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摘要
調(diào)制解調(diào)器是通信系統(tǒng)中的關(guān)鍵設(shè)備，其性能的好壞直接關(guān)系到整個系統(tǒng)的性能。本次設(shè)計的FSK調(diào)制系統(tǒng)具有抗干擾、抗噪聲、抗衰減性能較強、技術(shù)復(fù)雜程度比較低、成本低等諸多優(yōu)點，因而廣泛應(yīng)用與實際電路中。在中低速數(shù)據(jù)傳輸通信系統(tǒng)中得到了較為廣泛的應(yīng)用。此外，許多集成芯片里也用到了FSK調(diào)制技術(shù)。
本次設(shè)計的FSK電路可廣泛用于計算機網(wǎng)絡(luò)、辦公自動化、遠(yuǎn)程自控系統(tǒng)及移頻通信中?，F(xiàn)代通信系統(tǒng)要求通信距離遠(yuǎn)、通信容量大、傳輸質(zhì)量好。作為其關(guān)鍵技術(shù)之一的調(diào)制解調(diào)技術(shù)一直是人們研究的一個重要方向。從最早的模擬調(diào)幅調(diào)頻技術(shù)的日臻完善,到現(xiàn)在數(shù)字調(diào)制技術(shù)的廣泛運用,使得信息的傳輸更為有效和可靠.。采用FSK調(diào)制方式的主要優(yōu)點是：①無需載波恢復(fù)，大大降低了系統(tǒng)復(fù)雜度。②對幅度的非線性抗干擾能力強。因為FSK信號為恒包絡(luò)信號，其信息完全包含在信號的過零點上，所以比起調(diào)幅信號，其對幅度非線性抗干擾能力要強。③調(diào)制解調(diào)易用軟硬件實現(xiàn)，簡單易懂。

關(guān)鍵字： VHDL語言；2FSK調(diào)制；2FSK解調(diào)；MFSK調(diào)制

2FSK Digital modems Communication System Design
Summary
Modem is the key equipment of communications system; its performance will have a direct effect on the performance of the whole system. The design of the FSK modulation system has advantages such as anti-jamming, anti-noise, high-attenuation performance, relatively low technical complexity and low cost, thus widely applying in actual circuit. It has been more widely used in the low-speed data transmission communication system. In addition, many integrated chip also used the FSK modulation technique.
The design of the FSK circuit can be widely used in computer networking, office automation, remote-controlled system and the frequency shift in communication. Modern communication systems require far distance communications, telecommunications capacity, and transmission quality. As one of the key technologies of its modem technology has always been an important researching direction of people. From the earliest AM FM analog technology improving, and now digital modulation of the extensive use of technology, making the transmission of information more effective and reliable. The main advantages of using FSK modulation are: ① without carrier recovery, significantly reducing system complexity. ② strong anti-interference capability on the rate of non-linear. Because the FSK signals are constant envelope signals, the information are totally included in the over 0.1 signal point, rather than AM signals, having stronger anti-interference capability on the rate of non-linear. ③ modem is easy to achieve by using software and easy-to-understand.

Key word: VHDL Language；The 2FSK make；The 2FSK solution adjust；The MFSK make
目錄
摘要 1
Summary 2
緒論 3
1. EDA技術(shù)簡介 5
1.1 Quartus II簡介 6
1.2 VHDL語言簡介 8
2. FSK調(diào)制解調(diào)的基本原理 9
2.1 2FSK的調(diào)制 9
2.2 2FSK的解調(diào) 11
2.3 MFSK調(diào)制解調(diào) 13
3. FSK基于VHDL語言的調(diào)制解調(diào)設(shè)計 14
3.1 2FSK基于VHDL語言的調(diào)制過程 14
3.2 2FSK基于VHDL語言的解調(diào)過程 20
3.3 MFSK基于VHDL語言調(diào)制過程 25
4. FSK基于VHDL語言調(diào)制解調(diào)的仿真 29
4.1 2FSK調(diào)制仿真 29
4.2 2FSK解調(diào)仿真 33
4.3 MFSK調(diào)制仿真 37
設(shè)計總結(jié) 41
參考文獻(xiàn) 42
致謝 43