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| Information rate and system capacity of wcdma systems under non-ideal power control |
| Zhang Yan; Yan Hongsen; Zhu Shihua |
| School of Electron and Info. Eng., Xi' an Jiaotong University Xi 'an 710049 China |
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Abstract Starting from the sufficient and necessary condition of existence of solution for power assignment in a single cell WCDMA (Wideband Code Division Multiple Access) system, this paper obtains the system capacity under non-ideal power control through modeling the target SIR(Signal to Interference Ratio) with a log-normal random variable. This provides a criterion for determining the trade-off between the information rate of VBR(Variable Bit Rate) traffic and the capacities of CBR(Constant Bit Rate) and VBR. traffics in mobile communica-tions, Analysis and numerical results show that the system performance is notably declined by non-idea power control, and that the information rate and system capacity are exchangeable. As a result, the system can be adapted to diverse performance requirements for various services by varying the control parameters, then the resource utilization and quality of services of the system can be improved.
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Received: 18 October 2001
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2003, Vol. 25 
