Diploma and Master Theses (authored and supervised):
M. Lobinger:
"Distributed Antenna Systems in 5G Mobile Communications";
Supervisor: S. Schwarz, C. Mendoza;
E389,
2021;
final examination: 2021-11-18.
English abstract:
This thesis analyses DASs regarding various topics. The thesis starts with the development of a single-user DAS and the used hybrid beamforming is investigated. This includes user grouping based on channel characteristics with a threshold test and a specific grouping algorithm, used for the beamforming. The first part ends with a comparison of a DAS and a macro cell. In the second part, the system model is extended to a multi-user system and the following topics are analyzed. First, the variation of general parameters like the number of antenna array elements and radio frequency (RF) chains are analyzed. After that, a realistic per RF chain power constraint is investigated. Then channel estimation errors are introduced and compared to a codebook-based beamforming strategy and the needed number of feedback bits. Thereafter scheduling aspects are covered. The thesis ends with a comparison of a multi-user DAS to small cells. All mentioned aspects were implemented and simulated with the Vienna
5G System Level Simulator.
Created from the Publication Database of the Vienna University of Technology.