Simultaneous Wireless Information And Power Transfer For Full-duplex System

With the continuous development of wireless communication technologies,the energy constraint in wireless networks has become one of the bottlenecks in the development of wireless communication systems.In order to solve the problem of energy-constrained wireless networks,Simultaneous wireless information and power transfer(SWIPT),as a promising energy harvesting technology,attracted more and more attention.This paper introduces SWIPT into full-duplex system,the combination and feasibility are analyzed.Firstly,this paper introduces the significance of the study in the context of energy shortage,as well as the principle of and key technologies of SWIPT,full-duplex and orthogonal frequency division multiplexing(OFDM).Then,SWIPT based on full-duplex OFDM link is studied.An OFDM link between a base station(BS)and user equipment(UE)is proposed.What's more,a new SWIFT schemes is proposed,which is different from Power splitting(PS)and time switching(TS).On the downlink,a fraction of subcarriers are used for energy harvesting,the remaining ones are used for information decoding;on the uplink,the UE transfers information to the BS using the harvested energy.Different from the traditional full-duplex OFDM system,in order to minimize the system energy consumption to achieve target data rates on the uplink and downlink simultaneously,a joint subcarrier assignment and power allocation problem is formulated.And an efficient algorithm is proposed to solve the problem.Furthermore,we investigate a full-duplex amplify-and-forward(AF)relay networks.All involved nodes,including a relay and two source,which all operate in full-duplex mode.The received signals at relay are partitioned into two parts.A fraction of the received signals are used for information decoding(ID),and the remaining are used for energy harvesting(EH).In order to minimize the system energy consumption to achieve target data rates,a joint subcarrier assignment and power allocation problem is formulated.By using dual decomposition method,an efficient algorithm is proposed to solve the problem.Finally,simulation results show that SWIPT can effectively utilize the advantages of full-duplex technology with the self-interference cancellation techniques.And improve the performance of system with increasing the spectrum utilization.Joint subcarrier assignment and power allocation in OFDM system can effectively combat the frequency selective fading of channels,which can improve the efficiency of energy transmission and reduce the energy consumption of the system.OFDM and relay network,improve the performance of system with increasing the spectrum utilization.In addition,the self-interference of full-duplex relay has little effect on the system rate,and full-duplex can improve the quality of communication effectively.