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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 蘇炫榮(Hsuan-Jung Su) | |
| dc.contributor.author | Wei-Han Wang | en |
| dc.contributor.author | 王維漢 | zh_TW |
| dc.date.accessioned | 2021-06-13T15:18:12Z | - |
| dc.date.available | 2010-08-05 | |
| dc.date.copyright | 2008-08-05 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-25 | |
| dc.identifier.citation | [1] IEEE Standard for Local and metropolitan area networks Part
16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems,' [2] C. Y. Wong, R. S. Cheng, K. B. Letaief, and R. D. Murch, Multiuser OFDM with adaptive subcarrier, bit and power allocation, IEEE J. Select. Areas Commun., vol. 17, pp. 1747-1758, Oct. 1999. [3] J. G. Andrews, A. Ghosh, R. Muhamed, Fundamentals of WiMAX Understanding Broadband Wireless Networking,' [4] Brian Classon, Philippe Sartori, Vijay Nangia, Xiangyang Zhuang, and Kevin Baum, Multi-dimensional Adaptation and Multi-user Scheduling Techniques for Wireless OFDM Systems,' IEEE In- ternational Conference on Communications, vol. 3, May 2003, pp. 2251- 2255. [5] Sung Kyung Kim, Chung Gu Kang, Throughput analysis of band AMC scheme in broadband wireless OFDMA system,' Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE vol. 3, pp. 1305-1310 [6] Jin M. Ku, Pil K. Kim, Se J. Lee, Simon Shin, and Chung G. Kang,M, On the performance of broadband Mobile Internet Access Sys- tem, Wireless Pervasive Computing,' 2006 43 [7] S. Kallel and D. Haccoun, Generalized type II hybrid ARQ scheme using punctured convolutional coding,' IEEE Trans. Commun., vol. 38, no. 11, pp. 1938-1946, Nov. 1990. [8] A. Das, F. Khan, A. Sampath, and H.-J. Su, Adaptive, asyn- chronous incremental redundancy (A2IR) with ‾xed transmis- sion time intervals (TTI) for HSDPA, in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sept. 2002, pp. 1083-1087. [9] C. Tang, An intelligent learning scheme for adaptive modula- tion, in Proc. IEEE Vehicular Technology Conference (VTC 2001 Fall), Atlantic City, New Jersey, Oct. 2001, pp. 141V148. [10] J. Lee, R. Arnott, K. Hamabe, and N. Takano, Adaptive modulation switching level control in high speed downlink packet access transmission, in Proc. Third International Conference on 3G Mobile Communication Technologies, May 2002, pp. 156V159. [11] M. Nakamura, Y. Awad, and S. Vadgama, Adaptive control of link adaptation for high speed downlink packet access (HSDPA) in WCDMA, in Proc. The 5th International Symposium on Wireless Personal Multimedia Communications, Oct. 2002, pp. 382V386. [12] H.-J. Su, On adaptive threshold adjustment with error rate constraints for adaptive modulation and coding systems with hybrid ARQ, International Conference on Information, Communica- tions and Signal Processing, 2005, submitted. [13] H.-J. Su and T. Lin, Adaptive throughput maximization for adaptive modulation and coding systems, in Proc. Asia-Paci‾c Conference on Communications, Oct. 2005, pp. 406-410. 44 [14] H.-J. Su and L.