/Downlink Adaptation Scheme for TDD Small Cell Networks, IEEE PIMRC, pp. 1682--1687, Sept 2013.
- F. Ahmed, A. Dowhuszko, O. Tirkkonen and R. Berry, A Distributed Algorithm for Network Power Minimization in Multicarrier Systems, IEEE PIMRC, pp. 1914--1918, Sept 2013.
- L. Wei and O. Tirkkonen, Multiple Primary User Spectrum Sensing for Unknown Noise Statistics, IEEE PIMRC, pp. 871--875, Sept 2013.
- A. Dowhuszko, F. Ahmed and O. Tirkkonen, Decentralized Transmit Beamforming Scheme for Interference Coordination in Small Cell Networks, IEEE BlackSeaCom, pp. 121--126, July 2013.
- L. Zhou, K. Ruttik, O. Tirkkonen and R. Berry, Interference canceling power control games in Gaussian interference channels, IEEE ISIT, pp. 1112--1116, July 2013.
- Sergio Lembo, Petteri Lunden, Olav Tirkkonen and Kimmo Valkealahti, Optimal muting ratio for Enhanced Inter-Cell Interference Coordination (eICIC) in HetNets, IEEE ICC, Workshop on small cell networks, pp. 1145--1149, June 2013.
- M. Ding, O. Tirkkonen, R. A. Berry and S. Ulukus, Distributed Precoding for MISO Interference Channels with Channel Mean Feedback: Algorithms and Analysis, IEEE ICC, pp. 5640-5645, June 2013.
- O. Tirkkonen, E. Lahetkangas, K. Pajukoski, E. Tiirola, I. Harjula, Multihop Relaying for Local Area Access, IEEE VTC--Spring Workshops, 5 pp., June 2013.
- P. Amin, O. Tirkkonen, T. Henttonen and E. Pernila, Dynamic Frequency Selection based on Carrier Pricing between cells, IEEE VTC--Spring, 5 pp., June 2013.
- N. Ermolova and O. Tirkkonen, Performance analysis of communication systems over generalized alpha-lambda-eta-mu fading radio channels, IEEE VTC--Spring, 5 pp., June 2013.
- U. Oruthota, O. Tirkkonen and P. Dharmawansa, Analysis of Uplink Power Control in Cellular Mobile Systems, IEEE VTC--Spring, 5 pp., June 2013.
- A. Prasad, P. Lunden, O. Tirkkonen and C. Wijting, Energy Efficient Small-Cell Discovery Using Received Signal Strength Based Radio Maps, IEEE VTC--Spring, 5 pp., June 2013.
- A. Prasad, P. Lunden, O. Tirkkonen and C. Wijting, Energy-Efficient Flexible Inter-Frequency Scanning Mechanism for Enhanced Small Cell Discovery, IEEE VTC--Spring, 5 pp., June 2013.
- R.-A. Pitaval, A. Srinivasan and O. Tirkkonen, Codebooks in Flag Manifolds for Limited Feedback MIMO Precoding, ITG Conference on Systems, Communications and Coding (SCC), 5 pp., Jan. 2013.
- C.H. Yu, B. Mumey and O. Tirkkonen, Distributed Multiple Relay Selection by an Auction Mechanism, IEEE GLOBECOM, pp. 4392--4397, Dec. 2012.
- R.-A. Pitaval and O. Tirkkonen, Volume of Ball and Hamming-type Bounds for Stiefel Manifold with Euclidean Distance, Asilomar Conf. on Signals, Systems and Computers, pp. 483-487, Nov. 2012.
- R.-A. Pitaval and O. Tirkkonen, Grassmannian Packings from Orbits of Projective Group Representations, Asilomar Conf. on Signals, Systems and Computers, pp. 478--482, Nov. 2012.
- O. Tirkkonen and R. Jantti, On alpha-Proportional Fair Packet Scheduling in OFDMA downlink, Allerton Conference on Communication, Control, and Computing, pp. 241--245, Oct. 2012.
- Joonas Paakkonen, Prathapasinghe Dharmawansa, Camilla Hollanti, Olav Tirkkonen, Distributed Storage for Proximity Based Services, Swedish Communications Technologies Workshop, pp. 30--35, Oct 2013.
- P. Amin, V. P. K. Ganesan, O. Tirkkonen, Bridging Interference Barriers in Self-organized Synchronization, IEEE Internat. Conf. on Self-Adaptive and Self-Organizing Systems, pp. 109--118, Sept 2012.
- U. Oruthota and O. Tirkkonen, I/Q Imbalance Compensation in Precoded MIMO-OFDMA Systems, 15th Internat. Symp. Wireless Personal Multimedia Commun. (WPMC), pp. 291--295., Sept. 2012.
- H.-L. Maattanen and O. Tirkkonen, Simple Zero Interference Transmissions to Users with Rank Deficient Channels, 15th Internat. Symp. Wireless Personal Multimedia Commun. (WPMC), pp. 281--285, Sept. 2012.
- L. Wei, P. Dharmawansa and O. Tirkkonen, Locally Best Invariant Test for Multiple Primary User Spectrum Sensing, Internat. Conf. on Cognitive Radio Oriented Wireless Networks (CrownCom), pp. 367--372, June 2012.
- F. Ahmed, A. Dowhuszko, and O. Tirkkonen, Distributed Algorithm for Downlink Resource Allocation in Multicarrier Small Cell Networks, IEEE ICC, Workshop on small cell networks, pp. 6802-6808, June 2012.
- L. Wei, O. Tirkkonen, P. Dharmawansa and M. McKay, On the Exact Distribution of the Scaled Largest Eigenvalue, IEEE ICC, pp. 2422--2426, June 2012.
- R.-A. Pitaval and O. Tirkkonen,
Incorporating Stiefel Geometry in Codebook Design and Selection for Improved Base Station Cooperation, IEEE VTC--Spring, 5 pp., May 2012.
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H.-L. Maattanen and O. Tirkkonen,
Sum Rate Maximizing Zero Interference Linear Multiuser MIMO Transmission, IEEE VTC--Spring, 5 pp., May 2012.