A Feasible Method to Implement Optimum Cir-Balanced Power Control in CDMA Cellular Mobile Systems

Abstract

The optimum power control (OPC) with carrier-to-interference ratio (CIR) is obtained by solving eigenvalue problems of link-gain matrices. In this paper, we propose a feasible scheme to implement the CIR balancing power control. A two-level hierarchical power control structure is proposed to carry out the OPC without involving the eigen-decomposition. The shortages of unbalanced CIR and global outage are two common issues for CIR-balanced power control. To tackle these two problems, a simple linear prediction method and an adaptive on-off strategy are proposed. Furthermore, because of the capacity limitation of wireless communications, a differential pulse code modulation (DPCM) scheme is presented to reduce the number of bits required for the transmission of command words in the two-hierarchy power control structure. Finally, simulation results and conclusions are given.