Implementación de un transmisor y receptor de LTE basado en software defined radio (SDR) para el laboratorio de comunicaciones de la FIE.

Abstract

The implementation of a Long-Term Evolution (LTE) transmitter and receiver based on Software Defined Radio (SDR) for the FIE communications laboratory was carried out through the study of the LTE mobile communication standard, SDR and the srsRAN software. For the development of the research project, the work was distributed in three phases consisting of configuration and installation where drivers, software and SIM cards were installed; in the second phase, the description and implementation of scenarios was carried out where a computer was used as User Equipment for the first scenario and a mobile phone was used for the second scenario; As a final phase, connectivity tests were carried out with the User Equipment. The results obtained were a video transmission in which, through a graphical interface, the response of the channel and the modulation of the channels in Uplink and Downlink could be observed in real time, a comparison was obtained between a MIMO and SISO transmission in which was able to determine that a MIMO transmission provides greater capacity but a SISO transmission is more stable, Indoor and Outdoor measurements were also carried out where the signal quality conditions were analyzed and an analysis of the transmitted signal was carried out with the help of a spectrum analyzer where a complete review of the signal was obtained. With the values obtained in the measurements, it can be concluded that the signal shows cell border conditions both in Indoor and Outdoor, considering the worst case, and the signal meets LTE conditions and does not generate interference in neighboring channels. It is recommended to continue testing with the LTE transmitter and receiver and use it for laboratories.