Peschke, Sven, and Reinhold Haeb-Umbach. “Velocity Estimation of Mobile Terminals by Exploiting GSM Downlink Signalling.”10.1109/WPNC.2007.353637__4th Workshop on Positioning Navigation and Communication (WPNC 2007), 2007, pp. 217–22, doi:10.1109/WPNC.2007.353637.