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NTT Network Innovation Laboratories

Research activities prior to 2010

●Ubiquitous Service Systems Laboratory

[Papers]

Tomohiro Inoue, Motonori Nakamura,
"Distributed personal storage system with flexible selection and replication mechanism,"
UIC 2006, pp.1090-1101, Sep. 2006.

Kaoru Nakazono, Yuji Nagashima, Akira Ichikawa,
"Digital Encoding Applied to Sign Language Video,"
IEICE TRANSACTIONS of Information and Systems, Vol.E89-D, No.6, pp.1893-1900, Jun. 2006.

Miyuki Imada, Masakatsu Ohta, Masayasu Yamaguchi,
"LooM: An Anonymity Quantification Method in Pervasive Computing Systems,"
AINA 2006, Volume 2, pp.92-96, Apr. 2006.

●Media Innovation Laboratory

[Papers]

Takahiro Murooka, Masashi Hashimoto, Toshiaki Miyazaki,
"A high time-resolution traffic monitoring system,"
IEICE(D) Vol.E87-D No.12 pp.2618-2626 Dec. 2004.

K. Obana, T. Shimizu, T. Murooka, K. Hayashi, and K. Oguchi,
"Evaluation of the MXQ Mechanism by Audio and Video Applications,"
APCC2004, Vol.2, No.29, pp.514-518, Aug. 2004.

T. Nakachi, T. Sawabe, J. Suzuki,and T. Fujii,
"A Study on Non-Octave Resolution Conversion based on JPEG2000 Extensions,"
ICASSP 2004, IMDSP-L3.6, May 2004.

H. Kimiyama, K. Shimizu, T. Kawano, T. Ogura, and M. Maruyama,
"Real-time Processing Method for an Ultra High-speed Streaming Server Running PC Linux," AINA 2004, Vol.2, pp.441-446, Mar. 2004.

K. Shimizu, T. Ogura, T. Kawano, H. Kimiyama, and M. Maruyama,
"Achieving Wire-Speed Protocol Processing in a Multi-Gbps Network using BSD UNIX and an OC-48c Network Interface Card,"
ICACT2004, Vol.1, pp.334-339, 2004.

O. Akashi, T. Sugawara, K. Murakami, M. Maruyama, N. Takahashi, and K. Koyanagi,
"Agent system for inter-AS routing error diagnosis,"
Internet Computing, IEEE, Vol.6 , No.3, pp.78-82, May 2002.

●Wireless Systems Innovation Laboratory

[Papers]

K. Nishimori, R.Kudo, N. Honma, Y. Takatori, A. Ohta, K.Okada,
"Experimental evaluation using 16x16 multiuser MIMO testbed in an actual indoor scenario,"
2008 IEEE Antennas and Propagation Society International Symposium, CD-digest, July 2008.

K.Nishimori, R.Kudo, Y.Takatori, A.Ohta, K. Tsunekawa,
"Performance Evaluation of 8x8 Multi-User MIMO-OFDM Testbed in an Actual Indoor Environment,"
Proc. of PIMRC2006, pp.1-5, Sept, 2006.


N. Honma, K. Nishimori, Y. Takatori, A. Ohta, and K. Tsunekawa,
"Proposal of compact three-port MIMO antenna employing modified inverted F antenna and notch antennas,"
2006 IEEE Antennas and Propagation Society International Symposium, pp.2613-1616, July 2006.

N. Honma, K. Nishimori,Y. Takatori, A. Ohta, S. Kubota,
"Antenna Selection Method Employing Orthogonal Polarization and Radiation Patterns for MIMO Antenna,"
The 1st European Conference on Antennas and Propagation (EUCAP 2006), ESA SP-626(609.1), Sept. 2006.

N. Honma, R. Kudo, K. Nishimori,Y. Takatori, A. Ohta, S. Kubota,
"Antenna Selection Method for Terminal Antennas Employing Orthogonal Polarizations and Patterns in Outdoor Multiuser MIMO System,"
IEICE Trans. Commun., vol E91-B, no.6, pp.1752-1759, June 2008.

N. Honma, R. Kudo, K. Nishimori,Y. Takatori, A. Ohta, S. Kubota,
"Proposal of antenna selection method for terminal antenna with orthogonal polarizations and patterns for outdoor multiuser MIMO system,"
2007 IEICE International Symposium on Antennas and Propagations, 4C1-4, Aug. 2007.

N. Honma, K. Nishimori,Y. Takatori, A. Ohta, S. Kubota,
"Proposal of compact MIMO terminal antenna employing Yagi-Uda array with common director elements,"
2007 IEEE Antennas and Propagation Society International Symposium, pp.2405-2408, June 2007.

