• 527 Citations
  • 12 h-Index
1988 …2019
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Research Output 1988 2019

2019

Optical radio channel propagation in wireless communication systems with LEDs

Denno, S., Fujitaka, S., Hou, Y., Tomisato, S. & Uehara, K., May 1 2019, GSMM 2019 - 12th Global Symposium on Millimeter Waves, Proceeding. Institute of Electrical and Electronics Engineers Inc., p. 50-52 3 p. 8797650. (GSMM 2019 - 12th Global Symposium on Millimeter Waves, Proceeding).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

wireless communication
Light emitting diodes
telecommunication
Communication systems
light emitting diodes
2018

Foreword

Uehara, K., Oct 2018, In : IEICE Transactions on Communications. E101B, 10, 1 p.

Research output: Contribution to journalEditorial

Transmission quality improvement by LED back-off optimization for visible light wireless communications

Chikamori, T., Tomisato, S., Denno, S. & Uehara, K., Feb 22 2018, Proceedings - 20th International Symposium on Wireless Personal Multimedia Communications, WPMC 2017. IEEE Computer Society, Vol. 2017-December. p. 229-233 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Light emitting diodes
Linearization
Communication
Orthogonal frequency division multiplexing
Computer simulation
2016
3 Citations (Scopus)

High-capacity wireless access networks using 920MHz band for wide-area IoT/M2M services

Akabane, K., Mochizuki, N., Teruhi, S., Kobayashi, M., Yoshino, S., Shimizu, M. & Uehara, K., Sep 1 2016, In : IEICE Transactions on Communications. E99B, 9, p. 1920-1929 10 p.

Research output: Contribution to journalArticle

Sensors
Pallets
Radio links
Gas meters
Wireless networks
5 Citations (Scopus)

Interference alignment and power allocation for multi-user MIMO interference channels

Panahi, F. H., Ohtsuki, T., Jiang, W., Takatori, Y. & Uehara, K., Jul 12 2016, 2016 IEEE International Conference on Communications, ICC 2016. Institute of Electrical and Electronics Engineers Inc., 7510851

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Base stations
Channel state information
Multiplexing
Topology
Feedback
2 Citations (Scopus)

Joint interference alignment and power allocation under perfect and imperfect CSI

Panahi, F. H., Ohtsuki, T., Jiang, W., Takatori, Y. & Uehara, K., 2016, 2016 IEEE Global Communications Conference, GLOBECOM 2016 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 7841926

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Channel state information
Base stations
Multiplexing
Topology
Feedback

Radio spectrum transmission using compressed sensing for a flexible wireless system

Lee, D., Yamada, T., Shiba, H., Yamagu-Chi, Y., Nakagawa, T. & Uehara, K., May 1 2016, In : Journal of the Institute of Electronics, Information and Communication Engineers. 99, 5, p. 450-455 6 p.

Research output: Contribution to journalArticle

Compressed sensing
2015

Concurrent multi-band mixer with independent and linear gain control

Kaho, T., Yamaguchi, Y., Shiba, H., Nakagawa, T., Uehara, K. & Araki, K., Jul 1 2015, In : IEICE Transactions on Electronics. E98C, 7, p. 659-668 10 p.

Research output: Contribution to journalArticle

Gain control
Power control
2 Citations (Scopus)

Dependency on beamwidth in an SD method utilizing two-ray fading characteristics

Hiraga, K., Sakamoto, K., Arai, M., Seki, T., Toshinaga, H., Nakagawa, T. & Uehara, K., Jan 29 2015, In : IEEE Antennas and Wireless Propagation Letters. 14, p. 56-59 4 p., 6891136.

Research output: Contribution to journalArticle

Channel capacity
Antennas
Horn antennas
Ray tracing
Microstrip antennas
2014
3 Citations (Scopus)

An SD method utilizing null dependency on transmission distance due to two-ray fading

Hiraga, K., Sakamoto, K., Arai, M., Seki, T., Nakagawa, T. & Uehara, K., 2014, In : IEEE Antennas and Wireless Propagation Letters. 13, p. 126-129 4 p., 6701188.

