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研究生:廖哲瑩
研究生(外文):Che-Ying Liao
論文名稱:中繼站網路中使用分散式正交與半正交空時區塊碼考慮四個中繼站嵌入放大傳送/解碼傳送矩陣元素
論文名稱(外文):Distributed Orthogonal and Quasi-Orthogonal Space Time Block Code with Embedded AAF/DAF Matrix Elements in Wireless Relay Networks with Four Relays
指導教授:曾恕銘
口試委員:張立中曾德峰陳永芳
口試日期:2012-07-06
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
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:2012
畢業學年度:100
語文別:英文
論文頁數:23
中文關鍵詞:合作式通訊系統分散式半正交空時區塊碼放大傳送解碼傳送
外文關鍵詞:Cooperative NetworksCooperativeDistributedDQOSTBCQOSTBCDAFAAF
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考慮1個傳送端,4個中繼站和1個接收端的合作式通訊系統中,都是單一天線。在這四個中繼站中使用所提出全速率分散式半正交空時區塊碼架構。若傳送端至中繼站間通道狀況大於或等於決策值時,選擇解碼傳送形式為分散式半正交空時區塊碼矩陣元素,反之,若傳送端至中繼站間通道狀況小於決策值時,則選擇放大傳送形式做為分散式半正交空時區塊碼矩陣元素,因此,本篇所提出為分散式正交與半正交空時區塊碼嵌入放大傳送/解碼傳送矩陣元素。
在模擬結果顯示,所提出的分散式半正交空時區塊碼架構相較於傳統分散式半正交空時區塊碼(矩陣元素皆為解碼傳送形式)在位元錯誤率10-3可以得到7dB的增益,因為傳統分散式半正交空時區塊碼在接收資訊發生錯誤時,會將低分集。我們所提出的速率1分散式半正交空時區塊碼優於速率1/2分散式正交空時區塊碼架構在相同頻譜效益2 bits/sec/Hz大約2dB的增益。

We consider the cooperative networks of one source, four relays, and one destination. Each of them has single antenna. The four relays use a proposed full rate distributed quasi orthogonal space time block code (DQOSTBC) scheme.
If the channel state between the source and a relay is above a threshold, we select the elements of the DQOSTBC matrix to be the decoded and forward (DAF) type. If below the threshold, the corresponding elements are the amplify and forward (AAF) type. Thus the proposed scheme is a DQOSTBC matrix with embedded adaptive DAF/AAF elements.
The bit error rate (BER) simulation results show that the proposed DQOSTBC is approximately 7dB better than the traditional DQOSTBC (all matrix elements are fixed to DAF type) at 10-3 BER because traditional DQOSTBC loses full diversity due to information received errors. The proposed DQOSTBC is about 2dB better than the rate 1/2 DOSTBC also proposed with adaptive DAF/AAF matrix elements at 10-3 BER at the same spectrum efficiency 2 bits/sec/Hz.


摘 要 i
ABSTRACT ii
誌 謝 iv
CONTENTS v
LIST OF FIGURES vi
Chapter 1 INTRODUCTION 1
Chapter 2 SYSTEM MODEL 3
2.1 Source to Relay 3
2.2 Relay to Destination 4
Chapter 3 PROPOSED FULL DIVERSITY DQOSTBC FOR FOUR SINGLE-ANTENNA RELAYS 5
3.1 Encoding of DQOSTBC at the Relay 5
3.2 Decoding of DQOSTBC at the Destination 9
Chapter 4 PERFORMANCE ANALYSIS 11
4.1 Diversity Product of DQOSTBC 11
4.2 Diversity Product of DOSTBC 13
Chapter 5 SIMULATION RESULTS 16
Chapter 6 CONCLUSION 20
REFERENCES 21
GLOSSARY 23


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[2] Z. D. Lei, C. Yuen, and Francois P.S. Chin, “Quasi-orthogonal space-time block codes for two transmit antennas and three time slots,” IEEE Transactions on Wireless Communications, vol. 10, no. 6, 2012, pp. 1983-1991.
[3] A. Nezampour, A. Nasri, and R. Schober, “Asymptotic analysis of space-time codes in generalized keyhole fading channels,” IEEE Transactions on Wireless Communications, vol. 10, no. 6, 2012, pp. 1863-1873.
[4] S. M. Tseng, “Sequential detection for multiuser MIMO CDMA systems with single spreading code per user,” IEEE Transactions on Wireless Communications, vol. 8, no. 7, 2009, pp. 3492-3497.
[5] S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE Journal Select. Areas Communications, vol.16, no.8, 1998, pp.1451–1458.
[6] H. Jafarkhani, “A quasi-orthogonal space-time block code,” IEEE Transactions Communications, vol. 49, no. 1, 2001, pp. 1-4.
[7] J. N. Laneman and G. W. Wornell, “Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks,” IEEE Transactions Information Theory, vol. 49, no. 10, 2003, pp. 2415-2425.
[8] S. Das, and M. Ghosh, “Implementation of full-diversity distributed STBC in cluster-based cooperative communication,” in Proc. IEEE Vehicular Tech. Conf., Singapore, 2008, pp. 1216-1220.
[9] S. H. Wang, Distributed quasi-orthogonal space time block code for four transmit antennas with information exchange error, MS thesis, National Taipei University of Technology, Taipei, Taiwan, 2011. (Advisor: Shu-Ming Tseng)
[10] Y. Jing, and H. Jafarkhani, “Using orthogonal and quasi-orthogonal designs in wireless relay networks,” IEEE Transactions Information Theory, vol. 53, no.11, 2007, pp. 4106-4118.
[11] W. Su and X. G. Xia, “Signal constellations for quasi-orthogonal space-time block codes with full diversity,” IEEE Transactions Information Theory, vol. 50, no. 10, 2004, pp. 2331-2347.
[12] X. Liu and W. Su, “Optimum selection relaying protocols in cooperative wireless networks,” IEEE Global Telecommunications Conference, 2006, pp.1-5.
[13] Y. Zhao and H. Chen, “Design and performance analysis of quasi-orthogonal space-time block codes for four antennae,” IEICE Transactions Fundamentals, vol. E88-A, 2005, pp. 3244-3247.
[14] V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space-time block codes from orthogonal designs,” IEEE Transactions Information Theory, vol. 45, no. 5, 1999, pp. 1456–1467.


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