| DC 欄位 |
值 |
語言 |
| DC.contributor | 通訊工程學系 | zh_TW |
| DC.creator | 林主榮 | zh_TW |
| DC.creator | Chu-jung Lin | en_US |
| dc.date.accessioned | 2011-1-21T07:39:07Z | |
| dc.date.available | 2011-1-21T07:39:07Z | |
| dc.date.issued | 2011 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=975203053 | |
| 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 | 最近所提出以查表法運用在QAM的相差編碼可以有效降低差分編碼的複雜度與改善其錯誤效能。本篇論文以此做延伸，除了改善並找出16APSK與16TAPSK使用的最佳差分編碼表，更針對由2000年所提出的差分時空調變為其提出一種新的差分編碼方式，利用查表法以避免星座圖上的傳送符號發生擴展問題；此外，查表法的差分編碼等效於籬柵式的差分編碼，在差分檢測器的部分利用維特比演算法，藉由增加限制長度以改善錯誤效能，並提出一定理以降低在差分時空調變籬柵解碼的狀態數量。
| zh_TW |
| dc.description.abstract | Differential encoding by a look-up table for QAM was proposed recently. It can reduce complexity of differential encoding and improve the error performance. In this thesis, we find a better differential encoding table for 16APSK and 16TAPSK; moreover, we propose a new differential encoding method for differential space-time modulation (DSTM), which was proposed in 2000. The new differential encoding method uses a look-up table to avoid the expansion of the constellation of the transmitted signals; we show that, differential encoding by a table is equivalent to differential encoding by a trellis. We use the Viterbi algorithm at the differential detector, and increase truncation length to improve the error performance, and propose a theorem to reduce the number of states of the decoding trellis.
| en_US |
| DC.subject | 相差編碼 | zh_TW |
| DC.subject | 查表法 | zh_TW |
| DC.subject | look-up table | en_US |
| DC.subject | differential encoding | en_US |
| DC.title | 使用查表法相差編碼之進階結果 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Further results on differential encoding by a table | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |