| 研究生: |
黃俞豪 Yu-Hau Huang |
|---|---|
| 論文名稱: |
多重符號相差編碼 Multiple-Symbol Differential Encoding |
| 指導教授: |
魏瑞益
Ruey-Yi Wei |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
資訊電機學院 - 通訊工程學系 Department of Communication Engineering |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 62 |
| 中文關鍵詞: | 相差編碼 、多重符號 |
| 外文關鍵詞: | Differential Encoding, Multiple Symbol |
| 相關次數: | 點閱:15 下載:0 |
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最近有一種新的相差編碼器被提出,它是藉由查表法所得到。本篇論文以此一主題,建立各種星座圖的多重符號相差編碼,並使最小非同調距離最大化。除此之外,查表法的相差編碼可以被描述成籬柵式的相差編碼,因此,我們在相差檢測器可以使用維特比(Viterbi)演算法以改善錯誤效能。並且也利用一定理來降低籬柵解碼時的狀態數量。此外,也使用決策回授與集合分割降低在多重符號相差解碼的籬柵複雜度。
Recently, a new differential encoder by a look-up table was proposed. In this thesis, we construct tables of multiple-symbol differential encoding for various constellations that maximize the minimum noncoherent distance. Because differential encoding by a table can be described as differential encoding by a trellis, we use the Viterbi algorithm at the differential detector to improve the error performance. We use a theorem to reduce the number of states of the decoding trellis. Besides, we use decision feedback and set partition to decrease the trellis complexity of multiple-symbol differential decoding.
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