Title :
Mathematical modeling of the CDMA channel under power control
Author_Institution :
Dept. of Electr. Eng., California State Univ., Long Beach, CA, USA
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 (Eb/N0t) 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;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1399908
