Mathematical modeling of the CDMA channel under power control

Author

Kumar, Rajendra

Author_Institution

Dept. of Electr. Eng., California State Univ., Long Beach, CA, USA

Volume

1

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

17

Abstract

In CDMA systems, it is extremely important to be able to control the power transmitted by various user terminals to within very tight limits of their respective allocated power levels. However, in practice due to various uncertainties such as the variations in link margin and channel fading, the accuracy achievable in the power control is limited. This paper presents mathematical models for the self interference in the CDMA system due to such power level variations and its impact on the capacity of the CDMA system wherein multiple user classes are involved which have different energy per bit to total noise power spectral density (E_b/N_0t) requirements.

Keywords

channel capacity; closed loop systems; code division multiple access; fading channels; log normal distribution; multipath channels; power control; sensitivity analysis; CDMA channel modeling; Gaussian distribution; channel bandwidth; channel power control; closed loop power control; energy per bit to total noise power spectral density; lognormal distribution; multipath fading; multiple user classes; power level variations; propagation delay; self-interference limited system; sensitivity analysis; system capacity; user terminal power control; Fading; Frequency division multiaccess; Interference; Mathematical model; Multiaccess communication; Noise level; Power control; Propagation delay; Signal to noise ratio; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1399908

Filename

1399908