• 527 Citations
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1988 …2019
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Research Output 1988 2019

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Article
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

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
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
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
2012
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
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
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
2010
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
2009
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
2008
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
1 Citation (Scopus)

Performance evaluation of an autonomous adaptive base station that supports multiple wireless network systems

Akabane, K., Shiba, H., Matsui, M. & Uehara, K., 2008, In : IEICE Transactions on Communications. E91-B, 1, p. 22-28 7 p.

Research output: Contribution to journalArticle

Base stations
Wireless networks
Radio waves
Wave transmission
Telecommunication traffic
2005
20 Citations (Scopus)

IEEE 802.11 wireless LAN implemented on software defined radio with hybrid programmable architecture

Shono, T., Shirato, Y., Shiba, H., Uehara, K., Araki, K. & Umehira, M., Sep 2005, In : IEEE Transactions on Wireless Communications. 4, 5, p. 2299-2308 10 p.

Research output: Contribution to journalArticle

Wireless Local Area Network (WLAN)
IEEE 802.11
Wireless LAN
Wireless local area networks (WLAN)
Local area networks
Voice/data communication systems
Switching circuits
Packet switching
Electronic mail
Middleware
2004
26 Citations (Scopus)

Fabrication of 5-GHz-band SAW filter with atomically-flat-surface AlN on sapphire

Uehara, K., Yang, C. M., Shibata, T., Kim, S. K., Kameda, S., Nakase, H. & Tsubouchi, K., 2004, In : Unknown Journal. 1, p. 203-206 4 p.

Research output: Contribution to journalArticle

Acoustic surface wave filters
Sapphire
Surface waves
Acoustic wave propagation
Fabrication
2 Citations (Scopus)

Growth of AlN film on Mo/SiO2/Si (111) for 5GHz-band FBAR using MOCVD

Yang, C. M., Uehara, K., Aota, Y., Kim, S. K., Kameda, S., Nakase, Y., Isota & Tsubouchi, K., 2004, In : Unknown Journal. 1, p. 165-168 4 p.

Research output: Contribution to journalArticle

Metallorganic chemical vapor deposition
Full width at half maximum
Natural frequencies
Acoustic resonators
Electromechanical coupling
2003
3 Citations (Scopus)

Adaptability Check during Software Installation in Software Defined Radio

Suzuki, Y., Harada, H., Uehara, K., Fujii, T., Yokoyama, Y., Oda, K. & Hidaka, R., Dec 2003, In : IEICE Transactions on Communications. E86-B, 12, p. 3401-3407 7 p.

Research output: Contribution to journalArticle

Radio equipment
Hardware
Radio receivers
10 Citations (Scopus)

AlN epitaxial film on 6H-SiC(0001) using MOCVD for GHz-band saw devices

Uehara, K., Yang, C. M., Furusho, T., Kim, S. K., Kameda, S., Nakase, H., Nishino, S. & Tsubouchi, K., 2003, In : Unknown Journal. 1, p. 905-908 4 p.

Research output: Contribution to journalArticle

Aluminum nitride
Epitaxial films
Metallorganic chemical vapor deposition
Silicon carbide
Phase velocity
15 Citations (Scopus)

Highly c-axis-oriented AlN film using MOCVD for 5GHz-band FBAR filter

Yang, C. M., Uehara, K., Kim, S. K., Kameda, S., Nakase, H. & Tsubouchi, K., 2003, In : Unknown Journal. 1, p. 170-173 4 p.

Research output: Contribution to journalArticle

Acoustic resonators
Aluminum nitride
Organic chemicals
Chemical vapor deposition
Metals
9 Citations (Scopus)

Performance of IEEE 802.11 Wireless LAN implemented on software defined radio with hybrid programmable architecture

Shono, T., Shiba, H., Shirato, Y., Uehara, K., Araki, K. & Umehira, M., 2003, In : Unknown Journal. 3, p. 2035-2040 6 p.

Research output: Contribution to journalArticle

Local area networks
Digital signal processors
Program processors
Field programmable gate arrays (FPGA)
Software architecture
2002
4 Citations (Scopus)

AlN epitaxial film with atomically flat surface for GHz-band saw devices

Uehara, K., Yang, C. M., Nakamura, H., Kameda, S., Nakase, H. & Tsubouchi, K., 2002, In : Unknown Journal. 1, p. 135-138 4 p.

Research output: Contribution to journalArticle

Epitaxial films
Acoustic surface wave devices
Temperature
Metallorganic chemical vapor deposition
Substrates

Proposal and evaluation of system diversity for software defined radio

Shono, T., Uehara, K. & Kubota, S., 2002, In : Unknown Journal. 1, p. 490-496 7 p.

Research output: Contribution to journalArticle

Communication systems
Channel capacity
Data communication systems
Quality of service
Signal processing
12 Citations (Scopus)

Software defined radio prototype for PHS and IEEE 802.11 wireless LAN

Shiba, H., Shono, T., Shirato, Y., Toyoda, I., Uehara, K. & Umehira, M., Dec 2002, In : IEICE Transactions on Communications. E85-B, 12, p. 2694-2702 9 p.

Research output: Contribution to journalArticle

Local area networks
Throughput
Bandwidth
Experiments
2 Citations (Scopus)

System re-configuration and over-the air download functions of the software radio prototype supporting PHS and wireless LAN

Shiba, H., Shono, T., Uehara, K. & Umehira, M., 2002, In : Unknown Journal. 56, 3, p. 1627-1631 5 p.

