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Error statistics of closed-loop power control in multirate DS-CDMA cellular systems

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2 Author(s)
Li-Chun Wang ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Chih-Wen Chang

We investigate the error statistics of the close-loop power control scheme with variable spreading factors for the multi-rate services in the third generation wideband CDMA (WCDMA) system. We demonstrate that the long scrambling pseudo-noise code, besides its well known feature in differentiating users and base stations, can improve power control false command over a frequency-selective fading channel as well. Our computer simulation results indicate that the SIR measurement error can be reduced by 3 dB in a typical case, and the power control false command can be reduced from 27 % to 10 % in comparison to using pure short Walsh codes. It is shown that the close-loop power control error is a composite function of the spreading factor, target Eb / No and Doppler frequency. The statistics of closed loop power control false command can be easily characterized by a Bernoulli distribution with a parameter provided by our results.

Published in:

Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE  (Volume:2 )

Date of Conference:

Mar 2002