A bat-like sonar system consisting of hardware digital correlators. - Kenji Nakahira; Tetsuji Kodama; Takeshi Furnhashi; Hiroshi Maeda (SMC, 2000)

Distance measurement by an ultrasonic system based on a digital polarity correlator. - Kenji Nakahira; Tetsuji Kodama; Shin Morita; Shigeru Okuma (IEEE Trans. Instrum. Meas., 2001)

Design of digital polarity correlators in a multiple-user sonar ranging system. - Kenji Nakahira; Tetsuji Kodama; Takeshi Furuhashi; Hiroshi Maeda (IEEE Trans. Instrum. Meas., 2005)

Minimum-Error Discrimination Between Self-Symmetric Mixed Quantum State Signals. - Kenji Nakahira; Tsuyoshi Sasaki Usuda (IEEE Trans. Inf. Theory, 2012)

Error performance for non-destructive quantum receiver of M-ary coherent-state signals. - Kazuki Sato; Kenji Nakahira; Shogo Usami; Tsuyoshi Sasaki Usuda (ISITA, 2014)

Finding Optimal Solutions for Generalized Quantum State Discrimination Problems. - Kenji Nakahira; Tsuyoshi Sasaki Usuda; Kentaro Kato (IEEE Trans. Inf. Theory, 2017)

Error performance and robustness of optimum quantum detection for MPSK signals in the presence of phase noise. - Tiancheng Wang; Kenji Nakahira; Tsuyoshi Sasaki Usuda (ISITA, 2018)

Realizing a 2-D Positive Operator-Valued Measure by Local Operations and Classical Communication. - Kenji Nakahira; Tsuyoshi Sasaki Usuda (IEEE Trans. Inf. Theory, 2018)