基于MIMO的双绞线高速传输方法研究
发布时间：2018-08-21 10:52
【摘要】：以太网是现行最通用的局域网通信协议标准,而以非屏蔽双绞线为传输介质的以太网在整个以太网中应用广泛,在以太网、快速以太网、千兆网和万兆网中都定义了以非屏蔽双绞线为传输媒介的标准。非屏蔽双绞线以其价格便宜,易于综合布线等特点,成为以太网中采用最为广泛的传输介质之一,但是非屏蔽双绞线受到远端串扰的干扰,干扰随频率的增加而上升,且难以消除,成为抑制非屏蔽双绞线系统速率提高的主要因素。实质上,远端串扰包含来自远端其他线对发射信号的有用信息,本文利用远端串扰,引入多输入多输出技术,将远端串扰和经过线缆插入损耗的信号构成一个4×4多输入多输出模型。利用多输入多输出技术,变害为利,提高系统的容量。同时,采用正交频分复用技术将整个工作频带划分为多个子信道,有效提高了频谱利用率,在对正交频分复用子载波进行比特功率分配时采用本文所提出的比特功率分配算法,在相同于最优分配算法性能的基础上,大幅降低了分配算法的运算复杂度。本文的主要工作如下:首先对多输入多输出和正交频分复用技术基本原理进行了简要说明,分析了多输入多输出技术的容量,三种空时编码技术:空时分组码、空时格型码以及分层空时码;简要介绍了正交频分复用的数学模型,实现和几项关键技术,如同步技术、信道估计技术等;然后将多输入多输出和正交频分复用相结合,分析了多输入输出-正交频分复用系统结构和数学模型。其次对自适应比特功率分配算法进行了介绍,分析了自适应比特功率分配的理论基础,两种优化准则,接着描述了几种典型的自适应比特功率分配算法,最后对本文所提出的比特功率分配算法进行了介绍。最后,本文基于Matlab的m语言,构建了基于多输入多输出的双绞线高速传输仿真系统,文中对系统的工作流程,各系统模块功能进行了描述,最后给出了仿真的结果。仿真结果表明,在双绞线传输系统中引入多输入多输出技术将远端串扰转化为有用信号,克服了传统技术方案中远端串扰难以抑制的问题,显著提高系统容量。
[Abstract]:Ethernet is the most common local area network communication protocol standard, and Ethernet with unshielded twisted-pair transmission medium is widely used in the whole Ethernet, in Ethernet, fast Ethernet, The standard of unshielded twisted-pair wire is defined in both Gigabit and Gigabit networks. Unshielded twisted-pair wires have become one of the most widely used transmission media in Ethernet because of their low price and easy to synthesize wiring. However, unshielded twisted pair wires are disturbed by remote crosstalk, and the interference increases with the increase of frequency. And it is difficult to eliminate, which is the main factor to restrain the increase of the speed of unshielded twisted pair system. In essence, remote crosstalk contains useful information from other remote lines to transmit signals. In this paper, multi-output technology is introduced using remote crosstalk. A 4 脳 4 multi-input-multiple-output model is constructed by using the signal of remote crosstalk and cable insertion loss. The technology of multi-input and multi-output is used to improve the capacity of the system. At the same time, the orthogonal frequency division technology is used to divide the whole working frequency band into multiple sub-channels, which improves the spectrum efficiency effectively. The bit power allocation algorithm proposed in this paper is used in the sub-carrier allocation of orthogonal frequency division multiplexing. On the basis of the same performance as the optimal allocation algorithm, the computational complexity of the allocation algorithm is greatly reduced. The main work of this paper is as follows: firstly, the basic principle of multi-input multiple-output and orthogonal frequency division multiplexing is briefly explained, and the capacity of multi-input and multi-output technology, three space-time coding techniques: space-time block code, are analyzed. Space-time trellis code and layered space-time code are introduced briefly, the mathematical model of orthogonal frequency division multiplexing (OFDM) is introduced, and several key technologies, such as synchronization, channel estimation, etc, are briefly introduced, and then multiple input multiple output (MIMO) and orthogonal frequency division multiplexing (OFDM) are combined. The structure and mathematical model of multi-input output-orthogonal frequency division multiplexing system are analyzed. Secondly, the adaptive bit power allocation algorithm is introduced, the theoretical basis of adaptive bit power allocation and two optimization criteria are analyzed, and then several typical adaptive bit power allocation algorithms are described. Finally, the proposed bit power allocation algorithm is introduced. Finally, based on m language of Matlab, a high-speed transmission simulation system of twisted-pair cable based on multi-input and multi-output is constructed. The work flow of the system and the functions of each system module are described in this paper. Finally, the simulation results are given. The simulation results show that the multi-output technique is introduced to transform the remote crosstalk into useful signals in the twisted-pair transmission system, which overcomes the problem that the remote crosstalk is difficult to suppress in the traditional scheme, and improves the system capacity significantly.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3
