基于fpga的fsk調(diào)制解調(diào)-免費(fèi)閱讀
【正文】 通過(guò)本次設(shè)計(jì)，了解了頻移鍵控?cái)?shù)字通信系統(tǒng)的用途及工作原理，熟悉了FSK基于VHDL語(yǔ)言的設(shè)計(jì)步驟，提高了繪圖能力，鍛煉了設(shè)計(jì)實(shí)踐和語(yǔ)言組織能力，培養(yǎng)了自己獨(dú)立設(shè)計(jì)能力。仿真波形輸出文件FSKJT Simulation Report將自動(dòng)彈出如圖14所示。用鼠標(biāo)將時(shí)鐘信號(hào)節(jié)點(diǎn)clk、start、x、y、q、m和xx分別拖到波形編輯窗口，如圖13所示，此后關(guān)閉Nodes Found窗口即可。以FSK調(diào)制的輸出作為FSK解調(diào)的輸入。⑤文件存盤選擇File中的Save as項(xiàng)。③輸入工程信號(hào)節(jié)點(diǎn)選擇View菜單中的Utility Windows項(xiàng)的Node Finder，在此對(duì)話框Filter項(xiàng)中選擇Pins:allamp。FPGA課程設(shè)計(jì)——測(cè)試4 測(cè) 試 FSK調(diào)制仿真工程編譯通過(guò)后，必須對(duì)其功能和時(shí)序性能進(jìn)行仿真測(cè)試，以驗(yàn)證設(shè)計(jì)結(jié)果是否滿足設(shè)計(jì)要求。 END IF。 END IF。EVENT AND CLK=39。 系統(tǒng)時(shí)鐘 START:IN STD_LOGIC。 END IF。 PROCESS(CLK,X) 此進(jìn)程完成對(duì)基帶信號(hào)的FSK調(diào)制 BEGIN IF (CLK39。139。139。 ELSE F1=39。039。 調(diào)制信號(hào)END FSKTZ。圖5 非相干解調(diào)法原理框圖三、FSK的解調(diào)方框圖及電路符號(hào)圖6 FSK解調(diào)方框圖圖7 FSK解調(diào)電路符號(hào)13FPGA課程設(shè)計(jì)——設(shè)計(jì)方案3 設(shè)計(jì)方案 FSK基于VHDL語(yǔ)言調(diào)制程序文件名： FSKTZ功能：基于VHDL硬件描述語(yǔ)言，對(duì)基帶信號(hào)進(jìn)行FSK調(diào)制LIBRARY IEEE。它有兩個(gè)獨(dú)立的振蕩器，數(shù)字基帶信號(hào)控制轉(zhuǎn)換開(kāi)關(guān)，選擇不同頻率的高頻振蕩信號(hào)實(shí)現(xiàn)FSK調(diào)制。，在利用VHDL語(yǔ)言對(duì)FSK頻移鍵控系統(tǒng)進(jìn)行調(diào)制、解調(diào)的波形仿真。關(guān)鍵字 VHDL語(yǔ)言，F(xiàn)SK調(diào)制，F(xiàn)SK解調(diào)ⅠABSTRACTThe modem munication system is the key equipment, its performance has a direct relationship to the entire system performance. After nearly two weeks of experiments, we four members together, use Quartus II in the software of VHDL language to FSK FSK system will do modulation and demodulation of the program design. Finally made FSK modem. The design of FSK modems are: to determine the parameters of f1 = MHz, f2 = 2 MHz, modulation signal f = 1 MHz. The design of FSK circuit can be widely used in remote control system and frequency shift in munications. Utilize FSK modulator way of main advantage is: (1) no carrier recovery, and greatly reduce the system plexity. (2) the amplitude of the nonlinear of antijamming ability. Because FSK signal is a constant envelope signal, the information is fully contained in the signal zero, so, the amplitude modulated signal than by nonlinear antiinterference ability is ambitious. (3) demodulation is easy to use software and hardware realization, simple and understandable.Key word VHDL Language, FSK make, FSK solution adjustⅡFPGA課程設(shè)計(jì)目 錄摘 要…………………………………………………………………………………Ⅰ
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