Research output: Contribution to journalArticle

Antenna grounds
Channel capacity
Antenna arrays
Signal processing
Costs
2 Citations (Scopus)

A study of short-range MIMO transmission utilizing polarization multiplexing for the simplification of decoding

Hiraga, K., Sakamoto, K., Nishimori, K., Seki, T., Nakagawa, T. & Uehara, K., 2014, In : IEICE Transactions on Communications. E97-B, 2, p. 459-468 10 p.

Research output: Contribution to journalArticle

Multiplexing
Decoding
Polarization
Degradation
Channel capacity

Spatial division transmission without signal processing for MIMO detection utilizing two-ray fading

Hiraga, K., Sakamoto, K., Arai, M., Seki, T., Nakagawa, T. & Uehara, K., Nov 1 2014, In : IEICE Transactions on Communications. E97B, 11, p. 2491-2501 11 p.

Research output: Contribution to journalArticle

Channel capacity
Signal processing
Polarization
Antennas
Multiplexing
2 Citations (Scopus)

Study on MIMO transmission using orthogonal directivities obtained from higher order microstrip antenna modes

Arai, M., Seki, T., Hiraga, K., Sakamoto, K., Toshinaga, H., Nakagawa, T. & Uehara, K., Mar 27 2014, In : Electronics Letters. 50, 7, p. 562-564 3 p.

Research output: Contribution to journalArticle

Microstrip antennas
MIMO systems
Antennas
Numerical analysis
Communication systems
5 Citations (Scopus)

Theoretical and experimental analysis of spatial division using antenna directivities in short-range MIMO transmission

Arai, M., Seki, T., Hiraga, K., Nakagawa, T. & Uehara, K., Jan 16 2014, In : Electronics Letters. 50, 2, p. 65-67 3 p.

Research output: Contribution to journalArticle

Antennas
Signal processing
Channel capacity
Signal interference
Antenna arrays
2013
6 Citations (Scopus)

A broadband low-noise wide dynamic range SiGe front-end receiver IC for multi-band access points

Kaho, T., Yamaguchi, Y., Shiba, H., Kawashima, M., Toshinaga, H. & Uehara, K., 2013, 2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013. p. 267-269 3 p. 6695115

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Low noise amplifiers
Gain control
Buffer amplifiers
Mixer circuits
Noise figure
2 Citations (Scopus)

A new architecture for concurrent dual-band digital predistortion

Ando, I., Tran, G. K., Araki, K., Yamada, T., Kaho, T., Yamaguchi, Y. & Uehara, K., 2013, 2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013. p. 152-154 3 p. 6695221

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Broadband amplifiers
Power amplifiers
Linearization
Feedback
Costs
3 Citations (Scopus)

An SDM method utilizing height pattern due to two-ray fading characteristics

Hiraga, K., Sakamoto, K., Arai, M., Seki, T., Nakagawa, T. & Uehara, K., 2013, In : IEEE Antennas and Wireless Propagation Letters. 12, p. 1622-1626 5 p., 6680603.

Research output: Contribution to journalArticle

Multiplexing
Channel capacity
Antenna arrays
Bandwidth
Signal processing
3 Citations (Scopus)

Current status, issues, and future perspective of wireless home networks

Takatori, Y., Mizoguchi, M., Uehara, K., Yoshino, S., Harada, M. & Okada, K., Mar 2013, In : NTT Technical Review. 11, 3

Research output: Contribution to journalReview article

Home networks
Innovation
1 Citation (Scopus)

Nonlinear modeling and analysis on concurrent amplification of dual-band gaussian signals

Ando, I., Tran, G. K., Araki, K., Yamada, T., Kaho, T., Yamaguchi, Y. & Uehara, K., Oct 2013, In : IEICE Transactions on Electronics. E96-C, 10, p. 1254-1262 9 p.

