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完整後設資料紀錄
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
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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.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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