Research on the Reciprocity of Transceiver in the Smart Antenna Application

It has been proven in this paper that there are two wrong conclusions in smart antenna (SA) application theory for the CDMA system. Here come the two wrong conclusions: 1) only one SA can make multiple CDMA channels transmit directionally on a single carrier simultaneously. 2) SA transmitting beam forming can be realized by amplitude-weighting of transmitting base band signal just like the receiving beam-forming. Therefore, it is better to study carefully whether the reciprocity of SA can work or not in the aspects above. By the way, the corresponding correct conclusions are shown, which will have a crucial impact on the SA application in CDMA system.