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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 23  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
AP 2016-05-20
15:40
Hyogo kobe Univ. Simulation Evaluation of Cell Quality by Beam Control on Active Array Antenna System
Masayuki Nakano, Toru Kitayabu (KDDI R&D Labs.), Keisuke Sato, Ichiro Oshima (DKK) AP2016-30
Active array antenna system (AAS) is considered as the base station of the next generation. In order to reduce the inter... [more] AP2016-30
pp.77-82
AP 2016-02-19
14:45
Fukushima Iwaki (Spa Resort Hawaiians) Propagation Characteristics Analysis of Orthogonal Polarized MIMO in Street Cell Model
Daichi Matsuoka, Hiroyasu Ishikawa (Nihon Univ.), Toru Kitayabu, Masayuki Nakano (KDDI R&D Labs.) AP2015-202
In this research, analysis and comparison of computer simulation results and field experimental results for orthogonal p... [more] AP2015-202
pp.65-70
AP, RCS, WPT, SAT
(Joint)
2015-11-04
15:55
Okinawa Okinawa Prefectural Museum & Art Museum [Invited Lecture] Path Loss Characteristics of Wideband Channels at 4.5 GHz
Toru Kitayabu, Lin Ho-Yu, Masayuki Nakano (KDDI Labs.) AP2015-122 RCS2015-204
 [more] AP2015-122 RCS2015-204
pp.71-76(AP), pp.85-90(RCS)
MW, AP
(Joint)
2015-09-18
12:45
Tochigi Oyama National College of Tech. Field Evaluation of Cell Quality by Beam Control with Active Array Antenna System
Masayuki Nakano, Toru Kitayabu (KDDI R&D Labs.), Shohei Natori, Keisuke Sato, Ichiro Oshima (DKK), Koji Miyata, Hisahiro Hayashi, Kazuhiro Gosui (KDDI) AP2015-90
Active array antenna system (AAS) is considered as the base station of the next generation. In order to reduce the inter... [more] AP2015-90
pp.59-64
AP, SANE
(Joint)
2015-08-27
14:35
Ibaraki Ibaragi Univ. Mito Campus Active Array Antenna System for Cellular Base Station
Keisuke Sato, Shohei Natori, Ichiro Oshima (Denkikogyo), Toru Kitayabu, Masayuki Nakano (KDDI Lab.), Kouji Miyata, Hisahiro Hayashi, Kazuhiro Gosui (KDDI) AP2015-65
In 5th generation mobile networks, the introduction of active array antenna system (AAS) is considered for energy effici... [more] AP2015-65
pp.25-30
AP, RCS
(Joint)
2014-11-13
14:40
Yamagata Yamagata University, Yonezawa Campus Restoring Directivity of Active array Antenna System in the case of Antenna Element Failure
Yukitaka Takahashi, Shohei Natori, Keisuke Sato, Ichiro Oshima (Denki Kogyo), Toru Kitayabu, Masayuki Nakano (KDDI R&D LABS) AP2014-143
Active array Antenna System (AAS) is expected for base station antenna of mobile communication system. AAS has the phase... [more] AP2014-143
pp.81-86
AP, RCS
(Joint)
2014-11-14
09:30
Yamagata Yamagata University, Yonezawa Campus Propagation Characteristics Analysis of Orthogonal Linearly Polarized MIMO in Street Cell Model
Hirofumi Saito, Fumiya Ohba, Hiroyasu Ishikawa (Nihon Univ.), Toru Kitayabu, Masayuki Nakano (KDDI R&D Labs.) AP2014-146
Orthogonal linearly polarized antenna combined with MIMO technology has been researched and applied to mobile communicat... [more] AP2014-146
pp.97-102
AP, RCS
(Joint)
2014-11-14
09:55
Yamagata Yamagata University, Yonezawa Campus Propagation Analysis of Orthogonal Circularly Polarized MIMO in Street Cell Model
Fumiya Ohba, Hirofumi Saito, Hiroyasu Ishikawa (Nihon Univ.), Toru Kitayabu, Masayuki Nakano (KDDI R&D Labs.) AP2014-147
Circular polarization is one of the polarization methods of radio waves that rotate the polarized wave proceeding with t... [more] AP2014-147
pp.103-108
AP, WPT
(Joint)
2014-10-16
12:55
Hokkaido Hokkaido University, Clark Memorial Student Center Frequency Characteristics of Path Loss in Street Cell Environment
Toru Kitayabu, Hiromi Matsuno, Yoshiaki Amano, Masayuki Nakano, Akira Yamaguchi (KDDI Labs.) AP2014-116
In this paper, path losses are measured in 3.5 GHz, 870 MHz and 2115 MHz, respectively. The measurement results are comp... [more] AP2014-116
pp.43-47
AP, WPT
(Joint)
2014-10-17
13:55
