Adaptive Antenna Array Algorithms and Their Impact on Code Division Multiple Access Systems (CDMA).
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Date
2004-03
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Addis Ababa University
Abstract
In mobile communications there is a need to increase the channel capacity.
The increasing demand for mobile communication services without a
corresponding increase in RF spectrum allocation (channel capacity) motivates
the need for new techniques to improve spectrum utilization. The CDMA and
adaptive antenna array are two approaches that shows real promise for
increasing spectrum efficiency. This research focuses on the application of
adaptive arrays to the Code Division Multiple Access (CDMA) cellular systems.
The adaptive antenna has an intelligent control unit, so the antenna can follow
the user, direct the radiation pattern towards the desired user, adapt to varying
channel conditions and minimize the interference. Therefore there can be several
users in the same channel in the same cell. The driving force of this intelligent
control unit are special kinds of algorithms and we are going to investigate the
performance of these different adaptive array algorithms in the CDMA systems.
Four each blind adaptive array algorithms are developed, and their performance
under different test situations (e. g. AWGN (Additive White Gaussian Noise)
channel, and multipath environment) is studied. A MATLAB test bed is created
to show their performance on these two test situations and an optimum one can
be selected.
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Access Systems