久保田 周治

研究成果

年別の研究成果 1982 1992 1993 1994 1995 2000 2007 2017

• 2042 被引用数
• 18 h-index
• 217 Article
• 36 Conference contribution
• 19 Paper
• 12 Conference article
• 1 その他
  • 1 Review article

年別の研究成果

年別の研究成果

検索結果

• Article

  A TDMA Satellite Communication System for ISDN Services

  Kato, S., Morikura, M., Kubota, S., Kazama, H., Enomoto, K. & Umehira, M., 1992 2, In: IEEE Journal on Selected Areas in Communications. 10, 2, p. 456-464 9 p.

  研究成果: Article › 査読

  • Satellite communication systems 100%
  • Voice/data communication systems 95%
  • Quadrature phase shift keying 93%
  • Time division multiple access 90%
  • Modems 88%
  11 被引用数 (Scopus)

• A Time Division Multiple Access - Time Division Duplex Combined with Alternated Frequency Duplexer for Wireless Personal Communications

  Kawazoe, K. & Kubota, S., 1996 11 1, In: IEICE Transaction on Communications.

  研究成果: Article › 査読

• A time division multiple access - Time division duplex combined with an alternated frequency duplexer for wireless personal communications

  Kawazoe, K. & Kubota, S., 1996 1 1, In: IEICE Transactions on Communications. E79-B, 11, p. 1688-1695 8 p.

  研究成果: Article › 査読

  • Time division multiple access 100%
  • Communication 44%
  • Speech transmission 15%
  • Multipath fading 12%
  • Blocking probability 12%

• A Very Low Power and High-Quality Signal Transmission Baseband LSIC for Personal Communications -Advanced Signal Processing and One-chip Integration-

  Kato, S., Kubota, S., Seki, K., Enomoto, K., Kawazoe, K., Sakata, T., Kobayashi, K. & Matsumoto, Y., 1994 12 1, In: IEEE International Conference on Global Communications (Globecom'94).

  研究成果: Article › 査読

• A Very Low Power Consumption ADPCM Voice Codec LSIC for Personal Communication Systems

  Enomoto, K., Dobashi, A., Suzuki, M., Hasumi, T., Seki, K., Kubota, S. & Kato, S., 1994 9 1, In: IEEE International Symposium on Personal Indoor Mobile Radio Communications (PIMRC'94). p. 481-485

  研究成果: Article › 査読

  1 被引用数 (Scopus)

• A Voice Transmission Quality Improvement Scheme for Personal Communication Systems -Super-Mute Scheme-

  Suzuki, M. & Kubota, S., 1995 11 1, In: IEEE International Conference on Universal Personal Communications (ICUPC'95). p. 713-717

  研究成果: Article › 査読

  1 被引用数 (Scopus)

• Bit significance selective frequency diversity transmission

  Kumagai, T., Kobayashi, K., Kawazoe, K. & Kubota, S., 1998, In: IEICE Transactions on Communications. E81-B, 3, p. 545-552 8 p.

  研究成果: Article › 査読

  • Fading channels 100%
  • Bit error rate 99%

• Bit Significance Selective Frequency Diversity Transmission -Voice Quality Improvement in Fading Channels-

  Kumagai, T., Kobayashi, K., Kawazoe, K. & Kubota, S., 1996 9 1, In: IEEE International Conference on Universal Personal Communications (ICUPC'96). p. 0910-0914

  研究成果: Article › 査読

• Bit-stream-arranged weighted modulation scheme for low delay spread frequency selective fading channels

  Kobayashi, K. & Kubota, S., 1998, In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. E81-A, 7, p. 1452-1458 7 p.

  研究成果: Article › 査読

  • Fading Channels 100%
  • Frequency selective fading 81%
  • Modulation 80%
  • Fading channels 61%
  • Voice 55%

• Burst Mode Interference Cancellation for Superposed Transmission of SSMA-QPSK Signal and High-Speed TDMA Signal

  Sugiyama, T., Kazama, H., Morikura, M., Kato, S. K. & Kubota, S., 1993 12 1, In: IEEE International Conference on Global Communications (Globecom'93). p. .1612-1616

  研究成果: Article › 査読

• Classical and Recent Understandings of X-ray Spectra of Bright Black Hole Binaries

  Kubota, A., 2005 1 25, In: International Workshop on MHD Accretion Flows and Jets.