Hokkaido Hokkaido University, Clark Memorial Student Center Experimental Investigation of Glass Loss for Indoor-to-outdoor Propagation
Hiromi Matsuno, Toru Kitayabu, Yoshiaki Amano, Masayuki Nakano, Akira Yamaguchi (KDDI R&D Labs) AP2014-125
In this paper, the experimental evaluation of indoor-to-outdoor propagation in 3.5GHz, 2.115GHz, and 870MHz is employed.... [more] AP2014-125
pp.93-97
AP, WPT
(Joint)
2014-10-17
14:20
Hokkaido Hokkaido University, Clark Memorial Student Center Field Experiments on MIMO Antennas for Small Cell Base Stations in 3.5GHz Band
Yoshiaki Amano, Toru Kitayabu, Hiromi Matsuno, Masayuki Nakano, Akira Yamaguchi (KDDI R&D) AP2014-126
Small cells have attracted a lot of attention to improve data throughput and frequency utilization efficiency for the 4t... [more] AP2014-126
pp.99-103
MICT, WBS 2014-07-29
12:30
Osaka Osaka City Univ. (Umeda Satellite) [Poster Presentation] Evaluation on Propagation Characteristics of Circularly Polarized MIMO in Street Cell Simple Model
Fumiya Ohba, Hiroyasu Ishikawa (Nihon Univ.), Toru Kitayabu, Masayuki Nakano (KDDI R&D Labs.) WBS2014-17 MICT2014-31
Circular polarization is one of the polarization methods of radio waves that rotate the polarized wave proceeding with t... [more] WBS2014-17 MICT2014-31
pp.45-50
AP 2014-03-11
13:35
Fukushima Koriyama City Rodo Fukushi Kaikan Evaluation on Propagation Characteristics of Circularly Polarized MIMO in Street Cell Model
Fumiya Ohba, Hiroyasu Ishikawa (Nihon Univ.), Toru Kitayabu, Masayuki Nakano (KDDI R&D Labs.) AP2013-197
Circular polarization is one of the transmission techniques that rotates the polarized wave proceeding with time. The ci... [more] AP2013-197
pp.69-74
AP 2014-02-07
10:00
Aichi Kojima Industries Corporation, Kojima Research Center [Invited Lecture] Study of Measurement Method of Transmitter Characteristecs of Active Array Antenna for Cellular Base Station
Yukitaka Takahashi, Shohei Natori, Keisuke Sato, Ichiro Oshima (DKK), Toru Kitayabu, Masayuki Nakano (KDDI Lab.) AP2013-177
Active array Antenna System (AAS) is expected for base station antenna of next generation mobile communication system (I... [more] AP2013-177
pp.63-68
AP 2014-01-22
14:25
Kagoshima Hozan Hall (Kagoshima Prefectural Culture Center) Dual Frequency and Polarized Self-Diplexing Antenna
Keisuke Sato, Ichiro Oshima (Denki Kogyo), Toru Kitayabu, Masayuki Nakano (KDDI Labs.) AP2013-141
Currently, multi-frequency band and dual-polarized antennas are often used as a base station antenna in mobile communica... [more] AP2013-141
pp.43-48
RCS 2013-04-18
15:15
Okinawa Ishigaki City Hall JT-CoMP performance evaluation in different cell densities
Takahiro Hayashi, Toru Kitayabu, Shinobu Nanba (KDDI R&D Labs) RCS2013-10
 [more] RCS2013-10
pp.55-59
AP
(2nd)
2012-12-21
15:00
Okinawa KDDI Naha Building 6F Study of Measurement Method of Transmitter Characteristics of Active Array Antenna for Cellular Base Station
Yukitaka Takahashi, Keisuke Sato, Ichiro Oshima (Denkikogyo), Yoshiaki Amano, Toru Kitayabu, Masayuki Nakano (KDDI Lab.)
 [more]
RCS 2011-06-23
11:10
Okinawa Ryukyu Univ. A Study of Cross-Carrier Precoding for Carrier Aggregation System
Yuji Ikeda, Issei Kanno, Toru Kitayabu, Hiroyasu Ishikawa (KDDI Lab.) RCS2011-41
 [more] RCS2011-41
pp.37-42
SR 2010-07-30
13:20
Kyoto ATR (Kyoto) [Technology Exhibit] Development of Muiti-mode SDR Terminal with Energy Efficient Radio Access Network Selection Algorithm
Yuji Ikeda, Kosuke Yamazaki, Toru Kitayabu, Issei Kanno, Hiroyasu Ishikawa (KDDI Lab) SR2010-39
 [more] SR2010-39
pp.133-136
RCS, SAT
(Joint)
2009-12-18
15:30
Tokyo Kikai-Shinko-Kaikan Bldg. A Study on Quantization Noise Reduction of Delta-Sigma Modulator with Nonuniform Quantization
Mao Hagiwara (Chuo Univ.), Toru Kitayabu, Hiroyasu Ishikawa (KDDI R&D Labs.), Hiroshi Shirai (Chuo Univ.) RCS2009-197
In this paper, a novel delta-sigma modulator which has a non-uniform quantizer is proposed. A delta-sigma modulator is u... [more] RCS2009-197
pp.179-184
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