Capacity estimation for an SIR-based power-controlled CDMA system supporting ON-OFF traffic

Capacity estimation in code division multiple access (CDMA) systems is an i mportant issue which is closely related to pou er control. Many previous st udies assumed strength-based power control, which maintains received power at a desired level regardless of changes in the number of active users and in the amount of total other cell interference. However, in signal-to-inter ference ratio (SIR)-based power control systems, which maintain the receive d SIR at a desired level, the power level is a function of the above two va riables. This study derives the reverse link capacity of an SIR-based power control system supporting ON-OFF traffic in a multiple cell environment: T wo different power control systems are compared in terms of capacity in bot h CBR and OS-OFF traffic environments. The effects of activity factor, the required E-b/I-o, the maximum received power, and propagation parameters ar e also investigated.