Patent ID: 7027421

Claim:
A code division multiple access (CDMA) base station system, comprising: an array antenna receiving a signal; a multi-channel down-conversion means for down-converting the signal received through the array antenna to generate a digital signal; a calibration means for injecting an RF reference signal into the multi-channel down-conversion means to generate a baseband digital reference signal, analyzing the baseband digital reference signal to estimate a transfer function of the multi-channel down-conversion means and correcting an error of the transfer function of multi-channel down-conversion means; a two-dimensional searching means for spatial-filtering the digital signal to generate a spatial-filtered signal and correlating the spatial-filtered digital signal with a pseudo noise (PN) to thereby detect the signal and acquire corresponding code timings; and an adaptive array demodulation means for performing a beamforming operation and demodulating received data through a despreader and a rake receiver.