Noncoherent Equalizer for DECT System

Abstract

Digital European Cordless Telecommunication (DECT), as a standard for cordless indoor wireless communication in Europe, is widely used in hospitals, offices and factories. But its performance can be constrained by channel dispersion, and this can limit the use of DECT system in reflective environments. In this master thesis project, non-coherent equalization schemes are investigated. Different equalization algorithms are simulated in Matlab and a least mean square (LMS) algorithm based baseband equalizer is implemented in a field programmable gate array (FPGA). But this method is proved insufficient to solve the severe multipath fading problem. Another type of equalizer called passband equalizer is stated afterwards, and a required bit error rate (BER) can be achieved in multipath fading channels up to 500 ns delay spread. This project includes both simulation and hardware implementation. In this thesis, simulations of two types of equalization methods (LMS baseband and passband equalizer) and implementation of the LMS baseband equalizer in FPGA are introduced. The challenge of future work and its possible refinement are also analyzed.