  研究成果: Article › 査読

• Common Carrier Activities in SDR: Prototype Implementation of SDR Systems

  Kubota, S., Uehara, K. & Nakatsugawa, M., 2000 4 1, In: Default journal. p. 161-173

  研究成果: Article › 査読

• Common Transmission of High Speed QPSK Signal and SSMA Signal over Nonlinearly Amplified Transponder

  Enomoto, K., Morikura, M., Kubota, S. & Kato, S., 1991 5 1, In: IEICE Transaction on Communications.

  研究成果: Article › 査読

• Compact, High-speed and High-coding-gain General Purpose FEC Encoder/Decoder -NUFEC CODEC-

  Kubota, S., Kato, S., Ishitani, T. & Nagatani, M., 1989 6 1, In: IEEE International Conference on Communications (ICC'89).

  研究成果: Article › 査読

  12 被引用数 (Scopus)

• Compact 60-GHz LTCC Stripline Parallel-Coupled Bandpass Filter with Prastic Elements for Millimeter-Wave System-on-Package

  Nishikawa, K., Seki, T., I.Toyoda, I. T. & Kubota, S., 2007 6 1, In: IEEE International Microwave Symposium (IMS'2007). p. 1649-1652

  研究成果: Article › 査読

  17 被引用数 (Scopus)

• Compact and High Performance TDMA Terminal for Satellite Communication

  Kato, S., Morikura, M., Umehira, M., Enomoto, K. & Kubota, S., 1988 6 1, In: IEEE International Conference on Communications (ICC'88).

  研究成果: Article › 査読

  3 被引用数 (Scopus)

• Compact LSI- and IC-Implemented Burst Modem for Low Eb/No Operation

  Umehira, M., Kubota, S., Enomoto, K. & Kato, S., 1987 11 1, In: International Conference on Global Communications (Globecom'87).

  研究成果: Article › 査読

• Compact six-sector antenna using three intersecting dual-beam microstrip Yagi-Uda arrays with common director

  Honma, N., Seki, T., Nishikawa, K. & Kubota, S., 2007 3 1, In: NTT Technical Review. 5, 3, p. 72-81 10 p.

  研究成果: Article › 査読

  • Antennas 100%
  • Antenna arrays 32%
  • Directional patterns (antenna) 18%
  • Wavelength 15%
  • Numerical analysis 14%

• Comparison of SCFDE and OFDM with adaptive modulation and coding in nonlinear fading channel

  Ishihara, K., Takatori, Y., Kubota, S. & Umehira, M., 2007 5 18, In: Electronics Letters. 43, 3, p. 174-175 2 p.

  研究成果: Article › 査読

  • Carrier communication 100%
  • Adaptive modulation 91%
  • Fading channels 66%
  • Orthogonal frequency division multiplexing 64%
  • Throughput 49%
  9 被引用数 (Scopus)

• Concatenated Coding Scheme Employing Soft Decision for Outer Codes -DSD Concatenated Coding Scheme-

  Kubota, S., Honda, S., Morikura, M. & Kato, S., 1991 6 1, In: IEEE International Conference on Communications (ICC'91).

  研究成果: Article › 査読

• Cooperative Interference Cancellation for Secondary Spectrum Usage

  Popovski, P., Prasad, R. & Kubota, S., 2007 7 1, In: Default journal.

  研究成果: Article › 査読

• DCF Reverse Modulation Type Carrier Recovery Circuit for Rician Fading Channel

  Sakai, T., Kobayashi, K., Kubota, S., Morikura, M. & Kato, S., 1991 12 1, In: IEEE International Conference on Global Communications (Globecom'91).

  研究成果: Article › 査読

• Deployment of Broadband Internet Access Employing Fiber to the Wireless in Japan

  Kubota, S., 2004 6 1, In: Default journal.

  研究成果: Article › 査読

• Design and Performance Evaluation of Software Radio for PHS and IEEE802.11 Wireless LANs

  Uehara, K., Shiba, K. UH., Shono, T., Shirato, Y., Yoshioka, H., Nakatsugawa, M., Kubota, S. & Umehira, M., 2002 9 1, In: IEEE International Symposium on Personal Indoor Mobile Radio Communications（PIMRC'2002）.

