Research on the SA Application in the TDD-SCDMA System
Xuehui Huang · Journal of Nanjing University of Posts and Telecommunications · 2008
It is wrongly holded by all the references found on hand about SA application that only one SA can make multiple CDMA channels transmit directionally on a single carrier synchronously,and SA transmitting beamforming can be realized with weighted transmitting baseband signal without phase shifting.This paper proves that the above two points of view cannot be realized by the basic principle of SA-the phase array antenna with the feature of directionally-launching.TD-SCDMA standard and the system with SA are both built on the basis of the above two wrong theories.A strange system will appear in which uplink capacity is larger than that of the downlink,since trasmitting directionally on multiple coded channels synchronously cannot be realized,but it can make use of the directional or diversity reception of SA,which is opposite from that the 3G standard should serve for mible internet.Additionanlly,the transceiver equipment in BS for TD-SCDMA cannot work synchronously so that the utilization of the equipment energy will drop half.