The analytical evaluation of closed-loop power-control error statistics inDS-CDMA cellular systems

This paper proposes an analytical study that aims at evaluating the power-c ontrol error statistics in wireless direct-sequence code-division multiple- access (DS-CDMA) cellular systems based on an ideal variable step closed-lo op power-control scheme, In particular, the cumulative distribution functio n and the correlation coefficient of the power control error are derived th rough a first-order Taylor expansion of the received signal envelope. A nov el power-control scheme that exploits the autocorrelation properties of the fading is also proposed, and its performance is analyzed in terms of power -control error statistics. Rayleigh and Rice frequency-selective channel mo dels, which involve the use of a diversity RAKE receiver at the base statio n, have been taken into account. The proposed analytical approach specifica lly applies to CDMA systems. A method that aims at estimating the capacity of a DS-CDMA cellular network is given in the last part of this paper.