Electronic and Communication - Engineering

Abstract: Performance and flexibility of mobile radio systems essentially depend on the choice of the multiple access scheme. The novel Multicarrier Code Division Multiple Access (MC-CDMA) scheme which is the topic of this thesis is a promising alternative to conventional FDMA, TDMA, and CDMA schemes. With MC-CDMA, each data modulated chip of the user specific spreading code is mapped onto a separate subcarrier, so that the chips of the spreading code and, hence, the data symbol is transmitted in parallel on multiple subcarriers which introduces frequency diversity.

Abstract: Exponential growth of mobile communications, radio links and wireless networks has increased interest in many topics in radio propagation. Much effort is now devoted to refine radio propagation path-loss models for urban, suburban, and other environments together with substantiation by field data. The objective for the system designer is to provide sufficient clearance of the obstacle without appreciable transmission loss due to the obstacle. The degree of intersection between the obstacle and the first Fresnel zone gives a good measure of obstruction loss.

Abstract: In an attempt to keep flexibility of a programmable solution and the efficiency of dedicated solution, Field Programmable Gate Arrays (FPGAs) are beginning to emerge as a viable option. In this view, FPGAs are an attractive option for implementing digital communication systems for reasons of performance, power consumption, and reconfigurability. This work examines techniques for developing, modeling and generating FPGA implementation of QPSK modem. Amongst the more complex and demanding tasks performed in high data rate wireless communication system is synchronization.