以電腦搜尋之短非同調區塊碼

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姓名

謝佩恩(Pei-en Hsieh) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

以電腦搜尋之短非同調區塊碼
(Short Noncoherent Block Codes Searched by Computers)

相關論文

★ 全像光資訊儲存系統的編解碼	★ 具有快速改變載波相位之籬柵編碼MPSK 的非同調解碼
★ 用於非同調解碼之多層次編碼調變	★ 么正空間時間籬柵碼之解碼演算法
★ 由多層次編碼所架構之非同調碼	★ 用於非同調檢測之與空時區塊碼連結的區塊編碼調變
★ 用於正交分頻多工系統具延遲處理器的空時碼	★ 用於非同調區塊編碼MPSK之A*解碼演算法
★ 在塊狀衰退通道上的籬柵么正空時調變	★ 用於非同調區塊編碼MPSK之Chase演算法
★ 使用決定回授檢測之相差空時調變的一種趨近同調特性	★ 具延遲處理器的空時碼之軟式輸入輸出遞迴解碼
★ 用於非同調區塊編碼MPSK的最大可能性解碼演算法	★ 具頻寬效益之非同調調變
★ 非同調空時渦輪碼	★ 循環字首及補零正交分頻多工系統經預編碼後之頻譜比較

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摘要(中)

幾種非同調區塊編碼架構，包括使用八點相位鍵移(8PSK)、八點扭轉振幅相位鍵移(8TAPSK)、十六點扭轉振幅相位鍵移(16TAPSK)及十六點的正交振幅調變(16QAM)非同調區塊編碼都已經被提出。但是這些區塊編碼架構在短的區塊無法得到令人滿意的錯誤效能，主要原因為這些有架構的碼在短的區塊所得到的最小非同調距離太小。本篇論文根據非同調距離去搜尋短的非同調區塊碼，由於短區
塊碼的碼字個數不會太多，在非同調接收端可以將碼字一個一個測試，所以我們考慮沒有結構的碼，使用幾種演算法尋找一群碼字來組成碼，讓它具有大的最小非同調距離，並經由最佳的位元對應來得到較低的位元錯誤率，模擬結果亦顯示這種沒有架構的區塊碼有較好的錯誤效能。
本篇論文藉由參考查表法相差編碼，我們使用另外一種建立相差編碼表的方式來解決多個點數不易建成群組數較少的相差編碼表的問題。本篇論文對於三十二點的正交振幅調變(32QAM)建立出16 個群組數的相差編碼表，它與相差編碼十六點的正交振幅調變(16QAM)的表具有相同群組數。藉由本研究提出的方法產生16 群組的三十二點的正交振幅調變(32QAM)相差編碼表，與相差編碼十六點的正交振幅調變(16QAM)比較，可得到較大的最小非同調距離及較好的錯誤效能。

摘要(英)

Many noncoherent block coding schemes were proposed, such as using noncoherent block-coded 8PSK(NBC-8PSK), noncoherent block-coded Twisted amplitude and phase shift keying using eight signal point(NBC-8TAPSK), NBC-16TAPSK, and noncoherent block-coded quadrature amplitude
modulation(16QAM). When the block length is very small, these schemes perform worse due to their small minimum noncoherent distance. In this thesis, we use computers to search short noncoherent block codes according to the noncoherent distance. Because the number of codeword is less, the noncoherent receiver can test the codeword one-by-one. The unstructured codes were composed from the
codewords by several algorithms and their minimum noncoherent distance was longer. Additionally, we got the lower bit error rate by the optimum bit mapping. The results showed that the unstructured block code perform better.
In this study, based on differential encoding by a look-up table, the varied differential encoding table was developed and solved that multiple points difficultly
produce differential encoding table with less group. In this study, we constructed the differential encoding table for 32QAM and the table included sixteen groups. The
number of groups is the same with the number of differential encoding table for 16QAM. The results showed that the differential encoder for 32QAM has larger minimum noncoherent distance and better error performance than the differential encoder for 16QAM.

關鍵字(中)

★ 非同調區塊碼

關鍵字(英)

★ noncoherent block codes

論文目次

論文摘要................................................. I
Abstract ................................................II
誌謝.....................................................IV
目錄......................................................V
圖表目錄.................................................VI
第一章緒論.............................................. 1
1.1 介紹................................................. 1
1.2 研究動機............................................. 2
第二章回顧............................................... 3
2.1 通道模型及非同調接收器................................3
2.2 非同調區塊編碼之回顧................................. 5
第三章以電腦搜尋之短非同調區塊碼........................ 11
3.1 碼搜尋演算法及其結果................................ 11
3.1.1 演算法............................................ 11
3.1.2 搜尋之結果........................................ 15
3.2 不限定星座圖之碼設計方法............................ 40
3.3 最佳位元對應(bit mapping)演算法 .................... 43
3.2.1 人工位元對應之方法................................ 43
3.2.2 以電腦實行位元對應演算法.......................... 45
3.4 模擬結果............................................ 46
第四章相差編碼.......................................... 52
4.1 區塊碼使用16PSK 星座圖搭配相差編碼 ................. 52
4.1.1 相差編碼方式...................................... 52
4.2 相差編碼查表法...................................... 54
4.3 使用補碼字演算法建構相差編碼表...................... 55
4.3.1 16APSK 與16TAPSK 相差編碼表 ...................... 55
4.3.2 32QAM 建立16 個群組相差編碼 ...................... 59
第五章結論.............................................. 62
參考文獻................................................ 63

參考文獻

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指導教授

魏瑞益(Ruey-Yi Wei)

審核日期

2011-7-11

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