多载波无线携能通信的上下行链路联合资源分配
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摘要
研究了由基站和用户组成的多载波无线携能通信系统,其上行链路和下行链路均采用正交频分复用技术。在下行链路中,基站同时向用户完成信息和能量的传输;在上行链路中,用户利用从基站接收的能量向基站回传信息。以最大化上下行链路加权和速率为目标,联合优化上下行链路的子载波分配和功率分配,提出了基于拉格朗日对偶法和椭球法的最优子载波与功率联合分配算法。实验仿真验证了所提算法的有效性。
A multi-carrier simultaneous wireless information and power transfer(SWIPT) communication system including one base station(BS) and one user was investigated, where both uplink and downlink adopt orthogonal frequency division multiplexing(OFDM). In the downlink, the BS transmited information and power to the user simultaneously. In the uplink, the user transmited information to the BS by using the power harvested from the BS in the downlink. The weighted sum of the downlink and uplink achievable rates by jointly optimizing subcarrier allocation and power allocation of the uplink and downlink were aimed to maximized. An optimal algorithm to solve the joint resource allocation problem was proposed, which was based on the Lagrange duality method and the ellipsoid method. Finally, the result shows the performances of the proposed algorithm by computer simulations.
A multi-carrier simultaneous wireless information and power transfer(SWIPT) communication system including one base station(BS) and one user was investigated, where both uplink and downlink adopt orthogonal frequency division multiplexing(OFDM). In the downlink, the BS transmited information and power to the user simultaneously. In the uplink, the user transmited information to the BS by using the power harvested from the BS in the downlink. The weighted sum of the downlink and uplink achievable rates by jointly optimizing subcarrier allocation and power allocation of the uplink and downlink were aimed to maximized. An optimal algorithm to solve the joint resource allocation problem was proposed, which was based on the Lagrange duality method and the ellipsoid method. Finally, the result shows the performances of the proposed algorithm by computer simulations.
引文
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[2]VARSHNEY L R.Transporting information and energy simultaneously[C]//IEEE International Symposium on Information Theory.IEEE,2008:1612-1616.
[3]LIU Y,WANG X.Information and energy cooperation in OFDMrelaying:protocols and optimization[J].IEEE Transactions on Vehicular Technology,2016,65(7):5088-5098.
[4]LIU L,ZHANG R,CHUA K C.Wireless information transfer with opportunistic energy harvesting[J].IEEE Transactions on Wireless Communications,2012,12(1):288-300.
[5]ZHAO F,WEI L,CHEN H.Optimal time allocation for wireless information and power transfer in wireless powered communication systems[J].IEEE Transactions on Vehicular Technology,2016,65(3):1830-1835.
[6]LIU L,ZHANG R,HO C K.Wireless information and power transfer:a dynamic power splitting approach[J].IEEE Transactions on Communications,2013,61(9):3990-4001.
[7]ZHOU X,ZHANG R,HO C K.Wireless information and power transfer:architecture design and rate-energy tradeoff[J].IEEE Transactions on Wireless Communications,2013,61(11):4754-4767.
[8]JU H,ZHANG R.A novel mode switching scheme utilizing random beamforming for opportunistic energy harvesting[C]//IEEE Wireless Communications and Networking Conference.IEEE 2013:4250-4255.
[9]ZHANG G C,XU J,WU Q Q,et al.Wireless powered cooperative jamming for secure OFDM system[J].IEEE Transactions on Vehicular Technology,2018,67(2):1331-1346.
[10]ZHANG G C,LI X Y,CUI M,et al.Signal and artificial noise beamforming for secure simultaneous wireless information and power transfer multiple-input multiple-output relaying systems[J].IETCommunications,2016,10(7):796-804.
[11]HUANG K B,LARSSON E.Simultaneous information and power transfer for broadband wireless systems[J].IEEE Transactions Signal Processing,2013,61(23):5972-5986.
[12]ZHOU X,ZHANG R,HO C K.Wireless information and power transfer in multiuser OFDM systems[J].IEEE Transactions on Wireless Communications,2014,13(4):2282-2294.
[13]LI X Y,ZHANG Q,ZHANG G C,et al.Joint resource allocation with subcarrier pairing in cooperative OFDM DF multi-relay networks[J].IET Communications,2015,9(1):78-87.
[14]CHENG W,GHOGHO M,HUANG Q,et al.Maximizing the sum-rate of amplifyandforwardtwo-way relaying networks[J].IEEE Signal Processing Letters,2011,18(11):635-638.
[15]LI X Y,ZHANG Q,ZHANG G C,et al.Joint source and relays power allocation for MIMO AF multi-relay networks[J].Wireless Personal Communications,2015,83(3):1915-1926.
[16]KIM H J,LEE H,AHN M.Joint subcarrier and power allocation method in wireless powered communication networks for OFDM systems[J].IEEE Transactions on Wireless Communications,2016,15(7):4745-4753.
[17]LU W D,GONG Y,WU J Y.Simultaneous wireless information and power transfer based on joint subcarrier and power allocation in OFDM systems[J].IEEE Access,2017,5:2763-2770.
[18]YU W,LUI R.Dual methods for nonconvex spectrum optimization of multi-carrier systems[J].IEEE Transactions on Wireless Communications,2006,54(7):1310-1322.
[19]BOYD S,VANDENBERGHE L.Convex optimization[M].Cambridge:Cambridge University Press,2004.
[20]WU Q,CHEN W,NG D,et al.Spectral and energy-efficient wireless powered IoT networks:NOMA or TDMA?[J].IEEE Transactions on Vehicular Technology,2018,67(1):6663-6667.
[21]NA Z,LI X,LIU X,et al.Subcarrier allocation based simultaneous wireless information and power transfer for multiuser OFDM systems[J].EURASIP Journal on Wireless Communications and Networking,2017,2017(1):148.