Research output: Contribution to journalArticle

Power amplifiers
Amplification
Broadband amplifiers
Orthogonal frequency division multiplexing
Nonlinear distortion
4 Citations (Scopus)

Performance evaluation of short-range MIMO using a method for controlling phase difference between each propagation channel

Sakamoto, K., Hiraga, K., Seki, T., Nakagawa, T. & Uehara, K., Oct 2013, In : IEICE Transactions on Communications. E96-B, 10, p. 2513-2520 8 p.

Research output: Contribution to journalArticle

MIMO systems
Antenna arrays
Decoding
Quadrature phase shift keying
Error correction
2 Citations (Scopus)

Study on short-range MIMO transmission using interference cancellation by antenna directivities

Arai, M., Seki, T., Hiraga, K., Nakagawa, T. & Uehara, K., 2013, 2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013. p. 395-397 3 p. 6695158

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Channel capacity
Antennas
Bandwidth
Beamforming
Millimeter waves
2012
3 Citations (Scopus)

1-bit compressed sensing with edge detection for compressed radio wave data transfer

Yamada, T., Lee, D., Toshinaga, H., Akabane, K., Yamaguchi, Y. & Uehara, K., 2012, APCC 2012 - 18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation". p. 407-411 5 p. 6388170

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Compressed sensing
Radio waves
Edge detection
Data transfer
Servers
3 Citations (Scopus)

A dual-band simultaneous receiving mixer with independent and linear gain control

Kaho, T., Yamaguchi, Y., Shiba, H., Akabane, K. & Uehara, K., 2012, 2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings. p. 160-162 3 p. 6421532

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gain control
Power control
Topology
1 Citation (Scopus)

A method for controlling phase difference between propagation channels for short-range MIMO transmission

Sakamoto, K., Hiraga, K., Seki, T., Nakagawa, T. & Uehara, K., 2012, Conference Proceedings of the 2012 International Symposium on Antennas and Propagation, ISAP 2012. p. 754-757 4 p. 6393964

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Local area networks
Transmitters
Antennas
Bandwidth
Communication
6 Citations (Scopus)

Effectiveness of short-range MIMO using dual-polarized antenna

Hiraga, K., Seki, T., Nishimori, K. & Uehara, K., Jan 2012, In : IEICE Transactions on Communications. E-95-B, 1, p. 87-96 10 p.

Research output: Contribution to journalArticle

MIMO systems
Channel capacity
Antennas
Antenna arrays
Beamforming
1 Citation (Scopus)

Signal separation and reconstruction method for simultaneously received multi-system signals in flexiblewireless system

Yamada, T., Lee, D., Shiba, H., Yamaguchi, Y., Akabane, K. & Uehara, K., Apr 2012, In : IEICE Transactions on Communications. E95-B, 4, p. 1085-1092 8 p.

Research output: Contribution to journalArticle

Signal systems
Signal processing
Interference suppression
Radio waves
Fourier transforms
1 Citation (Scopus)

Sparse-matrix-based compressed sensing for spectrum sensing in Flexible Wireless System

Lee, D., Kabashima, Y., Takeda, K., Yamada, T., Akabane, K. & Uehara, K., 2012, APCC 2012 - 18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation". p. 418-422 5 p. 6388172

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Compressed sensing
Servers
Signal processing
Radio waves
Adders
Heterogeneous networks
Cognitive radio
Wireless networks
8 Citations (Scopus)

Spectrum sensing for networked system using 1-bit compressed sensing with partial random circulant measurement matrices

Lee, D., Sasaki, T., Yamada, T., Akabane, K., Yamaguchi, Y. & Uehara, K., 2012, IEEE 75th Vehicular Technology Conference, VTC Spring 2012 - Proceedings. 6240259

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Compressed sensing
Spectrum Sensing
Compressed Sensing
Partial
Circulant Matrix
2011
1 Citation (Scopus)

A low-noise, high-gain quasi-millimeter-wave receiver MMIC with a very high degree of integration using 3D-MMIC technology

Kaho, T., Yamaguchi, Y., Uehara, K. & Araki, K., Oct 2011, In : IEICE Transactions on Electronics. E94-C, 10, p. 1548-1556 9 p.

