Power Cotrol Study In Radio Resource Management For 3G WCDMA Network

In this thesis, I mainly have a in-depth study on power control in radio resource managenent for 3G WCDMA network,particularly,on down link closed-loop power control technology.In CDMA system, "multi-address interference" , "near and far problem" and " shading effect" deteriorate the quality of communication, which leading to the system capacity decrease. Power control is introduced to solve these problems effectively. Power control technology is introduced to weak the influence of interference,and to make the transmit power matain the lowest level satisfing SIR requirement. Power control thechnology both help the transmit and reduce the intereference to other users. Thus system capacity can be improved.Recently,large amount of data services are required in downlink direction,which makes more load of downlink.Downlink capacity becomes bottle neck, so, as key technology of WCDMA system, downlink power control is very important. Because bottle neck problem of downlink capacity is more and more prominent, the requirment to down link power control is more and more strict, the study of downlink power control has good practical purport.Link level power control algorithm based on SIR is used in this thesis. With Matlab, the closed loop power control is modeled and programmed. Through analyzing result after simulation,it is proved that system performance using power control is superior to that without using power control.The SIR is computed with the conventional Maximal Likelihood Estimation Algorithm.That is,each path of despreaded...