| DC 欄位 |
值 |
語言 |
| DC.contributor | 通訊工程學系 | zh_TW |
| DC.creator | 許國偉 | zh_TW |
| DC.creator | Kuo-Wei HSU | en_US |
| dc.date.accessioned | 2005-7-15T07:39:07Z | |
| dc.date.available | 2005-7-15T07:39:07Z | |
| dc.date.issued | 2005 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=92523010 | |
| dc.contributor.department | 通訊工程學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.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。 | zh_TW |
| dc.description.abstract | 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. | en_US |
| DC.subject | 通道解碼 | zh_TW |
| DC.subject | 內部交錯器 | zh_TW |
| DC.subject | 數位電視 | zh_TW |
| DC.subject | 腓特比解碼器 | zh_TW |
| DC.subject | 軟判決解碼 | zh_TW |
| DC.subject | Soft decision | en_US |
| DC.subject | Viterbi decoder | en_US |
| DC.subject | DVB-T | en_US |
| DC.subject | channel coding | en_US |
| DC.subject | inner interleaver | en_US |
| DC.title | 數位電視地面廣播系統通道解碼之腓特比解碼器實現 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Viterbi Decoder Hardware Implementation for Digital Video Broadcasting Standard for TerrestrialTransmission (DVB-T) Channel Coding | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |