論文誌 Journal

■H. Sano, K. Umebayashi, S. Suzuki, H. Sasaki, Y. Kaneda  "Accurate Noise Source Separation in Pulse-Frequency Modulation-Controlled Power Converters Using Asynchronous Near-Field and Far-Field Measurement Analysis" in IEEE Access Print, ISSN: 2169-3536, Online ISSN: 2169-3536, Digital Object Identifier: 10.1109/ACCESS.2025.3610518

国際会議 Publications in International Conference

論文誌 Journal

■S. P. Sone, J. Lehtomäki, Z. Khan, K. Umebayashi and K. S. Kim, "Robust EV Scheduling in Charging Stations Under Uncertain Demands and Deadlines" in IEEE Transactions on Intelligent Transportation Systems ( Volume: 25, Issue: 12, December 2024)

■Z. Wu, K. Umebayashi, J. Lehtomäki, and N. Zorba, “Experimental Delay Tests in Causal THz Channel Model.” J Infrared Milli Terahz Waves, Apr. 2024. 

■S. P. Sone, K. Umebayashi, J. Lehtomäki, K. S. Kim and Z. Khan, “Robust EV Scheduling in Charging Stations Under Uncertain Demands and Deadlines” in IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, VOL. 25, NO. 12, DECEMBER 2024 , Apr. 2024. 

国際会議 Publications in International Conference

■K. Umebayashi, "Digital signal processing for THz wireless communications -Antenna Spacing based beamforming-," 2024 International workshop on Wireless Communications in Terahertz at IEEE EuCNC & 6G summit, Antwerp, Belguim, 2024

論文誌 Journal

■Mohammed M. Alammar, Miguel Lopez-Benitez, Janne Lehtomäki, and Kenta Umebayashi, "Enhanced Signal Area Estimation in Radio-Communication Spectrograms based on Morphological Image Processing. " Wireless Communications and Mobile Computing., 2023.

国際会議 Publications in International Conference

■K. Umebayashi, "Digital signal processing for THz wireless communications," 2023 International workshop on Wireless Communications in Terahertz at IEEE EuCNC & 6G summit, Gothenburg, Sweden, 2023

■K. Umebayashi, Y. Kasahara, H. Iwata, A. Al-Tahmeesschi and J. Vartiainen, "Spectrum Occupancy Prediction based on adaptive Recurrent Neural Networks," 2023 IEEE Wireless Communications and Networking Conference (WCNC), Glasgow, United Kingdom, 2023, pp. 1-6

論文誌 Journal

■D. Abdelhameed, K. Umebayashi, I. Atzeni and A. Tölli, "Enhanced Signal Detection and Constellation Design for Massive SIMO Communications With 1-Bit ADCs," in IEEE Access, vol. 11, pp. 11749-11765, 2023.

■S. Ishihara, K. Umebayashi and J. J. Lehtomäki, "Energy Detection for M-QAM Signals," in IEEE Access, vol. 11, pp. 6305-6319, 2023.

■Z. Wu, K. Umebayashi, J. Lehtomäki and N. Zorba, "Device-to-device Communications at the Terahertz Band: Open Challenges for Realistic Implementation," in IEEE Communications Standards Magazine, vol. 7, no. 1, pp. 82-87, March 2023.

■S. P. Sone, J. Lehtomäki, Z. Khan, K. Umebayashi and Z. Javed, "Proactive Radar Protection System in Shared Spectrum via Forecasting Secondary User Power Levels," in IEEE Access, vol. 10, pp. 40367-40380, Apr. 2022.

国際会議 Publications in International Conference

■K. Umebayashi, Y. Kasahara, H. Iwata, A. Al-Tahmeesschi and J. Vartiainen, "Spectrum Occupancy Prediction based on adaptive Recurrent Neural Networks," 2023 IEEE Wireless Communications and Networking Conference (WCNC), Glasgow, United Kingdom, 2023, pp. 1-6.

