APPARATUS AND METHOD USING SMART ANTENNA IN FDD WIRELESS COMMUNICATION SYSTEM

摘要

Present invention relates to an apparatus and a method using smart antenna in frequency division duplex code division multiple access communication system, for resolving a limitation of smart antenna use due to asymmetric propagation of uplink electric wave and downlink electric wave. Wirless base station has a smart antenna array for transmitting and receiving, a relevant RF transmitter and receiver, and a common baseband signals processor. The method of this invention is to determine main link direction by using a estimates of signal DOA (direction of arrival) obtained from a received signals; in downlink beamforming manner, synthesize a expectantly obtained transmitting beam shape based on the main direction. The system can obtain an advantage of smart antenna, thereby improving coverage of cell, increasing capacity and reducing cost.