數位電視通道解碼及解調變之實作

Implementation of DVB-T Channel Decoding and Demodulation

李卓澔(Cho-Hao Li)

指導教授 ： 尤信程

國立臺北科技大學/機電學院/資訊工程系所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00082

摘要

數位電視是這幾年非常熱門的話題，歐洲電信標準組織(ETSI)所制定的地面波標準(DVB-T)至今已被許多國家廣泛使用，也包括台灣在內。有鑑於數位電視之重要性，而目前實作之文獻較少，故本論文依照DVB-T (ETSI EN 300 744)之規範，將通道解碼及解變的技術以軟體方式實現，建立接收機相關知識。我們利用數位電視機上盒擷取目前現有的數位電視之中頻訊號，自行撰寫相關程式進行解碼，包括取樣頻率轉換、正交分頻多工的同步與解調變、通道估測與等化，以及解交錯、腓特比解碼器、里德索羅門解碼器…等。我們解碼進行到最後，可得到MPEG-2 Transport Stream，並且利用影音播放軟體播放其聲音及影像，確認程式之正確性。

關鍵字

DVB-T ； 正交分頻多工 ； 腓特比 ； 里德索羅門碼

並列摘要

The digit TV has become a hot topic in recent years. The European standard for digital video broadcasting over terrestrial(DVB-T) has already been adopted by a lot of countries, including Taiwan. To understand the technical details of the standard (ETSI EN 300 744), we decide to implement the DVB-T demodulator and channel decoder in software. We use existing DVB-T set-top box to get its intermediate frequency (IF) signal, which is digitized and stored in a PC. The program we write includes the following functions: sampling rate conversion, synchronization and demodulation for orthogonal frequency division multiplexing(OFDM), channel estimation and equalization, de-interleaving, Viterbi decoding, and Reed-Solomon decoding, etc. We finally obtain a MPEG-2 Transport Stream (TS). The TS can be decoded using a commercial media player. Thus, the correctness of our program is fully verified

並列關鍵字

DVB-T ； OFDM ； Viterbi ； Reed-Solomon

參考文獻

[34] 劉大興, “數位廣播接收機之實作,” 國立臺北科技大學碩士論文, 2004.

[8] Shu Lin, Costello J. Daniel, Error Control Coding, Prentice Hall Inc. 1983

[9] ETSI EN 300 401, Radio broadcast systems: Digital audio broadcasting to mobile portable and fixed receivers,v1.3.3,2001.

[10] Andrew J. Viterbi, “Error Bounds for Convolutional Codes and an Asymptotically Optimum Decoding Algorithm,” IEEE Transactions on Information Theory, Vol. IT-13, NO. 2, pp.260-269, Apr. 1967.

[11] S.B. WEINSTEIN, PAUL M. EBERT, “Data Transmission by Frequency-Division Multiplexing Using Discrete Fourier Transform,” IEEE Transactions on Communications, Vol. COM-19, No. 5, pp.628-634, Oct. 1971.