■J. Lehtomäki, K. Umebayashi, A. Al-Tahmeesschi and M. Juntti, "Distance Estimation Based on Molecular Absorption at THz Frequencies," 2022 IEEE Globecom Workshops (GC Wkshps), Rio de Janeiro, Brazil, 2022, pp. 1598-1603

■S. P. Sone, J. Lehtomäki, Z. Khan, K. Umebayashi and Z. Javed, "Utilizing Uncertainty of Time Series Prediction in Spectrum Sharing with Radar Systems," 2022 30th Telecommunications Forum (TELFOR), Belgrade, Serbia, 2022, pp. 1-4.

論文誌 Journal

■ Al-Tahmeesschi, Ahmed, et al. "Feature-based deep neural networks for short-term prediction of WiFi channel occupancy rate." IEEE Access (2021).

■ Alzard, M., Althunibat, S., Umebayashi, K., & Zorba, N. (2021). Performance Analysis of Resource Allocation in THz-Based Subcarrier Index Modulation Systems for Mobile Users. IEEE Access, 9, 129771-129781.

■Kazuhiro Tsujimura, Kenta Umebayashi, Nizar Zorba, Adaptive threshold setting for OOK modulation with a prefix code in THz band, IEICE Communications Express, Mar, 2022.

国際会議 Publications in International Conference

■ Wu, Z., Ebisawa, H., Umebayashi, K., Lehtomäki, J., & Zorba, N. (2021, June). Time domain propagation characteristics with causal channel model for terahertz band. In 2021 IEEE International Conference on Communications Workshops (ICC Workshops) (pp. 1-6). IEEE.

■ Sone, S. P., Lehtomäki, J., Khan, Z., & Umebayashi, K. (2021, June). Forecasting Wireless Network Traffic and Channel Utilization Using Real Network/Physical layer Data. In 2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit) (pp. 31-36). IEEE.

■ Ishihara, S., Umebayashi, K., & Lehtomäki, J. (2021, April). Energy Detection for M-QAM Signals. In 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) (pp. 1-5). IEEE.

■ Kim, H., Fujii, T., & Umebayashi, K. (2021, April). Relay Nodes Selection Using Reinforcement Learning. In 2021 International Conference on Artificial Intelligence in Information and Communication (ICAIIC) (pp. 329-334). IEEE.

■M. Alzard, S. Althunibat, K. Umebayashi and N. Zorba, "Resource Allocation in THz-based Subcarrier Index Modulation Systems for Mobile Users," 2021 IEEE Global Communications Conference (GLOBECOM), Madrid, Spain, 2021, pp. 01-06.

■D. Abdelhameed, K. Umebayashi, A. Al-Tahmeesschi, I. Atzeni and A. Tölli, "Enhanced Signal Detection for Massive SIMO Communications with 1-Bit ADCs," 2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Lucca, Italy, 2021, pp. 66-70.

論文誌 Journal

■ S. Narieda, T. Fujii, K. Umebayashi, "Energy Constrained Optimization for Spreading Factor Allocation in LoRaWAN, " Sensors 20, no. 16: 4417, Aug. 2020.

■ S. Narieda, D. Cho, H. Ogasawara, K. Umebayashi, T. Fujii, H. Naruse, “Theoretical Analyses of Maximum Cyclic Autocorrelation Selection Based Spectrum Sensing, ” in IEICE Transactions on Communications (accepted).

■ O. H. Toma, M. López-Benítez, D. K. Patel and K. Umebayashi, "Estimation of Primary Channel Activity Statistics in Cognitive Radio Based on Imperfect Spectrum Sensing," in IEEE Transactions on Communications, vol. 68, no. 4, pp. 2016-2031, April 2020.

国際会議  Publications in International Conference

■ Umebayashi, Kenta, Yoshimasa Kimoto, and Antti Tölli. "Adaptive Antenna Array with weight and antenna space control." 2020 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2020.

■ Al-Tahmeesschi, Ahmed, et al. "Applying Deep Neural Networks for Duty Cycle Estimation." 2020 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2020.

