IEICE Trans

Koichi ICHIGE

ECG Signal Reconstruction Using FMCW Radar and a Convolutional Neural Network for Contactless Vital-Sign Sensing Daiki TODA Ren ANZAI Koichi ICHIGE Ryo SAITO Daichi UEKI
Publication: Publication Date: 2023/01/01 Vol. E106-B No. 1 pp. 65-73 Type of Manuscript: PAPER Category: Sensing Keyword: frequency-modulated continuous-wave radar, convolutional neural network, electrocardiogram, heartbeat,
	Summary \| Full Text:PDF(2.2MB)

Accurate Source-Number Estimation Using Denoising Preprocessing and Singular Value Decomposition Shohei HAMADA Koichi ICHIGE Katsuhisa KASHIWAGI Nobuya ARAKAWA Ryo SAITO
Publication: Publication Date: 2022/06/01 Vol. E105-B No. 6 pp. 766-774 Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2020) Category: DOA Estimation Keyword: source-number estimation, direction of arrival estimation, array signal processing, annihilating filter, FMCW-MIMO radar,
	Summary \| Full Text:PDF(2.4MB)

Optimization and Hole Interpolation of 2-D Sparse Arrays for Accurate Direction-of-Arrival Estimation Shogo NAKAMURA Sho IWAZAKI Koichi ICHIGE
Publication: Publication Date: 2021/04/01 Vol. E104-B No. 4 pp. 401-409 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: direction of arrival estimation, array signal processing, sparse array, mutual coupling, nuclear norm minimization,
	Summary \| Full Text:PDF(1.5MB)

Single Image Haze Removal Using Iterative Ambient Light Estimation with Region Segmentation Yuji ARAKI Kentaro MITA Koichi ICHIGE
Publication: Publication Date: 2021/02/01 Vol. E104-A No. 2 pp. 550-562 Type of Manuscript: PAPER Category: Image Keyword: haze removal, dark channel, HSV color space, region segmentation,
	Summary \| Full Text:PDF(29.3MB)

DOA-Based Weighted Spatial Filter Design for Sum and Difference Composite Co-Array Sho IWAZAKI Shogo NAKAMURA Koichi ICHIGE
Publication: Publication Date: 2020/10/01 Vol. E103-B No. 10 pp. 1147-1154 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: array antenna, adaptive beamforming, direction of arrival estimation,
	Summary \| Full Text:PDF(1.4MB)

Extended Beamforming by Sum and Difference Composite Co-Array for Real-Valued Signals Sho IWAZAKI Koichi ICHIGE
Publication: Publication Date: 2019/07/01 Vol. E102-A No. 7 pp. 918-925 Type of Manuscript: PAPER Category: Digital Signal Processing Keyword: adaptive beamforming, extended array signal processing, correlation matrix,
	Summary \| Full Text:PDF(1012.7KB)

Phase-Difference Compensation and Nonuniform Pulse Transmission for Accurate Real-Time Moving Object Tracking Koichi ICHIGE Nobuya ARAKAWA Ryo SAITO Osamu SHIBATA
Publication: Publication Date: 2019/01/01 Vol. E102-A No. 1 pp. 211-218 Type of Manuscript: PAPER Category: Digital Signal Processing Keyword: location estimation, tracking, Kalman filter,
	Summary \| Full Text:PDF(1.3MB)

Nested Circular Array and Its Concentric Extension for Underdetermined Direction of Arrival Estimation Thomas BASIKOLO Koichi ICHIGE Hiroyuki ARAI
Publication: Publication Date: 2018/04/01 Vol. E101-B No. 4 pp. 1076-1084 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: array antenna, degrees of freedom (DOF), direction of arrival estimation, Khatri-Rao product, nested array,
	Summary \| Full Text:PDF(1.4MB)

Array Correlation Matrix Element Properties and Their Application to Low-Cost DOA Estimation Koichi ICHIGE Yu IWABUCHI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2016/08/01 Vol. E99-B No. 8 pp. 1859-1866 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: direction of arrival estimation, array signal processing, correlation matrix,
	Summary \| Full Text:PDF(573.4KB)

