The best known new feature of UMTS is higher user bit rates: on circuit-switched connections 384 kbps, and on packet-switched connections up to 2 Mbps, can be reached. Higher bit rates naturally facilitate some new services, such as video telephony and quick downloading of data. If there is to be a killer application, it is most likely to be quick access to information and its filtering appropr...

Performance analysis of multi service UMTS networks is of major interest for mobile network providers. Because of the W-CDMA technique used in UMTS, which leeds to an interference limited system with a dynamic cell capacity and load dependent cell coverage, the service mix has a big influence on the system performance. The aim of this paper is to provide a detailed description of the performanc...

Cellular systems, such as UMTS, use scheduling algorithms in order to provide fair sharing of the available bandwidth among the different users. However, the use of scheduling algorithms in wireless networks can have a great impact on the performance of TCP based applications. The objective of the paper is the identification of the effects observed in legacy TCP connections over a UMTS downlink...

This paper focuses on the use of an equalization-based receiver for WCDMA (Wideband Code-Division Multiple Access) in an inter-cellular environment, for handover studies. The receiver is based on the MMSE (Minimum Mean Square Error) algorithm and uses the UMTS (Universal Mobile Telecommunications System) HSDPA (High Speed Downlink Packet Access) standard as a basis, alongside the reference UMTS...

The energy consumption of cellular networks has become increasingly important to cellular network operators, due to the significant economic and ecological influence of these networks in the future. The development of alternative energy technologies has resulted in the consideration of a solar powered base station (BS) as a long-term solution for the mobile cellular network industry, to reduce ...

As an example of a systematic procedure for evaluating UMTS downlink DSP functions for adaptivity we study bit-error-rate performance tradeoffs between the spreading factor, the symbol constellation size and the number of used Rake fingers in UMTS despreading and demodulation. After an overview of the DSP functions that are used in UMTS downlink transmission and reception we present a usage sce...

The International Telecommunications Union (ITU) has endorsed High Altitude Platforms (HAPs) as an alternative means of providing UMTS wireless services. The utilisation of HAPs (High Altitude Platforms) in the access part of the upcoming UMTS networks can provide great flexibility to UMTS from the viewpoint of service provisions and fast infrastructure installation. Moreover, they offer these ...

A simple and computationally inexpensive analytical approach to the evaluation of the short-term fading depth dependence on system bandwidth and environment characteristics is proposed. The approach, accounting for the maximum difference in propagation path length and having the Rice factor as a parameter, is derived from fitting simulated data from a model in the literature. Application exampl...

Universal mobile telecommunication system (UMTS) is a third-generation mobile communications system that supports wireless wideband multimedia applications. The primary aim of this study is to present learning models based on neural networks for objective, non-intrusive prediction of video quality over wireless local area network (WLAN) and UMTS networks for video applications. The contribution...