■ Iwata, Hiroki, et al. "A Study on High-Efficiency Energy Detection-Based Spectrum Measurements." 2020 IEEE Wireless Communications and Networking Conference Workshops (WCNCW). IEEE, 2020.

■A. Kaichi, S. Narieda, T. Fujii, K. Umebayashi and H. Naruse, "On Placement of End Devices in LPWAN Based WSN for Environmental Monitoring Applications," 2020 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), Auckland, New Zealand, 2020, pp. 1519-1522.

論文誌 Journal 

■ K. Umebayashi, Y. Tamaki, M. López-Benítez and J. J. Lehtomäki, "Design of Spectrum Usage Detection in Wideband Spectrum Measurements," in IEEE Access, vol. 7, pp. 133725-133737, 2019.

■ M. López-Benítez, A. Al-Tahmeesschi, D. K. Patel, J. Lehtomäki and K. Umebayashi, "Estimation of Primary Channel Activity Statistics in Cognitive Radio Based on Periodic Spectrum Sensing Observations," in IEEE Transactions on Wireless Communications, vol. 18, no. 2, pp. 983-996, Feb. 2019.

■ A. Al-Tahmeesschi, M. López-Benítez, D. Patel, J. Lehtomäki and K. Umebayashi, "On the Sample Size for the Estimation of Primary Activity Statistics Based on Spectrum Sensing," in IEEE Transactions on Cognitive Communications and Networking, vol. 5, no. 1, pp. 59-72, March 2019.

■S. Narieda, D. Cho, K. Umebayashi, Hiroshi Naruse, “Weight Updating Technique in Spectrum Sensing Based on CAF Shared Diversity Combining,” IEICE Communications Express Oct. 2019.

国際会議 Publications in International Conference 

■ Hiroki Iwata, Kenta Umebayashi, Ahmed Al-Tahmeesschi, Miguel López-Benítez and Janne J. Lehtomäki,"Time and Frequency Varying Noise Floor Estimation for Spectrum Usage Measurement," IEEE Wireless Communications and Networking Conference Workshop (WCNCW) - International Workshop on Smart Spectrum (IWSS), Marrakech, Morocco, Apr. 2019

論文誌 Journal 

■ Daiki Cho, Shusuke Narieda and Kenta Umebayashi, "Low Computational Complexity Spectrum Sensing Based on Cyclostationarity for Multiple Receive Antennas," IEICE Commun. Express (accepted)

■ Kenta Umebayashi, Masanao Kobayashi, and Miguel López-Benítez, "Efficient time domain deterministic-stochastic model of spectrum usage" IEEE Transactions on Wireless Communications, (accepted)

■ Hiroki Iwata, Kenta Umebayashi, Janne Lehtomäki, and Shusuke Narieda, " Welch FFT Segment Size Selection Method for FFT Based Wide Band Spectrum Measurement," IEICE Transactions on Communications, Vol.E101-B,No.7,pp.TBD,Jul. 2018 (accepted).

■ Kazuhiro Tsujimura, Kenta Umebayashi, Joonas Kokkoniemi, Janne Lehtomäki, and Yasuo Suzuki, "A Causal Channel Model for THz band" IEEE Transaction on THz science and technology, vol. 8, no. 1, Jan. 2018.

国際会議 Publications in International Conference 

■ Hiroki Iwata, Kenta Umebayashi, Ahmed Al-Tahmeesschi and, Miguel Lopez-Benitez, "[Poster Presentation] Neural Network-based Channel Occupancy Rate Prediction," SmartCom 2018, vol. 118, no. 274, SR2018-88, pp. 75-82, Bangkok, Thailand, Oct. 2018.

■ Yoshimasa Kimoto, Kenta Umebayashi, Antti Tölli and, Jarkko Kaleva, "[Poster Presentation] Performance analysis of Two elements Adaptive Array Antenna based on Weights and Space Control," SmartCom 2018, vol. 118, no. 274, SR2018-81, pp. 51-56, Bangkok, Thailand, Oct. 2018.

