【正文】 菜單ProjectOption，在“Category”選擇“General Options”,在右邊的對(duì)話框中選擇“Target”頁(yè)，在此頁(yè)的“Device”欄中選擇主芯片型號(hào)。再到左邊的“Category”中選擇“Debugger”，右邊顯示如圖3－3。在“driver”欄中有兩個(gè)選項(xiàng)是“simulator”和“FET Debugger”，前者是軟件仿真，后者是硬件仿真。硬件調(diào)試時(shí)選擇“FET Debugger”。再選擇左邊的“FET Debugger”來(lái)選擇調(diào)試工具類型。在“Connection”欄中選擇“Lpt”。這樣整個(gè)工程設(shè)置完成了，可以進(jìn)入下一步調(diào)試了（4）源程序下載在IAR Embedded Workbench 界面，點(diǎn)擊Debugger 下載程序，然后即可以進(jìn)行仿真。如出現(xiàn)錯(cuò)誤，必須回到IAR Embedded Workbench 界面修改，修改完畢后重新進(jìn)行編譯、下載。（5） 仿真調(diào)試在調(diào)試界面,可以設(shè)置斷點(diǎn)、觀察變量、單步等，如有修改源程序，再重新回到步驟4，重復(fù)步驟4 和5，直到程序調(diào)試無(wú)誤。167。 程序調(diào)試結(jié)果分析在整個(gè)系統(tǒng)的設(shè)計(jì)過程中，主要對(duì)ST12C5A60S2單片機(jī)的數(shù)據(jù)接收和發(fā)送模塊、電力線數(shù)據(jù)接收和發(fā)送模塊、ST7536調(diào)制解調(diào)等模塊的程序進(jìn)行了調(diào)試。 ST12C5A60S2單片機(jī)的數(shù)據(jù)接收和發(fā)送模塊的調(diào)制，主要是測(cè)試電力線傳輸數(shù)據(jù)的正確性以及損耗。在調(diào)試過程中我們發(fā)現(xiàn)由于電力線上的干擾及噪聲相當(dāng)大，信號(hào)的傳輸損耗有點(diǎn)大，在操作過程中由于P2口是直接與220V供電線路相連，存在一定的危險(xiǎn)。結(jié) 論為期近三個(gè)月的畢業(yè)設(shè)計(jì)業(yè)已接近尾聲，在三個(gè)月的設(shè)計(jì)期間，我受益匪淺，通過這次畢業(yè)設(shè)計(jì)對(duì)四年大學(xué)所學(xué)知識(shí)和能力的做了一個(gè)總結(jié)，在設(shè)計(jì)期間我應(yīng)用到了許多書本曾經(jīng)學(xué)過的各種理論知識(shí)，我把他們應(yīng)用到實(shí)際中來(lái)，對(duì)書本上的知識(shí)有了更加具體的了解。本次設(shè)計(jì)的題目是“數(shù)字信號(hào)在電源供電線路上的載波傳輸電路設(shè)計(jì)” 從輔導(dǎo)老師布置下任務(wù)，我們就開始了緊張有序的做畢業(yè)設(shè)計(jì)的準(zhǔn)備工作，通過翻閱大量的相關(guān)材料，了解了單片機(jī)ST12C5A60S2的硬件設(shè)計(jì)和軟件開發(fā)，增強(qiáng)了運(yùn)用單片機(jī)開發(fā)系統(tǒng)的能力,同時(shí)熟悉ST7536的工作原理，更在軟件開發(fā)平臺(tái)（IAR）上，學(xué)會(huì)了一些軟件開發(fā)，提高了自己分析問題和解決問題的能力。硬件設(shè)計(jì)上，繪制PCB電路圖提高了自己的繪圖能力，雖然在電路圖的繪制和硬件的調(diào)試過程中也出現(xiàn)了不少問題，但在同學(xué)和老師的幫助下最終都一一的解決了。最后軟硬件結(jié)合終于實(shí)現(xiàn)電力線的載波通信設(shè)計(jì)。最后得到的結(jié)果是：PC機(jī)1通過MAX232發(fā)送數(shù)據(jù)和指令給單片機(jī)，單片機(jī)再將數(shù)據(jù)發(fā)送給ST7536芯片，通過芯片調(diào)制后發(fā)送到電力線上。同時(shí)通過P2口發(fā)送信號(hào)到電力線，經(jīng)過ST7536芯片的解調(diào)，再經(jīng)P1口發(fā)送給PC機(jī)1,從而實(shí)現(xiàn)電力線的載波通信。參 考 文 獻(xiàn)[1] 宏晶STC單片機(jī)公司STC12C5A60S2系列單片機(jī)器件手冊(cè)。 [2] .[期刊雜志]現(xiàn)代電子技術(shù)，[3] 馬忠梅、（第四版）.北京：航空航天大學(xué)出版社，[4] ：北京航空航天大學(xué)出版社，[5] 童詩(shī)白、：高等教育出版社，[6] 樊昌信、張甫里、徐炳祥、：國(guó)防工業(yè)出版社，[7] ：.[8] 高傳善、張世勇、曲海、：.[9] （第二版）.北京：[10] 戴梅萼、(第二版).北京： [11] ：[12] 童詩(shī)白、：[13] 石東海、扈嘯、：西安電子科技大學(xué)， [14] （第二版）.北京：清華大學(xué)出版社，[15] 戴梅萼，(第二版).北京：清華大學(xué)出版社，[16] ：西安電子科技大學(xué)出版社，[17] ：北京郵電出版社，致 謝 在本項(xiàng)目的整個(gè)設(shè)計(jì)過程中，寧永海老師付出了大量心血，從項(xiàng)目規(guī)劃到具體功能實(shí)現(xiàn)，寧老師都給與我們?cè)S多幫助和指導(dǎo)，他還在平時(shí)的工作中潛移默化的培養(yǎng)我們的科研素質(zhì)，并用自己的身體力行來(lái)教育我們，抽出大量的時(shí)間對(duì)我們的畢業(yè)設(shè)計(jì)進(jìn)行輔導(dǎo)，在此我向?qū)幚蠋熣嬲\(chéng)的致謝！本設(shè)計(jì)是由郭旺、孫冰共同設(shè)計(jì)的。在整個(gè)設(shè)計(jì)過程中，他給予了我大量的幫助。在最困難的時(shí)候，我們大家齊心合力，共度難關(guān)，終于在寧老師的指導(dǎo)和幫助下，完成了此設(shè)計(jì)項(xiàng)目，在此向他們表示感謝。同時(shí)，在設(shè)計(jì)中，電信學(xué)院電信教研室的老師也給予我許多有益的指導(dǎo)，在此一并向他們表示感謝。附 錄 系統(tǒng)PCB原理圖：外文資料原文Modeling Low Voltage Power Line as a Data Communication Channel ABSTRACTPower line munications may be used as a data munication channel in public and indoor distribution networks so that it does not require the installing of new cables. Industrial low voltage distribution network may be utilized for data transfer required by the online condition monitoring of electric motors. This paper presents a pilot distribution network for modeling low voltage power line as data transfer channel. The signal attenuation in munication channels in the pilot environment is presented and the analysis is