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Title: | 使用區碼記憶之渦輪編碼多輸入多輸出天線系統 Turbo Coded MIMO Using Interblock Memory |
Authors: | Chung-Li Wang 王仲立 |
Advisor: | 林茂昭(Mao-Chao Lin) |
Keyword: | 區碼記憶,渦輪碼,多輸入多輸出,遞迴解碼, interblock memory,turbo codes,multiple-input multiple-output,iterative decoding, |
Publication Year : | 2006 |
Degree: | 碩士 |
Abstract: | Ashikhmin等人提出了在多輸入多輸出衰變通道中運作的低密度同位檢查編碼傳輸系統,在編碼長度大於十萬個位元時可以有貼近通道容量的效能。可是,這個系統在編碼長度小於一萬個位元時變的難以運用。在陳彥凱的碩士論文中密度同位檢查編碼傳送系統加上區碼記憶的系統在某些短碼時可以超越沒有區碼記憶的系統。在這篇論文中,我們在渦輪編碼多輸入多輸出傳輸架構上使用區碼記憶。首先,我們先簡單描述如何應用區碼記憶在渦輪編碼多輸入多輸出傳輸系統。重點擺在接收端的偵測方法。雖然外部訊息圖的分析在長碼時比較準確,但我們經由分析在外部訊息圖中,反映射器的轉移特徵曲線,依然可以解釋所提出架構的優點。最後,我們用各種天線數設定之下的模擬結果證實之前的推論。模擬結果顯示當編碼長度比較小時使用這個技術可以有很大的效能提升。 In a paper authored by Ashikhmin, et. al., a low-density parity-check (LDPC) coded transmission scheme operated on multiple-input multiple-output (MIMO) fading channel was proposed, which can achieve capacity-approaching performance in case the code length is 100000 bits. Nevertheless, this scheme is difficult to use in case the code length is shorter than 10000 bits. According to Chen’s master thesis, LDPC coded MIMO using interblock memory outperform LDPC coded MIMO without interblock memory in some short code-length conditions. In this paper, we apply interblock memory to the turbo coded MIMO transmission system. First, a short description of applying interblock memory to turbo coded MIMO transmission system is given. We focus on the detection methods for the receiver scheme. Then we can explain the advantage of the proposed turbo coded MIMO by analyzing demapper transfer characteristics in Extrinsic Information Charts (EXIT charts), although EXIT charts usually works well only in the condition of long code length. Finally, our proposed schemes are verified by simulation results for various transmission antenna settings. The simulation results show that the proposed technique provides significant advantage in case that the code is short. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/34811 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
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