  研究成果: Article › 査読

• Detailed spectral study of an ultra-luminous compact X-ray source M81 X-9 in the disk dominated

  Tsunoda, N., Kubota, A., Namiki, M., sugiho, M., Kawabata, K. & Mikishima, K., 2006 12 1, In: Publications of the Astronomical Society of Japan. 58

  研究成果: Article › 査読

• Development of hard X-ray polarimeter for gamma-ray bursts

  Gunji, S., Suzuki, T., Sato, F., Sakurai, H., Tokanai, F., Saito, Y. & Kubota, A., 2004 4 1, In: Advances in Space Research. 33, p. 1771-1776

  研究成果: Article › 査読

  8 被引用数 (Scopus)

• Development of the large area silicon PIN diode with 2mm-thick depletion layer for Hard X-ray Detector (HXD) on-board Astro-E

  Sugisaki, M., Kubo, S., Murakami, T., Ohta, N., Ozawa, H., Takahashi, T., Iyomoto, H. K., ?6? ?24??11??, . . & Kubota, S., 1997 7 1, In: SPIE. 3115, p. 244-253

  研究成果: Article › 査読

• Development of Traffic Control Mechanisms for IEEE802.11 Wireless LAN without QoS Support Functionality

  Hiraguri, T., Inoue, Y., Ichikawa, T. & Kubota, S., 2004 9 1, In: 1ST International Symposium on Wireless Communication Systems (ISWCS'2004). p. 383-387

  研究成果: Article › 査読

  1 被引用数 (Scopus)

• Discovery of a Bright Transient Ultraluminous X-Ray Source, Suzaku J1305-4931 in NGC4945

  Isobe, I., N., N., Kubota, K., A., A., Makishima, M., K., K., G, G., hi, H., P., P., Griffiths, G., E., R., Dewangan, D., C., G., Itoh, I., T., T. & Mizuno, M., 2008 2 1, In: Publications of the Astronomical Society of Japan. 60, p. 241-250

  研究成果: Article › 査読

• Discovery of A New X-Ray Jet of PKS2201 + 044 and Its Emission Mechanism

  Urry, C. M., VanDuyne, J., C.C.Cheung, C. C. C., R.M.Smbruna, R. M. S., J.E.Pesce, J. E. P., Maraschi, L., F.Tavecchio, F. T. & Kubota, S., 2003 3 24, In: Default journal.

  研究成果: Article › 査読

• DSD (Double Soft Decision) Concatenated FEC Scheme in Mobile Satellite Communication Systems

  Honda, S., Kubota, S. & Kato, S., 1992 10, In: IEEE Journal on Selected Areas in Communications. 10, 8, p. 1271-1277 7 p.

  研究成果: Article › 査読

  • Satellite communication systems 100%
  • Mobile telecommunication systems 91%
  • Forward error correction 74%
  • Decoding 67%
  • Fading channels 36%
  3 被引用数 (Scopus)

• DSD Concatenated FEC Scheme in Mobile Satellite Communication Systems

  Honda, S., Kubota, S. & Kato, S., 1992 5 1, In: International Symposium on Space Technology and Science (ISTS'92). p. .1641-1646

  研究成果: Article › 査読

• DYANET II, Satellite TDMA System for DYANET II

  Kato, K., Kato;Morikura;Kubota;Kazama;Enomoto, KMKKE. & Kubota, S., 1992 11 1, In: NTT Review. 4, p. 53-61

  研究成果: Article › 査読

• Effectiveness of Multi-user MIMO System with Fair Resource Allocation in Actual Indoor Propagation Environment

  Kubota, S., 2007 3 1, In: Default journal.

  研究成果: Article › 査読

• Effectiveness of Terminal Antennas Employing Orthogonal Polarizations and Patterns in Outdoor Multiuser MIMO System

  Honma, N., Kudo, R., Nishimori, K., Takatori, Y., Ohta, A. & Kubota, S., 2007 2 1, In: ITG/IEEE Workshop on Smart Antenna (WSA 2007). p. 5325

  研究成果: Article › 査読

• Enhanced Simplified Maximum Likelihood Detection (ES-MLD) in Multiuser MIMO Downlink in Time-Variant Environment

  T.Yamada, T. Y., Jiang, W., Takatori, Y., Kudo, R., Ohta, A. & Kubota, S., 2007 2 1, In: ITG/IEEE Workshop on Smart Antenna (WSA 2007).

  研究成果: Article › 査読

• Excess hard X-ray emission from the obscured low luminosity AGN in the nearby galaxy M 51 (NGC5194)

  Fukazawa, Y., Iyomoto, N., Kubota, A., Matsumoto, Y. & Makishima, K., 2001 7 1, In: Astronomy and Astrophysics. 374, p. 73-82

  研究成果: Article › 査読

• Fabrication of the ASTRO-E Hard X-Ray Detector

  Nakazawa, K., Kamae, T., Mikishima, K., Takahashi, T., Murakami, T., Tashiro, M., Fukuzawa, Y., Tamura, T., ?26? ?34??17??, . . & Kubota, S., 1999 10 1, In: SPIE. 3765, p. 148-159

  研究成果: Article › 査読

  21 被引用数 (Scopus)

• Frequency utilization efficiency improvement on superposed SSMA-QPSK signal transmission over high speed QPSK signals in nonlinear channels

  Sugiyama, T., Kazama, H., Morikura, M., Kubota, S. & Kato, S., 1993 5 1, In: IEICE Transactions on Communications. E76-B, 5, p. 480-487 8 p.

