Simultaneous Wireless Information And Power(SWIPT) Under Cooperative Relaying Networks

Energy harvesting(EH)using simultaneous wireless information and power transfer(SWIPT)is an attractive solution in the framework of enhancing the battery lifespan of wireless nodes for entirely reliable communication systems.Robust signal power can increase power transformation.However,it also creates more interference in transmitting information,causing the realization of the SWIPT as a challenging problem.In the first part of this thesis,SWIPT with multi-input-multi-output(MIMO)is considered for two users based on the precoding design.T he source node(SN)will forward the energy and information concurrently towards relaying node(RN)in the first time phase within the SWIPT framework.Then the RN will reassemble the received signal and self-signal based on the decode-and-forward(DF)relay protocol in the second time phase.The target is to increase the EH at the RN under the data rate constraint of the SN and to maximize the data rate and downlink signal-to-interference-plus-noise-ratio(SINR)of the second user under the conditions to satisfy the quality of service(QoS)of the first user.Semidefinite relaxation(SDR)and Chames-cooper transformation techniques are employed to solve the nonconvex optimization problem.To support both the optimization problems CVX is premeditated,which is an efficient tool to solve convex and semidefinite programming(SDP)problems.In the next part,an efficient scheme for RN selection based on optimal power splitting ratio(PSR)in dual hop DF cooperative multiple relaying network is proposed under SWIPT framework.A single antenna multiple intermediate EH RN network between source and destination is considered,where multiple relaying terminals harvest energy from the RF signal transmitted by the BS.A Power splitting(PS)protocol is applied at each EH DF relay in order to portray an R-E tradeoff between the energy used to decode the information signal at the relay and the rest of energy harvested to retransmit the decoded signal to the destination terminal.The aim is to maximize the achievable end to end data rate based on an optimal PSR relay selection scheme and compared with conventional equal PSR relay selection scheme.Moreover,the performance of the relay selection scheme based on optimal PSR is investigated in terms of outage probability over small scale Rayleigh fading channel.