Ray-based Propagation Modeling for OFDM-based Mobile Networks

Ray-based Propagation Modeling for OFDM-based Mobile Networks

Bokiye, A.M.

Coccia, A. (mentor)
Nikookar, H. (mentor)
Mantel, O.C. (mentor)

Electrical Engineering, Mathematics and Computer Science

Telecommunications

2009-07-10

The demand for high data rate is ever increasing. OFDM-based wideband systems such as LTE and WiMAX are being employed as they can provide such high data rates. The performances of these systems not only depend on SNR but also on wideband arameters such as delay spread and angular spread. Obstacles (buildings, trees, vehicles, lamp posts, etc.) in radio propagation environment can cause reflection, diffaction and scattering ofthe radio signal. This results in attenuation, dispersion in time and spreading in angle of the radio signal at the receiver. The resulting delay spread and angular spread affect the performance of OFDM and MIMO technologies respectively, which are adopted for future mobile network systems (LTE and WiMAX). To evaluate the performance of wideband OFDM-MIMO systems, it is therefore important that these wideband parameters be accurately predicted. Propagation modeling based on ray-tracing can be used to predict these wideband parameters. To this end, the prediction accuracies that these models can provide in different scenarios have to be evaluated. In this thesis, the prediction accuracy of received power, delay spread and angular spread that was achieved by using 3D ray-tracing prediction model has been evaluated by comparing predictions with wideband field measurements. The prediction results showed reasonable agreement with the measurements. The effects of parameter settings of ray-based propagation model on the predictions were also studied and the results are presented in this thesis.

ray-tracing modeling
OFDM systems
predictions of wideband parameters

http://resolver.tudelft.nl/uuid:5ed52960-e32a-4316-b04a-ebbfef747ccf

Student theses

master thesis

(c) 2009 Bokiye, A.M.