  研究成果: Article › 査読

  • Quadrature phase shift keying 100%
  • Forward error correction 11%
  • Signal interference 9%
  • Transmitters 7%
  • Computer hardware 5%
  11 被引用数 (Scopus)

• Fully digital burst modem for satellite multimedia communication systems

  Kobayashi, K., Sakata, T., Matsumoto, Y. & Kubota, S., 1997, In: IEICE Transactions on Communications. E80-B, 1, p. 8-15 8 p.

  研究成果: Article › 査読

  • Modems 100%
  • Communication systems 71%
  • Satellites 69%
  • Detectors 35%
  • Demodulators 27%
  3 被引用数 (Scopus)

• Future Systems and Technologies for Broadband Wireless Access Services

  Matsue, M., Kubota, K., Hojo, H., Watanabe, W., Saito, S., Aikawa, A. & Sato, S., 2003 10 1, In: IEEE Topical Conference on Wireless Communication Technology 2003. p. 156-157

  研究成果: Article › 査読

  7 被引用数 (Scopus)

• Galactic Black Holes and The Relation to The ULXs

  Kubota, A., 2004 6 1, In: The 5th Microquasar Workshop, Beijing, China.

  研究成果: Article › 査読

• General Purpose High-Speed Multi-Function TDMA LSIC Development

  Kazama, H., Enomoto, K., Morikura, M., Kubota, S. & Kato, S., 1992 5 1, In: International Conference on Digital Satellite Communications (ICDSC-9). p. 63-68

  研究成果: Article › 査読

• General Purpose TDMA LSI Development for Low Cost Earth Station

  Kato, S., Morikura, M., Umehira, M. & Kubota, K. E., 1986 6 1, In: IEEE International Conference on Communications (ICC'86).

  研究成果: Article › 査読

  3 被引用数 (Scopus)

• High capacity and wide coverage cell station for personal communication systems

  Kobayashi, K., Kumagai, T., Kubota, S., Ogose, S. & Hattori, T., 1999, In: IEICE Transactions on Communications. E82-B, 1, p. 112-118 7 p.

  研究成果: Article › 査読

  • Personal communication systems 100%
  • Demodulators 49%
  • Power transmission 39%
  • Transceivers 38%
  • Antennas 26%
  1 被引用数 (Scopus)

• High Performance Coherent Demodulator LSIC for Wireless Personal Communication

  Matsumoto, Y., Kubota, S. & Kato, S., 1996 8 1, In: IEEE Transaction on Vehicle Technology.

  研究成果: Article › 査読

  1 被引用数 (Scopus)

• High-performance coherent demodulator lsic for wireless personal communications

  Matsumoto, Y., Kubota, S. & Kato, S., 1996, In: IEEE Transactions on Vehicular Technology. 45, 3, p. 475-483 9 p.

  研究成果: Article › 査読

  • High Performance 100%
  • Demodulators 93%
  • Error Rate 87%
  • Power Consumption 83%
  • Communication 70%
  1 被引用数 (Scopus)

• High-Quality and Very Low Power Consumption One-chip Baseband LSIC for Personal Handy Phone System

  Mizoguchi, M., Sakata, T., Kobayashi, K., Matsumoto, Y., Kubota, S. & Kato, S., 1995 9 1, In: IEEE International Symposium on Personal Indoor Mobile Radio Communications (PIMRC'95). p. 1262-1266

  研究成果: Article › 査読

• High-Quality Frame-Synchronization for Satellite Video Signal Transmission

  Kubota, S., Morikura, M. & Kato, S., 1995 1, In: IEEE Transactions on Aerospace and Electronic Systems. 31, 1, p. 430-435 6 p.

  研究成果: Article › 査読

  • Freezing 100%
  • Synchronization 73%
  • Satellites 71%
  • Digital to analog conversion 47%

• High-Quality Signal Transmission Techniques for Personal Communication Systems -Novel Coherent Demodulation and ADPCM Voice Transmission with Click Noise Detection-

  Kobayashi, K., Sakata, T., Matsumoto, Y., Enomoto, K., Kubota, S. & Kato, S., 1995 7 1, In: IEEE International Conference on Vehicle Technology (VTC'95). p. 733-737

  研究成果: Article › 査読

  9 被引用数 (Scopus)