Research output: Contribution to journalArticle

Software radio
Local area networks
Air
Network protocols
Communication systems
2001

Design and evaluation of software radio prototype with over-the-air download function

Shiba, H., Shono, T., Uehara, K. & Kubota, S., 2001, In : Unknown Journal. 4, 54ND, p. 2466-2469 4 p.

Research output: Contribution to journalArticle

Software radio
Air
Data storage equipment
12 Citations (Scopus)

Proposal for system diversity on software defined radio

Shono, T., Uehara, K. & Kubota, S., Sep 2001, In : IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E84-A, 9, p. 2346-2358 13 p.

Research output: Contribution to journalArticle

Software
Wireless Communication
Communication systems
Communication Systems
Channel capacity
1 Citation (Scopus)

Standardization activities for software defined radio

Nakatsugawa, M., Sugita, M. & Uehara, K., 2001, In : NTT R and D. 50, 1, p. 57-62 6 p.

Research output: Contribution to journalArticle

Standardization
1 Citation (Scopus)

Trends in the research and development of software radio

Uehara, K., Nakatsugawa, M., Kubota, S. & Mizuno, H., 2001, In : NTT R and D. 50, 1, p. 33-40 8 p.

Research output: Contribution to journalArticle

Software radio
Digital circuits
2000
9 Citations (Scopus)

Flexible security systems and a new structure for electronic commerce on software radio

Sugita, M., Uehara, K. & Kubota, S., 2000, In : Unknown Journal. 6, 52 ND, p. 3033-3040 8 p.

Research output: Contribution to journalArticle

Software radio
Electronic commerce
Security systems
Radio systems
Flexible structures

Software radio base and personal stations for cellular/PCS systems

Nakatsugawa, M., Uehara, K., Suzuki, Y. & Kubota, S., 2000, In : Unknown Journal. 1, p. 617-621 5 p.

Research output: Contribution to journalArticle

Software radio
Program processors
Air
Base stations
Modulation
1999
4 Citations (Scopus)

Proposal for a novel beam combination method for indoor high-speed wireless communication systems

Uehara, K., Takatori, Y. & Kagoshima, K., 1999, In : IEEE Transactions on Vehicular Technology. 48, 5, p. 1511-1517 7 p.

Research output: Contribution to journalArticle

Wireless Communication
Base stations
Fans
Communication Systems
Communication systems
13 Citations (Scopus)
FDTD Method
Antenna Arrays
Monopole
Antenna arrays
Sector
1998
3 Citations (Scopus)
Horn antennas
Local area networks
Numerical analysis
Antennas
3 Citations (Scopus)

Miniaturization of base station antennas by using adaptive antenna technique for indoor high-speed wireless communication systems

Takatori, Y., Uehara, K. & Kagoshima, K., 1998, In : Unknown Journal. 1, p. 480-484 5 p.

Research output: Contribution to journalArticle

Base stations
Communication systems
Antennas
Bit error rate
Time delay
1997
3 Citations (Scopus)

Novel beam combination method for indoor high-speed wireless communication systems

Uehara, K. & Kagoshima, K., 1997, In : Unknown Journal. 3, p. 1758-1762 5 p.

Research output: Contribution to journalArticle

Base stations
Fans
Communication systems
Automatic teller machines
Local area networks
7 Citations (Scopus)

Planar sector antenna for indoor high-speed wireless communication terminals

Uehara, K., Seki, T. & Kagoshima, K., 1997, In : Unknown Journal. 2, p. 1352-1355 4 p.

Research output: Contribution to journalArticle

Antennas
Communication
Butler matrix
Antenna feeders
Networks (circuits)
7 Citations (Scopus)

Three-dimensional active antenna for a high-speed wireless communication application

Seki, T., Uehara, K. & Kagoshima, K., 1997, In : Unknown Journal. 2, p. 975-978 4 p.

Research output: Contribution to journalArticle

wireless communication
polyimides
Multilayers
antennas
high speed
1996
1 Citation (Scopus)

30-GHz multibeam antenna using bi-layer butler matrix circuits

Seki, T., Uehara, K. & Kagoshima, K., Dec 1996, In : IEICE Transactions on Communications. E79-B, 12, p. 1778-1783 6 p.

Research output: Contribution to journalArticle

Butler matrix
Multibeam antennas
Networks (circuits)
Method of moments
Communication systems
9 Citations (Scopus)

Analysis and design of multi-sector monopole Yagi-Uda array mounted on a ground plane using moment method

Maruyama, T., Uehara, K. & Kagoshima, K., 1996, In : Unknown Journal. 420, p. 289-294 6 p.

Research output: Contribution to journalArticle

Method of moments
Antennas
Multibeam antennas
Wire
Wavelength
Geometrical optics
Directional patterns (antenna)
Antennas
Omnidirectional antennas
Polarization
1 Citation (Scopus)

Miniatuarized dual polarization antenna for a small wireless terminal

Kagoshima, K., Uehara, K. & Hori, T., 1996, In : Unknown Journal. 2, p. 1092-1095 4 p.

Research output: Contribution to journalArticle

Polarization
Antennas
Radiation
Degradation