■ Ryo Sato, Kenta Umebayashi and, K.B. Shashika Manosha, "[Poster Presentation] Efficient channel allocation for Citizens broadband radio service/spectrum access system," SmartCom 2018, vol. 118, no. 274, SR2018-89, pp. 83-84, Bangkok, Thailand, Oct. 2018.

■Kazuhiro Tsujimura, Kenta Umebayashi, Joonas Kokkoniemi and Janne Lehtomäki, " A study on impulse response model of reflected path for THz band," APSIPA ASC 2018, Hawaii, USA, Nov., 2018.

論文誌 Journal 

■ Takeo Fujii and Kenta Umebayashi, "Smart Spectrum for FutureWirelessWorld," IEICE Transactions on Communications, vol. E100-B, no. 9, pp.1661-1673, Sep. 2017.

■ Kenta Umebayashi, Kazuhiro Hayashi, and Janne Lehtomäki, "Threshold-setting for Spectrum Sensing based on Statistical Information," IEEE Communications Letters, vol. 21, no. 7, pp.1585-1588, Jul. 2017.

国際会議 Publications in International Conference 

■ Kenta Umebayashi, Yoshimasa Kimoto, and Antti Tölli, "[Poster Presentation] Antenna configuration for antenna spacing based adaptive array antenna," SmartCom 2017, vol. 117, no. 257, SR2017-76, pp. 31-32, Rome, Italy, Oct. 2017.

■ Kenta Umebayashi, Hiroki Iwata, Janne Lehtomäki, and Miguel López-Benítez, "Study on Simple Signal Area Estimation for Efficient Spectrum Measurements", 2017 European Conference on Networks and Communications (EuCNC2017), Oulu, Finland, June 2017.

■ Hiroki Iwata, Kenta Umebayashi, Janne Lehtomäki, Miguel López-Benítez and Shusuke Narieda, "Development of a Smart Spectrum Access Prototype", 2017 European Conference on Networks and Communications (EuCNC2017), Oulu, Finland, June 2017.

■ Miguel López-Benítez, Ahmed Al-Tahmeesschi, Kenta Umebayashi, Janne Lehtomäki, "PECAS: A Low-Cost Prototype for the Estimation of Channel Activity Statistics in Cognitive Radio," in Proc. Wireless Communications and Networking Conference (WCNC), IEEE, San Francisco, CA, USA, Mar. 2017.

■ Riki mizuchi, Kenta Umebayashi, Janne Lehtomäki, and Miguel López-Benítez , "A study on false alarm cancellation for spectrum usage measurements," in 2017 IEEE Wireless Communications and Networking Conference (WCNC) - International Workshop on Smart Spectrum, San Francisco, USA, Mar. 2017.

論文誌 Journal 

■ Kenta Umebayashi, Janne Lehtomäki, Isameldin M. Suliman, "Analysis of transmit power setting technique for cognitive radio networks," EURASIP Journal on Wireless Communications and Networking, Jun. 2016.

■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Janne J. Lehtomäki, Miguel López-Benítez, and Yasuo Suzuki, "Welch FFT segment size slection method for spectrum awareness system," IEICE Transactions on Communications, vol.E99-B, no. 8, pp. 1813-1823, Aug. 2016.

■ Kenta Umebayashi, Kazuki Moriwaki, Riki Mizuchi, Hiroki Iwata, Samuli Tiiro, Janne Lehtomäki, Miguel López-Benítez, and Yasuo Suzuki, "Simple Primary User Signal Area Estimation for Spectrum Measurement," IEICE Transactions on Communications, Vol.E99-B, No.2, pp.523-532, Feb. 2016.

国際会議 Publications in International Conference 

■ Kazuhiro Tsujimura, Kenta Umebayashi, Joonas Kokkoniemi, and Janne Lehtomäki, "A Study on Channel Model for THz Band," ISAP 2016, Okinawa, Japan, Oct. 2016.

