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研究生:應德臻
研究生(外文):Te-Chen Ying
論文名稱:用於正交分頻多工系統具延遲處理器的空時碼
論文名稱(外文):Space-Time Coding with a Delay Processor in Orthogonal Frequency Division Multiplexing System
指導教授:魏瑞益
指導教授(外文):Ruey-Yi Wei
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:88
中文關鍵詞:延遲處理器空時碼正交分頻多工
外文關鍵詞:OFDMdelay processorspace-time codingSTC
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在無線通道的編碼技術中,多元性與編碼增益是影響錯誤效能的兩個重要因素。我們在第二章中回顧具延遲處理器的籬柵碼與空時碼架構。正交分頻多工系統可以提供高的頻譜使用率,藉由加入循環字首有效克服信號與子載波之間的干擾。在第三章中,我們回顧在正交分頻多工系統的編碼技術並比較其性能。在第四章中,我們結合具有延遲處理器的籬柵編碼架構與正交空時區塊碼應用於正交分頻多工系統。此種編碼設計可以在頻域獲得更高的多元性,使每一個正交分頻多工系統的子載波有很強的抗衰減能力。在獲得相同的多元性前提下,此種編碼設計降低了解碼的複雜度。對於不同的多路徑衰退通道與不同的信號延遲擴散,我們可以使用重複性解碼、超籬柵解碼演算法與交錯器改善錯誤性能。
The diversity gain and coding gain are two important factors in wireless communications. We review the structures of trellis codes with a delay processor and space-time coding in chapter 2. The orthogonal frequency division multiplexing (OFDM) system can provide high spectral efficiency, and combat the interference between each OFDM symbol and the interference between each subcarrier in one OFDM symbol effectively. In chapter 3, we review two coded OFDM systems and compare their performance. In chapter 4, we concatenate space-time block coding with a delay processor and a signal mapper in OFDM system. We can get more diversity gains in frequency domain and enhance the abilities to resist fading in an OFDM symbol. The decoding complexities are decreased by the code design. We use iterative decoding, super trellis decoding and interleaving to improve the error performance for different number of resolvable paths and delay spreads.
Contents

1 Introduction 1

2 Reviews on Trellis Coding with a Delay Processor and Space-Time Coding 4
2.1 Set Partitioning 4
2.2 Trellis Coding Structure with a Delay Processor and a Signal Mapper 6
2.2.1 Encoding 6
2.2.2 Decoding 7
2.2.3 Super Trellis Decoding 10
2.3 The Space-Time Coding 11
2.3.1 Diversity 12
2.3.2 Space-Time Trellis Coding 13
2.3.3 Space-Time Block Coding 19

3 Code Design for Frequency Selective Channel in OFDM System 22
3.1 Introduction to OFDM System 22
3.2 Space-Time Trellis Coding for OFDM System 25
3.3 Concatenated Space-Time Block Coding with Trellis Coded Modulation for OFDM System 26

4 A New Space-Frequency Coded OFDM System in Frequency Selective Channel 30
4.1 Concatenated Space-Time Block Coding with A Delay Processor and A Signal Mapper for OFDM System 30
4.2 Simulation Results and Performance Analysis 34

5 Conclusions 86
Bibliography

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[2]G. Hellstern, “Coded modulation with feedback decoding trellis codes,” in Proc. IEEE Int. Conf. on Communications, Geneva, Switzerland, pp. 1071-1075, May 1993.

[3]J.Y. Wang and M.C. Lin, “On constructing trellis codes with large free distance and low decoding complexities,” IEEE Trans. Commun., vol. 45, no. 9, pp. 1017-1020, Sep 1997.

[4]Mao-Chao Lin, Yeong-Luh Ueng, and Jia-Yin Wang, “Two Trellis Coding Schemes for Large Free Distances,” IEEE Trans. Commun., vol. 48, no. 8, pp. 1286-1296, Aug 2000.

[5]Yeong-Luh Ueng, Chia-Jung Yeh, and Mao-Chao Lin, “On Trellis Codes with a Delay Processor and a Signal Mapper,” IEEE Trans. Commun., vol. 50, no. 12, pp. 1906-1917, Dec 2002.

[6]Chun-Yu Lu, “Super-trellis decoding for trellis codes with a delay/convolutional processor.” Master Thesis, National Central University, Jhongli, June 2003.


[7]“A new bandwidth efficient transmit antenna modulation diversity scheme for linear digital modulation,” in Proc. IEEE’ICC, 1993, pp. 1630-1634.

[8]S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE J. Select. Areas Commun., vol. 16, pp. 1451-1458, Oct. 1998.

[9]D. Agrawal, V. Tarokh, A. Naguib, and N. Seshadri, “Space-time coded OFDM for high data-rate wireless communication over wideband channels,” in Proc. IEEE VTC’98, May 1998, pp. 2232-2236.

[10]Y.Gong and K. B. Letaief, “Concatenated space-time block coding with trellis-coded modulation in fading channels,” IEEE Trans. Wireless Commun., vol. 1, pp. 580-590, Oct. 2002.

[11] Y.Gong and K. B. Letaief, “An efficient space-frequency coded OFDM system for broadband wireless communications,” IEEE Trans. Commun., vol. 51, pp. 2019-2029, Nov. 2003.

[12]B. Lu and X. Wang, “Space-time code design in OFDM systems,” in Proc. IEEE GLOBECOM’00, Nov. 2000, pp. 1000-1004.

[13]Z. Chen, B. Vucetic, J. Yuan and K. L. Lo, “Space-time Trellis Codes with Two, Three and Four Transmit Antennas in Quasi-Static Flat Fading Channels,” IEEE ICC New York, vol. 3, pp. 1589 -1595, May 2002.
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