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Recent advances of DSP, microprocessor (MPU), micro-electronics and the antenna in miniature, makes it possible to employ smart antennas (SA) in a mobile station (MS) in next generation mobile communications (3G). Because the processing capacity of MS is relatively weak, to guarantee the smart antenna performance, its algorithm complexity of the smart antenna is very important. In the paper, we propose a low complex algorithm using the auxiliary pilot signals to estimate the channel parameter in the downlink. Via simulation, we evaluate the performance of SA with two elements in terms of the bit error rate (BER). The simulation results show that using SA can improve the performance of the MS significantly.