基于FPGA 的振幅鍵控調(diào)制器與解調(diào)器的設(shè)計與實(shí)現(xiàn)
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資料類別
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電子電工畢業(yè)論文(設(shè)計) |
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課程(專業(yè))
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通信工程 |
關(guān)鍵詞
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振幅鍵控|調(diào)制解調(diào) |
適用年級
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大學(xué) |
身份要求
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普通會員 |
金 幣
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36 。金幣如何獲得?) |
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word |
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800K |
發(fā)布時間
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2009-04-14 21:17:00 |
預(yù)覽文件
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無 |
下載次數(shù)
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14 |
發(fā)布人 |
lcw |
內(nèi)容簡介:
畢業(yè)設(shè)計 基于FPGA 的振幅鍵控調(diào)制器與解調(diào)器的設(shè)計與實(shí)現(xiàn) 共38頁,24715字
[摘 要] 1934年美國學(xué)者李佛西提出脈沖編碼調(diào)制(PCM)的概念,從此之后通信數(shù)字化的時代應(yīng)該說已經(jīng)開始了,但是數(shù)字通信的高速發(fā)展卻是20世紀(jì)70年代以后才開始的。隨著時代的發(fā)展,用戶不再滿足于聽到聲音,而且還要看到圖像;通信終端也不局限于單一的電話機(jī),而且還有傳真機(jī)和計算機(jī)等數(shù)據(jù)終端,F(xiàn)有的傳輸媒介電纜、微波中繼和衛(wèi)星通信等將更多地采用數(shù)字傳輸。在數(shù)字傳輸系統(tǒng)中,數(shù)字信號對高頻載波進(jìn)行調(diào)制,變成頻帶信號,在接收端進(jìn)行解調(diào),恢復(fù)原數(shù)字信號對載波的控制分為振幅調(diào)制即振幅鍵控(ASK),頻率調(diào)制即頻率鍵控(FSK)和相位調(diào)制即相位鍵控(PSK),F(xiàn)場可編程門陣列(FPGA)在通信領(lǐng)域得到了廣泛的應(yīng)用,利用FPGA性能優(yōu)越、使用方便的特點(diǎn),可以簡化振幅調(diào)制解調(diào)電路的設(shè)計,而且易于反復(fù)編寫和修改程序。文章介紹了 運(yùn)用VHDL 語言進(jìn)行基于FPGA 的振幅鍵控調(diào)制電路和解調(diào)電路設(shè)計的實(shí)現(xiàn)方案, 給出了程序設(shè)計和仿真結(jié)果, 完成了二進(jìn)制基帶數(shù)字信號的調(diào)制和解調(diào), 得到了相應(yīng)的調(diào)制信號和解調(diào)信號。
[關(guān)鍵詞]FPGA 振幅鍵控 調(diào)制解調(diào) VHDL
[Abstract]Communication digital era had began since American researcher Reeves put forward the concept of pulse code modulation (PCM) in 1934 and gained a rapid development after the 1970s. With the economic development, sound can’t meet the demand of consumers and they also want to see the images. What’s more, communication terminal doesn’t only include the single telephone set but also the data terminal such as electro-graph and computer. Current transmission medium such as cable,microwave repeater and satellite communication will prefer to use digital transmission. In digital transmission system, the digital signal are used to modulate the high frequency carrier wave to the frequency signal ,which transfers through the channel, are renewed at the receiver. Three ways to modulate the carrier wave are as follows:Amplitude Shift Keying(ASK),Frequency-Shift Keying(FSK) and Phase Shift Keying(PSK).Field-Programmable Gate Array(FPGA) is applied universally in the communication field. With the superior performance and utilization convenience of FPGA, the design of circuit in the Amplitude modulation and demodulation can be simplified and it’s easy for us to compile and modify the programme. This thesis introduces the main realization method of designing Amplitude Shift Keying modulation and demodulation circuit based on FPGA in VHDL ,illustrates the programme design and simulation result, implement the modulation and demodulation of binary baseband digital signal and finally finds out the corresponding modulation signal and demodulation signal.
[Key words] FPGA Amplitude shift keying Modem VHDL
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