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A Novel Dynamic Stepsize Power Control Algorithm for UMTS W-CDMA Systems

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2 Author(s)
Gang Luo ; Department of Electrical and Computer Engineering, Ryerson University, Toronto, ON, Canada, M5B 2K3. g2luo@ryerson.ca ; Lian Zhao

Power control is an essential mechanism for wideband code division multiple access (W-CDMA) systems. In our earlier work, a combined power control and a greedy rate packing (GRP) allocation scheme employing conventional fixed stepsize power control (FSPC) is discussed and evaluated. In this paper, we extend the algorithm to apply a novel dynamic stepsize power control (DSPC) algorithm to improve system performance. The dynamic stepsize (DS) is determined by the difference between the target SIR* and the received SIR. A larger stepsize is applied when the difference between the received SIR and the target SIR* is large to enhance tracking ability, and vice versa to reduce granular noise. Simulation results show the effectiveness of the proposed DSPC algorithm, with around 2% gain of throughput, 6.5% average power consumption saving and 0.5 dB standard deviation (STD) reduction of the received SIR, when compared with the FSPC scheme

Published in:

2006 6th International Conference on ITS Telecommunications

Date of Conference:

June 2006