基于网络编码的无线协作通信系统研究
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摘要
网络编码作为一种可从理论上达到最小割-最大流容量的新技术已受到了学术界和工业界的广泛关注。在无线协作通信系统中引入网络编码技术,研究结果表明它可以在进一步提升网络吞吐量、负载均衡、安全性和增强鲁棒性等方面具有显著的优势。进一步地,近几年来所提出的物理层网络编码技术逐渐成为无线协作通信系统中的研究热点。
结合现有的研究成果及方法,本文主要针对下一代移动通信系统中所引入的无线协作中继技术以解决覆盖及容量提升等问题,将无线网络编码技术与无线协作中继技术相结合,给出不同无线协作中继场景下的无线网络编码方案,进一步验证其性能优势。最后结合无线协作通信系统中的生存性特点,给出基于网络编码的生存性保护策略及建模方法。主要研究内容为:
1.给出了网络编码应用于无线协作通信系统的研究现状,以及三类物理层网络编码技术—有限域上的物理层网络编码、模拟网络编码及复数域网络编码的研究现状及各自特点。进一步给出搭建基于模拟网络编码的无线协作通信系统的验证平台方案,并对物理层网络编码相关理论及其应用实现的发展趋势进行了分析与展望。
2.在双向协作中继场景下,给出了基于物理层网络编码的双向协作中继方案以及物理层网络编码实现的映射机制,并进一步给出以最小总功率消耗为目标的最优功率分配机制。与现有的机制相比较,该机制可显著提升系统的性能,提升系统资源利用效率。
3.在多址接入协作中继场景下,给出了基于模拟网络编码的多址协作中继方案,首次讨论了以最大化系统互信息为目标的基于模拟网络编码的多址接入协作中继最优功率分配存在性问题,给出了具体的功率分配策略,并进一步地讨论了该方案下的中断概率和吞吐量。与现有机制相比较,所提出的机制可获得一定的系统性能增益。
4.在多源-单中继-多目的点的协作中继场景下,给出了基于模拟网络编码的无线协作中继方案,分析了模拟网络编码噪声传播累积对系统性能的影响。在此基础上,率先给出了一种结合THP预编码的模拟网络编码机制。与现有的模拟网络编码机制相比较,它可有效降低模拟网络编码噪声的传播累积,使得系统获得较大的性能提升。
5.结合网络编码技术,给出了无线多对一协作传输场景下更为高效的单链路(单路径)失效的次优生存性策略。进一步地,结合已有的生存性建模和分析方法,以实际的无线协作通信系统—IP多媒体子系统为例,给出了基于随机Petri网的生存性建模及性能分析方法。最后,对影响生存性模型合理性的结构特征进行了分析,并首次给出了引起模型不合理的结构特征—无用的服务失效结构(结构混惑)的检测方法。
Network coding is a promising technique designed to reach the Min-cut Max-flow capacity and has been receiving widespread attention in academia and industry. Research results show that network coding can provide further higher network throughput, robustness, balance the traffic as well as security for wireless cooperative communication systems. In recent years, the physical layer network coding (PLNC) has been becoming research focus in wireless cooperative communication systems.
Combining with the research achievements and research methodology available, this dissertation will be aimed at the wireless signal cover and system capacity promotion problems when adopt cooperative relay technology in the next generation mobile communication systems. Integrating network coding with cooperative relay technology in wireless networks, the wireless network coding schemes in different cooperative relay scenarios and performance analysis are presented. Furthermore, combining with survivability trait, survivability protection strategy based on network coding and the method of survivability model are presented in wireless cooperative communication systems. Several research results are obtained as follows
1.The theory research development of the network coding in wireless cooperative communication systems is overviewed. Three types of physical layer network coding—physical network coding over finite field, analog network coding (ANC) and complex field network coding are presented. Their distinguishing feature, research development, new theory and technology related with them are introduced. Furthermore, the Testbed based on analog network coding in wireless cooperative communication systems is listed. The opening issues and challenges for PLNC referring to both theory and implementation in near future are proposed.
2.Under the two-way cooperative relay scenario with PLNC, the PLNC modulation and demodulation mapping mechanisms are presented. The optimal power allocation under the goal of minimizing system total power consumption is proposed and analyzed for the two-way cooperative relay with PLNC. Compared with the existing schemes, the proposed scheme can significantly improve system performance and resources efficiency.
3.The transmit power allocation of practical ANC scheme for multiple-access relay channel (MARC) is investigated, optimal transmit power allocation under the goal of maximizing the total mutual information is discussed. Furthermore, outage probability and throughput is analyzed under the ANC scheme for MARC. Compared with the existing schemes, the proposed scheme can obtain some performance gain.
4.Multiple source-destination sessions sharing the same single relay for cooperative communications employing ANC scheme is described, a detailed analysis for the achievable rate and ANC noise propagation is offered. Furthermore, an improved method of ANC inspired by Tomlinson-Harashima Precoding (THP) is first proposed. Compared with ANC scheme, the proposed scheme can effectively reduce the ANC noise propagation and achieve some performance improvement.
5.Combining with network coding, an effective sub-optimal strategy to build survivability protection against single link (path) failure on a specific many-to-one wireless links network topology is presented. Furthermore, take the wireless cooperative communication system—IP multimedia subsystem as an example, the survivability stochastic Petri nets (SPN) model is proposed under the existing model of survivability and performance analysis methodology. Finally, the structural character effect on survivability SPN model soundness is discussed, and useless service failure structure (structural confusion) in survivability SPN model is first presented.
