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

【摘要】：隨著數字用戶線路技術(Digital Subscriber Line,DSL)的發(fā)展,以VDSL2、G.fast等為代表的xDSL技術,在充分運用已鋪設銅線資源的條件下,可提供與無源光纖網相近的通信帶寬,并大幅降低寬帶網絡投資。同時,隨著用戶對寬帶通信質量要求的提高,寬帶通信設備的研發(fā)也變得越來越復雜,設備廠商的系統測試環(huán)節(jié)在整個設備研發(fā)過程中所占的比重也隨之增大。為了縮減開發(fā)周期和保證設備質量,設備檢驗員急需在實驗室環(huán)境下還原出寬帶有線信道的傳輸特征,用以對開發(fā)的通訊設備開展測驗評估。伴隨多業(yè)務、高帶寬、串擾等DSL寬帶通信新特征的產生,傳統的信道模擬方案已經不能滿足當前寬帶通信設備的測試需求�；诖�,本文實現了一種基于FPGA的xDSL信道模擬器,其具有頻譜范圍廣、升級難度低、擴展性能好等優(yōu)點,可在DSL通訊設備測驗中發(fā)揮重要作用。本文設計的xDSL信道模擬器使用Xilinx公司的Virtex-7系列芯片實現了8線對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的主要參數,重點分析了信道的遠端衰減特性和遠端串擾特性,實現了基于FPGA的xDSL信道模擬器,并進行了測試驗證。首先,本文研究了xDSL信道的傳輸特性,對xDSL信道的理論模型進行深入分析,著重分析了DSL傳輸信道的遠端衰減特性和遠端串擾特性。其次,分析了基于FPGA的xDSL信道模擬系統的總體架構,對信道模擬器的硬件結構進行了分析,提出了一種基于FPGA的xDSL信道模擬方案。針對FPGA內部資源分配,分析了xDSL信道模擬器FPGA實現過程中的難點,劃分了主要功能模塊。主要完成了數據采集、信號檢測、遠端衰減、片間互連、遠端串擾、UDP通信等模塊的代碼開發(fā)和板上調試;分析了模擬器的控制通信協議,并編寫了PC端交互軟件;完成了8線對xDSL傳輸模擬器與PC后臺界面的聯合調試。最后,對xDSL信道模擬器進行系統測試,利用xDSL局端和遠端設備對不同傳輸帶寬和不同傳輸距離下的信道特性進行實際測試,即在信道的各傳輸路徑上測試其上下行的信噪比、傳輸速率等參數,測試結果符合規(guī)定的參數要求。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN915.6

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本文編號：1809817