The capacity of Wideband Code Division Multiple Access (WCDMA) technologies in Universal Mobile Telecommunication System (UMTS) relies on efficient power control algorithms. The typical UMTS power control algorithm is based on fixed step size. Therefore, it causes oscillations when the radio channel is unchanged. Furthermore, it lacks abilities to cope with rapid variations in fast fading chann...

The equalization problem is a problem of estimating a signal transmitted over a telecommunication channel. This problem has a range of applications in telecommunications. In this paper, we consider a version of the problem in which the channel model contains an uncertainty. Our goal is to design a robust finite impulse response (FIR) equalizer which guarantees certain bound on the worst-case es...

Various digital modulation techniques have been extensively studied and have found numerous applications in wireless communication systems. One example of this success is the QPSK modulation used in the third generation Universal Mobile Telecommunication System (UMTS). This paper presents a new modulation method that produces less adjacent channel interference (ACI) and lower bit error rate (BE...

In this paper Multiple Input Multiple Output (MIMO) techniques for Universal Mobile Telecommunication System (UMTS) analysis is presented. To simulate the radio channel the COST 259 directional channel model (DCM) is used for macro and microcell scenarios, as defined by the Third Generation Partnership Project (3GPP). Values of capacity and Bit Error Rate (BER) are obtained for different MIMO c...

The radio channel assignment problem can be cast as a graph coloring problem. Vertices correspond to transmitter locations and their labels (colors) to radio channels. The assignment of frequencies to each transmitter (vertex) must avoid interference which depends on the seperation each pair of vertices has. Two levels of interference are assumed in the problem we are concerned. Based on this c...

Low-Earth Orbit (LEO) satellite systems are intended to have an important part of the future generation of mobile telecommunication systems. They aim to provide diierent services to various populations of users. Each class of users requires a certain Quality of Service (QoS) and thus a given part of the shared channel resource. In this paper, LEO satellite systems based on an earth-xed cell con...