High Resolution 2-D DOA Estimation by Low-Cost Antenna Array Based on Synthesized Covariance Matrix via Antenna Switching Yuki DOI Hiroki MORIYA Koichi ICHIGE Hiroyuki ARAI Takahiro HAYASHI Hiromi MATSUNO Masayuki NAKANO
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2013/10/01 Vol. E96-A No. 10 pp. 1962-1971 Type of Manuscript: Special Section PAPER (Special Section on Sparsity-aware Signal Processing) Category: Keyword: direction of arrival estimation, array signal processing, sensor array, antenna array,
	Summary \| Full Text:PDF(2.9MB)

Improving Elevation Estimation Accuracy in DOA Estimation: How Planar Arrays Can Be Modified into 3-D Configuration Hiroki MORIYA Koichi ICHIGE Hiroyuki ARAI Takahiro HAYASHI Hiromi MATSUNO Masayuki NAKANO
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2012/10/01 Vol. E95-A No. 10 pp. 1667-1675 Type of Manuscript: Special Section PAPER (Special Section on Advances in Adaptive Signal Processing and Applications) Category: DOA Keyword: direction of arrival estimation, array signal processing, sensor arrays, antenna arrays,
	Summary \| Full Text:PDF(1.5MB)

Automated Microwave Filter Tuning Based on Successive Optimization of Phase and Amplitude Characteristics Yosuke TAKEUCHI Koichi ICHIGE Koichi MIYAMOTO Yoshio EBINE
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2011/02/01 Vol. E94-A No. 2 pp. 617-624 Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics) Category: Keyword: microwave filter, bandpass filter, tuning, optimization,
	Summary \| Full Text:PDF(1.2MB)

Efficient Heterodyne Digital Receiver with Direct RF-to-Digital Conversion for Software Defined Radio Minseok KIM Takayuki MOTEKI Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2009/04/01 Vol. E92-A No. 4 pp. 1056-1062 Type of Manuscript: Special Section PAPER (Special Section on Advanced Technologies Emerging Mainly from the 21st Workshop on Circuits and Systems in Karuizawa) Category: Keyword: multimode, RF to digital conversion, sampling, software defined radio, cognitive radio,
	Summary \| Full Text:PDF(867.7KB)

High Resolution DOA Estimation Using Unwrapped Phase Information of MUSIC-Based Noise Subspace Koichi ICHIGE Kazuhiko SAITO Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2008/08/01 Vol. E91-A No. 8 pp. 1990-1999 Type of Manuscript: Special Section PAPER (Special Section on Signal Processing) Category: Keyword: direction of arrival estimation, array antenna, MUSIC method, phase characteristics,
	Summary \| Full Text:PDF(581.4KB)

High Resolution DOA Estimation Using Second-Order Differential of MUSIC Spectrum Koichi ICHIGE Yoshihisa ISHIKAWA Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/03/01 Vol. E90-A No. 3 pp. 546-552 Type of Manuscript: Special Section PAPER (Special Section on Multimedia and Mobile Signal Processing) Category: Communications Keyword: direction of arrival estimation, array antenna, MUSIC method, Root-MUSIC method,
	Summary \| Full Text:PDF(572.7KB)

Filter Effect on Low-IF Multichannel Receiver: How a Simple Filter Improves Digital Communication Quality Nozomi ZAMA Koichi ICHIGE
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3471-3474 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: low-IF receiver, cosine rolloff filter, digital modulation, software defined radio,
	Summary \| Full Text:PDF(272.3KB)

Accurate Source Number Detection Using Pre-Estimated Signal Subspace Yoshihisa ISHIKAWA Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3257-3265 Type of Manuscript: Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications) Category: Keyword: source number detection, array antenna, AIC, MDL, MUSIC method, beamformer method,
	Summary \| Full Text:PDF(514.4KB)

An Efficient Signed-Power-of-Two Term Allocation for Filter Coefficients in Digital Communication System Koichi ICHIGE Hideaki MUNEMASA Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3266-3268 Type of Manuscript: Special Section LETTER (Special Section on Software Defined Radio Technology and Its Applications) Category: Keyword: digital modulation, BER characteristics, cosine rolloff filter, SPT term,
	Summary \| Full Text:PDF(195.3KB)

