Real-Time User Position Estimation in Indoor Environments Using Digital Watermarking for Audio Signals. - Ryosuke Kaneto; Yuta Nakashima; Noboru Babaguchi (ICPR, 2010)

Indoor Positioning System Using Digital Audio Watermarking. - Yuta Nakashima; Ryosuke Kaneto; Noboru Babaguchi (IEICE Trans. Inf. Syst., 2011)