博碩士論文 955203034 詳細資訊




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姓名 張雅茹(Ya-ru Jhang)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 以符元交錯及訓練基礎的籬柵編碼非同調空時調變
(Training-Based Symbol-Interleaved Trellis Coded Noncoherent Space-Time Modulation)
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摘要(中) 下一代通信系統對於高傳輸率及高機動性的要求以非常快之速度成長,空時碼是目前無線通信系統最有效克服衰減之技術及提供高可靠之傳輸。么正空時調變是一種在傳送天線及接收天線都不需知道通道狀態資訊之非同調空時碼;籬柵編碼么正空時調是一種用於區塊衰減通道的空時碼,其可以得到重大的編碼增益;之前的論文提出訓練基礎的籬柵編碼非同調空時調變,適當運用交錯器,將一個籬柵支脈上之空時碼打散在不同衰減區塊上,藉此可增加時間分集,因而於高訊號雜訊比時可得到非常好的效能。
本論文提出一個新的籬柵編碼非同調空時調變,以訓練碼和符元交錯的方式,將一個籬柵支脈上之符元訊號打散在不同衰減區塊上,比起之前的論文可以獲得更大的時間分集增益。我們使用電腦去搜尋出使架構具有最佳位元錯誤率的生成矩陣。模擬結果證實此架構因具有較大的分集增益,因而於高訊號雜訊比時比起之前的論文有著較佳的符元錯誤機率。
摘要(英) The main goal of the next generation wireless communication systems provides
high data rates and high mobile service for the Internet and multimedia applications.
Space-time coding was one of the most effective techniques to combat fading and to provide high reliable transmission. A noncoherent space-time code named unitary space-time modulation(USTM) in which the transmit and the receive antennas do not know the channel state information; trellis coded USTM for the noncoherent block fading channel can obtain signigicant coding gains; the reviewed scheme proposed a training-based trellis coded noncoherent space-time modulation scheme by properly interleaving space-time signals for the block fading channels. This scheme can enlarge temporal diversity at the price of increased complexity and delay thus can have good performance at high SNR.
In this thesis, we propose a scheme of training-based trellis coded noncoherent space-time modulation which has larger diversity gains by training-basing and symbol-interleaving for the block fading channels. We utilize computers to search the best generator matrix which let the proposed scheme have the best BER. Simulation results confirm that our scheme has larger diversity thus has better BER at high SNR than the reviewed scheme.
關鍵字(中) ★ 空時碼
★ 么正空時調變
★ 籬柵碼
關鍵字(英) ★ Unitary space-time modulation
★ Space-time code
★ Trellis code
論文目次 第一章 序論----------------------------------------------1
1.1 前言---------------------------------------------1
1.2 研究動機-----------------------------------------1
1.3 論文架構-----------------------------------------2
第二章 回顧----------------------------------------------3
2.1 空時區塊碼---------------------------------------3
2.2 么正空時調變-------------------------------------8
2.2.1 系統模型----------------------------------8
2.2.2 最大可能性解碼器-------------------------10
2.2.3 成對錯誤機率-----------------------------11
2.2.4 么正空時調變的建構----------------------12
2.3 籬柵編碼非同調空時調變--------------------------16
2.3.1 系統模型---------------------------------16
2.3.2 既有的籬柵編碼么正空時調變架-------------17
2.4 以訓練基礎的籬柵編碼非同調空時調變------------------18
第三章 以符元交錯及訓練基礎的籬柵編碼非同調空時調變-----26
3.1 系統架構----------------------------------------26
3.2 模擬環境----------------------------------------34
3.3 模擬結果----------------------------------------36
第四章 結論---------------------------------------------57
參考文獻-------------------------------------------------58
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[2]V. Tarokh, H. Jafarkhani and A. R. Calderbank,“Space-time block codes from orthogonal designs,”IEEE Trans. Inform. Theory, vol. 45, pp. 1456-1467, July 1999.
[3]V. Tarokh, N. Seshadri, and A. R. Calderbank, "Space-time codeds for high data rate wireless communication: Performance criterion and code construction," IEEE Trans. Inform. Theory, vol. 44, pp. 744-765, Mar. 1998.
[4]V. Tarokh, H. Jafarkhani, and A. R. Calderbank, "Space-time block codes from orthogonal designs," IEEE Trans. Inform. Theory, vol. 45,pp. 1456-1467, July. 1999.
[5]B. M. Hochwald and T. L. Marzetta, ‘‘Unitary space-time modulation for multiple-antenna communication in Rayleigh flat fading,’’ IEEE Trans. Inform. Theory, vol. 46, pp. 543-564, Mar. 2000.
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[10]B. Hochwald and W. Swelden, “Differential unitary space-time modulation,” IEEE Trans. Commun. vol. 48, pp. 2041-2052, Dec. 2000
[11]I. Bahceci and T. Duman, “Trellis coded unitary space-time modulation,” IEEE Trans. Wireless Commun., vol. 3, pp. 2005-2012, Nov. 2004.
[12]W. Zhao, G. Leus, and G. B. Giannakis, “Orthogonal design of unitary constellations for uncoded and trellis-coded noncoherent space-time systems,” IEEE Trans. Inform. Theory, vol. 50, pp. 1319-1327, June 2004.
[13]Z. Sun and T. T. Tjhung, “On performance analysis and design criteria for trellis coded unitary space-time modulation,” in Proc. IEEE WCNC, Mar. 2003, pp. 262-267.
[14]G. Ungerboeck, “Channel coding with multilevel/phase signals,” IEEE Trans. Inform. Theory, vol. IT-28, pp. 55-66, Jan. 1982.
[15]Ruey-Yi Wei and Y. L. Wu, ‘‘On trellis coded noncoherent space-time modulation,’’ IEEE Transactions on Wireless Communications, vol. 6, no. 7, pp. 2432-2437, July 2007.
[16]P. Dayal, M. Brehler, and M. K. Varanasi, “Leveraging coherent space-time codes for noncoherent communication via training,” IEEE Trans. Inform. Theory, vol. 50, pp. 2058-2080, Sep. 2004.
指導教授 魏瑞益(Ruey-Yi Wei) 審核日期 2009-1-19
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