OFDM协作网络中基于组合叠加导频的信道估计技术

发布时间：2018-02-03 06:57

本文关键词： 放大转发信道估计叠加训练　出处：《系统工程与电子技术》2017年11期 　论文类型：期刊论文

【摘要】：针对三节点放大转发(amplify-and-forward,AF)的正交频分复用(orthogonal frequency division multiplexing,OFDM)协作中继网络,为了高效获取级联和单跳链路信道状态信息(channel state information,CSI),本文提出基于组合叠加导频的信道估计方案。新方案在源节点和中继节点分别将不同的导频叠加到发送数据上,目的节点利用源导频和中继导频分别完成级联(S→R→D)信道和单跳(R→D)信道的估计。为了消除叠加导频方案中信息符号对于各链路信道估计造成的严重干扰,源导频设计采用发端预处理的数据置零叠加导频(data nulling superimposed pilots,DNSP)方式,并提出了基于协作干扰消除(cooperative interference cancelation,CIC)的中继导频设计方案,新方案一方面借助直达(S→D)链路检测符号来消除中继数据对R→D信道估计的影响,另一方面利用迭代重构来弥补源节点数据失真和提高检测性能。仿真结果表明,新方案在避免训练导频占用带宽开销的同时能获得与传统频分复用(frequency division multiplexing,FDM)导频相近的性能。
[Abstract]:Amplify-and-forward for three-node amplification and forwarding. AF) orthogonal Frequency Division Multiplexing (OFDM) orthogonal frequency division Multiplexing (OFDM) cooperative relay network. To efficiently obtain channel state information for cascaded and single-hop links. In this paper, a channel estimation scheme based on combined superposition pilot is proposed, in which the source node and the relay node superimpose different pilots on the transmitted data respectively. The destination node uses the source pilot and the relay pilot to complete the cascade S respectively. 鈫扲. 鈫扗) Channel and single hop R. 鈫扞n order to eliminate the serious interference caused by the information symbol to the channel estimation of each link in the superposition pilot scheme. The design of source pilot is based on data nulling superimposed pilots-DNSPs. The design scheme of relay pilot based on cooperative interference cancellation (interference) is also presented. On the one hand, the new scheme relies on direct access to S. 鈫扗2) link detection symbol to eliminate relay data pair R. 鈫扥n the other hand, iterative reconstruction is used to compensate the source node data distortion and improve the detection performance. The simulation results show that. The new scheme can obtain frequency division multiplexing with traditional frequency division multiplexing while avoiding bandwidth overhead of training pilot. FDM) similar pilot performance.
【作者单位】：海军工程大学电子工程学院;
【基金】：国家自然科学基金(61302099) 湖北省自然科学基金(2015CFB174) 中国博士后基金面上项目(2014M562554) 中国博士后特别资助基金(2015T81107)资助课题
【分类号】：TN929.53
【正文快照】： 网络优先出版地址:http://kns.cnki.net/kcms/detail/11.2422.TN.20170622.1136.008.html0引言协作通信技术可以看作是传统多输入多输出(multipleinput multiple output,MIMO)技术在分布式以及多跳传输环境中的拓展,通过将分布在空间不同位置的用户节点作为中继,充分利用潜在

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