done by varying the corresponding parameters for the signal attenuation.Keywords—Data munication, indoor distribution networks,low voltage, power line.1 INTRODUCTION Typical power line cable consists of three conductors: a phase, a neutral, and ground. Two of these three conductors suffice to create a munication channel. Since the phase and neutral conductors have equal wire gauge, we use these two conductors as the munication channel. Power lines have been used for low speed (30 kbps) data munication in applications like power distribution automation and remote meter reading and local area networks for many years [1]. Nowadays, due to the increasing importance of networking in homes, offices and industrial buildings, power lines are being considered as a candidate for medium and high speed ( 2 Mbps) data transmission. [2, 3, 4]. The term “l(fā)owvoltage power line munication system” refers to transmission over the existing power lines, which would normally require additional hard ware installation. This system is attractive because it reuses the existing lower voltage distribution network。 hence, new cabling installation can be avoided. Therefore, small investment and cost savings can be achieved [5]. The main driving force lies in that it can provide good business opportunities for a variety of different areas including electrical power engineering, munication networks as well as building automation, because the networks are almost universal in coverage and are easily accessed by wall plugs [6]. However, unlike the other wired munication mediums such as the unshielded twisted pair (UTP) and coaxial cables, LV power lines present an extremely harsh environment for channel parameters namely, noise(background noise, narrow noise amp。 impulse noise), impedance mismatch and attenuation are found to be highly unpredictable and variables with time, frequency and location. Therefore, it is a real challenge to realize high rate data transmission over the lowvoltage distribution network. One of the most important problems to solve is to find the appropriate modulation technique. In order to overe these difficulties, a lot of efforts have been undertaken to characterize and model the LV power line channel [4]. The objective of this paper is to model low voltage power line channel as a series bination of T or ? sections and derive its transfer function with given length and size based on the transmission line theory. This model will help the PLC system designer to better understand the channel behaviors and to engineer the channel performance under unpredictable load conditions. That is followed by the plotting the transfer function that show how much in magnitude and angle loss a signal suffers passing through this line and also show the loading effect on a signal along with the signal reflection. At the end of the paper, it has been demonstrated the results in graphs which are obtained by Matlab.2 POWER LINE CHANNELMODELING In order to simulate powerline munications, a channel model has to be formed. There are two main methods used to model power line channels [7]. The first one applies the methods used for the modeling of radio channels. It assumes the distribution network as a multipath propagation channel. The parameters of the channel are acquired based on the topology of the distribution network or based on the channel measurements and optimization algo