双向全双工协作通信中异步协作分布式空时码
发布时间：2018-10-08 20:44
【摘要】：有限频谱资源的限制,迫使我们不得不进一步研究新的通信技术以解决当今移动互联网通信领域面临的问题。未来的无线通信系统需要能够提供更多高速率的多媒体业务和数据业务,而协作通信的目的就是利用网络中的节点资源来帮助有通信需求的节点进行高速、可靠的无线通信。因此协作通信技术有望成为未来通信系统中的关键技术。网络中节点工作模式分为HD模式和FD模式。半双工协作通信空时编码方案可以获得很好的异步协作满分集增益。但随着对频率资源利用率的迫切需求,许多学者和机构想到把半双工协作通信网络空时编码技术应用到全双工中继网络中,因其频谱效率理论上可以提高一倍。但如果直接将这些空时编码方案应用到全双工中继系统中将会面临严重的环路自干扰问题。因此分析如何消除自干扰问题成为研究全双工中继网络的关键点。本论文在单向全双工协作通信空时编码的基础上,提出了一种针对双向全双工协作通信系统的异步分布式空时编码。双向全双工通信网络中各节点采用的是FD模式,且都可以进行双向通信传输,可以大大提高频谱利用率。本文对双向全双工系统各节点环路自干扰进行分析,通过抵消中继节点处的部分环路自干扰,将剩余环路自干扰信号加以利用,做为构造分布式空时码的一部分,设计出了适应于双向全双工系统的异步协作分布式空时自编码。同时针对双向通信固有的特征,采用最优化的功率放大因子准则,使得协作通信系统的整体性能达到最优。并结合仿真分析了终端节点处剩余环路信号对系统性能的影响以及中继节点处剩余环路信号对系统的影响,同时又分析在通信过程中信道状态比较良好的情况下,本论文提出设计的双向全双工异步协作分布式空时码可以获得满分集增益,提高系统的性能和容量。
[Abstract]:Due to the limitation of limited spectrum resources, we have to further study new communication technologies to solve the problems in the field of mobile Internet communication. Future wireless communication systems need to provide more multimedia services and data services with high rates. The purpose of cooperative communication is to use node resources in the network to help nodes with communication needs to carry out high-speed and reliable wireless communication. Therefore, cooperative communication technology is expected to become the key technology in future communication systems. The node working mode in the network is divided into HD mode and FD mode. Half duplex cooperative communication space-time coding scheme can obtain good asynchronous cooperative full diversity gain. However, with the urgent need for the utilization of frequency resources, many scholars and institutions have come up with the idea of applying space-time coding technology to full-duplex relay networks, because its spectral efficiency can be doubled in theory. However, if these space-time coding schemes are directly applied to full-duplex relay systems, they will face a serious loop self-interference problem. Therefore, how to eliminate self-interference becomes a key point in the research of full duplex relay network. On the basis of unidirectional full-duplex cooperative space-time coding, this paper proposes an asynchronous distributed space-time coding for bi-directional full-duplex cooperative communication system. In the bi-directional full-duplex communication network, each node adopts the FD mode, and can carry on the two-way communication transmission, which can greatly improve the spectrum efficiency. In this paper, the self-interference of each node in the bi-directional full-duplex system is analyzed. The residual loop self-interference signal is used as part of the distributed space-time code by canceling the partial loop self-interference at the relay node. An asynchronous cooperative distributed space-time self-coding system for dual-directional full-duplex systems is designed. At the same time, according to the inherent characteristics of two-way communication, the optimal power amplification factor criterion is adopted to optimize the overall performance of the cooperative communication system. The influence of the residual loop signal at the terminal node on the system performance and the influence of the residual loop signal at the relay node on the system performance are analyzed by simulation. At the same time, when the channel state is relatively good in the communication process, the influence of the residual loop signal at the terminal node on the system performance is analyzed. In this paper, we propose that the bi-directional fully duplex asynchronous cooperative distributed space-time code can gain full diversity gain and improve the performance and capacity of the system.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN92
本文编号：2258196
[Abstract]:Due to the limitation of limited spectrum resources, we have to further study new communication technologies to solve the problems in the field of mobile Internet communication. Future wireless communication systems need to provide more multimedia services and data services with high rates. The purpose of cooperative communication is to use node resources in the network to help nodes with communication needs to carry out high-speed and reliable wireless communication. Therefore, cooperative communication technology is expected to become the key technology in future communication systems. The node working mode in the network is divided into HD mode and FD mode. Half duplex cooperative communication space-time coding scheme can obtain good asynchronous cooperative full diversity gain. However, with the urgent need for the utilization of frequency resources, many scholars and institutions have come up with the idea of applying space-time coding technology to full-duplex relay networks, because its spectral efficiency can be doubled in theory. However, if these space-time coding schemes are directly applied to full-duplex relay systems, they will face a serious loop self-interference problem. Therefore, how to eliminate self-interference becomes a key point in the research of full duplex relay network. On the basis of unidirectional full-duplex cooperative space-time coding, this paper proposes an asynchronous distributed space-time coding for bi-directional full-duplex cooperative communication system. In the bi-directional full-duplex communication network, each node adopts the FD mode, and can carry on the two-way communication transmission, which can greatly improve the spectrum efficiency. In this paper, the self-interference of each node in the bi-directional full-duplex system is analyzed. The residual loop self-interference signal is used as part of the distributed space-time code by canceling the partial loop self-interference at the relay node. An asynchronous cooperative distributed space-time self-coding system for dual-directional full-duplex systems is designed. At the same time, according to the inherent characteristics of two-way communication, the optimal power amplification factor criterion is adopted to optimize the overall performance of the cooperative communication system. The influence of the residual loop signal at the terminal node on the system performance and the influence of the residual loop signal at the relay node on the system performance are analyzed by simulation. At the same time, when the channel state is relatively good in the communication process, the influence of the residual loop signal at the terminal node on the system performance is analyzed. In this paper, we propose that the bi-directional fully duplex asynchronous cooperative distributed space-time code can gain full diversity gain and improve the performance and capacity of the system.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN92
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1 李娜;单信道全双工无线通信系统中数字自干扰消除方法研究[D];山东大学;2013年
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