本文编号：2195482
[Abstract]:Ethernet is the most common local area network communication protocol standard, and Ethernet with unshielded twisted-pair transmission medium is widely used in the whole Ethernet, in Ethernet, fast Ethernet, The standard of unshielded twisted-pair wire is defined in both Gigabit and Gigabit networks. Unshielded twisted-pair wires have become one of the most widely used transmission media in Ethernet because of their low price and easy to synthesize wiring. However, unshielded twisted pair wires are disturbed by remote crosstalk, and the interference increases with the increase of frequency. And it is difficult to eliminate, which is the main factor to restrain the increase of the speed of unshielded twisted pair system. In essence, remote crosstalk contains useful information from other remote lines to transmit signals. In this paper, multi-output technology is introduced using remote crosstalk. A 4 脳 4 multi-input-multiple-output model is constructed by using the signal of remote crosstalk and cable insertion loss. The technology of multi-input and multi-output is used to improve the capacity of the system. At the same time, the orthogonal frequency division technology is used to divide the whole working frequency band into multiple sub-channels, which improves the spectrum efficiency effectively. The bit power allocation algorithm proposed in this paper is used in the sub-carrier allocation of orthogonal frequency division multiplexing. On the basis of the same performance as the optimal allocation algorithm, the computational complexity of the allocation algorithm is greatly reduced. The main work of this paper is as follows: firstly, the basic principle of multi-input multiple-output and orthogonal frequency division multiplexing is briefly explained, and the capacity of multi-input and multi-output technology, three space-time coding techniques: space-time block code, are analyzed. Space-time trellis code and layered space-time code are introduced briefly, the mathematical model of orthogonal frequency division multiplexing (OFDM) is introduced, and several key technologies, such as synchronization, channel estimation, etc, are briefly introduced, and then multiple input multiple output (MIMO) and orthogonal frequency division multiplexing (OFDM) are combined. The structure and mathematical model of multi-input output-orthogonal frequency division multiplexing system are analyzed. Secondly, the adaptive bit power allocation algorithm is introduced, the theoretical basis of adaptive bit power allocation and two optimization criteria are analyzed, and then several typical adaptive bit power allocation algorithms are described. Finally, the proposed bit power allocation algorithm is introduced. Finally, based on m language of Matlab, a high-speed transmission simulation system of twisted-pair cable based on multi-input and multi-output is constructed. The work flow of the system and the functions of each system module are described in this paper. Finally, the simulation results are given. The simulation results show that the multi-output technique is introduced to transform the remote crosstalk into useful signals in the twisted-pair transmission system, which overcomes the problem that the remote crosstalk is difficult to suppress in the traditional scheme, and improves the system capacity significantly.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3
【参考文献】
相关期刊论文 前1条
1 张雅慧;张海林;;MIMO系统中STBC与STTC的性能分析[J];电子科技;2006年05期
，本文编号：2195482
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