TY - GEN
T1 - Error statistics of closed-loop power control in Multirate DS-CDMA cellular systems
AU - Wang, Li Chun
AU - Chang, Chih Wen
N1 - Publisher Copyright:
© 2002 IEEE.
PY - 2002
Y1 - 2002
N2 - In this paper, 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 will be shown that the close-loop power control error is a composite function of spreading factor, target E, / N9 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.
AB - In this paper, 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 will be shown that the close-loop power control error is a composite function of spreading factor, target E, / N9 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.
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U2 - 10.1109/WCNC.2002.993355
DO - 10.1109/WCNC.2002.993355
M3 - Conference contribution
AN - SCOPUS:66149083887
T3 - IEEE Wireless Communications and Networking Conference, WCNC
SP - 712
EP - 716
BT - IEEE Wireless Communications and Networking Conference, WCNC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2002 IEEE Wireless Communications and Networking Conference, WCNC 2002
Y2 - 17 March 2002 through 21 March 2002
ER -