N. Honma, K. Nishimori,Y. Takatori, A. Ohta, S. Kubota,
"Compact and Low-Profile MIMO Terminal Antenna Employing Bidirectional Yagi-Uda Array,"
The 2nd European Conference on Antennas and Propagation (EUCAP 2007), MoPA.045 , Nov. 2007.

T. Yamada, W. Jiang, Y. Takatori, R. Kudo, A. Ohta, S. Kubota,
"Enhanced Simplified Maximum Likelihood Detection (ES-MLD) in Multiuser MIMO Downlink in Time-Variant Environment," Proc. of ISAP2007,pp. 1346-1349, Aug., 2007.

R. Kudo, Y. Takatori, K. Nishimori, A. Ohta and S. Kubota,
"New downlink beamforming method for cooperative multiple access point systems,"
IEICE Trans. on Commun., vol.E90-B, No. 9, pp.2303-2311, Sept., 2007.

R. Kudo, Y. Takatori, K. Nishimori, A. Ohta and S. Kubota,
"User Selection Method for Block Diagonalization in Multiuser MIMO Systems,"
in Proc VTC 2006-Spring Vol. 5, pp. 2216 - 2220, May 2006.

R. Kudo, Y. Takatori, K. Nishimori, A. Ohta and S. Kubota,
"Low Complexity Capacity Estimation Method for Multiuser Block Diagonalization Transmission,"
in Proc., VTC2007-Spring, 22-25, pp. 1836 - 1840, April 2007.

R. Kudo, Y. Takatori, K. Nishimori, A. Ohta and S. Kubota,
"New Simple Capacity Estimation Method for Multiuser Block Diagonalization Transmission,"
in Proc., VTC2007-Spring, 22-25, pp. 1836 - 1840, April 2007.

K. Ishihara, Y. Takatori, and S. Kubota,
"Multiuser detection method for single-carrier transmission in uplink multiuser MIMO access,"
Proc. 66th IEEE VTC-07 Fall, pp. 566-570, Oct. 2007.

K. Ishihara, Y. Takatori, K. Nishimori, and K. Okada,
"Multiuser detection method robust against timing offset for OFDM uplink transmission,"
Proc. 67th IEEE VTC-08 Spring, pp. 1463-1467, May 2008.

K. Ishihara, Y. Takatori, K. Nishimori, and K. Okada,
"Weight estimation and multiuser detection for asynchrous single-carrier multiuser MIMO uplink,"
Proc. 11th International Symposium on Wireless Personal Multimedia Communication (WPMC), Sept. 2008.

"World's Smallest Wireless Transceivers that have full coverage of the 60-GHz band -- High-speed download of gigabyte-class content to mobile or tablet terminals --,"
NTT News Release, http://www.ntt.co.jp/news2012/1201e/120117a.html, January 17, 2012.

M. Kawashima, T. Seki, A. Hirata, and T. Kosugi,
"Millimeter-wave/terahertz circuits and transceivers for broadband wireless systems,"
2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS), Wa1F, Aug. 2011.

K. Nishikawa, M. Kawashima, T. Seki, K. Hiraga,
"Broadband and compact 3-dB MMIC directional coupler with lumped element,"
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International, pp.728-731, May 2010.

T. Seki, K. Hiraga, K. Nishikawa, K. Uehara,
"60-GHz microstrip antenna with stacked rings using multi-layer LTCC substrate,"
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on, pp.3797-3800, March 2009.

T. Seki, N. Honma, K. Nishikawa, and K. Tsunekawa,
"Millimeter-wave High Efficiency Multi-layer Parasitic Microstrip Antenna Array on TEFLON Substrate,"
IEEE Transaction on Microwave Theory and Technique, vol.53, pp.2101-2106, June 2005.

T. Seki, N. Honma, K. Nishikawa, and K. Tsunekawa,
"Novel Microstrip Antenna Employing Stacked Rings on Multi-Layer Ceramic Substrate for mm-Wave Applications,"
IEEE MTT-S 2005 International Microwave Symposium, TH1C-4, June 2005.

K. Nishikawa, B. Piernas, T. Nakagawa, K. Araki, and K. Cho,
"V-band Fully-integrated TX/RX Single-chip 3-D MMICs Using Commercial GaAs pHEMT Technology For High-speed Wireless Applications,"
2003 IEEE GaAs IC Symp. Dig., pp. 97-100, Nov. 2003.

