Wcdma Channel Calibration Algorithm

Market demand for mobile communica t ions services, both for speech and high rate data transmission, is growing constantly. Adaptive antennas at the base station are among the technologies that are able to satisfy this demand for more capacity and coverage. Antenna arrays in combination with digital signal processing allow the exploitation of the spatial domain on top of the other multiple access techniques the system already employs (time, frequency, code ). But when smart antenna is applied in practice, one has always to cope with an imperfect tranceiver hardware. The goal of this thesis is to investigate the influence of such imperfections on the uplink and downlink performance of the system and calibrate the difference of train. By means of simulations I found that above all, gain and phase imbalances between the individual tranceiver trains worsen the tranceivers performance, the adaptive-calibration algorithm is much more robust against the influence of hardware imperfections. Because of limitations caused by imperfections, the tranceiver has to be calibrated. 1 design a calibarating systerm to calibrate the difference of the individual trains in digital field. The result shows the adaptive-calibartion algorithm is feasible.