The code synchronization pulse brought from code synchrolock has the synchronization benchmark heart function in the demodulation processing . at the same time , it is the base of frame demodulation and datum processing 位同步器產(chǎn)生的位同步信號起著遙測解調(diào)處理“同步基準(zhǔn)”的關(guān)鍵作用,是后續(xù)幀格式解調(diào)和數(shù)據(jù)處理的基礎(chǔ)。
The paper proposes a new kind of continuous wavelet transform and processing circuits where the wavelet transform is fulfilled by demodulation process . we analyze its primary circuits , and its pspice simulations indicate a wide dynamic range employed by low - voltage and low - power 文中詳細探討了一維連續(xù)小波變換的對數(shù)域電路的實現(xiàn)方式,提出了一個利用復(fù)解調(diào)技術(shù)的小波變換電路,利用pspice軟件對其中的主要模塊進行了分析和仿真。
It is necessary that the receiver tracks the acquired signals steadily and credibly to ensure the successful demodulation process . in this thesis , an improved tracking loop design method is presented which adopts self - adaptation parameters and varied bandwidth tracking technique to adapt to the input signals , and improves the acquisition and tracking performance 接收機穩(wěn)定可靠地跟蹤被捕獲信號保證成功解調(diào)是必要的,本文介紹一種改善的鎖相環(huán)設(shè)計方法,這種方法采用自適應(yīng)參數(shù)和變帶寬跟蹤技術(shù)來調(diào)整輸入信號改善捕獲和跟蹤性能。
This thesis begins with hfc network theory and docsis , analyses modulation / demodulation process of data communication in hfc . then , several theories are analysed including qam ( quadrature amplitude modulation ) , nyquist root square filter , fec ( forward error correction ) , map ( bandwidth allocation map ) . and digital signal transmission involved the other important international standard ? itu - t j . 83 annex a / b , is discussed 本文從hfc網(wǎng)絡(luò)理論和docsis協(xié)議入手,分析了hfc數(shù)據(jù)通信的調(diào)制解調(diào)過程,對qam調(diào)制、奈奎斯特均方根濾波器、前向糾錯( forwarderrorcorrection ,簡稱fec ) 、 map通信等進行了闡述;還從中探討了電纜調(diào)制解調(diào)器需要用到的另一個國際標(biāo)準(zhǔn)ituj . 83annexa / b所設(shè)計的mpeg信號的數(shù)字傳輸。