■ Daiki Cho, Atsushi Kondo, Shusuke Narieda, and Kenta Umebayashi, "CAF Diversity Combining for Spectrum Sensing by Test Statistics Sharing with Time-Averaged Weights," IEEE 84th Vehicular Technology Conference (VTC2016-Fall), Montréal, Canada, Sep. 2016.

■ Kenta Umebayashi, Janne Lehtomäki, and Miguel López-Benítez, "[Requested Talk] Smart Spectrum Access based on spectrum usage measurements," IEICE Tech. Rep., vol. 116, no. 29, SR2016-11, pp. 37-37, May 2016.

■ Daiki Cho, Shusuke Narieda and Kenta Umebayashi, "Approximated Theoretical Analysis for Spectrum Sensing Based on Maximum Cyclic Autocorrelation Selection," IEICE Tech. Rep., vol. 116, no. 29, SR2016-10, pp. 35-36, May 2016.

■ Riki Mizuchi, Kenta Umebayashi, Janne Lehtomäki, and Miguel López-Benítez, "A study on FFT-ED based signal area estimation for spectrum awareness," IEICE Tech. Rep., vol. 116, no. 29, SR2016-9, pp. 27-34, May 2016.

■Youhei Takeuchi and Kenta Umebayashi "[A study on positioning of a legitimated transmitter for physical layer security," IEICE Tech. Rep., vol. 116, no. 29, SR2016-17, pp. 59-65, May 2016.

■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Janne Lehtomäki, and Yasuo Suzuki, "Welch FFT segment size selection method for spectrum awareness," in 2016 IEEE Wireless Communications and Networking Conference (WCNC) - International Workshop on Smart Spectrum, Doha, Qatar, Apr. 2016. (Best paper award)

論文誌 Journal 

■ Isameldin M. Suliman, Janne Lehtomäki, and Kenta Umebayashi, "On the Effect of False Alarm Rate on the Performance of Cognitive Radio Networks," EURASIP Journal on Wireless Communications and Networking, Nov. 2015

■ Joonas Kokkoniemi, Janne Lehtomäki, Kenta Umebayashi, Markku Juntti, "Frequency and Time Domain Channel Models for Nanonetworks in Terahertz Band," IEEE Transactions on Antennas and Propagation, Vol.63, No.2, Feb. 2015.

■ Janne Lehtomäki, Miguel López-Benítez, Kenta Umebayashi, and M. Juntti. "Improved Channel Occupancy Rate Estimation," IEEE Transactions on Communications, Jan. 2015.

国際会議 Publications in International Conference 

■ Kenta Umebayashi, Riki Mizuchi, Hiroki Iwata, Kazuhiro Hayashi, Masanao Kobayashi, Samuli Tiiro, Yoshitaka Tamaki, Tatsuya Maruyama, Janne Lehtomäki, Miguel López-Benítez, and Yasuo Suzuki "Spectrum awareness system prototype for smart spectrum access," Technology Exhibit at International Workshop SmartCom 2015, Tokyo, Japan, Oct. 2015.

■ Kenta Umebayashi, Miguel López-Benítez, Janne Lehtomäki, and Samuli Tiiro, "Spectrum Measurement and Modeling for Spectrum Awareness in Cognitive Wireless Systems," Tutorial at International Workshop SmartCom 2015, Tokyo, Japan, Oct. 2015.

■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Yasuo Suzuki, and Janne Lehtomäki, "Optimum welch FFT segment size for duty cycle estimation in spectrum awareness system," in 2015 IEEE Wireless Communications and Networking Conference (WCNC) - International Workshop on Smart Spectrum, New Orleans, USA, Mar. 2015.

論文誌 Journal 

■ Kenta Umebayashi, Genichiro Murata, Yasuo Suzuki, "Detection Method of Same Spreading Code Signals by Multimodulus Algorithm," IEICE Transactions on Communications, Vol. E97-B , No. 4, pp. 807-816, Apr. 2014.

