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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 28  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
RCS 2013-04-19
13:00
Okinawa Ishigaki City Hall A Transmission Power Control Method by Interference Power Estimation in Shared Frequency Bands
Atsushi Ikeda, Shigeru Tomisato (Okayama Univ.), Hiromasa Fujii (NTTDOCOMO), Masaharu Hata (Okayama Univ.) RCS2013-19
This paper evaluates interference power reduction effect with the proposed transmission power control (TPC) method for l... [more] RCS2013-19
pp.101-106
SR 2013-01-25
10:20
Nagano Shinshu Univ. An interference power estimation method for low-priority systems in spectrum sharing systems
Atsushi Ikeda, Shigeru Tomisato (Okayama Univ.), Hiromasa Fujii (NTTDOCOMO), Masaharu Hata (Okayama Univ.) SR2012-77
This paper proposes a new transmission power control method for low-priority systems by the accurate estimation of inter... [more] SR2012-77
pp.33-38
SAT, RCS
(Joint)
2012-08-30
11:30
Kochi Kochi City Cultura-Plaza CUL-PORT Transmission Performance Improvement by Non-Linear Distortion Noise Control in Spectrum Sharing
Seiichiro Okamoto, Shigeru Tomisato (Okayama Univ.), Hiromasa Fujii (NTTDOCOMO), Masaharu Hata (Okayama Univ.), Shunji Miura, Hidetoshi Kayama (NTTDOCOMO) RCS2012-101
On spectrum sharing systems, transmission power control (TPC) effectively works to avoid harmful inter-system interferen... [more] RCS2012-101
pp.31-36
SR 2012-07-26
13:25
Kagoshima Yakushima (an island in Kagoshima pref.) A Proposed Application of Cognitive Radio Technique towards the Usage of White Space in Public Cellular Systems and its Evaluation Results obtained form an Indoor Test-Bed
Hiromasa Fujii, Shunji Miura, Hidetoshi Kayama (NTT DOCOMO) SR2012-18
 [more] SR2012-18
pp.7-14
SR 2012-01-26
16:05
Kagoshima Kagoshima [Panel Discussion] Possible applications of cognitive radio techniques to the next generation cellular communication systems
Hiromasa Fujii, Hiroki Harada, Shunji Miura, Hidetoshi Kayama (NTT DOCOMO) SR2011-84
 [more] SR2011-84
pp.43-50
NS, RCS
(Joint)
2011-12-16
15:05
Yamaguchi Yamaguchi University Non-Linear Distortion Noise Control for Spectrum Sharing Systems
Seiichiro Okamoto, Shigeru Tomisato (Okayama Univ.), Hiromasa Fujii (NTTDOCOMO), Masaharu Hata (Okayama Univ.), Shunji Miura, Hidetoshi Kayama (NTTDOCOMO) RCS2011-260
Recently, a spectrum sharing method between wireless communication systems has been studied to use frequency resources w... [more] RCS2011-260
pp.165-170
SR 2011-04-22
09:55
Shimane Matsue Terrsa Achievable Capacity of Cognitive Radio Systems Coexisting with a Macro Cellular System
Hiromasa Fujii, Hiroki Harada, Shunji Miura, Hidetoshi Kayama (NTT DOCOMO) SR2011-9
 [more] SR2011-9
pp.53-58
SR 2011-04-22
10:20
Shimane Matsue Terrsa A Study on Spectrum Sharing between Systems Using 3D Area Model -- Improvement of Evaluation Method and Comparison with a Method Based on 2DArea Model --
Hiroto Yasuda, Hiromasa Fujii, Shunji Miura, Hidetoshi Kayama (NTT DOCOMO) SR2011-10
In this paper, we propose a simulation method for system level evaluation based on 3-dimensional area model when an macr... [more] SR2011-10
pp.59-64
RCS, MoNA, SR
(Joint)
2011-03-02
13:40
Kanagawa YRP A Signal Recognition Technique based on Cyclostationarity and its Application to Cognitive Radio Systems
Hiroki Harada, Hiromasa Fujii, Shunji Miura, Hidetoshi Kayama (NTT DOCOMO) SR2010-90
This paper introduces a signal recognition technique based on cyclostationarity and proposes its application to cognitiv... [more] SR2010-90
pp.17-22
SR 2011-01-27
13:25
Fukuoka Kyushu Institute of Technology Experimental Evaluation of Cyclostationarity-Based Multiple Signal Identification Method by using Spatial Channel Emulator
