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IEICE Trans

Koji NISHIMURA

Integrating DDMA and CDMA MIMO Radar Functionalities into SIMO Systems: A Case Study with the MU Radar
Tomoya MATSUDA Koji NISHIMURA Hiroyuki HASHIGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2025/08/01
Vol. E108-B  No. 8  pp. 891-901
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Commemoration of Yagi-Uda Antenna 100th Anniversary)
Category: 
Keyword: 
atmospheric radar, Doppler division multiple access, code division multiple access, phased array, transmit phase adjustment, matched filter, MIMO, 
 Summary | Full Text:PDF
Velocity Estimation beyond Nyquist Limit for Pulse Doppler Radars Using Pulse-Compressed Signals Correlated with Divided Reference Signals
Takafumi NAGANO Tomonori FUKUTA Koji NISHIMURA Hiroyuki HASHIGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2025/04/01
Vol. E108-B  No. 4  pp. 540-552
Type of Manuscript:  PAPER
Category: Sensing
Keyword: 
pulse Doppler radar, Nyquist velocity, ambiguity resolution, Cramér-Rao lower bound, 
 Summary | Full Text:PDF
DDMA-MIMO/Capon Observations Using the MU Radar: Beamwidth Verification Using the Moon’s Reflection
Tomoya MATSUDA Koji NISHIMURA Hiroyuki HASHIGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2024/11/01
Vol. E107-B  No. 11  pp. 754-764
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
atmospheric radar, Capon beamformer, Doppler Division Multiple Access, phased array, MIMO, 
 Summary | Full Text:PDF
Analytical Expression of Capon Spectrum for Two Uncorrelated Signals Using the Inner Product of Mode Vectors
Takuya SAKAMOTO Koji NISHIMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2020/04/01
Vol. E103-B  No. 4  pp. 452-457
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
Capon method, antenna array, mode vectors, 
 Summary | Full Text:PDF
Adaptive Sidelobe Cancellation Technique for Atmospheric Radars Containing Arrays with Nonuniform Gain
Taishi HASHIMOTO Koji NISHIMURA Toru SATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/12/01
Vol. E99-B  No. 12  pp. 2583-2591
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
atmospheric radars, partial adaptivity, robust adaptive beamforming, clutter suppression, 
 Summary | Full Text:PDF
Two-Dimensional Arrays Optimized for Wide-Scanning Phased Array Based on Potential Function Method
Koji NISHIMURA Toru SATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/10/01
Vol. E92-B  No. 10  pp. 3228-3235
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
two-dimensional array optimization, adaptive array, sidelobe reduction, 
 Summary | Full Text:PDF
High Sensitivity Radar-Optical Observations of Faint Meteors
Koji NISHIMURA Toru SATO Takuji NAKAMURA Masayoshi UEDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2001/12/01
Vol. E84-C  No. 12  pp. 1877-1884
Type of Manuscript:  Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
meteor observation, MU radar, ICCD video camera, sensor fusion, space environment, 
 Summary | Full Text:PDF
Orbit Determination of Meteors Using the MU Radar
Toru SATO Takuji NAKAMURA Koji NISHIMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/09/25
Vol. E83-B  No. 9  pp. 1990-1995
Type of Manuscript:  Special Section PAPER (Special Issue on Advances in Radar Systems)
Category: 
Keyword: 
meteor observation, MU radar, orbit determination, Doppler pulse compression, space environment, 
 Summary | Full Text:PDF