AbstractsComputer Science

Wireless relay networks provide extended cell coverage and newlinereduced power consumption In One Way Relay Network OWRN the data newlinetransmission is unidirectional in which source node sends information to relay newlinenode and then the relay node sends it to destination nodes Unlike OWRN in newlinebidirectional relay network two source nodes exchange their information newlinethrough a relay node and thereby doubling the data rate Network coding is a newlinepotential and powerful tool in designing communication networks It newlinecombines and extracts information through simple Galois field additions and newlinemultiplications Using the concept of network coding at the relay node newlinebidirectional relay network achieves data transfer in three time slots compared newlineto the traditional requirement of four time slots Later it is proved that newlinePhysical Layer Network Coding PLNC at relay requires only two slots to newlineexchange information As practical wireless communications experience the newlinescattered and delayed propagation paths Orthogonal Frequency Division newlineMultiplexing OFDM is used to overcome the effect of frequency selective newlineFading The concept PLNC is combined with OFDM to enhance the newlinethroughput of a bidirectional relay network over frequency selective fading newlinechannel However the presence of Radio Frequency RF impairments newlinenamely In phase and Quadrature I Q imbalance and phase noise severely newlineaffect the performance of OFDM based bidirectional relay network newline newline%%%reference p140-146.