Discrete B-spline functions. - Koichi Ichige; Masaru Kamada (EUSIPCO, 1996)

Quadratic spline interpolator. - Masaru Kamada; Takafumi Endoh; Koichi Ichige; Kazuo Toraichi (Int. J. Syst. Sci., 1996)

An automatic design procedure of IIR digital filters from an analog low-pass filter. - Koichi Ichige; Naohisa Otsuka; Rokuya Ishii (Signal Process., 1997)

An approximation for discrete B-splines in time domain. - Koichi Ichige; Masaru Kamada (IEEE Signal Process. Lett., 1997)

A simple discrete version of B-splines. - Koichi Ichige; Masaru Kamada (Int. J. Syst. Sci., 1998)

Properties of the frequency transformation matrices for IIR digital filters. - Koichi Ichige; Naohisa Otsuka; Rokuya Ishii (Signal Process., 1998)

Design of Jacobi EVD processor based on CORDIC for DOA estimation with MUSIC algorithm. - Minseok Kim; Koichi Ichige; Hiroyuki Arai (PIMRC, 2002)

A hardware implementation of LS-CMA adaptive array for high-speed mobile communication. - Atsushi Suzuki; Shintaro Muramatsu; Koichi Ichige; Hiroyuki Arai (PIMRC, 2002)

A Computationally Efficient Algorithm for Exponential B-Splines Based on Difference/IIR Filter Approach. - Takeshi Asahi; Koichi Ichige; Rokuya Ishii (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002)

Interpolation of signals by generalized piecewise-linear multiple generators. - Koichi Ichige; Thierry Blu; Michael Unser (ICASSP (6), 2003)

Fixed-point digital processing of recursive least-square algorithm toward FPGA implementation of MMSE adaptive array antenna. - Naoya Matsumoto; Koichi Ichige; Hiroyuki Arai (ISSPA (2), 2003)

An automatic recognition algorithm of analogue modulated signals for disturbance rejection. - Eriko Matsuzaki; Koichi Ichige; Hiroyuki Arai (ISSPA (1), 2003)

Experimental Study of Jitter Effect on Digital Downconversion Receiver with Undersampling Scheme. - Minseok Kim; Aiko Kiyono; Koichi Ichige; Hiroyuki Arai (IEICE Trans. Inf. Syst., 2005)

An Explicit High-Resolution DOA Estimation Formula for Two Wave Sources. - Koichi Ichige; Noriaki Takabe; Hiroyuki Arai (ICASSP (4), 2006)

Direction of Arrival Detection System for Radio Surveillance: Frequency Spectrum Analysis of CDMA and Jamming Waves. - Koichi Ichige; Mitsuharu Imai; Hiroyuki Arai; Masayuki Nakano; Masafumi Hirono (VTC Spring, 2006)

An Efficient Signed-Power-of-Two Term Allocation for Filter Coefficients in Digital Communication System. - Koichi Ichige; Hideaki Munemasa; Hiroyuki Arai (IEICE Trans. Commun., 2006)

Accurate Source Number Detection Using Pre-Estimated Signal Subspace. - Yoshihisa Ishikawa; Koichi Ichige; Hiroyuki Arai (IEICE Trans. Commun., 2006)

Filter Effect on Low-IF Multichannel Receiver: How a Simple Filter Improves Digital Communication Quality. - Nozomi Zama; Koichi Ichige (IEICE Trans. Commun., 2006)

The Design of Phoneme Grouping for Coarse Phoneme Recognition. - Kazuhiro Nakadai; Ryota Sumiya; Mikio Nakano; Koichi Ichige; Yasuo Hirose; Hiroshi Tsujino (IEA/AIE, 2007)

High Resolution DOA Estimation Using Second-Order Differential of MUSIC Spectrum. - Koichi Ichige; Yoshihisa Ishikawa; Hiroyuki Arai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

High resolution 2-D DOA estimation using second-order partial-differential of MUSIC spectrum. - Koichi Ichige; Yoshihisa Ishikawa; Hiroyuki Arai (ISCAS, 2008)

High Resolution DOA Estimation Using Unwrapped Phase Information of MUSIC-Based Noise Subspace. - Koichi Ichige; Kazuhiko Saito; Hiroyuki Arai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Efficient Heterodyne Digital Receiver with Direct RF-to-Digital Conversion for Software Defined Radio. - Minseok Kim; Takayuki Moteki; Koichi Ichige; Hiroyuki Arai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Automated Microwave Filter Tuning Based on Successive Optimization of Phase and Amplitude Characteristics. - Yosuke Takeuchi; Koichi Ichige; Koichi Miyamoto; Yoshio Ebine (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

