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Institute of Electrical and Electronics Engineers (IEEE)
Doi
Abstract
This work analyzes the downlink performance of a WCDMA system with
site selection diversity transmission power control (SSDT) during soft handover mode. Signal to
interference ratio (SIR) power control techniques are modeled and used in the simulations of this
analysis. The study is focused on finding the optimum soft handover margin in terms of
maximum system capacity under energy-per-bit to noise spectral density ratio (Eb/N0) quality
requirements. The results of this analysis show an increase in user capacity of about 15 -20 % for
optimum soft handover margins of 5 – 5.5 dB. Nevertheless, the resources required (number of
scrambling codes) by base station increase faster than the number of active users in terms of soft
handover margin up to soft handover margin values of approximately 9.5 dB.Reig, J. (2006). Capacity Analysis in Downlink WCDMA Systems Using Soft Handover Techniques With SIR-Based Power Control and Site Selection Diversity Transmission. IEEE Transactions on Vehicular Technology. 55(4):1362-1372. doi:10.1109/TVT.2006.8777051362137255
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