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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8074


    Title: 數位電視地面廣播系統通道解碼之腓特比解碼器實現;Viterbi Decoder Hardware Implementation for Digital Video Broadcasting Standard for Terrestrial Transmission (DVB-T) Channel Coding
    Authors: 許國偉;Kuo-Wei HSU
    Contributors: 通訊工程研究所
    Keywords: 通道解碼;內部交錯器;數位電視;腓特比解碼器;軟判決解碼;Soft decision;Viterbi decoder;DVB-T;channel coding;inner interleaver
    Date: 2005-07-06
    Issue Date: 2009-09-22 11:17:25 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 摘 要 迴旋碼的解碼法則中,以最大相似解碼法則---腓特比演算法為公認的有效率之近似解碼演算法。本文主要是針對數位電視地面廣播系統中所訂定的間空迴旋碼,希望設計實現出一個符合系統解碼速度的腓特比解碼器,且研究於軟判決的解碼方式,以希望提升錯誤保護之能力。 軟判決解法方式,是依照最大相似解碼法則衍生出最小距離法則,再按照量化位階的不同給予不同的分支路徑計量値,本論文內分析比較硬判決以及軟判決量化位階為Q=8、Q=16的效能,且提供硬體實現上,參數設定的依據。硬體實現上,比較不同的實作方式,採用全平行的架構,為了能夠更加快速度且節省資源,使用模數歸一的正規化方式;最後,以較簡單的3-指標偶數區塊追溯法來完成整個解碼器。在計算分支路徑計量値時,使用量化位階為Q=16的方式。 ABSTRACT Viterbi algorithm is the well-known and efficiently maximum likelihood decoding algorithm applied to decode convolutional code. In this discussion, it concentrates on the standard of punctured convolutional encoder in DVB-T system. To design and implement a Viterbi decoder agreed with the decoding throughput which limited by the system, on the other hand, to research the soft-decision method for decoding process with the result in promoting the bit error rate! The way used to soft-decision is by the minimum distance algorithm . Bit branch metrics have different value if the quantized level is not the same for soft-decision decoding. The analysis is focusing on the performance of soft-decision quantized level Q=8 and Q=16 and hard-dec ision and a basis for the coming IC design of Viterbi decoder. In the implementation issue, full parallel architecture and modulo normalization are used to save the source and decoding throughput, then the 3-pinter even block method is used to trace back and decoding the data. At the last, we implement the Viterbi decoder by above-mentioned ways and the soft-decision quantized level is Q=16.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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