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Some results on power control in wideband CDMA cellular networks

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4 Author(s)
Giovanardi, A. ; Dipt. di Fisica, Ferrara Univ., Italy ; Mazzini, G. ; Tralli, V. ; Zorzi, M.

A general setup for simulating a WCDMA cellular system has been developed to estimate the performance, in terms of both the signal-to-interference ratio (SIR) and error burst statistic. Here, the analysis has been focused on closed loop power control in order to characterize the performance as a function of the control delay and the step size in different conditions. The simulator takes into account a hexagonal geometry with spatially uniform user distribution and a propagation channel characterized by distance attenuation, log-normal slow fading, and Rayleigh fast fading. The system is based on a wideband CDMA radio interface with RAKE receiver, convolutional coding with Viterbi decoding, and interleaving to counteract burst error occurrences. A relationship between the power control loop and the Doppler frequency trend is underlined in the numerical investigation. In particular, a power control delay increase could be related to an “equivalent” Doppler frequency increase. Furthermore, the sensitivity of the performance to the power control step size as a function of the Doppler frequency is shown

Published in:

Wireless Communications and Networking Confernce, 2000. WCNC. 2000 IEEE  (Volume:1 )

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