Indoor RF Fingerprinting using leaky feeder cable considering environmental changes. - Mark Weber; Ulrich Birkel; Ralf Collmann (Mobility Conference, 2009)

Comparison of various methods for indoor RF fingerprinting using leaky feeder cable. - Mark Weber; Ulrich Birkel; Ralf Collmann; Julia Engelbrecht (WPNC, 2010)

Advantage of Non-Periodic Leaky Coaxial Cable Structures for Indoor Positioning. - Julia Engelbrecht; Ralf Collmann; Ulrich Birkel; Mark Weber (VTC Fall, 2011)

First results of a leaky coaxial cable prototype for indoor positioning. - Julia Engelbrecht; Ralf Collmann; Ulrich Birkel; Mark Weber (WTS, 2011)

Indoor localization with UMTS compared to WLAN. - Ulrich Birkel; Mark Weber (IPIN, 2012)

Radiating cable for indoor localization using UMTS. - Ulrich Birkel; Mark Weber; Ralf Collmann (UPINLBS, 2012)

A Systematic Analysis of Narrowband IoT Quality of Service. - Andreas Philipp Matz; Jose-Ángel Fernández-Prieto; Joaquín Cañada Bago; Ulrich Birkel (Sensors, 2020)

The Narrowband Bundling Protocol. - Andreas Philipp Matz; Jose-Ángel Fernández-Prieto; Joaquín Cañada Bago; Ulrich Birkel (IEEE Wirel. Commun. Lett., 2022)