Ytelse for multippel antenne teknikker i LTE

Abstract

This thesis is about doing test runs at an LTE base station at Telenor at Fornebu. The tests are performed to find out how good the systems work, and specifically for this thesis to explore the possibilities of spectral bandwidth gain exploiting multiple antenna and spatial multiplexing. All tests were done by vehicle at Oksenøya outside Oslo. The tests were done at approximately between 20 and 40 kph. The main tests resulted in 16 test-files with combinations of 4 different physical antenna configurations and 4 different transmission modes, driving theroute in both directions. Since Telenor's equipment at the moment only supports 2x2 MIMO, therewas no testing of higher channel ranks than 2. The antenna configurations was combinations of co-polarity and cross-polarity and co-located and distance separated antennas.The interesting aspect of this thesis is to fin if it is possible to use co-located antennasonly for 2x2 MIMO, 4x2 MIMO and 4x4 MIMO, which may result in large outcome savings when deploying LTE for commercial use. It was not expected to perform as good as a distance separated antenna configuration.The results was not concluding, but gave an indication to that the MIMO performance will suffer dramatically from this setup, and leaves the question of what will be the best solution. This is a question that will have to be answered by more test results.