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Optimization of SHO margin in WCDMA network

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3 Author(s)
Tamilselvan, S. ; Dept. of Electron. & Commun. Eng., Pondicherry Eng. Coll., Pondicherry ; Thyagarajeswara Naidu, N. ; Manivannan, K.

The focus of the paper is to analyze the downlink performance of a wideband code division multiple access (WCDMA) system with site selection diversity transmission (SSDT) power control during soft handover (SHO) mode and to find the optimum SHO margin (MSH) in terms of maximum system capacity under energy-per-bit to noisespectral density ratio (Eb/No) quality requirements. Analyzing the dependency of the connection probabilities, percentage of users connected to one, two, or three Base Stations (BSs) simultaneously as a function of the MSH. Analyzed the system capacity and required resources dependency on MSH for voice service and combined multimedia mobile services. System capacity dependency on MSH is analyzed, by considering two types of user distributions, namely 1) uniform user distribution and 2) a concentration of all the users in the location that requires maximum transmitted power (the worst case). The result of this analysis shows an increase in user capacity of about 16% - 20% for the optimum MSH of 5-5.5dB. Nevertheless, the resources required (number of scrambling codes) by the base station increases faster than the number of active users in terms of MSH.

Published in:

India Conference, 2008. INDICON 2008. Annual IEEE  (Volume:2 )

Date of Conference:

11-13 Dec. 2008

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