■ Samuli Tiiro, Kenta Umebayashi, Janne J. Lehtomaki, Yasuo Suzuki, "Spectrum Sharing in MIMO Cognitive Radio Systems with Imperfect Channel State Information," IEICE Transactions on Communications, Vol. E97-B , No. 4, pp. 867-874, Apr. 2014.

■ Samuli Tiiro, Kenta Umebayashi, Janne J. Lehtomaki, Yasuo Suzuki, "Study on MIMO-based spectrum sharing with stream allocation error," IEICE Communications Express, Vol. 3 , No. 4, pp. 124-130, Apr. 2014.

国際会議 Publications in International Conference 

■Kenta Umebayashi, Samuli Tiiro, Janne Lehtomaki, "Development of a measurement system for spectrum awareness," 5G for Ubiquitous Connectivity (5GU), 2014 1st International Conference on, pp. 234-239,26-28 Oct. 2014.

■ Hiroki Iwata, Kenta Umebayashi, Riki Mizuchi, Tatsuya Maruyama, Kazuki Moriwaki, Samuli Tiiro, Janne Lehtomaki, and Yasuo Suzuki, "Development of a measurement system for spectrum awareness -- Duty estimation based on Welch-FFT --," IEICE Technical Report, vol. 114, no. 284, SR2014-89, pp. 71-76, International Workshop(SmartCom 2014) , I2R, Singapore, Oct. 2014.

論文誌 Journal 

■ Samuli Tiiro, Kenta Umebayashi, Janne J Lehtomaki, Yasuo Suzuki "Decision fusion for cooperative source number estimation in cognitive radio networks" IEICE Communications Express, vol. 2, no. 11, pp. 484-489, Nov. 2013.

■ Janne Lehtomaki, R Vuohtoniemi, Kenta Umebayashi "On the Measurement of Duty Cycle and Channel Occupancy Rate" IEEE Journal on Selected Areas in Communications, vol. 31, no. 11, pp. 2555-2565, Nov. 2013.

■ Masashi Tsuji, Kenta Umebayashi, Yasuo Suzuki "Detection of the Number of Signals with Fewer Sensors than Sources Volume and Number" IEICE Transactions on Communications, vol. E96-B, no. 09, pp. 2235-2243, Sep. 2013.

■ Isameldin Suliman, Janne J Lehtomaki, Kenta Umebayashi, Marcos Katz "Analysis of Cognitive Radio Networks with Imperfect Sensing" IEICE Transactions on Communications, Vol. E96-B, No. 6, pp. 1605-1615, Jun. 2013.

国際会議 Publications in International Conference 

■ Kenta Umebayashi, Janne J Lehtomaki, Yasuo Suzuki “Study on spectrum sharing method based on distance estimation for cognitive radio networks" Global Communications Conference(GLOBECOM), Atlanta, DA, Dec. 2013.

■ Takashi Miura, Kenta Umebayashi, Janne J. Lehtomaki, Yasuo Suzuki “Robust Multiple Hypothesis Testing Approach for Dynamic Spectrum Sharing" 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications(PIMRC) , London ,UK, Sep. 2013.

■ Tokihito Watanabe, Kenta Umebayashi, Yasuo Suzuki “Blind Channel Order and Delay Timing Estimation in Autonomous Decentralized Network Using Asynchronous DS-CDMA" 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications(PIMRC), London ,UK, Sep. 2013.

■ Samuli Karri Tiiro, Kenta Umebayashi, Yasuo Suzuki “Power Control Method for MIMO-Based Cognitive Radio With Imperfect Channel State Information" IEEE Wireless Communications And Networking Conference 2013 (WCNC2013), SHANGHAI, CHINA, Apr. 2013.

■ Satoru Shimosaka, Kenta Umebayashi, Yasuo Suzuki “A Study on Stream Assignment Method for Secure MIMO Communication” The International Conference on Information Networking 2013 (ICOIN2013), pp. 12-17, Bangkok, Thailand, Jan. 2013.

