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

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2 Author(s)
Duk Kyung Kim ; SK Telecom R&D Center, Kyunggi, South Korea ; Dan Keun Sung

Capacity estimation in code division multiple access (CDMA) systems is an important issue which is closely related to power control. Many previous studies 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-interference ratio (SIR)-based power control systems, which maintain the received SIR at a desired level, the power level is a function of the above two variables. This study derives the reverse link capacity of an SIR-based power control system supporting ON-OFF traffic in a multiple cell environment. Two different power control systems are compared in terms of capacity in both CBR and ON-OFF traffic environments. The effects of activity factor, the required Eb/Io, the maximum received power, and propagation parameters are also investigated

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Vehicular Technology, IEEE Transactions on  (Volume:49 ,  Issue: 4 )