بررسي روش هاي گزينش رله در مخابرات همكارانه بي سيم

چكيده انگليسي :

93 Performance Evaluation of Relay Selection Methods in Wireless Cooperative Communication Mina Motahari m motahari@ec iut ac ir Date of Submission 2014 01 19 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mohammad Sadegh Fazel fazel@cc iut ac ir Advisor Mohammad Javad Omidi omidi@cc iut ac ir Abstract It is highly expected that the new generation of wireless communication systems offer much higher rate for voice data and video services In order to cope with increased worldwide demand for these services communication systems with higher data rates along with high reliability and user capacity are required To overcome proposed MIMO system problems such as system complexity and financial issues a new kind of diversity called cooperative diversity has been proposed In cooperative relay networks intermediate nodes defined as relay nodes help a source to deliver its information to a destination Using more than one available relay nodes in cooperative relay network instead of only one relay node can cause some problems such as increasing system complexity increasing the required bandwidth or the need for accurate synchronization of symbols In contrast opportunistic relaying or selecting one appropriate relay node from all active relay nodes can reduce energy consumption and increase data rates in addition to the previous general cooperative relaying benefits such as improving communication quality and coverage In this thesis the latest methods of relay selection or opportunistic relaying are classified and investigated The overall performances of these methods are compared together from various aspects Based on our provided comparison result depending on the relay network channel condition underlying wireless network application and applied optimization criterion one of the investigated methods can be applied in the design of a relay network In addition a new method for relay selection in cooperative relaying networks is proposed and its performance is compared with the previous relay selection methods such as maximum Minimum maximum harmonic mean the best source relay channel and the best relay destination channel Simulation results in this thesis shows that the outage probability and the average symbol error rate of theproposed method is less than the best source relay channel and the best relay destination channel methods and the average network throughput of the proposed method is better than those two methods Although the performance of the proposed method in terms of outage probability average throughput and average symbol error rate is very near to the performance of maximum minimum and maximum harmonic mean methods its computation time and computational complexity for relay selection is less than the other two selection methods As a result using new method the energy consumption of the entire network is reduced Keywords Relay Selection Cooperative Relaying Amplify and Forward Decode and ForwardPDF created with pdfFactory Pro trial version www pdffactory com

مطهري، مينا

بررسي روش هاي گزينش رله در مخابرات همكارانه بي سيم

رله اي همكارانه , پروتكل تقويت و ارسال , پروتكل كد گشايي و ارسال