极化编码中继协作与网络编码系统的构造与性能研究

发布时间：2018-06-30 21:30

本文选题：极化码 + 信道编码　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：通信技术深刻地影响了人们的生活方式,并且随着现代社会的不断发展,人们对通信服务提出了更高的要求,如何保证通信服务的可靠性,有效性,一直是通信领域的研究热点。信道编码技术是一种可以提高通信系统可靠性的方式,目前最新的信道编码方式是由Arikan提出的极化码编码。极化码从理论上证明可以达到香农限,并且具有较低的编译码复杂度。协作通信的提出又为通信技术的发展作出了贡献,通过共享用户间的资源,通过不同的信道发送信息,获得了分集增益,提高了系统的性能。本文研究了极化码的基本原理以及极化码的系统码编码,并将极化码与编码协作、网络编码相结合,主要的研究内容和创新点如下:(1)比较分析了传统信道编码与极化码的区别与联系,研究了信道极化现象,分析了产生极化现象的原因;研究了信道的组合与分解,并对相关的公式做了理论推导证明;介绍了极化码的编码算法,在研究极化码的原始SC译码算法的基础上,推导了其他的译码方式的算法过程,有对数似然SC译码算法,最小和译码算法,基于整数量化的极化码译码算法等。同时介绍了SC译码的改进算法SCL译码算法。对不同的译码算法,不同的信道条件以及不同的极化码构造方法对极化码性能的影响做了仿真。(2)极化码最初是以非系统码的形式提出来的,作为一种线性分组码,也是可以进行系统编码的。在非系统极化码的基础上,研究了极化码的系统码的编译码算法,分析了系统极化码的编码复杂度。通过仿真说明了系统极化码的性能优于非系统极化码,分析了系统极化码的误码率。(3)在研究了系统极化码的基础上,将系统极化码与协作通信技术相结合,提出了一种基于系统极化码的编码协作模型,并给出了各部分的实现框图,详细分析了各节点的实现过程,计算了整个协作系统的系统码率。通过仿真,说明了本文所提出的编码协作方案与已有的基于Plotkin结构的编码协作方案相比,具有更优异的性能。(4)针对多信源的特点,引入了网络编码技术,研究了在双向中继通信中的两种网络编码方案,分别是直接网络编码方案和物理层网络编码方案,并通过仿真分析比较了两种方案的性能及特点。提出了一种基于极化码的网络编码协作通信方案,通过仿真说明了网络编码协作通信系统性能优于非协作系统的性能,并在不同的信道条件下对所提出的方案进行了仿真和分析。
[Abstract]:Communication technology has deeply influenced people's way of life, and with the development of modern society, people have put forward higher requirements for communication services, how to ensure the reliability and effectiveness of communication services, It has always been a research hotspot in the field of communication. Channel coding technology is a way to improve the reliability of communication systems. At present, the latest channel coding method is polarimetric code proposed by Arikan. It is proved theoretically that polarization codes can reach Shannon limit and have low encoding and decoding complexity. The proposed cooperative communication contributes to the development of communication technology. By sharing the resources between users and sending information through different channels, the diversity gain is obtained and the performance of the system is improved. In this paper, we study the basic principle of polarization code and the system code coding of polarization code, and combine polarization code with coding cooperation and network coding. The main research contents and innovations are as follows: (1) the differences and relations between traditional channel coding and polarization code are compared and analyzed, the polarization phenomenon of channel is studied, the reason of polarization phenomenon is analyzed, and the combination and decomposition of channel are studied. The relevant formulas are theoretically deduced and proved, and the coding algorithm of polarization code is introduced. On the basis of studying the original SC decoding algorithm of polarimetric code, the algorithm of other decoding methods, logarithmic likelihood SC decoding algorithm, is derived. Minimum sum decoding algorithm, polarization code decoding algorithm based on integer quantization and so on. At the same time, the improved SC decoding algorithm SCL decoding algorithm is introduced. The effects of different decoding algorithms, different channel conditions and different construction methods of polarization codes on the performance of polarization codes are simulated. (2) polarization codes are originally proposed as a linear block code in the form of non-system codes. It is also possible to code the system. Based on the non-system polarization code, the encoding and decoding algorithm of the system code is studied, and the encoding complexity of the system polarization code is analyzed. The performance of the system polarization code is proved to be superior to that of the non-system polarization code by simulation. The bit error rate of the system polarization code is analyzed. (3) based on the study of the system polarization code, the system polarization code is combined with the cooperative communication technology. In this paper, a coding cooperation model based on system polarization code is proposed, and the implementation block diagram of each part is given. The implementation process of each node is analyzed in detail, and the system code rate of the whole cooperative system is calculated. The simulation results show that the proposed coding cooperation scheme has better performance than the existing Plotkin scheme. (4) Network coding technology is introduced for the characteristics of multiple sources. In this paper, two kinds of network coding schemes in bidirectional relay communication are studied, one is direct network coding scheme and the other is physical layer network coding scheme, and the performance and characteristics of the two schemes are compared by simulation. A network coding cooperative communication scheme based on polarization code is proposed. The simulation results show that the performance of network coded cooperative communication system is better than that of non-cooperative system. The proposed scheme is simulated and analyzed under different channel conditions.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.22

【参考文献】