General analysis of downlink power control in CDMA systems

Abstract

The classical analysis of the downlink power control in CDMA cellular systems neglects the background noise in the mobile receivers and leads to a solution for the equalized signal-to-interference ratio by solving an eigenvalue problem. By considering the background noise, we obtain a general solution that includes the previous result and is optimal in the sense that it minimizes the transmitted power. Detailed illustration is presented for an homogeneous system and a general formulation is given for non-homogeneous systems.