Hiroki Harada, Hiromasa Fujii, Shunji Miura, Hidetoshi Kayama, Yoshiki Okano, Tetsuro Imai (NTT DOCOMO) SR2010-70
The problem with conventional cyclostationarity-based feature detection
is that the detection probability of weak sign... [more]
SR2010-70
pp.7-12
NS, RCS
(Joint)
2010-12-17
16:10
Okayama Okayama Univ. Interference Properties of OFDMA Systems under Spectrum Sharing Environment
Yuichiro Fukuda, Shigeru Tomisato (Okayama Univ.), Hiromasa Fujii (NTT DOCOMO), Masaharu Hata (Okayama Univ.), Shunji Miura (NTT DOCOMO) RCS2010-198
This paper evaluates interference reduction effects by transmission power control (TPC) under spectrum sharing environme... [more] RCS2010-198
pp.233-238
AN, USN, SR, RCS
(Joint)
2010-10-29
12:00
Osaka Osaka University Achievable Capacity of Cognitive Radio Systems Coexisting with a Macro Cellular System
Hiromasa Fujii, Shunji Miura, Tomoyuki Ohya (NTT DOCOMO) SR2010-68
 [more] SR2010-68
pp.199-204
SR 2010-07-29
13:00
Kyoto ATR (Kyoto) Experimental Evaluation of Multiple Signal Identification based on Cyclostationarity in Spectrum Sharing Scenarios
Hiroki Harada, Hiromasa Fujii, Shunji Miura, Tomoyuki Ohya (NTT DOCOMO) SR2010-16
The problem of conventional cyclostationarity-based feature detection is that the detection probability of weak signals ... [more] SR2010-16
pp.1-6
RCS, AN, MoNA, SR
(Joint)
2010-03-04
11:50
Kanagawa YRP Extensions of Linear Constraint Adaptive Array and Zero Forcing for Spectrum Sharing Environments
Hiromasa Fujii, Takahiro Asai, Tomoyuki Ohya (NTT DOCOMO) RCS2009-292
 [more] RCS2009-292
pp.197-202
SR 2010-01-22
10:40
Tokyo Univ. of Electro-Communications Iterative Cyclostationarity-based Feature Detection of Multiple Primary Signals for Spectrum Sharing Scenarios
Hiroki Harada, Hiromasa Fujii, Shunji Miura, Tatsuo Furuno, Tomoyuki Ohya (NTT DOCOMO, INC.) SR2009-84
The original cyclostationarity cannot distinguish signals if several signals have the same signal format and parameters,... [more] SR2009-84
pp.65-72
RCS, SIP 2010-01-21
16:00
Fukuoka Kyushu Univ. Optimum Weighting for Adaptive Array Antennas under Spectrum Sharing Environments
Hiromasa Fujii, Takahiro Asai, Tomoyuki Ohya (NTT DOCOMO) SIP2009-98 RCS2009-232
 [more] SIP2009-98 RCS2009-232
pp.145-150
RCS, SAT
(Joint)
2009-12-18
14:50
Tokyo Kikai-Shinko-Kaikan Bldg. Spectrum Properties of DFTS-OFDM Transmission with Nonlinear Distortion
Yuichiro Fukuda, Shigeru Tomisato, Masaharu Hata (Okayama Univ.), Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura (NTTDOCOMO) RCS2009-195
This paper evaluates spectrum property of DFTS-OFDM transmission with non-linear distortion of a transmission power ampl... [more] RCS2009-195
pp.167-172
SR, AN, USN
(Joint)
2009-10-22
10:00
Miyagi Tohoku Univ. AM-PM Characteristics of Low Noise Block Converters
Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura (NTT DOCOMO), Ryoko Kawauchi, Ikuo Hiradate, Hayato Akazawa, Takayuki Sotoyama (Panasonic Mobile Communications) SR2009-52
 [more] SR2009-52
pp.7-12
SR, AN, USN
(Joint)
2009-10-22
10:20
Miyagi Tohoku Univ. Capacity Achievable by Spectrum Sharing with Adaptive Transmit Power Control: Based on Field Measurements
Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura (NTT DOCOMO,), Ryoko Kawauchi, Ikuo Hiradate, Hayato Akazawa, Takayuki Sotoyama (Panasonic Mobile Communications) SR2009-53
 [more] SR2009-53
pp.13-19
RCS 2009-06-25
13:40
Aichi Nagoya University Out-of-band distortion power reduction by soft-clipping for wireless OFDMA systems
Toshihisa Fujiwara, Shigeru Tomisato, Masaharu Hata (Okayama Univ.), Hiromasa Fujii, Takahiro Asai, Yukihiko Okumura (NTTDOCOMO) RCS2009-29
This paper proposes an adaptive control method for soft clipping which is one of effective peak power reduction methods ... [more] RCS2009-29
pp.13-16
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