Godkända
Analysis of Uplink Multi-Cell Closed Loop Power Control with Imperfect Channel Knowledge
Shengyan Yang (Ja)
Start
2010-05-01
Presentation
2011-01-21 13:15
Plats:
E:3139
Avslutat:
2011-03-14
Examensrapport:
(Kontakta handledare)
Sammanfattning
An important task in cellular mobile networks is transmit power balancing because different path-loss factors lead to user dependent signal power degradations. In addition to energy efficiency aspects an effective power balancing also has to consider inter-cell interference, which is particularly the case for reuse one systems. Moreover, in future cellular mobile networks multiple base stations will perform cooperative signal processing in order to improve spectral efficiency at cell borders. However, in order to exploit the potential gains of such network-MIMO systems, a fair transmit power control has to be employed which achieves a certain target signal-to noise-and-interference ratio of all users. The task of the student is to analyze the robustness of cooperative transmit power control algorithms in the uplink of a multi-user orthogonal frequency division multiple access (OFDMA) system. Based on the 3GPP/LTE physical layer parameter set, in a first step, a scenario with three single antenna users and three single antenna base stations shall be investigated in a classical hexagonal cell setup. In the next step, the student should observe the effect of limited channel information on the performance of power control algorithms. Based on the assumption that the transmit power of each user is calculated at the base station and subsequently fed back to the users, the formed control loop has to be investigated in terms of occurring delays and limited value precisions. Finally, the obtained results shall be verified within a LTE-Advanced prototyping system, provided by the EASY-C project, in order to obtain information about the “real-world” performance of the used algorithms.
Handledare: Michael Grieger (Technical University of Dresden) och Vincent Kotzsch (Technical University of Dresden)
Examinator: Buon Kiong Lau (EIT)