MIMO Measurements on Indoor Nakagami-m Fading Channels

Mats Helin

Master Thesis, Report UPTEC F02xxx, Januari 2002.

Abstract:

Multiple-input multiple-output (MIMO) channels in an indoor environment have been measured and the capacity has been calculated. The capacity is calculated both when the mutual coupling between different antenna elements has been compensated for and when it is not. The capacity for MIMO systems architecture has been compared with single-input single-output (SISO) systems and also the capacity when the transmitter has access to channel state information (CSI), which can optimise the capacity. It has been shown that CSI at the transmitter always achieves maximum capacity and increases the capacity when there is a Line Of Sight (LOS) channel and/or the SNR are low. To describe the fading in the channel the Nakagami m distribution has been used and two different estimators of the m-parameter, one based on the ML-method and the other on the Moment method. The result was equally good but as the Moment method has a less complex algorithm it is a better choice. A novel method that increases the independent fading between different antenna-elements has been presented and proven useful.

Report:

Master Thesis report in Postscript (1.4 MB)
Master Thesis report in Word 2000 (3 MB)

Organization:

Signals and Systems Group

Thesis Advisor:

Mattias Wennström