Dynamic presentation system for an adaptive DCS-1800 base station antenna
Master Thesis, UPTEC Report 97 006E, 75 pages, January 1997
Report, available in Postscript : compressed(.zip)
Using adaptive antennas in telecommunication has several benefits. The
coverage can be extended by using an array of antennas instead of a single
base station antenna. Alternatively can the transmitted power be reduced.
The capacity and quality can be improved by suppressing interfering signal
sources and this capacity improvement is obtained by reducing the reuse
factor (i.e. the distance between two cells using the same frequency set).
An adaptive antenna test bed for the DCS-1800 system has been built at
Uppsala University in cooperation with Ericsson Radio Access AB..
A presentation system for an adaptive DCS-1800 base station antenna have
been developed. The radiation pattern and bit error rates are presented
in real time.We use the weights from the adaptive algorithm to calculate
the radiation pattern.
Calibration data is used to compensate for differences
in signal paths due to imperfections in hardware. The weights are sent
via a serial interface to a presentation computer. A graphical programming
language, HP-VEE is used to create the program that presents the information.
The bit error rates are logged from a base station testing equipment that
simulates both the transmitting mobile and the receiving base station connected
to the adaptive antenna system.
Several antenna radiation patterns were measured and
compared with the corresponding calculated patterns. Good agreement with
real antenna pattern was achieved
Ericsson Radio Access AB
Andersson, M Landing, A
Rydberg , T