SURE: SimUltaneous Root Extraction method for DOA estimation of coherent sources by ULA. - Koichi Ichige; Hanyang Li; Hiroyuki Arai (SAM, 2012)

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 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Low-cost antenna array via antenna switching for high resolution 2-D DOA estimation. - Yuki Doi; Hiroki Moriya; Koichi Ichige; Hiroyuki Arai; Takahiro Hayashi; Hiromi Matsuno; Masayuki Nakano (SiPS, 2013)

Cuboid array: A novel 3-D array configuration for high resolution 2-D DOA estimation. - Hiroki Moriya; Yuki Doi; Koichi Ichige; Hiroyuki Arai; Takahiro Hayashi; Hiromi Matsuno; Masayuki Nakano (SiPS, 2013)

High-resolution and low-cost direction-of-arrival estimation by 2q-Root-MUSIC method. - Yuta Shikagawai; Koichi Ichige (SiPS, 2013)

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 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Accurate and low-cost DOA estimation method using array covariance matrix elements. - Yu Iwabuchi; Koichi Ichige (APCCAS, 2014)

DOA estimation for low-cost array antenna system based on GROUSE and EM algorithms. - Keita Yamada; Koichi Ichige (APCCAS, 2014)

3-D array configuration using multiple regular tetrahedra for high-resolution 2-D DOA estimation. - Yuki Doi; Koichi Ichige; Hiroyuki Arai; Hiromi Matsuno; Masayuki Nakano (EUSIPCO, 2014)

Antenna switching based on the relation between the relative location of array elements for high resolution 2-D DOA estimation. - Yuki Doi; Koichi Ichige; Hiroyuki Arai; Hiromi Matsuno; Masayuki Nakano (ISCCSP, 2014)

Direction-of-arrival estimation of coherent sources for ULA based on the relation between array covariance matrix elements. - Yu Iwabuchi; Hanyang Li; Koichi Ichige (ISCCSP, 2014)

Multiple snapshot spatial smoothing with improved effective array aperture for high-resolution direction-of-arrival estimation. - Yuki Iizuka; Koichi Ichige (ICICS, 2015)

Non-iterative coding tree depth estimation for H.265/HEVC using neighboring block information. - Jun Ogata; Koichi Ichige (ICICS, 2015)

An efficient Direction-Of-Arrival estimation method for Uniform Rectangular Array based on array covariance matrix element properties. - Koichi Ichige; Yu Iwabuchi (CAMSAP, 2015)

Weighted shooting method for high-resolution DOA estimation based on sparse spectrum fitting. - Koichi Ichige; Naoki Yotsueda (EUSIPCO, 2016)

Real-time moving object tracking using phase-difference compensation and nonuniform pulse transmission. - Koichi Ichige; Nobuya Arakawa; Osamu Shibata (ISCAS, 2016)

Array Correlation Matrix Element Properties and Their Application to Low-Cost DOA Estimation. - Koichi Ichige; Yu Iwabuchi (IEICE Trans. Commun., 2016)

Extended beamforming by sum and difference composite co-array for radio surveillance. - Sho Iwazaki; Koichi Ichige (WIFS, 2017)

Underdetermined Direction of Arrival Estimation by Sum and Difference Composite Co-Array. - Sho Iwazaki; Koichi Ichige (ICECS, 2018)

Fast Intra Mode Decision Method Based on Outliers of DCT Coefficients and Neighboring Block Information for H.265/HEVC. - Jun Ogata; Koichi Ichige (ISCAS, 2018)

Single Image Haze Removal Using Ambient Light Estimation and Region Segmentation. - Yuji Araki; Koichi Ichige (ISPACS, 2018)

Automatic Piano Music Transcription using Low Rank NMF and Convolutional Neural Network. - Takeo Kawashima; Koichi Ichige (ISPACS, 2018)

A note on CRLB formulation for underdetermined DOA estimation in circularly configured planar arrays. - Thomas Basikolo; Koichi Ichige; Hiroyuki Arai (IEICE Electron. Express, 2018)

Nested Circular Array and Its Concentric Extension for Underdetermined Direction of Arrival Estimation. - Thomas Basikolo; Koichi Ichige; Hiroyuki Arai (IEICE Trans. Commun., 2018)

DOA-based Weighted Spatial Filter Design for Sum and Difference Composite Co-Array. - Sho Iwazaki; Koichi Ichige (ICECS, 2019)

Optimum 2D Sparse Array and its Interpolation via Nuclear Norm Minimization. - Shogo Nakamura; Sho Iwazaki; Koichi Ichige (ISCAS, 2019)

Super Nested Sparse Circular Array for High Resolution DOA Estimation. - Steven Wandale; Thomas Basikolo; Koichi Ichige (ISCAS, 2019)

