- 學位論文
降低Tomlinson Precoding編碼系統平均傳送必v的設計
Several Designs for Reduced-Power Coded Tomlinson Precoding Systems
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摘要
TH預編碼(Tomlinson-Harashima precoding)是將等化器(equalizer)放在通訊系統的發射端(transmitter)的技術，如此可避免雜訊經過等化器而被放大；在有線通道(wireline channels)中的應用中，對於消除符號的互相干擾(intersymbol interference, ISI)有非常好的效果，且被廣泛的使用在數位用戶(digital subscriber line, DSL)。不過TH預編碼系統中，由於有回授之設計，此回授效應會造成輸出信號大小會在某一範圍之內作均勻分佈。 在本篇論文中，我們將研究在編碼系統中降低TH預編碼傳輸平均必v的問題，用一些方法去得到較小平均必v；例如籬柵整型(trellis shaping)的方法，數種擬隨機序列(pseudo-random sequence)打亂資料，藉此挑選其中較小平均必v的方法，多組錯開器(Multi-Interleaver)的方法，並比較其優劣。
並列摘要
Tomlinson-Harashima precoding is the equalizer technique for eliminating intersymbol interference with the channel response known by the transmitter. By placing equalizer at the transmitter side of the communication system, the intersymbol interference can be completely eliminated without noise enhancement. However, the Tomlinson- Harashima precoding has two defects. The First is called data flipping, which occurs when the amplitude of the received signal is large and the modulo 2M operation causes the sign change. The Second, due to the feedback design of Tomlinson-Harashima precoding, the output amplitude become uniformly distribution, so that transmitted power is increased. In this thesis, we will focus on the second problem. We consider the usage of several methods to lower the average output power. The considered methods include trellis shaping proposed by Forney, a method of using maximum-length sequence, and Multi-Interleaver method. We will compare above methods at last.
參考文獻
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[3] M. Tomlinson, “New automatic equalizer employing modulo arithmetic,” Electron Lett. , vol. 7, pp. 138-139, March 1971.
[4] H. Miyakawa and H. Harashima, “Matched-Transmisson techniques for channels with intersymbol interference, “IEEE Trans. Commun., vol. COM-20, pp.774-780, August 1972.
[5] Ghia-Hsiea Lin, “Some Designs for communication systems on channels with intersymbol interference,” M.Sc. thesis. National Taiwan University, July 2001.
[6] K.C. Chen, “Some designs of Turbo coded OFDM with PAPR reduction.” M.Sc. thesis. National Taiwan University, July 2002.