Research output: Contribution to journalArticle

Monolithic microwave integrated circuits
Millimeter waves
Frequency bands
Demodulators
Field effect transistors
12 Citations (Scopus)

A simultaneous receiving multi-band mixer with independent gain control

Kaho, T., Yamaguchi, Y., Shiba, H., Akabane, K., Uehara, K. & Araki, K., 2011, Asia-Pacific Microwave Conference Proceedings, APMC 2011. p. 383-386 4 p. 6173766

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gain control
Power control
Diodes
2 Citations (Scopus)

Compressed sensing technology for flexible wireless system

Lee, D., Yamada, T., Shiba, H., Yamaguchi, Y. & Uehara, K., Mar 2011, In : NTT Technical Review. 9, 3

Research output: Contribution to journalArticle

Compressed sensing
Radio waves
Data compression
Inverse problems
Signal processing
1 Citation (Scopus)

High speed parallel data transmission and power transmission technology for wireless repeater system

Seki, T., Hiraga, K., Nishimori, K., Nishikawa, K. & Uehara, K., 2011, Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. p. 3913-3916 4 p. 5782427

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Telecommunication repeaters
Power transmission
Data communication systems
Insertion losses
Millimeter waves
4 Citations (Scopus)

Signal separation and reconstruction method for simultaneously received multi-system signals in a unified wireless system

Yamada, T., Lee, D., Shiba, H., Yamaguchi, Y. & Uehara, K., 2011, Proceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011. p. 136-140 5 p. 6030763

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Signal systems
reconstruction
Radio waves
computer simulation
Fourier transforms

Welcome from the general chairs

Uehara, K. & Di Benedetto, M. G., 2011, In : Unknown Journal. 6030734.

Research output: Contribution to journalEditorial

2010
2 Citations (Scopus)

A compact K/Ka-band transceiver MMIC using GaAs 3D-MMIC technology

Kaho, T., Yamaguchi, Y. & Uehara, K., 2010, 2010 Asia-Pacific Microwave Conference Proceedings, APMC 2010. p. 822-825 4 p. 5728467

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Monolithic microwave integrated circuits
Transceivers
Frequency doublers
Thermal noise
Noise figure
2 Citations (Scopus)

An analysis of multi-layer inductors for miniaturizing of GaAs MMIC

Yamaguchi, Y., Kaho, T., Sasaki, M., Nishikawa, K., Seki, T., Nakagawa, T., Uehara, K. & Araki, K., Jul 2010, In : IEICE Transactions on Electronics. E93-C, 7, p. 1119-1125 7 p.

Research output: Contribution to journalArticle

Monolithic microwave integrated circuits
Inductance
Microwave amplifiers
Electromagnetic fields
Natural frequencies
9 Citations (Scopus)

Combined Nyquist and compressed sampling method for radio wave data compression of a heterogeneous network system

Lee, D., Yamada, T., Shiba, H., Yamaguchi, Y. & Uehara, K., Dec 2010, In : IEICE Transactions on Communications. E93-B, 12, p. 3238-3247 10 p.

Research output: Contribution to journalArticle

Radio waves
Heterogeneous networks
Data compression
Decoding
Sampling
4 Citations (Scopus)

Multi-layer coupled band-pass filter for 60 GHz LTCC system-on-package

Hiraga, K., Seki, T., Nishikawa, K. & Uehara, K., 2010, 2010 Asia-Pacific Microwave Conference Proceedings, APMC 2010. p. 259-262 4 p. 5728695

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bandpass filters
Multilayers
Substrates
Fabrication
Millimeter waves

Special section on wireless distributed networks

Uehara, K., Dec 2010, In : IEICE Transactions on Communications. E93-B, 12, p. 3217 1 p.