Phase-Difference Compensation and Nonuniform Pulse Transmission for Accurate Real-Time Moving Object Tracking. - Koichi Ichige; Nobuya Arakawa; Ryo Saito; Osamu Shibata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Extended Beamforming by Sum and Difference Composite Co-Array for Real-Valued Signals. - Sho Iwazaki; Koichi Ichige (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

A Note on The Maximum Number of Sources in DOA Estimation by MODE. - Shohei Hamada; Koichi Ichige (SAM, 2020)

On the DOA Estimation Performance of Optimum Arrays Based on Deep Learning. - Steven Wandale; Koichi Ichige (SAM, 2020)

DOA-Based Weighted Spatial Filter Design for Sum and Difference Composite Co-Array. - Sho Iwazaki; Shogo Nakamura; Koichi Ichige (IEICE Trans. Commun., 2020)

A Nested Array Geometry with Enhanced Degrees of Freedom and Hole- Free Difference Coarray. - Steven Wandale; Koichi Ichige (EUSIPCO, 2021)

High Accuracy Video Foreground Segmentation Based on Feature Normalization. - Yuma Suzuki; Koichi Ichige (ISCIT, 2021)

ECG Signal Reconstruction Using FMCW Radar and Convolutional Neural Network. - Daiki Toda; Ren Anzai; Koichi Ichige; Ryo Saito; Daichi Ueki (ISCIT, 2021)

On The Building Map for Radio Propagation Prediction Using Machine Learning. - Kazuya Inoue; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (PIMRC, 2021)

Simulated Annealing Assisted Sparse Array Selection Utilizing Deep Learning. - Steven Wandale; Koichi Ichige (IEEE Access, 2021)

Design of sparse arrays via deep learning for enhanced DOA estimation. - Steven Wandale; Koichi Ichige (EURASIP J. Adv. Signal Process., 2021)

Single Image Haze Removal Using Iterative Ambient Light Estimation with Region Segmentation. - Yuji Araki; Kentaro Mita; Koichi Ichige (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Optimization and Hole Interpolation of 2-D Sparse Arrays for Accurate Direction-of-Arrival Estimation. - Shogo Nakamura; Sho Iwazaki; Koichi Ichige (IEICE Trans. Commun., 2021)

Flexible Extended Nested Array with Multiple Subarrays Achieving Improved Degrees of Freedom. - Steven Wandale; Koichi Ichige (EUSIPCO, 2022)

Learning-Based Path Loss Estimation Using Multiple Spatial Data and System Parameters. - Kazuya Inoue; Keita Imaizumi; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (VTC Fall, 2022)

Accurate Source-Number Estimation Using Denoising Preprocessing and Singular Value Decomposition. - Shohei Hamada; Koichi Ichige; Katsuhisa Kashiwagi; Nobuya Arakawa; Ryo Saito (IEICE Trans. Commun., 2022)

Flexible extended nested arrays for DOA estimation: Degrees of freedom perspective. - Steven Wandale; Koichi Ichige (Signal Process., 2022)

Feature Extraction Using Hough Transform in Radio Propagation Estimation. - Rento Hagiwara; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (VTC Fall, 2023)

Low-Cost Path Loss Estimation Using Correlation Graph CNN with Novel Feature Parameters. - Keita Imaizumi; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (VTC2023-Spring, 2023)

Sparse Array Design for Direction Finding using Deep Learning. - Kumar Vijay Mishra; Ahmet M. Elbir; Koichi Ichige (CoRR, 2023)

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 (IEICE Trans. Commun., 2023)

A Generalized Extended Nested Array Design via Maximum Inter-Element Spacing Criterion. - Steven Wandale; Koichi Ichige (IEEE Signal Process. Lett., 2023)

xMISC: Improved Sparse Linear Array via Maximum Inter-Element Spacing Concept. - Steven Wandale; Koichi Ichige (IEEE Signal Process. Lett., 2023)

Low-Cost Learning-Based Path Loss Estimation Using Correlation Graph CNN. - Keita Imaizumi; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

An Edge-Enhanced Branch for Multi-Frame Motion Deblurring. - Sota Moriyama; Koichi Ichige (IEEE Access, 2024)

Video Reflection Removal by Modified EDVR and 3D Convolution. - Sota Moriyama; Koichi Ichige; Yuichi Hori; Masayuki Tachi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024)

Diffusion Model-Based Virtual 3D City Augmentation for EM-Wave Propagation Analysis. - Rento Hagiwara; Kazuki Yuasa; Koichi Ichige; Tatsuya Nagao; Takahiro Hayashi (IEEE Access, 2025)