Groupwise Multiuser Detection in a Multirate DS-CDMA System

This report presents the performance of groupwise successive interference cancellation (GSIC) within a direct sequence code division multiple access system (DS-CDMA). Within the groups, matched filter and PIC receivers are used for detection of the users. A multirate DS-CDMA system model, based on a single rate system is presented. Although the...

Performance Analysis of Multiuser Detection for Synchronous and Asynchronous Multirate DS-CDMA System

This thesis presents mainly the impact of the timing error on a synchronous and on an asynchronous multirate Direct-Sequence (DS) Code Division Multiple Access (CDMA) system based on variable spreading code technique using multistage parallel interference cancellation (PIC) detection. The performances of the multi-code (MC) access system with...

Decision Feedback Channel Estimation in a Wideband CDMA Receiver

In this thesis the channel estimation in an uplink WCDMA chain has been examined. The objective was to compare the performance of different methods for estimating the channel. The research was in accordance with the current research on third generation mobile systems in Europe. The specifications of the multiple access scheme defined by ETSI...

Performance evaluation of multi-user detectors for DS-CDMA systems over multi-path Rayleigh fading channels with AWGN

The third generation of the mobile communications network is the Universal Mobile Telecommunications System (UMTS). One of the multiple access techniques will be Direct Sequence Code Division Multiple Access (DS-CDMA). This report evaluates the performance of different detectors for DS-CDMA systems for the specifications of the UMTS environment...

Detection strategies and cancellation schemes in a MC-CDMA system

In this report we analyse different possibilities to reduce multi-user interference in a MCCDMA system. First a quasi-synchronous uplink channel has been proposed with a relative synchronisation algorithm; secondly different diversity combining techniques have been simulated and evaluated in an uplink and downlink channel; finally comparing the...

The effect of delay in measurement on the performance of isolated DCA algorithms using DECT system

Dynamic Channel Assignment is an algorithm for assigning channels in a mobile wireless environment. In a system based on isolated Dynamic Channel Assignment, the base stations (Radio Fixed Parts or RFPs) operate total independently. The mobiles (Portable Parts or PPs) have the most responsibility for call set-ups and handovers. Portable Parts...

Effect of Pulse Shaping on the Performance of DS-CDMA in a Multipath Fading Channel

This report gives first an overview of the main modulation methods and of the multipath propagation effects. A model is described to simulate BPSK, QPSK and OK-QPSK in some measured indoor channels. Several pulse shapes are analysed and their effects discussed on single-user systems and on DS-CDMA. The main performance parameter is the bit error...

Performance evaluation of a successive interference cancellation scheme in a Quasi-Synchronous MC-CDMA system

This report describes a performance evaluation of a successive interference cancellation scheme in a Quasi-Synchronous MC-CDMA system. It provides a clear description of a relatively new spread spectrum concept called multi carrier CDMA or MC-CDMA. This modulation technique can be seen as an evolution of normal DS-CDMA. Another issue in this...