■ Genichiro Murata, Kenta Umebayashi, Yasuo Suzuki “A Study on Detection Method of Same Spreading Code Signals by Multimodulus Algorithm” The International Conference on Information Networking 2013 (ICOIN2013), pp.268-273, Bangkok, Thailand, Jan. 2013.

論文誌 Journal 

■ Janne J. Lehtomaki, Risto Vuohtoniemi Kenta Umebayashi, Juha-Pekka Makela, " Energy Detection Based Estimation of Channel Occupancy Rate With Adaptive Noise Estimation" IEICE Transactions on Communications, E95-B: 04, pp. 1076-1084, Apr. 2012.

■ Kenta Umebayashi, Janne J. Lehtomaki Takanao Yazawa, Yasuo Suzuki "Efficient Decision Fusion for Cooperative Spectrum Sensing Based on OR-rule" IEEE Transactions on Wireless Communications, vol.11, no.7, pp.2585-2595, Jul. 2012．

■ Kenta Umebayashi, Hironori Tsuchiya, Yasuo Suzuki "Analysis of Optimal Weighted Cooperative Spectrum Sensing with Multiple Antenna Elements" IEICE Transactions on Communications, vol. E95-B, no. 10, pp. 3261-3269, Oct. 2012．

国際会議 Publications in International Conference 

■ Kenta Umebayashi, Janne J. Lehtomaki, Yasuo Suzuki "Study on Efficient Decision Fusion in OR-rule based Cooperative Spectrum Sensing" Wireless Communications and Networking Conference(WCNC), Apr. 2012. (Best Paper Award - PHY and fundamentals at the IEEE Wireless Communications and Networking Conference in Paris)

■ Kenta Umebayashi, Yasuo Suzuki "Analysis of optimal weighted cooperative spectrum sensing based on estimation of primary user signal power" IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Jun. 2012.

■ Masashi Tsuji, Takashi Morimoto, Kenta Umebayashi, Yasuo Suzuki "Nested Array and its Applications" The proceeding of the 9th IEEE Vehicular Technology Society (VTS) Asia Pacific Wireless Communications Symposium (APWCS2012), Kyoto, Japan, Aug. 2012.

論文誌 Journal 

■ Sho Furuichi, Kenta Umebayashi, Yasuo Suzuki "Performance Evaluation of Limited Feedback Transmit Precoding via Phase Rotation in Correlated MIMO Channel" International Conference on Wireless Communications and Signal Processing (WCSP2011), pp.9-11, Nanjing, China, Nov. 2011.

論文誌 Journal 

■ 辻真志 財団法人電気通信普及財団, Mar. 2011. (テレコムシステム技術学生賞受賞)

■ Masashi Tsuji, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki "Accurate Estimation of the Number of Weak Coherent Signals" IEICE Transactions on Communications, vol.E93-B, no.10, pp.2715-2724, Oct. 2010.

国際会議 Publications in International Conference 

■ Hironori Tsuchiya, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki "Weighted cooperative sensing with plural antenna elements " Radio and Wireless Symposium 2010 (RWS2010), New Orleans, LA, USA, 10-14 Jan. 2010.

■ Kenta Yamada, Kenta Umebayashi, Yukihiro Kamiya and Yasuo Suzuki “A Study on Routing Protocol Suitable for Directional Links” Radio and Wireless Symposium （RWS 2010）, New Orleans, LA, USA, 9-14, Jan. 2010.

論文誌 Journal 

■ Janne Lehtomäki, Isameldin Suliman, Kenta Umebayashi, Yasuo Suzuki "Teletraffic analysis of direct communication with clustering" IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E92-A: 5. 1356-1362 May. 2009.

国際会議 Publications in International Conference 

■ Masashi Tsuji, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki "A Study on the Accurate Estimation of the Number of Weak Coherent Signals" in the proceeding of the 6th European Radar Conference (EuRAD 2009), pp.234-237, Rome, Italy, Sep. 30 - Oct. Feb. 2009.

