本文選題：xDSL信道 + 傳輸線模型��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：隨著數(shù)字用戶線路技術(shù)(Digital Subscriber Line,DSL)的發(fā)展,以VDSL2、G.fast等為代表的xDSL技術(shù),在充分運(yùn)用已鋪設(shè)銅線資源的條件下,可提供與無(wú)源光纖網(wǎng)相近的通信帶寬,并大幅降低寬帶網(wǎng)絡(luò)投資。同時(shí),隨著用戶對(duì)寬帶通信質(zhì)量要求的提高,寬帶通信設(shè)備的研發(fā)也變得越來(lái)越復(fù)雜,設(shè)備廠商的系統(tǒng)測(cè)試環(huán)節(jié)在整個(gè)設(shè)備研發(fā)過程中所占的比重也隨之增大。為了縮減開發(fā)周期和保證設(shè)備質(zhì)量,設(shè)備檢驗(yàn)員急需在實(shí)驗(yàn)室環(huán)境下還原出寬帶有線信道的傳輸特征,用以對(duì)開發(fā)的通訊設(shè)備開展測(cè)驗(yàn)評(píng)估。伴隨多業(yè)務(wù)、高帶寬、串?dāng)_等DSL寬帶通信新特征的產(chǎn)生,傳統(tǒng)的信道模擬方案已經(jīng)不能滿足當(dāng)前寬帶通信設(shè)備的測(cè)試需求。基于此,本文實(shí)現(xiàn)了一種基于FPGA的xDSL信道模擬器,其具有頻譜范圍廣、升級(jí)難度低、擴(kuò)展性能好等優(yōu)點(diǎn),可在DSL通訊設(shè)備測(cè)驗(yàn)中發(fā)揮重要作用。本文設(shè)計(jì)的xDSL信道模擬器使用Xilinx公司的Virtex-7系列芯片實(shí)現(xiàn)了8線對(duì)雙絞線信道的上下行模擬。從xDSL信道的傳輸特性出發(fā),分析了xDSL信道的傳輸模型和影響信道傳輸?shù)闹饕獏?shù),重點(diǎn)分析了信道的遠(yuǎn)端衰減特性和遠(yuǎn)端串?dāng)_特性,實(shí)現(xiàn)了基于FPGA的xDSL信道模擬器,并進(jìn)行了測(cè)試驗(yàn)證。首先,本文研究了xDSL信道的傳輸特性,對(duì)xDSL信道的理論模型進(jìn)行深入分析,著重分析了DSL傳輸信道的遠(yuǎn)端衰減特性和遠(yuǎn)端串?dāng)_特性。其次,分析了基于FPGA的xDSL信道模擬系統(tǒng)的總體架構(gòu),對(duì)信道模擬器的硬件結(jié)構(gòu)進(jìn)行了分析,提出了一種基于FPGA的xDSL信道模擬方案。針對(duì)FPGA內(nèi)部資源分配,分析了xDSL信道模擬器FPGA實(shí)現(xiàn)過程中的難點(diǎn),劃分了主要功能模塊。主要完成了數(shù)據(jù)采集、信號(hào)檢測(cè)、遠(yuǎn)端衰減、片間互連、遠(yuǎn)端串?dāng)_、UDP通信等模塊的代碼開發(fā)和板上調(diào)試;分析了模擬器的控制通信協(xié)議,并編寫了PC端交互軟件;完成了8線對(duì)xDSL傳輸模擬器與PC后臺(tái)界面的聯(lián)合調(diào)試。最后,對(duì)xDSL信道模擬器進(jìn)行系統(tǒng)測(cè)試,利用xDSL局端和遠(yuǎn)端設(shè)備對(duì)不同傳輸帶寬和不同傳輸距離下的信道特性進(jìn)行實(shí)際測(cè)試,即在信道的各傳輸路徑上測(cè)試其上下行的信噪比、傳輸速率等參數(shù),測(cè)試結(jié)果符合規(guī)定的參數(shù)要求。
[Abstract]:With the development of Digital Subscriber Line (DSL), the xDSL technology, such as VDSL2G. Fast and so on, can provide the communication bandwidth close to that of passive optical fiber network under the condition of fully utilizing copper wire resources, and greatly reduce the investment in broadband network. At the same time, with the improvement of broadband communication quality, the research and development of broadband communication equipment is becoming more and more complex, and the proportion of system testing of equipment manufacturers in the whole process of equipment development is also increasing. In order to reduce the development cycle and ensure the quality of the equipment, the equipment inspectors urgently need to restore the transmission characteristics of the wideband wired channel in the laboratory environment, which can be used to test and evaluate the communication equipment developed. With the emergence of new features of DSL broadband communication such as multi-service, high-bandwidth and crosstalk, the traditional channel simulation scheme can no longer meet the test requirements of current broadband communication equipment. Based on this, this paper implements a xDSL channel simulator based on FPGA, which has the advantages of wide spectrum range, low difficulty in upgrading and good expansion performance. It can play an important role in the test of DSL communication equipment. The xDSL channel simulator designed in this paper uses the Virtex-7 series chips of Xilinx Company to realize the uplink and downlink simulation of 8-wire pair twisted-pair channel. Based on the transmission characteristics of xDSL channel, the transmission model of xDSL channel and the main parameters affecting the channel transmission are analyzed. The remote attenuation and crosstalk characteristics of the channel are analyzed, and the xDSL channel simulator based on FPGA is realized. The test and verification are carried out. Firstly, the transmission characteristics of xDSL channel are studied in this paper. The theoretical model of xDSL channel is analyzed in depth, and the remote attenuation and crosstalk characteristics of DSL transmission channel are emphatically analyzed. Secondly, the overall architecture of xDSL channel simulation system based on FPGA is analyzed, the hardware structure of channel simulator is analyzed, and a xDSL channel simulation scheme based on FPGA is proposed. According to the internal resource allocation of FPGA, the difficulties in FPGA implementation of xDSL channel simulator are analyzed, and the main function modules are divided. The code development and on-board debugging of data acquisition, signal detection, remote attenuation, interconnect between chips, remote crosstalk UDP communication are accomplished, and the control communication protocol of simulator is analyzed, and the interactive software of PC is written. The 8-line xDSL transmission simulator and PC background interface are debugged. Finally, the xDSL channel simulator is tested systematically, and the channel characteristics under different transmission bandwidth and different transmission distance are tested by using the xDSL terminal and remote equipment, that is, the signal to noise ratio (SNR) of the channel is tested on each transmission path of the channel. Transmission rate and other parameters, the test results meet the requirements of the specified parameters.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN915.6

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本文編號(hào)：1809817