Joint optimization of radio parameters: a top-down approach
Signal Processing - Special section: Advances in signal processing-assisted cross-layer designs
Rate Allocation and Admission Control for Differentiated Services in CDMA Data Networks
IEEE Transactions on Mobile Computing
Impact of orthogonality factor on umts capacity simulation
Proceedings of the 2nd ACM workshop on Performance monitoring and measurement of heterogeneous wireless and wired networks
Analytical Model of the Soft Handoff Mechanism in the UMTS Network
EPEW '09 Proceedings of the 6th European Performance Engineering Workshop on Computer Performance Engineering
Theoretical analysis of the orthogonality factor in WCDMA downlinks
IEEE Transactions on Wireless Communications
A generalized RAKE receiver for satellite WCDMA
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
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The presence of multipaths leads to a loss of orthogonality between signals transmitted simultaneously on a wideband code-division multiple access (WCDMA) downlink. We derive general analytical expressions for the orthogonality factor (OF), which quantifies this loss of orthogonality, as a function of the instantaneous multipath fade realization of the channel. We show that the OF exhibits a significant temporal variation for the three channel profiles suggested in the WCDMA standard, namely, typical urban and rural areas and hilly terrain, which span a wide range of realistic cases. Moreover, its temporal variations and statistics vary significantly from one channel profile to another. Also, while the pulse shape and the number of RAKE fingers has only a marginal impact on the OF's statistics, the granularity in setting the finger positions has a considerable impact. The results of the work can be directly used for evaluation of the system performance of WCDMA cellular systems.