-W. Fang, A Simple Adaptive Throughput Maxi- mization Algorithm for Adaptive Modulation and Coding Sys- tems with Hybrid ARQ,' International Symposium on Communica- tions, Control and Signal Processing, 2006 [15] Stephen B. Wicker, Error Control Systems for Digital Commu- nication and Storage,' Prentice Hall, c1995 [16] S. Lin, D. Costello, and M. Miller, Automatic-repeat-request error-control schemes Communications Magazine,' IEEE vol. 22, Issue 12, Dec 1984 pp. 5-17 [17] Simon Haykin, Communication Cystem,' 4th Edition, John Wiley and Sons, 2001. [18] High Speed Downlink Packet Access: Physical Layer Aspects, 3GPP TSG RAN WG1 Std. TR 25.858 V5.0.0, 2002-2003. [19] P. Robertson, P. Hoeher, and E. Villebrun, Optimal and sub- optimal maximum a posteriori algorithms suitable for turbo decoding,' European Transactions on Telecommunications, vol. 8, no. 2, pp. 119V125, March-April 1997. [20] C. Y. Wong, R. S. Cheng, K. B. Lataief, and R. D. March, Multiuser OFDM with adaptive subcarrier, bit and power allocation,' IEEE JSAC., vol. 17, no. 10, pp. 1747-1757, Oct. 1999. [21] H. Yin, H. Liu, An e±cient multiuser loading algorithm for OFDMbased broadband wireless systems,' Globecomm '00, San Francisco, USA, 2000. [22] D. Kivanc, and H. Liu, Computationally e±cient bandwidth allo- cation and power control for OFDMA,' IEEE Trans. on Wireless Comm., vol. 2, no. 6, Nov. 2003. 45 [23] M. Ergen, S. Coleri and P. Varaiya, QoS aware adaptive resource allocation techniques for fair scheduling in OFDMA based broadband wireless access systems,' IEEE Transactions on Broad- casting, vol. 49, no. 4, Dec. 2003. [24] J. Jang, K.B. Lee, and Y.H. Lee, Transmit Power and Bit Allo- cations for OFDM Systems in a Fading Channel,' Proc. IEEE GLOBECOM 2003, Dec. 2003. [25] S. P°etschinger, G. Munz, J. Speidel, An e±cient water-‾lling al- gorithm for multiple access OFDM,' IEEE Globecom '02, Taipei, Taiwan, November 2002. [26] W. Rhee and J.M. Cio±, Increase in capacity of multiuser OFDM system using dynamic subchannel allocation, Proc. of Vehicular Tech. Conf. (VTC), 2000, vol. 2, pp.1085-1089, May 2000. [27] C. Yih and E. Geraniotis, Adaptive modulation, power allocation and control for OFDM wireless networks', Proc. IEEE Int. Symp. on Personal, Indoor, Mob. Radio Commun., vol.2, pp.819-813, 2000. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37036 | - |
| dc.description.abstract | 正交分頻多工存取技術已經成為無線寬頻存取系統和 Evolved UTRA (UMTS
Terrestrial Radio Access) 下行鏈路的正式規格。其主因在於其本身較易對抗無線環境中的多重路徑干擾 (multipath interference) 以及同時可以彈性分配時間和頻率兩個維度的資源來取得多用戶分集增益 (multiuser diversity gain)。 在單一載波系統下的動態調變編碼技術已經逐漸成熟。其特性在於根據即時 的頻道狀況而挑選適當的調變編碼機制 (MCS) 來傳送資料並期許達到最大輸出 率 (throughput)。將動態調變編碼技術應用在正交分頻多工存取系統下，因其俱備同時追蹤頻道在時間和頻率上的變化之能力，故在資源分配上會有更高的彈性。 而由頻道的時變特性所造成的延遲或不正確的頻道狀況回饋而引發的效能下降， 將能夠以結合混合式自動重傳要求機制的方式來得到整體的系統改善。 現今在正交分頻多工存取系統的動態調變編碼技術的研究中，幾乎沒有研究 是針對動態調整調變編碼機制 (MCS) 的切換點來追蹤時變的頻道統計特性。因 此，在本篇論文當中，我們將提出一個在正交分頻多工存取下行鏈路系統下之頻 帶動態調變編碼及混合式自動重傳要求機制的系統架構，該架構的動態調變編碼 技術是採用動態調整切換點。透過模擬的結果顯示，我們所提出的動態調整切換 點的方法優於滿足某給定的封包錯誤率 (frame error rate) 之固定切換點的傳統方 法。 | zh_TW |
| dc.description.abstract | Orthogonal Frequency Division Multiple Access (OFDMA) technique was
adopted for the broadband wireless access (BWA) system because of its in- herent immunity to multipath interference and flexible resource allocation in both the time and frequency domains to obtain the multiuser diversity gain. Adaptive modulation and coding (AMC) technique in single-carrier sys- tem has been studied to do the adaptive transmission with the modulation and coding scheme (MCS) adjusted according to the instantaneous chan- nel condition for throughout maximization. Exploiting AMC technique in OFDMA system can be more flexible due to the ability to track the channel variation in both the time and frequency domain. In time-varying channels, the performance degradation of adaptive transmission caused by delayed or