Download MASTER`S THESIS

Tervo N. (2014) Virtual Antenna Array Based MIMO Radio Channel Measurement System at 10 GHz. University of Oulu, Department of Communications Engineering, Degree Programme in Electrical Engineering. Master’s Thesis, 58 p.
ABSTRACT
In this thesis, a 10 GHz multiple-input multiple-output radio channel measurement system using four port vector network analyzer and virtual antenna arrays
in both transmitter and receiver ends is presented. The channel measurement system measures each single antenna channel separately. The radio propagation environment is assumed to be static during the recordings. As an antenna element,
a dual polarized patch antenna with two feeding ports is used. Linear stages and
programmable stepper motors are utilized to build an XY-gantry to move the antenna element in a plane. The stepper motors and the vector network analyzer
are controlled by the same measurement control software. The basic principles of
the control software are also presented along the measurement system.
Three channel measurement scenarios and their initial results are presented to
verify the system operation and to demonstrate the system in different cases. A
verification measurement is performed in an anechoic chamber to verify that the
system does not cause internal spurious responses to the results. The next measurement is performed in a classroom to demonstrate the multipath propagation
environment. Furthermore, an indoor wall penetration loss measurement from
the classroom to another is made to show that the measurement system can also
be applied for the measurements requiring an accurate antenna shifting between
the measurement points. The results measured with this setup can be applied
angular domain algorithms to estimate the direction of arrival and departure,
respectively.
Keywords: millimeter-wave, static channel modeling, massive MIMO channel
measurements.