Outage events in a DS-CDMA wireless system with closed-loop power control

This paper deals with characterization of second order outage statistics in the reverse link of a DS-CDMA wireless system with closed-loop power control. By means of a specifically developed simulation tool, the mean and the autocovariance of the received power level of the user signal and of the signal-to-interference ratio (SIR) at the base station are estimated. Both cases of the power control algorithm operating on a power target basis and on a SIR target basis are considered. The average rate and duration of related outage events are estimated, as well. In this framework minimum duration outages are also considered. Numerical results are reported as obtained in a multicell environment with Rayleigh fading and shadowing. It is seen that a slow power update may determine a sudden increase of the standard deviation of the user signal power and SIR residual fluctuations. Moreover, the residual burstiness of the controlled channel may be responsible of long outages.

[1]  F. Santucci,et al.  Analysis of second order statistics of the SIR in cellular mobile networks , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[2]  Andrea Abrardo,et al.  Outage statistics in CDMA mobile radio systems , 2000, IEEE Communications Letters.

[3]  Fortunato Santucci,et al.  Distribution of outage intervals in macrodiversity cellular systems , 1999, IEEE J. Sel. Areas Commun..

[4]  Chung-Ju Chang,et al.  Design of power control mechanisms with PCM realization for the uplink of a DS-CDMA cellular mobile , 1996 .

[5]  N. Mandayam,et al.  Minimum duration outage for cellular systems: a level crossing analysis , 1996, Proceedings of Vehicular Technology Conference - VTC.

[6]  Norman C. Beaulieu,et al.  The generation of correlated Rayleigh random variates by inverse discrete Fourier transform , 2000, IEEE Trans. Commun..

[7]  Andrew J. Viterbi,et al.  Performance of power-controlled wideband terrestrial digital communication , 1993, IEEE Trans. Commun..

[8]  Sirikiat Lek Ariyavisitakul,et al.  Signal and interference statistics of a CDMA system with feedback power control , 1993, IEEE Trans. Commun..

[9]  N. C. Beaulieu,et al.  On the generation of correlated Rayleigh random variates by inverse discrete Fourier transform , 1996, Proceedings of ICUPC - 5th International Conference on Universal Personal Communications.

[10]  Jack M. Holtzman,et al.  Minimum Duration Outage for CDMA Cellular Systems: A Level Crossing Analysis , 1996, Wirel. Pers. Commun..

[11]  Jack M. Holtzman,et al.  Direct Sequence CDMA Power Control, Interleaving, and Coding , 1993, IEEE J. Sel. Areas Commun..

[12]  L. B. Milstein,et al.  Performance of closed-loop power control in DS-CDMA cellular systems , 1998 .

[13]  Michele Zorzi Outage and error events in bursty channels , 1998, IEEE Trans. Commun..