The performance of smart antenna in DS/CDMA(direct sequence/code division multiple access) systems is investigated when there are mutual coupling and/or excitation error which is compared with that in ideal situations. As an example, it is shown from the simulation that for adaptive arrays with half-wavelength spaced elements even there exist mutual coupling and/or excitation error, the radiation pattern's main beam can still point to the arrival direction of the desired signal. However, the interference cancellation ability decreases in some degrees and the effect of mutual coupling between array elements on the beamforming performance of adaptive arrays is more serious. So the mutual coupling should be taken into account in order to improve the performance.
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