Experimental Study of Jitter Effect on Digital Downconversion Receiver with Undersampling Scheme Minseok KIM Aiko KIYONO Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Information and Systems Publication Date: 2005/07/01 Vol. E88-D No. 7 pp. 1430-1436 Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Circuits and Systems--Part 1) Category: Communications and Wireless Systems Keyword: clock jitter, undersampling, downconversion, DDC, EVM,
	Summary \| Full Text:PDF(503.8KB)

Implementation of FPGA Based Fast Unitary MUSIC DOA Estimator Minseok KIM Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2004/09/01 Vol. E87-C No. 9 pp. 1485-1494 Type of Manuscript: Special Section PAPER (Special Section on Wave Technologies for Wireless and Optical Communications) Category: Wireless Network System Performances Keyword: adaptive antenna, smart antenna, FPGA implementation, DOA estimation, MUSIC, EVD,
	Summary \| Full Text:PDF(990.2KB)

A Fast Algebraic Approach to the Eigenproblems of Correlation Matrices in DOA Estimation Koichi ICHIGE Masashi SHINAGAWA Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2003/02/01 Vol. E86-B No. 2 pp. 865-869 Type of Manuscript: LETTER Category: Antenna and Propagation Keyword: adaptive array antenna, DOA estimation, eigenproblems, MUSIC method,
	Summary \| Full Text:PDF(397.6KB)

Design of Jacobi EVD Processor Based on CORDIC for DOA Estimation with MUSIC Algorithm Minseok KIM Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2002/12/01 Vol. E85-B No. 12 pp. 2648-2655 Type of Manuscript: Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications) Category: Keyword: adaptive antenna, FPGA implementation, DOA estimation, MUSIC, EVD,
	Summary \| Full Text:PDF(601.7KB)

A Computationally Efficient Algorithm for Exponential B-Splines Based on Difference/IIR Filter Approach Takeshi ASAHI Koichi ICHIGE Rokuya ISHII
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2002/06/01 Vol. E85-A No. 6 pp. 1265-1273 Type of Manuscript: Special Section PAPER (Special Section on Papers Selected from 2001 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2001)) Category: Keyword: B-spline, exponential spline, decomposition, reconstruction,
	Summary \| Full Text:PDF(893.4KB)

An Efficient Algorithm for Decomposition and Reconstruction of Images by Box Splines Takeshi ASAHI Koichi ICHIGE Rokuya ISHII
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/08/01 Vol. E84-A No. 8 pp. 1883-1891 Type of Manuscript: Special Section PAPER (Special Section on Digital Signal Processing) Category: Image/Visual Signal Processing Keyword: box spline, B-spline, decomposition, reconstruction,
	Summary \| Full Text:PDF(1.6MB)

Experiments of DOA Estimation by DBF Array Antenna at 2.6 GHz Kohei MORI Yuki INOUE Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2001/07/01 Vol. E84-B No. 7 pp. 1871-1875 Type of Manuscript: Special Section LETTER (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications) Category: Keyword: DBF array antenna, DOA estimation, MUSIC algorithm, estimation error,
	Summary \| Full Text:PDF(531.9KB)

Concept and Evaluation of a 2-D FDTD Formulation Based on Expanded Wave Equation Approach Koichi ICHIGE Hiroyuki ARAI
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2001/07/01 Vol. E84-C No. 7 pp. 981-993 Type of Manuscript: PAPER Category: Electromagnetic Theory Keyword: computational electromagnetics, FDTD formulation, wave equation, Maxwell's equations,
	Summary \| Full Text:PDF(1.5MB)

A New Formulation for Discrete Box Splines Reducing Computational Cost and Its Evaluation Takeshi ASAHI Koichi ICHIGE Rokuya ISHII
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/03/01 Vol. E84-A No. 3 pp. 884-892 Type of Manuscript: PAPER Category: Image Keyword: box spline, B-spline, interpolation, truncated power,
	Summary \| Full Text:PDF(754.8KB)

A Simple Scheme of Decomposing and Reconstructing Continuous-Time Signals by B-Splines Koichi ICHIGE Masaru KAMADA Rokuya ISHII
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1998/11/25 Vol. E81-A No. 11 pp. 2391-2399 Type of Manuscript: PAPER Category: Digital Signal Processing Keyword: wavelets, B-splines, multifold RRS functions,
	Summary \| Full Text:PDF(622.9KB)