白井研究室の研究業績
2012年度(平成24年度)
白井研究室で行われた研究のうち，論文等の形で学術論文誌等に公表されたものを紹介します.
- 論文 等
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2012. 4: Ryoichi Sato, Hiroshi Sato, and Hiroshi Shirai,
"Novel usage of binary tree in SBR algorithm for efficient indoor propagation analysis,"
IEICE Electron. Express, Vol. 9, No. 7, pp.673-678, 2012.
[Abstract]:
This letter proposes new usage of the binary tree constructed by fundamental GO ray components
in shooting and bouncing rays (SBR) for indoor propagation analysis.
The node number of the binary tree is here considered as an important parameter.
A couple of small size arrays that can store the passing ray information of both the node number
and the position of the pixel considered,
and the corresponding ray classification algorithm are newly introduced,
not to double-count the same ray with slightly different bouncing angle.
Consequently, we realize the big reduction of the computer memory resources
consumed for the ray classification especially for wide area analysis,
keeping the high accuracy of the SBR method.
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2012. 7: Toru Kitayabu, Mao Hagiwara, Hiroyasu Ishikawa, and Hiroshi Shirai,
"A delta-sigma modulator using a non-uniform quantizer adjusted for the probability density
of input signals,"
IEICE Trans. Communcation, Vol.E95-B, No. 7, pp. 2257-2265, 2012.
[Abstract]:
A novel delta-sigma modulator that employs a non-uniform quantizer whose spacing is
adjusted by reference to the statistical properties of the input signal is proposed.
The proposed delta-sigma modulator has less quantization noise compared to the one
that uses a uniform quantizer with the same number of output values.
With respect to the quantizer on its own, Lloyd proposed a non-uniform quantizer
that is best for minimizing the average quantization noise power.
The applicable condition of the method is that the statistical properties of the input signal,
the probability density, are given.
However, the procedure cannot be directly applied to the quantizer in the delta-sigma modulator
because it jeopardizes the modulator's stability.
In this paper, a procedure is proposed that determine
the spacing of the quantizer.
Simulation results show that the proposed method reduces quantization noise by up to 3.8 dB and 2.8 dB
with the input signal having a PAPR of 16 dB and 12 dB, respectively,
compared to the one employing a uniform quantizer.
Two alternative types of probability density function (PDF) are used in the proposed method
for the calculation of the output values.
One is the PDF of the input signal to the delta-sigma modulator and the other is an approximated PDF
of the input signal to the quantizer inside the delta-sigma modulator.
Both approaches are evaluated to find that the latter gives lower quantization noise.
- 国際会議発表 等
- 2012. 7;
R. Sato, H. Shirai and Y. Abe,
``GTD analysis for diffraction by a thin slit on infinitely long PEC screen,"
Proc. of 2012 IEEE International Symposium on Antennas and Propagation, Chicago, IL USA.
- 2012. 8;
Y. Abe, H. Shirai and R. Sato,
``High frequency asymptotic analysis of modal excitation at flanged parallel plane waveguides,"
Proc. of 2012 International Conference on Communications and Electronics (ICCE),
CDROM, Hue, Vietnam.
- 2012. 9;
H. Shirai and Y. Hiramatsu
``Reconstruction of cylinderical metal targets using their monostatic RCS,"
Proc. of 2012 International Conference on Electromagnetics in Advanced Applications (ICEAA),
CDROM, Capetown, South Africa.
- 学会, 研究会発表 等
- 2012.9;
白井 宏，``光線近似を用いた電波伝搬の広域推定について,''
2012年 電子情報通信学会 ソサイエティ大会 講演論文集，BP-1-2, CDROM．
- 2012.9;
佐藤 亮一，白井 宏，阿部 祐志,
``無限長導体スクリーン上の2つのスリットによる平面電磁波回折の光線−モード結合解析,''
2012年 電子情報通信学会 ソサイエティ大会 講演論文集，SC-1-6, CDROM．
- 2012.11;
前田 崇秀，白井 宏，
"回折波をSBR法に組み込むためのアルゴリズムの提案,"
電気学会電磁界理論研究会 研究会資料, EMT--12--137, pp.95--100.
- 2012.11;
細田 大輝，白井 宏，佐藤 亮一，
"SBR法を用いた３次元空間の伝搬推定,"
電気学会電磁界理論研究会 研究会資料, EMT--12--138, pp.101--106.
- 2012.11;
阿部 祐志，白井 宏，佐藤 亮一，
"フランジ付導波管開口における導波管モードの高周波近似解析,"
電気学会電磁界理論研究会 研究会資料, EMT--12--150, pp.173--178.
- 2013.3;
ヌエン ヌゴック アン, 白井 宏，``誘電体境界からの高周波散乱界,''
2013年 電子情報通信学会 全国大会 講演論文集，CDROM．
- 2013.3;
藤田 佳祐, 白井 宏，``電気的小型アンテナにおける損失電力について,''
2013年 電子情報通信学会 全国大会 講演論文集，CDROM．
- 修士論文
- 2013.3.24; 阿部 祐志,
``厚みのある導体スリットによるＨ偏波の平面波回折,"
修士論文，中央大学 理工学研究科．
- 2013.3.24; 細田 大輝,
``SBR法による屋内外電磁波伝搬解析,"
修士論文，中央大学 理工学研究科．
- 2013.3.24; 洞内 俊行,
``FDTD法を用いた遠方散乱界の導出について,"
修士論文，中央大学 理工学研究科．
- 卒業論文
- 2013.3.24; 林 純也,
``曲面と凹面を含む柱状散乱体の電磁波散乱解析,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 木村 瞬, 石橋 龍博,
``RFIDを用いた出欠席データ管理システムに関する研究,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 松本 健志,
``RapLabを用いた電磁波伝搬解析とSBR法との比較,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 鈴木 裕美,
``FDTD法を用いた平面波入射による電磁波伝搬解析,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 玉田 直貴,
``ハンディサーチによるアルミ板の位置推定の研究,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 若佐 充, 中家 朋彦,
``凹面を含む散乱体の順散乱解析に関する研究,"
卒業論文，中央大学 理工学部 電気電子情報通信工学科．
- 2013.3.24; 倉邊 朋弥,
``凹曲面を含む柱状散乱体の散乱解析,"
- その他