T. Nakagawa, K. Nishikawa, B. Piernas, T. Seki, and K. Araki,
"60-GHz Antenna and 5-GHz Demodulator MMICs for More Than 1-Gbps FSK Transceivers,"
in 32nd European Microwave Conf. Proc., pp. 929-932, 2002.

K. Akabane, H. Shiba, M. Matsui, and K. Uehara,
"Performance Evaluation of an Autonomous Adaptive Base Station that Supports Multiple Wireless Network Systems,"
IEICE Transactions on Communications, vol. E91-B, no. 1, pp. 22-28, Jan. 2008.

M. Kawashima, Y. Yamaguchi, K. Nishikawa, and K. Uehara,
"Broadband Low Noise Amplifier with High Linearity for Software-Defined Radios,"
in Proc. European Microwave Week Conference 2007, pp. 243-246, Oct. 2007.

M. Kawashima, Y. Yamaguchi, K. Kuwabara, N. Sato, K. Machida, and K. Uehara,
"A Dual-Band VCO Integrated with RF-MEMS Switches and Inductors,"
Proc. of European Microwave Conference 2006, pp. 795-798, Sep. 2006.

K. Akabane, H. Shiba, M. Matsui, K. Kobayashi, and K. Araki,
"Design and Performance Evaluation of IEEE 802.11a SDR Software Implemented on a Reconfigurable Processor,"
IEICE Transactions on Communications, vol. E88-B, no. 11, pp. 4163-4169, Nov. 2005.

T. Shono, Y. Shirato, H. Shiba, K. Uehara, K. Araki, and M. Umehira,
"IEEE 802.11 Wireless LAN Implemented on Software Defined Radio with Hybrid Programmable Architecture,"
IEEE Transactions on Wireless Communications, vol. 4, no. 5, pp. 2299-2308, Sep. 2005.

K. Uehara, K. Araki, and M. Umehira,
"Trends in Research and Development of Software Defined Radio,"
NTT Technical Review, Vol. 1, No. 4, pp. 10-14, 2003.

H. Shiba, T. Shono, Y. Shirato, I. Toyoda, K. Uehara, and M. Umehira,
"Software Defined Radio Prototype for PHS and IEEE802.11 Wireless LAN,"
IEICE Transactions on Communications, Vol. E-85-B, No. 12, pp. 2694-2702, Dec. 2002.

M. Kawashima, T. Nakagawa, H. Hayashi, K. Nishikawa, and K. Araki,
"A 0.9-2.6 GHz Broadband RF Front-End Chip-Set with a Direct Conversion Architecture,"
IEICE Transactions on Communications, vol. E-85-B, no. 12, pp. 2732-2740, Dec. 2002.

Y. Suzuki, K. Uehara, M. Nakatsugawa, Y. Shirato, and S. Kubota,
"Software Radio Base and Personal Station Prototypes,"
IEICE Transactions on Communications, vol. E83-B, pp. 1261-1268, June 2000.

K. Akabane, H. Shiba, M. Matsui, K. Kobayashi, and K. Araki,
"Design and Performance Evaluation of IEEE 802.11a SDR Software Implemented on a Reconfigurable Processor,"
IEICE Trans. Commun., vol. E88-B, no. 11, pp. 4163-4169, Nov. 2005.

M. Kawashima, T. Nakagawa, Y. Yamaguchi, and K. Araki,
"Improved technique for reflection performances in broadband variable gain low noise amplifiers,"
13th Gallium Arsenide and other Compound Semiconductors Application Symp., pp. 81-84, Oct.
2005.

T. Shono, Y. Shirato, H. Shiba, K. Uehara, K. Araki, and M. Umehira,
"IEEE 802.11 Wireless LAN Implemented on Software Defined Radio with Hybrid Programmable Architecture,"
IEEE Trans. on Wireless Communications, vol. 4, no. 5, pp. 2299-2308, Sep. 2005.

T. Seki, N. Honma, K. Nishikawa, and Kouichi Tsunekawa,
"Millimeter-wave High Efficiency Multi-layer Parasitic Microstrip Antenna Array on TEFLON Substrate,"
IEEE Transaction on Microwave Theory and Technique, vol.53, no.7, pp. 2101-2106, July 2005.

N. Honma, T. Seki, K. Nishikawa, K. Tsunekawa, and K. Sawaya,
"Series-Fed Beam-Scanning Antenna Employing Multi-Stage Configured Microstrip Antennas with Tunable Reactance Devices,"
IEICE Trans. Commun. vol.E88-B, no.6, pp.2297-2304, June 2005.

