The present invention relates to a space-time array receiving system applying chip level and time reference beamforming techniques to a CDMA wireless communication system. Applying the adaptive beamforming technique using an array antenna to a base station increases power efficiency and reduces unnecessary interference by directionally transmitting and receiving radio waves according to spatial distribution of users, ultimately reducing communication quality and service radius per base station. Subscriber capacity can be increased. In the present invention, a chip level beamforming technique for multiplying a received snapshot signal at a chip level before despreading a weight vector estimated through an adaptive beamforming algorithm while using an existing demodulator structure in a reverse link of a CDMA wireless communication system. Apply. In addition, since the adaptive beamforming algorithm used in the present invention requires a time reference signal in the adaptive optimization process, a reference signal is generated by using the estimated symbol after the Rake synthesis and the spreading code and the channel estimate fed back from the finger receiver of the demodulator. Apply to adaptive optimization process. By doing so, it is possible not only to increase power efficiency by forming optimal directional beams, but also to reduce unnecessary interference to increase communication quality, service radius per base station, and subscriber capacity. In addition, since the present invention can be applied without greatly changing the structure of the existing demodulator, real hardware can be easily implemented.
展开▼