该文对基于非实时信道状态信息(Channel State Information,CSI)的多用户放大转发(Amplify-and-Forward,AF)协作通信系统的性能进行分析。系统采用一点对多点的通信系统模型,中继节点根据过时的CSI选择用户。通过推导得出中断概率、信...该文对基于非实时信道状态信息(Channel State Information,CSI)的多用户放大转发(Amplify-and-Forward,AF)协作通信系统的性能进行分析。系统采用一点对多点的通信系统模型,中继节点根据过时的CSI选择用户。通过推导得出中断概率、信道容量和符号错误概率(Symbol Error Rate,SER)的近似表达式。理论分析适用于链路同分布或者非同分布。仿真结果验证理论的正确性,并说明了各种参数对系统性能的影响。同时指出,增加用户数并不能提高系统性能,性能的提高可以通过改变中继的位置来实现。展开更多
The performances of selection cooperation are investigated over asymmetric fading channels where the source-relay and the relay-destination channels experience Nakagami-m and Rayleigh fading,respectively.Decode-and-fo...The performances of selection cooperation are investigated over asymmetric fading channels where the source-relay and the relay-destination channels experience Nakagami-m and Rayleigh fading,respectively.Decode-and-forward(DF)protocol is adopted and the Nth best relay is selected from M available relays.Probability density function(PDF)for the instantaneous signal-to-noise ratio(SNR)at the destination is derived first.Then,it is used to derive the exact expressions for outage probability and average symbol error rate(SER).The results hold for arbitrary M or N.Finally,simulations are carried out to verify the correctness of our theoretical analysis and results show that M and N almost have the same effect on the performance of outage probability and SER.展开更多
A cooperative full-duplex(FD)non-orthogonal multiple access(NOMA)network is consid-ered,in which a source communicate with multiple users via multiple energy harvesting(EH)FD relays.Based on this structure,a novel rel...A cooperative full-duplex(FD)non-orthogonal multiple access(NOMA)network is consid-ered,in which a source communicate with multiple users via multiple energy harvesting(EH)FD relays.Based on this structure,a novel relay selection scheme is proposed over Nakagamim fading channels by considering both the channel state information(CSI)and the energy statuses of relays.A finite Markov chain is adopted to capture the evolution of relay batteries and simplify the performance analysis by making some reasonable assumptions.General closed-form expressions of the outage probability and the ergodic sumrate are derived.All the theoretical results are validated by Monte-Carlo simulations.The impacts of various system parameters,such as the number of relays,the self-interference(SI)at the involved relay and battery size,on the performance are extensively investi-gated.It is shown that the usage of NOMA with FD relaying outperforms the half-duplex(HD)-NO-MA and conventional orthogonal multiple access(OMA)network when the self-interference is not too large.展开更多
文摘该文对基于非实时信道状态信息(Channel State Information,CSI)的多用户放大转发(Amplify-and-Forward,AF)协作通信系统的性能进行分析。系统采用一点对多点的通信系统模型,中继节点根据过时的CSI选择用户。通过推导得出中断概率、信道容量和符号错误概率(Symbol Error Rate,SER)的近似表达式。理论分析适用于链路同分布或者非同分布。仿真结果验证理论的正确性,并说明了各种参数对系统性能的影响。同时指出,增加用户数并不能提高系统性能,性能的提高可以通过改变中继的位置来实现。
基金Supported by the National Natural Science Foundation of China(No.6087024)the Cultivation Fund of the Key Scientific and Technical Innovation Project(No.708059)+2 种基金Open Found of State Key Laboratory of Integrated Services Networks(No.ISN12-10)Open Research Fund of National Mobile Communications Research Laboratory(No.2012D10)the Natural Science Foundation of Shandong Province(No.ZR2011FM027)
文摘The performances of selection cooperation are investigated over asymmetric fading channels where the source-relay and the relay-destination channels experience Nakagami-m and Rayleigh fading,respectively.Decode-and-forward(DF)protocol is adopted and the Nth best relay is selected from M available relays.Probability density function(PDF)for the instantaneous signal-to-noise ratio(SNR)at the destination is derived first.Then,it is used to derive the exact expressions for outage probability and average symbol error rate(SER).The results hold for arbitrary M or N.Finally,simulations are carried out to verify the correctness of our theoretical analysis and results show that M and N almost have the same effect on the performance of outage probability and SER.
基金the National Natural Science Foundation of China(No.61901245).
文摘A cooperative full-duplex(FD)non-orthogonal multiple access(NOMA)network is consid-ered,in which a source communicate with multiple users via multiple energy harvesting(EH)FD relays.Based on this structure,a novel relay selection scheme is proposed over Nakagamim fading channels by considering both the channel state information(CSI)and the energy statuses of relays.A finite Markov chain is adopted to capture the evolution of relay batteries and simplify the performance analysis by making some reasonable assumptions.General closed-form expressions of the outage probability and the ergodic sumrate are derived.All the theoretical results are validated by Monte-Carlo simulations.The impacts of various system parameters,such as the number of relays,the self-interference(SI)at the involved relay and battery size,on the performance are extensively investi-gated.It is shown that the usage of NOMA with FD relaying outperforms the half-duplex(HD)-NO-MA and conventional orthogonal multiple access(OMA)network when the self-interference is not too large.