inaccurate channel condition feedback can be mitigated with the use of hy- brid automatic repeat request (HARQ). So far, few studies focus on dynamical adjustment of the MCS switching thresholds tracking the time-varying wireless channel in OFDMA system. In this thesis, we will propose a framework of downlink OFDMA system employing band-AMC scheme with HARQ. And the numerical result shows that our work outperforms the traditional method which is adopting fixed- threshold scheme with a target frame error rate (FER). | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T15:18:12Z (GMT). No. of bitstreams: 1 ntu-97-R95942049-1.pdf: 1151390 bytes, checksum: 7e7e7418f17d245da0b7794834ce817a (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Thesis Organization . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Adaptive Adjustment of MCS Thresholds for AMC Systems with HARQ 6 2.1 AMC Concepts for Throughput Maximization . . . . . . . . . 6 2.2 Related Work . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.1 System Model . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.2 Adaptive Threshold Adjustment Algorithm . . . . . . . 9 2.2.2.1 Throughput Analysis: . . . . . . . . . . . . . 9 2.2.2.2 Operations: . . . . . . . . . . . . . . . . . . . 10 3 Proposed Algorithm for Variable MCS in the Retransmis- sions 12 3.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.3 Problem Analysis . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.4 Proposed Algorithm . . . . . . . . . . . . . . . . . . . . . . . 17 3.4.1 When in initial transmission: j = 1 . . . . . . . . . . . 17 3.4.2 When in retransmissions: j > 1 . . . . . . . . . . . . . 18 3.4.3 Operations: . . . . . . . . . . . . . . . . . . . . . . . . 23 3.5 Numerical Results . . . . . . . . . . . . . . . . . . . . . . . . . 24 4 Proposed Framework of OFDMA Downlink System 29 4.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.2 Subchannel Allocation Scheme . . . . . . . . . . . . . . . . . . 32 4.3 Rate Matching Method . . . . . . . . . . . . . . . . . . . . . . 32 4.3.1 Proposed Method . . . . . . . . . . . . . . . . . . . . . 33 4.4 Adaptive Threshold Adjustment Algorithm in the Proposed Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.5 Numerical Results . . . . . . . . . . . . . . . . . . . . . . . . . 36 5 Conclusion and Future Work 41 5.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 References 43 | |
| dc.language.iso | en | |
| dc.subject | 封包錯誤率 | zh_TW |
| dc.subject | 正交分頻多工存取 | zh_TW |
| dc.subject | 多用戶分集增益 | zh_TW |
| dc.subject | 頻帶動態調變編碼 | zh_TW |
| dc.subject | 混合式自動重傳要求機制 | zh_TW |
| dc.subject | band-AMC | en |
| dc.subject | multiuser diversity | en |
| dc.subject | OFDMA | en |
| dc.subject | FER | en |
| dc.subject | HARQ | en |
| dc.title | 正交分頻多工存取下行鏈路系統之頻帶動態調變編碼及混合式自動重傳要求機制 | zh_TW |
| dc.title | Band-AMC Scheme with Hybrid ARQ in Downlink OFDMA Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林茂昭(Mao-Chao Lin),易志孝(Chi-Hsiao Yih) | |
| dc.subject.keyword | 正交分頻多工存取,多用戶分集增益,頻帶動態調變編碼,混合式自動重傳要求機制,封包錯誤率, | zh_TW |
| dc.subject.keyword | OFDMA,multiuser diversity,band-AMC,HARQ,FER, | en |
| dc.relation.page | 46 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-25 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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|---|---|---|---|
| ntu-97-1.pdf 未授權公開取用 | 1.12 MB | Adobe PDF |
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