15052

13546

كارشناسي ارشد

مخابرات سيستم

اصفهان : دانشگاه صنعتي اصفهان

1398

سيزده، 72ص.: مصور، جدول، نمودار

مهدي مهدوي

احسان يزديان

محمدصادق فاضل، نغمه سادات مويديان

1398/06/27

كتابنامه

برق

مهندسي برق و كامپيوتر

1398/06/27

2559723

Proposing FD relay selection algorithm with energy harvesting capability forimproving spectral and energy efficiency of cognitive radio networks Amin Bagheri amin bagheri@ec iut ac ir August 2019 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Mehdi Mahdavi m mahdavi@cc iut ac ir Abstract With the wider and growing number of wireless network users in one side the demand of frequency spectrum of thesenetworks has grown increasingly and the challenge is the lack of frequencies in these networks in other hand it has resultedin high energy consumption in wireless networks in order to support the proper service quality Since wireless networkdevices use limited energy capacity buffers they also face the challenge of energy shortages Cognitive Radio CR is anoption for confronting the issue of spectrum limitations for future wireless networks This technology aligns itself withthe radio environment In wireless networks of CR to enhance the performance of systems collaboration between two ormore devices is required In this regard relay technology has been considered for advantages such as diversity decreasingpathloss and reducing the shadowing effect also On commonly used half duplex HD CRs networks transmission andreception can t occur in same time or in same frequency Full Duplex communication FD has capability of sending andreceiving in same time and same frequency The presence of Self Interference SI in FD has been a major obstacle tousing this method over the last few years for wireless radio networks Recent research and studies have shown that largelyeliminating Self Interference Cancelation SIC in FD is possible To cope with the challenge of energy shortage of batteryof wireless nodes different energy harvesting models have recently been presented In this research an FD based relayselection algorithm with energy harvesting capability in cognitive radio network is presented The secondary user selects arelay between several relays This selection is based on the channel conditions and energy harvested and stored in the relaybuffer Relay selection is a very important factor in improving the quality of the radio network service The main objectiveof this algorithm is to increase the frequency efficiency and energy efficiency at the same time As the transmit power ofboth nodes increases the efficiency of the frequency increases and the energy efficiency decreases therefore the optimalsending power for both nodes is calculated Results after the implementation of the algorithm The alghoritm of select of FDrelay with the energy harvesting capability and its comparison with the HD structure showed that the frequency efficiencyin the FD structure is significantly larger than the HD structure although if there is no relay selection the energy efficiencyof the HD structure is higher by selecting the appropriate relay and setting the relay energy buffer capacity The difference

مهدي مهدوي

احسان يزديان

محمدصادق فاضل، نغمه سادات مويديان