Kenta Umebayashi
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On the selection of the best detection performance sensors for cognitive radio networks
Z Khan, J Lehtomaki, K Umebayashi, J Vartiainen
IEEE Signal Processing Letters 17 (4), 359-362, 2010
Frequency and time domain channel models for nanonetworks in terahertz band
J Kokkoniemi, J Lehtomäki, K Umebayashi, M Juntti
IEEE Transactions on Antennas and Propagation 63 (2), 678-691, 2014
On the measurement of duty cycle and channel occupancy rate
JJ Lehtomaki, R Vuohtoniemi, K Umebayashi
IEEE Journal on Selected Areas in Communications 31 (11), 2555-2565, 2013
Efficient decision fusion for cooperative spectrum sensing based on OR-rule
K Umebayashi, JJ Lehtomaki, T Yazawa, Y Suzuki
IEEE transactions on wireless communications 11 (7), 2585-2595, 2012
Study on soft decision based cooperative sensing for cognitive radio networks
H Uchiyama, K Umebayashi, T Fujii, F Ono, K Sakaguchi, Y Kamiya, ...
IEICE transactions on communications 91 (1), 95-101, 2008
Estimation of primary channel activity statistics in cognitive radio based on imperfect spectrum sensing
OH Toma, M Lopez-Benitez, DK Patel, K Umebayashi
IEEE Transactions on Communications 68 (4), 2016-2031, 2020
Energy detection based estimation of channel occupancy rate with adaptive noise estimation
JJ Lehtomaki, R Vuohtoniemi, K Umebayashi, JP Makela
IEICE transactions on communications 95 (4), 1076-1084, 2012
A causal channel model for the terahertz band
K Tsujimura, K Umebayashi, J Kokkoniemi, J Lehtomäki, Y Suzuki
IEEE Transactions on Terahertz Science and Technology 8 (1), 52-62, 2017
Improved channel occupancy rate estimation
JJ Lehtomäki, M López-Benítez, K Umebayashi, M Juntti
IEEE Transactions on Communications 63 (3), 643-654, 2015
Study on cooperative sensing in cognitive radio based ad-hoc network
H Uchiyama, K Umebayashi, Y Kamiya, Y Suzuki, T Fujii, F Ono, ...
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio …, 2007
Threshold-setting for spectrum sensing based on statistical information
K Umebayashi, K Hayashi, JJ Lehtomäki
IEEE Communications Letters 21 (7), 1585-1588, 2017
Analysis of cognitive radio networks with imperfect sensing
I Suliman, J Lehtomäki, T Bräysy, K Umebayashi
2009 IEEE 20th international symposium on personal, indoor and mobile radio …, 2009
Estimation of primary channel activity statistics in cognitive radio based on periodic spectrum sensing observations
M Lopez-Benitez, A Al-Tahmeesschi, DK Patel, J Lehtomäki, ...
IEEE Transactions on Wireless Communications 18 (2), 983-996, 2018
Smart spectrum for future wireless world
T Fujii, K Umebayashi
IEICE Transactions on Communications 100 (9), 1661-1673, 2017
Simple primary user signal area estimation for spectrum measurement
K Umebayashi, K Moriwaki, R Mizuchi, H Iwata, S Tiiro, JJ Lehtomäki, ...
IEICE Transactions on Communications 99 (2), 523-532, 2016
Energy constrained optimization for spreading factor allocation in lorawan
S Narieda, T Fujii, K Umebayashi
Sensors 20 (16), 4417, 2020
Efficient time domain deterministic-stochastic model of spectrum usage
K Umebayashi, M Kobayashi, M Lopez-Benitez
IEEE Transactions on Wireless Communications 17 (3), 1518-1527, 2017
Direct communication between terminals in infrastructure based networks
J Lehtomäki, I Suliman, J Vartiainen, M Bennis, A Taparugssanagorn, ...
Proc. ICT Mobile Wireless Commun. Summit, 1-8, 2008
Blind adaptive estimation of modulation scheme for software defined radio
K Umebayashi, S Ishii, R Kohno
11th IEEE International Symposium on Personal Indoor and Mobile Radio …, 2000
Development of a measurement system for spectrum awareness
K Umebayashi, S Tiiro, JJ Lehtomäki
1st International Conference on 5G for Ubiquitous Connectivity, 234-239, 2014
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