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
为有效传输多用户多中继网络信息,在线性网络编码的基础上给出一种基于正交处理的网络编码方法(NCOP,network coding based on orthogonal process),该编码方式结合正交低频子载波处理思想,将传输数据正交化,利用处理后数据正交性实时...为有效传输多用户多中继网络信息,在线性网络编码的基础上给出一种基于正交处理的网络编码方法(NCOP,network coding based on orthogonal process),该编码方式结合正交低频子载波处理思想,将传输数据正交化,利用处理后数据正交性实时传输并解码需要用户数据,进一步降低系统中断概率,提高分集增益。理论分析了该编码方法的系统中断概率和平均误码率,分析和仿真结果表明在多用户协作网络的应用中,NCOP中断性能及误码性能均优于线性网络编码。展开更多
Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only ...Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only consider a per-subcarrier relay strategy,which treats each subcarrier as a separate channel,which results in significant sum rate loss,especially in fading environments.In this paper,a joint coding scheme over multiple subcarriers is involved for multipair users in two-way relay systems to obtain multiuser diversity.A generalized subcarrier pairing strategy is proposed to permit each user-pair to occupy different subcarriers during the two transmission phases,i.e.,the multiple access and broadcast phases.Moreover,a low complexity joint resource allocation scheme is proposed to improve the spectrum efficiency with an additional multi-user diversity gain.Some numerical simulations are finally provided to verify the efficacy of our proposal.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。
文摘为有效传输多用户多中继网络信息,在线性网络编码的基础上给出一种基于正交处理的网络编码方法(NCOP,network coding based on orthogonal process),该编码方式结合正交低频子载波处理思想,将传输数据正交化,利用处理后数据正交性实时传输并解码需要用户数据,进一步降低系统中断概率,提高分集增益。理论分析了该编码方法的系统中断概率和平均误码率,分析和仿真结果表明在多用户协作网络的应用中,NCOP中断性能及误码性能均优于线性网络编码。
基金supported by the National Natural Science Foundation of China(NSFC)(No.61501527)State’s Key Project of Research and Development Plan(No.2016YFE0122900-3)+1 种基金the Fundamental Research Funds for the Central Universities,Basic Research Foundation of Science Technology and Innovation Commission of Shenzhen Municipality(No.JCYJ20150630153033410)SYSU-CMU Shunde International Joint Research Institute and 2016 Major Project of Collaborative Innovation in Guangzhou(Research and Application of Ground Satellite Communicaiton Systems for Space Broadband Information Networks)
文摘Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only consider a per-subcarrier relay strategy,which treats each subcarrier as a separate channel,which results in significant sum rate loss,especially in fading environments.In this paper,a joint coding scheme over multiple subcarriers is involved for multipair users in two-way relay systems to obtain multiuser diversity.A generalized subcarrier pairing strategy is proposed to permit each user-pair to occupy different subcarriers during the two transmission phases,i.e.,the multiple access and broadcast phases.Moreover,a low complexity joint resource allocation scheme is proposed to improve the spectrum efficiency with an additional multi-user diversity gain.Some numerical simulations are finally provided to verify the efficacy of our proposal.
