Preprocessing by eigenbeams and Doppler filters to improve performance of detection of signal number. - Ryuhei Takahashi; Kazufumi Hirata; Hisakazu Maniwa (ACSCC, 2008)

Derivation of monopulse angle accuracy for phased array radar to achieve Cramer-Rao lower bound. - Ryuhei Takahashi; Kazufumi Hirata; Teruyuki Hara; Atsushi Okamura (ICASSP, 2012)

Time Shift Parameter Setting of Temporal Decorrelation Source Separation for Periodic Gaussian Signals. - Takeshi Amishima; Kazufumi Hirata (IEICE Trans. Commun., 2013)