博碩士論文 91523055 詳細資訊




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姓名 楊鈞偉(Chun-Wei Yang)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 具延遲處理器的空時碼之軟式輸入輸出遞迴解碼
(Soft-Input/Soft-Output Iterative Decoding for Space-Time Coding With a Delay Processor)
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摘要(中) 在無線通道的編碼技術中,多樣性與編碼增益是影響錯誤效能的兩大重要因素。最近,結合具有延遲處理器的籬柵編碼調變與正交空時區塊碼的架構被提出,這個架構可以在窄頻的半平穩衰退通道與寬頻的正交分頻多工衰退通道中有效率的獲得全多樣性並且同時擁有好的編碼增益。之前對於這個架構所作的解碼是使用硬式輸出遞迴解碼,為了獲得更好的效能,在本篇論文中,我們使用軟式輸入輸出遞迴解碼,並將此架構與位元交錯編碼調變作比較。
摘要(英) The diversity gain and coding gain are two important factors in wireless communications. Recently, the scheme that concatenates space-time block coding with trellis coded modulation with a delay processor is proposed, which can efficiently achieve the full diversity and also obtain good coding gain for the narrowband quasi-static fading channels and the wideband OFDM fading channels. The decoding way for this scheme was a hard-output iterative decoding previously. In order to further improve the error performance, we use the soft-input /soft-output iterative decoding in this thesis and compare it with the BICM scheme.
關鍵字(中) ★ 籬柵編碼調變
★ 延遲處理器
★ 軟式輸入輸出遞迴解碼
★ 多樣性
★ 空時碼
關鍵字(英) ★ space-time code
★ soft-input/soft-output (SISO) iterative decoding
★ trellis coded modulation
★ delay processor
★ diversity
論文目次 1 Introduction 1
2 Reviews on Space-Time Coding and Trellis Coding with a Delay Processor 4
2.1 Space-time Coding 4
2.1.1 Diversity 5
2.1.2 Space-Time Block Coding 6
2.1.3 Space-Time Trellis Coding 8
2.2 Trellis Coded Modulation 11
2.3 Concatenated Space-Time Block Coding With Trellis Coded Modulation 13
2.4 Trellis Coding Structure with a Delay Processor and a Signal Mapper 15
2.4.1 Encoder 15
2.4.2 Hard Decoder 16
2.4.3 Soft Decoder 19
3 Space-Frequency Coded OFDM Systems for Frequency-Selective Channels 24
3.1 The OFDM System and SF Coded OFDM System Model 24
3.2 Concatenated Space-Time Block Coding with Trellis Coded Modulation for OFDM Systems 27
3.3 A New Scheme for Large Diversity 31
4 Soft-Input/Soft-Output Iterative Decoding for Space-Time Coding With a Delay Processor 34
4.1 Concatenated Space-Time Block Coding with A Delay Processor and A Signal Mapper 34
4.2 Simulation Results and Performance Analysis 37
5 Conclusions 69
參考文獻 [1] R.Y. Wei, Y.L. Wu, and Y.L. Ueng, “Two space-frequency schemes for large diversity,” in Proc. IEEE Vehicular Technology Conference (VTC) Spring, Stockholm, May 2005.
[2] 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.
[3] S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE J. Select. Areas Commun., vol. 16, pp. 1451-1458, Oct. 1998.
[4] V. Tarokh, H. Jafarkhani, and A.R. Calderbank, “Space-time block codes for orthogonal designs,” IEEE Trans. Inform. Theory, vol. 49, pp. 1456-1467, July 1999.
[5] G. Hellstern, “Coded modulation with feedback decoding trellis codes,” in Proc. IEEE Int. Conf. on Communications, Geneva, Switzerland, pp. 1071-1075, May 1993.
[6] Y. L. Ueng, C. J. Yeh and M. C. Lin, “On trellis codes with a delay processor and a signal mapper,” IEEE Trans. Commun., vol. 50, pp. 1906-1917, Dec. 2002.
[7] Z. Hong and B. Hughes, “Robust space-time codes for broadband OFDM systems,” in Proc. IEEE WCNC'02, Mar. 2002, pp 105-108.
[8] 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.
[9] A. Wittneben, “A new bandwidth efficient transmit antenna modulation diversity scheme for linear digital modulation,” in Proc. IEEE’ICC, 1993, pp. 1630-1634.
[10] V. Tarokh, N. Seshadri and A.R. Calderbank, “Space-time codes for high data rate wireless communication : Performance criterion and code construction,” IEEE Trans. Inform. Theory, vol. 44, pp. 744-765, Mar 1998.
[11] S. M. Alamouti, V. Tarokh and P. Poon, “Trellis coded Modulation and transmit diversity: Design criteria and performance evaluation,” in Proc. IEEE ICUPC`98, Oct. 1998, pp.703-707.
[12] S. Benedetto, D. Divsalar, G. Montorsi, and F. Pollara, “Soft-output decoding algorithms for continuous decoding of parallel concatenated convolutional codes,” in Proc. IEEE ICC’96, June 1996, pp. 23–27.
[13] P. Robertson, E. Villebrun, and P. Hoeher, “A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain,” in Proc. IEEE ICC’95, June 1995, pp. 1009–1013.
[14] Chun-Yu Lu, “Super-trellis decoding for trellis codes with a delay/convolutional processor.” Master Thesis, National Central University, Jhongli, June 2003.
[15] E. Zehavi, “8-PSK trellis codes for a Rayleigh channel,” IEEE Trans. Inform. Theory, vol. 40, pp. 873-884, May 1992.
[16] S. Lin and D.J. Costello Jr., Error Control Coding: Fundamentals and Applications. Englewood Cliffs, NJ: Prentice-Hall, 1983.
[17] Z. Hong and B. Hughes, “Bit-interleaved space-time coded modulation with iterative decoding,” IEEE Trans. Wireless Commun., vol. 3, pp 1912-1917, Nov. 2004.
指導教授 魏瑞益(Ruey-Yi Wei) 審核日期 2005-7-12
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