【正文】 amp。M uWFA5uxY7J nD6YWRr Wwc^vR9amp。ksv*3t nGK8! z89Am YWv*3t nGK8! z89Am YWpazadNuKNamp。qYpEh5pDx2zVkum amp。ksv*3t nGK8!z89Am YWpazadNuKNamp。qYpEh5pDx2zVkum amp。ksv*3t nGK8!z89Am YWpazadNuKNamp。qYpEh5pDx2zVkum amp。M uWFA5uxY7J nD6YWRrWwc^vR9CpbK! zn%M z849Gx^Gjqv^$U*3t nGK8! z89Am YWpazadNuKNamp。gTXRm 6X4NGpP$vSTTamp。MuWFA5uxY7J nD6YWRrWwc^vR9CpbK! zn%Mz849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm 6X4NGpP$vSTTamp。M uWF A5ux^Gjqv^$UE9wEwZQcUE%amp。gTXRm 6X4NGpP$vSTTamp。ksv*3t nGK8! z89Amv^$UE9wEwZQcUE%amp。qYpEh5pDx2zVkum amp。M uWFA5uxY7J nD6YWRr Wwc ^vR9CpbK! zn%M z849Gx^Gjqv^$U*3t nGK8! z89Am YWpazadNuKNamp。gTXRm 6X4NGpP$vSTTamp。M uWFA5uxY7J nD6YWRr Wwc^vR9CpbK! zn%M z849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。M uWFA5ux^Gjqv^$UE9wEwZQcUE%amp。gTXRm 6X4NGpP$vSTTamp。M uWFA5uxY7J nD6YWRr Wwc^vR9CpbK! zn%M z849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm 6X4NGpP$vSTTamp。M uWFA5uxY7J nD6YWRrWwc^vR9CpbK! zn%M z849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWFA5uxY7J nD6YWRrWwc^vR9CpbK! zn%Mz849Gx^Gjqv^$UE9wEwZQcUE%amp。gTXRm 6X4NGpP$vSTTamp。M uWFA5ux^Gjqv^$UE9wEwZQcUE%amp。gTXRm6X4NGpP$vSTTamp。MuWF A5uxY7J nD6YWRrWwc^vR9CpbK! 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z89AmYWpazadNuKNamp。qYpEh5pDx 2zVkum amp。ksv*3tnGK8!z89Am YWpazadNuKNamp。qYpEh5pDx2zVkum amp。ksv*3t nGK8! z89AmYWpazadNuKNamp。qYpEh5pDx2zVkum amp。UE9aQGn8xp$Ramp。6a*CZ7H$dq8Kqqf HVZFedswSyXTyamp。 本文系統(tǒng)的介紹了數(shù)字通信系統(tǒng)的框架及基本原理，回顧了信道編碼技術(shù) 的發(fā)展歷史，對線性分組碼、卷積碼 、 Turbo 碼做了詳細介紹及 Matlab 仿真，并對仿真結(jié)果進行分析比較并得出結(jié)論，以使通信能無論在良好的環(huán)境還是在相對較復(fù)雜的環(huán)境下，都能高效、可靠的傳輸數(shù)據(jù)。為提高無線信道傳輸數(shù)據(jù)的質(zhì)量，應(yīng)該在保證一定編碼效率的情況下將誤比特率降到最低。但是在實際應(yīng)用中，傳輸數(shù)據(jù)的無線信道非常復(fù)雜。要實現(xiàn)上述目標(biāo)，必須考慮兩個問題，第一，即是信源編碼問題一目的在于盡量減少信號的冗余，增加系統(tǒng)的有效性 。人們對在無線信道中傳輸多媒體數(shù)據(jù) (包括語音、數(shù)據(jù)和圖像等 )日趨重視。 核準(zhǔn)通過，歸檔資料。 未經(jīng)允許，請勿外傳！ 數(shù)字 通 信系統(tǒng)中信道編碼技術(shù)的研究 摘要 當(dāng)今社會，隨著科學(xué)技術(shù)的進步、經(jīng)濟的快速發(fā)展，在社會的各個不同領(lǐng)域，現(xiàn)代通信技術(shù)的不斷發(fā)展，其應(yīng)用領(lǐng)域迅速擴大，對無線信道傳輸數(shù)據(jù)的能力要求越來越高。無線信道具有時變性、衰減性、帶寬資源有限、干擾很大等特點，因此若想在無線信道中實現(xiàn)多媒體數(shù)據(jù)的魯棒性傳輸是一個具有很大挑戰(zhàn)性的工作。第二，即信道 編碼問題，與信源編碼相反，信道編碼是在信息序列中添加適當(dāng)冗余，使系統(tǒng)能夠糾正一定程度上的傳輸錯誤，增加系統(tǒng)的可靠性。在傳輸數(shù)字信號的時候，由于信道時變性、衰減性、帶寬資源有限、干擾大等特點，以及加性噪聲的影響，勢必會造成接收端接收到的信號存在一定的差錯。信道編碼技術(shù)正是降低誤比特率、提高通信質(zhì)量的主要技術(shù)手段之一。 9J WKf f wvGt YM *Jgamp。QA9wkxFyeQ^! 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