fsk調制解調設計系統(tǒng)畢業(yè)設計word格式(已修改)
2024-12-15 06:08 本頁面
【正文】 畢業(yè)設計 摘 要 隨著社會的不斷發(fā)展 ,通信對我們來說越來越顯的重要 .對于通信技術來講 ,通信的質量也就顯的非常的關鍵 .通信的根本任務是如何保證遠距離傳輸信息的正確性，在這方面數字通信系統(tǒng)具有先天的優(yōu)勢。這主要是因為數字通信系統(tǒng)中傳輸的是離散的數字信號，由于信號是離散的，被噪聲干擾后的信號只要沒有超過門限，接收端就能夠完全正確地判斷出傳輸的信息；而對于模擬傳輸系統(tǒng)，只要有稍微的干擾都會使傳輸的信息產生錯誤。也正是由于這樣的原因，數字通信系統(tǒng)才能在各方面逐漸代替模擬通信系統(tǒng)成為現(xiàn)代通信的最基 本方式。為了便于區(qū)別信號與噪聲，使通信不失真和不受干擾 ,往往給測量信號賦以一定特征，這就是調制的主要功能。調制就是用一個信號（稱為調制信號）去控制另一作為載體的信號（稱為載波信號），讓后者的某一特征參數按前者變化。再將測量信號調制，并將它和噪聲分離，放大等處理后，還要從已經調制的信號中提取反映被測量值的測量信號，這一過程稱為解調。為了更好地利用通信信道的帶寬并使信號能夠傳送更大的距離 , 在數字載波通信中 ,我們采用了三種解調方式 : 幅移鍵控（ ASK）頻移鍵控（ FSK）和相移鍵控（ PSK）。調制信號為二進制信號 的調制稱為二進制數字調制 , 二進制調制又分為二進制幅移鍵控（ 2ASK）、二進制頻移鍵控（ 2FSK）、二進制相移鍵控（ 2PSK）和差分二進制相移鍵控（ 2DPSK）等多種基本的類型，本課題主要是數字頻率調制又稱頻移鍵控（ FSK）。同時利用 system view 軟件實現(xiàn)對 FSK 系統(tǒng)的仿真和分析，從而通過運用模擬的視覺化的手段來實現(xiàn)達到解調調制的目的。 關鍵詞 數字通信； FSK信號；非相干數字解調 Summary Along with society of continuously development, correspondence more and more show to us of for the correspondence technique, the quality of the correspondence also show very of of root mission is how assurance longdistance leave to deliver an information of accuracy, in this aspect numeral correspondence the system have inborn of main is because of numeral correspondence what to deliver be longlost in the system of numeral signal, because of the signal be longlost, drive Zao voice interference empress of signal want ～ only have no exceed threshold, receive to carry can plete with accuracy judgment the information for deliver。But for imitate to deliver system, as long as have a little bit of the interference will make the information creation for deliver exactly also because of so of reason, numeral correspondence system then can in everyone39。s noodles gradual replace imitate correspondence system to bee modern correspondence of the most basic the sake of easy to differentiation signal and Zao voice, make correspondence don39。t lose true with be free from interference, usually give diagraph signal to endow with with certain characteristic, this be the main function for is the signal(be called to carry a signal) which use a signal(be called to make signal) to carry a body to control39。s another a conduct and actions, let the latter of some characteristic parameter press the former measure signal to make again, and will it with Zao voice separate, after enlarge etc. processing, return want to withdraw reflection from have already make of the signal quilt measured value of measure signal, this process be called solution to bandwidth using correspondence letter way for the sake of better land utilization also make signal can transmission larger of distance, in the numeral carry the wave the correspondence, we adoption three kinds of solution adjust a way: Move key to control(ASK) Pin to move key to control(FSK) with mutually move key to control(PSK).Make signal be called binary system num
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