Electrical & Computer Engineering Faculty Publications

Document Type

Article

Publication Date

8-1-2000

Abstract

In wireless cellular communication, it is essential to find effective means for power control of signals received from randomly dispersed users within one cell. Effective power control will heavily impact the system capacity. Distributed power control (DPC) is a natural choice for such purposes, because, unlike centralized power control, DPC does not require extensive computational power. Distributed power control should be able to adjust the power levels of each transmitted signal using only local measurements, so that, in a reasonable time, all users will maintain the desired signal-to-interference ratio. In this paper, we review different approaches for power control, focusing on CDMA systems. We also introduce state-space methods and linear quadratic power control (LQPC) to solve the power-control problem. A simulation environment was developed to compare LQPC with earlier approaches. The results show that LQPC is more effective, and is capable of computing the desired transmission power of each mobile station in fewer iterations, as well as being able to accommodate more users in the system.

Publisher

IEEE

Publication Title

IEEE Antennas and Propagation Magazine

ISSN

1045-9243

Volume

42

Issue

4

First Page

152

Last Page

159

DOI

10.1109/74.868061

Language (ISO)

English

Sponsorship

IEEE

Keywords

Land mobile radio cellular systems, wireless communications, CDMA, power control, reactive power control, centralized power control, distributed power control, linear quadratic control

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