基于能量收集的多对双向MIMO AF中继系统的和速率分析
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摘要
采用基于中继功率分配的能量收集方法,中继将接收到的部分射频信号转化为能量并利用收集到的能量放大和转发剩下的信号,通过在中继使用最大比合并/最大比传送的接收和预编码技术,推导出每个用户的遍历速率的下界表达式,然后研究了使所有用户和速率最大的最佳中继功率分配比.仿真结果说明了在最佳中继功率分配比的条件下可以得到最大的和速率,同时给出了和速率与中继天线数和用户对数的关系,并表明了在用户总功率一定的条件下,能量收集中继系统的性能优于传统的没有能量收集的中继系统.
An energy harvesting method based on power splitting-based relay is adopted,where the relay converts part of the received radio frequency signals into energy and amplifies and forwards the remaining signal using the collected energy.By using maximum-ratio combining/maximum-radio transmission receiving and precoding technology at the relay node,the corresponding lower bound expressions for the ergodic rate of each user are derived and the optimal relay power allocation ratio which maximizes the sum rate of all users is calculated.The simulation results show that the maximum sum rate can be obtained under the optimal relay power allocation ratio,and the relationship between the sum rate with the number of relay antennas and the number of users is given.What's more,the performance of the relay system based on energy harvesting outperforms that without energy harvesting.
An energy harvesting method based on power splitting-based relay is adopted,where the relay converts part of the received radio frequency signals into energy and amplifies and forwards the remaining signal using the collected energy.By using maximum-ratio combining/maximum-radio transmission receiving and precoding technology at the relay node,the corresponding lower bound expressions for the ergodic rate of each user are derived and the optimal relay power allocation ratio which maximizes the sum rate of all users is calculated.The simulation results show that the maximum sum rate can be obtained under the optimal relay power allocation ratio,and the relationship between the sum rate with the number of relay antennas and the number of users is given.What's more,the performance of the relay system based on energy harvesting outperforms that without energy harvesting.
引文
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[3] Silva S,Amarasuriya G,Tellambura C,et al.Relay selection strategies for MIMO two-way relay networks with spatial multiplexing[J].IEEE Transactions on Communications,2015,63(12):4694-4710.
[4] Chen X,Lei L,Zhang H,et al.Large scale MIMO relaying techniques for physical layer security:AF or DF?[J].IEEE Transactions on Wireless Communications,2015,14(9):5135-5146.
[5] Amarasuriya G,Tellambura C,Ardakani M.Sum rate analysis of two-way MIMO AF relay networks with zero forcing[J].IEEE Transactions on Wireless Communications,2013,12(9):4456-4469.
[6] Ngo H Q,Larsson E G.Large scale multipair two-way relay networks with distributed AF beamforming[J].IEEE Communications Letters,2013,17(12):1-4.
[7] Wang J,Yu H,Wu Y P,et al.Pilot optimization and power allocation for OFDM based full duplex relay networks with IQ imbalances[J].IEEE Access,2017,5:24344-24352.
[8] Suraweera H A,Ngo H Q,Duong T Q,et al.Multi-pair amplify and forward relaying with very large antenna arrays[A].IEEE International Conferenceon Communications[C].Buda-pest,Hungary:IEEE,2013.4635-4640.
[9] Cui H Y,Song L Y,Jiao B L.Multi-pair two-way amplify and forward relaying with very large number of relay antennas[J].IEEE Transactions on Wireless Communications,2014,13(5):2636-2645.
[10] Liu M M,Zhang J H,Zhang P.Multipair two-way relay networks with very large antenna arrays[A].IEEE 80th Vehicular Technology Conference[C].Vancouver,Canada:IEEE,2014.1-5.
[11] Jin S,Liang X S,Wong K K,et al.Ergodic rate analysis for multipair massive MIMO two-way relay networks[J].IEEE Transactions on Wireless Communications,2015,14(3):1480-1491.
[12] Dai Y Y,Dong X D.Power allocation for multi-pair massive MIMO two-way AF relaying with linear processing[J].IEEE Transactions on Wireless Communications,2016,15(9):5932-5946.
[13] Shu F,Lu Y Z,Chen Y,et al.High-sum-rate beamformers for multi-pair two-way relay networks with amplify and forward relaying strategy[J].Science China Information Sciences,2014,57(2),1-11.
[14] Zhang R,Ho C K.MIMO broadcasting for simultaneous wireless information and power transfer[J].IEEE Transactions on Wireless Communications,2013,12(5):1989-2001.
[15] Medepally B,Mehta N B.Voluntary energy harvesting relays and selection in cooperative wireless networks[J].IEEE Transactions on Wireless Communications,2010,9(11):3543-3553.
[16] Xu J,Zhang R.Throughput optimal policies for energy harvesting wireless transmitters with nonideal circuit power[J].IEEE Journal on Selected Areas in Communications,2014,32(2):322-332.
[17] Ho C K,Zhang R.Optimal energy allocation for wireless communications with energy harvesting constraints[J].IEEE Transactions on Signal Processing,2012,60(9):4808-4818.
[18] Luo S,Zhang R,Lim T J.Optimal save then transmit protocol for energy harvesting wireless transmiters[J].IEEE Transactions on Wireless Communications,2013,12(3):1196-1207.
[19] Varshney L R.Transporting information and energy simultaneously[A].IEEE International Symposium on Information Theory[C].Toronto,Canada:IEEE,2008.1612-1616.
[20] Nasir A A,Zhou X,Durrani S,et al.Relaying protocols for wireless energy harvesting and information processing[J].IEEE Transactions on Wireless Communications,2013,12(7):3622-3636.
[21] Men J J,Ge J H,Zhang C S,et al.Joint optimal power allocation and relay selection scheme in energy harvesting asymmetric two-way relaying system[J].IET Communications,2015,9(11):1421-1426.
[22] 丁长文,杨霖,李高祥.能量收集双向中继网络的高能效联合中继选择和功率分配算法[J].电子学报,2017,45(5):1124-1129.DING Chang-wan,YANG Lin,LI Gao-xiang.Energy efficient relay selection and power allocation for energy harvesting two-way relay network[J].Acta Electronica Sinica,2017,45(5):1124-1129.(in Chinese)
[23] Yin S X,Qu Z W,Zhang L L.Wireless information and power transfer in cooperative communications with power splitting[A].IEEE Global Communications Conference[C].San Diego,USA:IEEE,2015.1-6.
[24] Liu Y,Wang X.Information and energy cooperation in OFDM relaying:protocals and optimization[J].IEEE Transactions on Vehicular Technology,2016,65(7):5088-5098.
[25] Salem A,Hamdi K A.Wireless power transfer in multipair two-way AF relaying networks[J].IEEE Transactions on Communications,2016,64(11):4578-4591.
[26] Wang X H,Liu J,Zhai C.Wireless power transfer based multipair two-way relaying with massive antennas[J].IEEE Transactions on Wireless Communiations,2017,16(11):7672-7684.
[27] Liang Y C,Zhang R.Optimal analogue relaying with multiantennas for physical layer network coding[A].IEEE International Conference on Communications[C].Beijing,China:IEEE,2008.3893-3897.