Barrak, S. El, A. El Gonnouni, S. Serrano, A. Puliafito, and A. Lyhyaoui,  "GSM-RF Channel Characterization Using a Wideband Subspace Sensing Mechanism for Cognitive Radio Networks",  WIRELESS COMMUNICATIONS AND MOBILE COMPUTING, vol. 2018, pp. 1?11, 2018.

Soumaya, E. Barrak, L. Abdelouahid, P. Antonio, and S. Salvatore,  "Implementation of a low cost SDR-based Spectrum Sensing Prototype using USRP and Raspberry Pi board",  INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH & ENGINEERING TECHNOLOGY, vol. 20, pp. 54?58, 2017.