■ Yuichiro Komiya, Kenta Umebayashi, Yukihiro Kamiya, Kazuhiro Hirasawa, and Yasuo Suzuki "Study on a matching condition considering the mutual coupling for the Multi-terminal Dipole Antenna" EUROPEAN MICROWAVE CONFERENCE 2009, Rome, Italy, Sep. 29- Oct. Jan. 2009.

論文誌 Journal 

■ 鷹野 智, 藤井 威生, 梅林 健太, 神谷 幸宏, 鈴木 康夫 “アダプティブアレーアンテナと MACプロトコルを連携させたアドホック無線ネットワーク” 電子情報通信学会論文誌 B, vol.J91-B, no.5, pp.550-557, 2008.

■ Keigo HASEGAWA, Takeo FUJII, Kenta UMEBAYASHI, Yukihiro KAMIYA, Yasuo SUZUKI “Dialogue-Based Broadcasting Protocol for Wireless Ad Hoc Networks” IEICE Transaction. Fundamantal, Vol.E91-A No.7 pp.1642-1651, July 2008.

国際会議 Publications in International Conference 

■ Yuki Hamana, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki “ Direction-of-Arrival Estimation of Coherent Signal Waves Using Interpolated ESPRIT in Thinning Array Antenna” 11th Wireless Personal Multimedia Communications(WPMC2008), Lapland, Finland, Sep. 2008.

■ Kumiko Takeda, Kenta Umebayashi, Janne Lehtomaki, Yukihiro Kamiya, Yasuo Suzuki “ Study on the Reduction of Diffusion Time for On Demand Content Distribution”

11th Wireless Personal Multimedia Communications(WPMC2008), Lapland, Finland, Sep. 2008.

■ Keigo Hasegawa, Takeo Fujii, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki “SDMA Relay Method for Wireless Multihop Networks” 11th Wireless Personal Multimedia Communications(WPMC2008), Lapland, Finland, Sep. 2008. (Student paper award 受賞)

■ Nguyen Tran Khoa, Takeo Fujii, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki “Frequency sharing hotspot communication under uplink multi-carrier CDMA cellular system”

International Symposium on Wireless Communication Systems 2006(ISWCS2006). Volume 8 Issue 5, Pages 563-573, Jun. 2008

論文誌 Journal 

■ Hiromasa Uchiyama, Kenta Umebayashi, Takeo Fujii, Fumie Ono, Kei Sakaguchi, Yukihiro Kamiya, Yasuo Suzuki, “Study on Soft decision based Cooperative Sensing for Cognitive Radio networks,” IEICE Trans. on Commun, vol.E91-B, no.1, pp.95-101. Sep. 2007.

国際会議 Publications in International Conference 

■ Keigo Hasegawa, Takeo Fujii, Kenta Umebayashi, Yukihiro Kamiya, Yasuo Suzuki, “A Dialogue-based MAC Protocol for Efficient Broadcasting in Ad Hoc Networks,” 16th IST mobile and wireless communications summit, Budapest, Hungary, Jun. 2007.

■ Hiromasa Uchiyama, Kenta Umebayashi, Takeo Fujii, Fumie Ono, Kei Sakaguchi, Yukihiro Kamiya, Yasuo Suzuki, “Study on Cooperative Sensing in Cognitive Radio based Ad-hoc Network,” The International Symposium on Personal, Indoor and Mobile Radio Communications 2007(PIMRC2007), Athens ,Greece, Sep. 2007.

■ Hirohisa Onuki, Kenta Umebayashi, Yukihiro Kamiya, Kazuhiro Hirasawa, and Yasuo Suzuki, “A Study on Received and Re-radiated Power of a Receiving Antenna,” European Conference on Antennas and Propagation 2007(EuCAP 2007), Edinburgh, UK, Nov. 2007.