The outage probability in DS/CDMA for cellular mobile radio with imperfect power control

We establish a system model, including shadowing, multipath fading, antenna diversity and voice active factor, to estimate the system performance with considerations of perfect and imperfect power control by using the outage probability. Based on our calculations, it is shown that the system performance is sensitive to multipath fading, antenna diversity, and the power-control error. From our simulation results, three schemes are derived as follows: (1) the average power control is not powerful enough to maintain a minimum required number of subscribers per cell in a fading environment or in imperfect conditions; (2) antenna diversity can be used to improve the system capacity in all conditions, not only considerations with perfect power control, but also with imperfect power control; and (3) the system capacity is decreased rapidly by multipath fading and the power-control error.