This work presents the uniform linear Array model of a simple adaptive antenna array based on signal to
interference plus noise ratio (SINR) maximization. A simple adaptive antenna array which can form part of a
WCDMA base station structure was developed. Interference and noise reduction capabilities of an adaptive
antenna array were investigated, comprehensive analysis of omnidirectional antenna and adaptive antenna
array was done based on SINR maximization. The SINR was investigated for a conventional narrow band beam
former by varying the number of the antenna array elements and the number of interfering signals or users. The
principle of adaptive antenna array and mathematical model was deployed. Adaptive antenna as observed from
the analysis indicated great improvement in the SINR over omni-directional antenna. It was discovered as well
that there is significant improvement in SINR as the number of antenna elements increases in the presence of
large interferences for odd number array, precisely when odd numbered elements were used with inter-element
spacing of d = 0.5λ. Improving the interference suppression and noise reduction capabilities of any system in
the presence of large interferers hence increases the capacity of that system. Thus, comparing SINR for d= 0.5λ
and d= 0.75λ, the result obtained showed that SINR for d= 0.5λ is always less than that for d= 0.75λ, therefore
the odd numbered array 9 and 11 gives significant improvement in SINR when compared to even numbered
array with value remaining the same in the presence of six or more interferences. When the reversed, the
desired improvement for high performance antenna system was not achievable.
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