Bin Zhen, Kobayashi Mamoru, Shimizu Masashi,
"The reading of transmitter-only RFID tags,"
ACTA, International Journal of Computers and Applications, Vol.27, No.1, pp.10-19, Jan. 2005.

F. Nuno, I. Toyoda, and M. Umehira,
"Performance evaluation of QoS control scheme that uses back pressure traffic control,"
The 15th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2004 (PIMRC 2004), vol.2, 5-8, pp.830-834, Sep. 2004.

S. Kurosaki, Y. Asai, T. Sugiyama, and M. Umehira,
"A SDM-COFDM Scheme Employing a Simple Feed-Forward Inter-Channel Interference Canceller for MIMO Based Broadband Wireless LANs,"
IEICE Trans. Commun, vol.E86-B, no.1, Jan. 2003.

M. Kawashima, T. Nakagawa, H. Hayashi, K. Nishikawa, and K. Araki,
"A 0.9-2.6 GHz Broadband RF Front-End Chip-Set with a Direct Conversion Architecture,"
IEICE Trans. Commun., vol.E85-B, no.12, pp.2732-2740, Dec. 2002.

●Photonic Transport Network Laboratory

[Papers]

Hiroshi masuda, Masahito tomizawa, Yutaka Miyamoto and Kazuo hagimoto,
"High-performace distributed Raman amplification systems with limited pump power",
IEICE Trans. Commun., Vol.E89-B, No.3, Mar. 2006.

T. Inui, K. Mori, T. Ohara, H. Takara, T. Komukai, T. Morioka,
"160 Gbit/s adaptive dispersion equaliser using asynchronous chirp monitor with balanced dispersion configuration,"
Electron. Lett., vol.40, pp.256-257, 2004.

A. Watanabe, K. Noguchi, K. Shimano, T. Kawai, E. Yoshida, A. Sahara, T. Takahashi, S. Okamoto, T. Goh, Y. Takigawa, M. Koga, K. Sato,
"Photonic MPLS Router to Create Bandwidth-Abundant IP Networks,"
IEEE Journal of Lightwave Technology Special Issue on "Optical@Networks", Vol.21, Issue 11, pp.2851-2862, Nov. 2003.

K. Shimano, A. Sahara, K. Noguchi, T. Takahashi, M. Koga, Y. Takigawa, K. Sato,
"Fast Restoration on Network Control Plane Established Through Photonic MPLS Router,"
IEICE Trans. Communication Vol.E86-B, No.5, pp.1522-1529, May 2003.

S. Kuwahara, A. Hirano, H. Masuda, H. Kawakami, Y. Miyamoto, M. Yoneyama, Y.Kisaka, K. Sato, M. Tomizawa, Y. Tada, T. Sawabe, T. Fujii,
"WDM field demostration of 43 Gbit/s/channel path provisioning by automatic dispersion compensation using tone modulated CS-RZ signal,"
ECOC2003, paper Tu1.6.2. 2003.

J. Yamawaku, H. Takara, T. Ohara, K. Sato, A. Takada, T. Morioka, O. Tadanaga, H. Miyazawa, M. Asobe,
"Simultaneous 25 GHz-spaced DWDM wavelength conversion of 1.03 Tbit/s (103/spl times/10 Gbit/s) signals in PPLN waveguide,"
Electron. Lett., vol.39, pp.1144-1145, 2003.

T. Yamamoto, H. Takara, and S. Kawanishi,
"270-360 GHz tunable beat signal light generator for photonic local oscillator,"
Electron. Lett., vol.38, No.15, pp.795-797, 2002.

K. Suzuki, H. Kubota, S. Kawanishi, and M. Fujita
"High-speed bi-directional polarization division multiplexed optical transmission in ultra low-loss (1.3 dB/km) polarization maintaining photonic crystal Fibre,"
IEE Electronics Letters, vol.37, No.23, pp.1399-1401, 2001.

H. Takara, T. Ohara, K. Mori, K. Sato, E. Yamada, Y. Inoue, T. Shibata, M. Abe, T. Morioka, K.-I. Sato,
"More than 1000 channel optical frequency chain generation from single supercontinuum source with 12.5 GHz channel spacing,"
Electron. Lett., vol.36, pp.2089-2090, 2000.

Yutaka Miyamoto, Akiro Hirano, Kazushige Yonenaga, Akihide Sano, Hiromu Toba, Koichi Murata, and Osamu Mitomi,
"320-Gbit/s (8 x 40 Gbit/s) WDM transmission over 367-km with 120-km repeater spacing using carrier-suppressed return-to-zero format,"
Electron. Lett. vol.35, No.23 pp.2041-2042, Nov. 1999.

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