【摘要】：以太網(wǎng)是現(xiàn)行最通用的局域網(wǎng)通信協(xié)議標準,而以非屏蔽雙絞線為傳輸介質(zhì)的以太網(wǎng)在整個以太網(wǎng)中應(yīng)用廣泛,在以太網(wǎng)、快速以太網(wǎng)、千兆網(wǎng)和萬兆網(wǎng)中都定義了以非屏蔽雙絞線為傳輸媒介的標準。非屏蔽雙絞線以其價格便宜,易于綜合布線等特點,成為以太網(wǎng)中采用最為廣泛的傳輸介質(zhì)之一,但是非屏蔽雙絞線受到遠端串擾的干擾,干擾隨頻率的增加而上升,且難以消除,成為抑制非屏蔽雙絞線系統(tǒng)速率提高的主要因素。實質(zhì)上,遠端串擾包含來自遠端其他線對發(fā)射信號的有用信息,本文利用遠端串擾,引入多輸入多輸出技術(shù),將遠端串擾和經(jīng)過線纜插入損耗的信號構(gòu)成一個4×4多輸入多輸出模型。利用多輸入多輸出技術(shù),變害為利,提高系統(tǒng)的容量。同時,采用正交頻分復(fù)用技術(shù)將整個工作頻帶劃分為多個子信道,有效提高了頻譜利用率,在對正交頻分復(fù)用子載波進行比特功率分配時采用本文所提出的比特功率分配算法,在相同于最優(yōu)分配算法性能的基礎(chǔ)上,大幅降低了分配算法的運算復(fù)雜度。本文的主要工作如下:首先對多輸入多輸出和正交頻分復(fù)用技術(shù)基本原理進行了簡要說明,分析了多輸入多輸出技術(shù)的容量,三種空時編碼技術(shù):空時分組碼、空時格型碼以及分層空時碼;簡要介紹了正交頻分復(fù)用的數(shù)學(xué)模型,實現(xiàn)和幾項關(guān)鍵技術(shù),如同步技術(shù)、信道估計技術(shù)等;然后將多輸入多輸出和正交頻分復(fù)用相結(jié)合,分析了多輸入輸出-正交頻分復(fù)用系統(tǒng)結(jié)構(gòu)和數(shù)學(xué)模型。其次對自適應(yīng)比特功率分配算法進行了介紹,分析了自適應(yīng)比特功率分配的理論基礎(chǔ),兩種優(yōu)化準則,接著描述了幾種典型的自適應(yīng)比特功率分配算法,最后對本文所提出的比特功率分配算法進行了介紹。最后,本文基于Matlab的m語言,構(gòu)建了基于多輸入多輸出的雙絞線高速傳輸仿真系統(tǒng),文中對系統(tǒng)的工作流程,各系統(tǒng)模塊功能進行了描述,最后給出了仿真的結(jié)果。仿真結(jié)果表明,在雙絞線傳輸系統(tǒng)中引入多輸入多輸出技術(shù)將遠端串擾轉(zhuǎn)化為有用信號,克服了傳統(tǒng)技術(shù)方案中遠端串擾難以抑制的問題,顯著提高系統(tǒng)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.3

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相關(guān)期刊論文 前1條

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本文編號：2195482