Research output: Contribution to journalEditorial

2 Citations (Scopus)

Ultra compact RFICs using three-dimensional MMIC technology

Kaho, T., Yamaguchi, Y., Nishikawa, K., Toyoda, I. & Uehara, K., 2010, 2010 IEEE MTT-S International Microwave Symposium, MTT 2010. p. 1304-1307 4 p. 5517752

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microwave integrated circuits
microwave circuits
integrated circuits
Millimeter waves
millimeter waves
1 Citation (Scopus)

Ultra-high-speed transmission over millimeter-wave using microstrip antenna array

Hiraga, K., Seki, T., Nishimori, K., Nishikawa, K. & Uehara, K., 2010, 2010 IEEE Radio and Wireless Symposium, RWW 2010 - Paper Digest. p. 673-676 4 p. 5434243

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Channel capacity
Microstrip antennas
Antenna arrays
Millimeter waves
Antennas
2009
4 Citations (Scopus)

60-GHz microstrip antenna with stacked rings using multi-layer LTCC substrate

Seki, T., Hiraga, K., Nishikawa, K. & Uehara, K., 2009, European Conference on Antennas and Propagation, EuCAP 2009, Proceedings. p. 3797-3800 4 p. 5068416

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microstrip antennas
Antennas
simulation
Substrates
performance
2 Citations (Scopus)

A compact X-band balanced frequency doubler on GaAs pHEMT 3D MMIC

Kaho, T., Yamaguchi, Y., Okazaki, H. & Uehara, K., 2009, 2009 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2009. p. 237-240 4 p. 5383706

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Frequency doublers
Monolithic microwave integrated circuits
Bandpass filters
Microstrip lines
Electric power utilization

Lens-coupled imaging arrays for the millimeter-and submillimeter-wave regions

Uehara, K., Miyashita, K., Natsume, K. I., Hatakeyama, K. & Mizuno, K., Jan 1 2009, Active Antennas and Quasi-Optical Arrays. John Wiley and Sons Inc., p. 198-203 6 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Submillimeter waves
submillimeter waves
Millimeter waves
millimeter waves
Lenses

Small size base station antenna using phase difference feed for narrowband ubiquitous communication

Seki, T., Hiraga, K., Nishikawa, K. & Uehara, K., 2009, IEEE MTT-S International Microwave Workshop Series on Wireless Sensing, Local Positioning and RFID - Proceedings, IMWS 2009 - Croatia. 5307864

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antenna feeders
Base stations
Antennas
Communication
Antenna arrays
11 Citations (Scopus)

Towards ultrahigh-speed high-capacity networks

Jinno, M., Kimura, H., Hibino, Y., Uehara, K., Kukutsu, N., Ito, F. & Matsuoka, S., May 2009, In : NTT Technical Review. 7, 5

Research output: Contribution to journalArticle

Photonics
Bandwidth

Ultra high speed short-range parallel transmission using millimeter-wave frequency band

Hiraga, K., Seki, T., Nishimori, K., Nishikawa, K. & Uehara, K., 2009, APMC 2009 - Asia Pacific Microwave Conference 2009. p. 1212-1215 4 p. 5384427

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Millimeter waves
Frequency bands
Channel capacity
Antennas
Antenna arrays
2008
8 Citations (Scopus)

A cooperative sensing technique with weighting based on distance between radio stations

Matsui, M., Shiba, H., Akabane, K. & Uehara, K., 2008, 2008 14th Asia-Pacific Conference on Communications, APCC 2008. 4773672

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radio stations
Radio waves
Cognitive radio
weighting
radio
3 Citations (Scopus)

A very low spurious X-band frequency quadrupler with very high integration using 3D-MMIC technology

Yamaguchi, Y., Kaho, T. & Uehara, K., Nov 2008, In : IEICE Transactions on Electronics. E91-C, 11, p. 1744-1750 7 p.

Research output: Contribution to journalArticle

Monolithic microwave integrated circuits
Frequency bands
Notch filters
Integrated circuits
Energy dissipation