Performance analysis of dual hop cellular networks

Explosive growth in wireless technology caused by development in digital and RF circuit fabrications put some serious challenges on wireless system designers and link budget planning. Low transmit power, system coverage and capacity, high data rates, spatial diversity and quality of services (QOS) are the key factors in future wireless communication system that made it attractive. Dual-hop relaying is the promising underlying technique for future wireless communication to address such dilemmas. Based on dual-hop relaying this thesis addresses two scenarios. In the first case the system model employs dual-hop amplify and forward (AF) multiple input multiple output (MIMO) relay channels with transmit and receive antenna selection over independent Rayleigh fading channels where source and destination contain multiple antennas and communicate with each other with help of single antenna relay. It is assumed that the source and destination has perfect knowledge of channel state information (CSI). Our analysis shows that full spatial diversity order can be achieved with minimum number of antennas at source and destination i.e.. In the second case the performance analysis of dual-hop amplify and forward (AF) multiple relay cooperative diversity network with best relay selection schemes over Rayleigh fading channels is investigated where the source and destination communicate with each other through direct and indirect links. Only the performance of best relay is investigated which participates in the transmission alone. The relay node that achieves highest SNR at the destination is selected as a best relay. Once again our analysis shows that full diversity order can be achieved with single relay with fewer resources compare to the regular cooperative diversity system. iv Acknowledgment First of all we would like to express our deep gratitude to our beloved thesis supervisor Mr. Jörgen Nordberg for his encouragement and priceless advices, who supports us in the right time and assigned us a right direction. His constructive instruction made us possible to finish our task. We express our profound gratitude to Blekinge institute of technology (BTH) who awarded us with such a great opportunity to pursue our higher education in a technological challenging atmosphere. We are also thankful to our parents and BTH staff whose support has been instrumental in our studies and building our career. Last but surely not the least; we are thankful to our senior Ahsan Haroon for his moral support and kind concern.