结合现有的研究成果及方法,本文主要针对下一代移动通信系统中所引入的无线协作中继技术以解决覆盖及容量提升等问题,将无线网络编码技术与无线协作中继技术相结合,给出不同无线协作中继场景下的无线网络编码方案,进一步验证其性能优势。最后结合无线协作通信系统中的生存性特点,给出基于网络编码的生存性保护策略及建模方法。主要研究内容为:
1.给出了网络编码应用于无线协作通信系统的研究现状,以及三类物理层网络编码技术—有限域上的物理层网络编码、模拟网络编码及复数域网络编码的研究现状及各自特点。进一步给出搭建基于模拟网络编码的无线协作通信系统的验证平台方案,并对物理层网络编码相关理论及其应用实现的发展趋势进行了分析与展望。
2.在双向协作中继场景下,给出了基于物理层网络编码的双向协作中继方案以及物理层网络编码实现的映射机制,并进一步给出以最小总功率消耗为目标的最优功率分配机制。与现有的机制相比较,该机制可显著提升系统的性能,提升系统资源利用效率。
3.在多址接入协作中继场景下,给出了基于模拟网络编码的多址协作中继方案,首次讨论了以最大化系统互信息为目标的基于模拟网络编码的多址接入协作中继最优功率分配存在性问题,给出了具体的功率分配策略,并进一步地讨论了该方案下的中断概率和吞吐量。与现有机制相比较,所提出的机制可获得一定的系统性能增益。
4.在多源-单中继-多目的点的协作中继场景下,给出了基于模拟网络编码的无线协作中继方案,分析了模拟网络编码噪声传播累积对系统性能的影响。在此基础上,率先给出了一种结合THP预编码的模拟网络编码机制。与现有的模拟网络编码机制相比较,它可有效降低模拟网络编码噪声的传播累积,使得系统获得较大的性能提升。
5.结合网络编码技术,给出了无线多对一协作传输场景下更为高效的单链路(单路径)失效的次优生存性策略。进一步地,结合已有的生存性建模和分析方法,以实际的无线协作通信系统—IP多媒体子系统为例,给出了基于随机Petri网的生存性建模及性能分析方法。最后,对影响生存性模型合理性的结构特征进行了分析,并首次给出了引起模型不合理的结构特征—无用的服务失效结构(结构混惑)的检测方法。
Network coding is a promising technique designed to reach the Min-cut Max-flow capacity and has been receiving widespread attention in academia and industry. Research results show that network coding can provide further higher network throughput, robustness, balance the traffic as well as security for wireless cooperative communication systems. In recent years, the physical layer network coding (PLNC) has been becoming research focus in wireless cooperative communication systems.
Combining with the research achievements and research methodology available, this dissertation will be aimed at the wireless signal cover and system capacity promotion problems when adopt cooperative relay technology in the next generation mobile communication systems. Integrating network coding with cooperative relay technology in wireless networks, the wireless network coding schemes in different cooperative relay scenarios and performance analysis are presented. Furthermore, combining with survivability trait, survivability protection strategy based on network coding and the method of survivability model are presented in wireless cooperative communication systems. Several research results are obtained as follows
1.The theory research development of the network coding in wireless cooperative communication systems is overviewed. Three types of physical layer network coding—physical network coding over finite field, analog network coding (ANC) and complex field network coding are presented. Their distinguishing feature, research development, new theory and technology related with them are introduced. Furthermore, the Testbed based on analog network coding in wireless cooperative communication systems is listed. The opening issues and challenges for PLNC referring to both theory and implementation in near future are proposed.
2.Under the two-way cooperative relay scenario with PLNC, the PLNC modulation and demodulation mapping mechanisms are presented. The optimal power allocation under the goal of minimizing system total power consumption is proposed and analyzed for the two-way cooperative relay with PLNC. Compared with the existing schemes, the proposed scheme can significantly improve system performance and resources efficiency.
3.The transmit power allocation of practical ANC scheme for multiple-access relay channel (MARC) is investigated, optimal transmit power allocation under the goal of maximizing the total mutual information is discussed. Furthermore, outage probability and throughput is analyzed under the ANC scheme for MARC. Compared with the existing schemes, the proposed scheme can obtain some performance gain.
4.Multiple source-destination sessions sharing the same single relay for cooperative communications employing ANC scheme is described, a detailed analysis for the achievable rate and ANC noise propagation is offered. Furthermore, an improved method of ANC inspired by Tomlinson-Harashima Precoding (THP) is first proposed. Compared with ANC scheme, the proposed scheme can effectively reduce the ANC noise propagation and achieve some performance improvement.
5.Combining with network coding, an effective sub-optimal strategy to build survivability protection against single link (path) failure on a specific many-to-one wireless links network topology is presented. Furthermore, take the wireless cooperative communication system—IP multimedia subsystem as an example, the survivability stochastic Petri nets (SPN) model is proposed under the existing model of survivability and performance analysis methodology. Finally, the structural character effect on survivability SPN model soundness is discussed, and useless service failure structure (structural confusion) in survivability SPN model is first presented.
引文
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