博碩士論文 100523003 詳細資訊




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姓名 何承翰(Cheng-han Ho)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 正交分頻多工存取在不完美通道狀態資訊下之資源分配
(Resource Allocation with Imperfect CSI in OFDMA Environments)
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摘要(中) 以往在正交分頻多工存取(orthogonal frequency division multiple access, OFDMA)環境下的資源分配(resource allocation)研究,大多假設可以獲得完美的通道狀態資訊(channel state information, CSI),然而由於存在通道估測誤差以及時間回覆延遲等原因,使得以上假設不符合實際情況,因此在不完美通道狀態資訊(imperfect CSI)下的資源分配演算法設計,在近年來獲得了較多的關注。本篇論文首先討論正交分頻多工存取環境,在完美通道狀態資訊下的Chunk 分配,接著將此技術應用於所提出之正交分頻多工存取環境,在不完美通道狀態資訊下的資源分配方式中,以簡化系統的運算次數。
本文提出一種新的資源分配演算法,稱作無妒忌資源分配(envy-free resource allocation),此方法能夠降低使用者在正交分頻多工存取環境,因為資源分配不均而產生的妒忌行為。提出的演算法以最小化使用者彼此間分配到的平均資料率總和差異為目標,並確保每個分配的子載波能夠滿足位元錯誤率的限制條件。
模擬結果顯示出,提出的演算法隨著可用來分配的Chunk 個數增加時,使用者彼此
之間分配到的平均資料率總和差異數值也會逐漸變小,代表著使用者產生妒忌行為的可能性也越小。另外當可用來分配的Chunk 個數夠多時,兩個使用者在不同的可加性錯誤情形下的效能表現,也能夠接近兩個使用者在相同的可加性錯誤情形下的效能表現。
摘要(英) The design of resource allocation in OFDMA environments have been assumed that perfect channel state information (CSI) can be estimated in previous researches. However, it is rarely possible to get perfect CSI due to channel estimation error and feedback delay. Hence,the algorithm to solve imperfect CSI draws much more attention. In order to reduce computation amount for system, we have discussed the chunk allocation technique in OFDMA environments with perfect CSI and combine this technique into our proposed scheme in OFDMA environments with imperfect CSI.
In this thesis, we proposed a novel resource allocation algorithm called “envy-free resource allocation” which could reduce the envy behavior among users due to unequal allocated resources in OFDMA environments. The proposed scheme minimizes the total average rate difference between each pair of users, subject to average BER constraints for each allocated subcarrier.
Simulation results show that, a larger allocated number of chunks could guarantee a smaller total average rate difference between users, resulting in a much smaller chance for users to envy each other. Furthermore, when the allocated chunk number is big enough, then the performance of users with unequal additive error is close to users with equal additive error.
關鍵字(中) ★ 正交分頻多工存取
★ 資源分配
★ 無妒忌
關鍵字(英) ★ OFDMA
★ resource allocation
★ envy-free
論文目次 中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 緒論 1
1.1 正交分頻多工存取與長程演進 1
1.2 研究背景與目的 5
1.3 Chunk 基礎的資源分配 6
第二章 通道分析與傳統資源分配技術 9
2.1 完美通道狀態資訊定義 9
2.2 不完美通道狀態資訊定義 12
2.3 位元錯誤率為基礎的Chunk分配演算法 16
2.3.1 位元錯誤率為基礎的單載波基礎分配 17
2.3.2 位元錯誤率為基礎的Chunk分配 19
2.4 模擬結果與討論 21
2.4.1 完美通道狀態資訊模擬環境 22
2.4.2 不完美通道狀態資訊模擬環境 24
第三章 無妒忌資源分配演算法 26
3.1 以使用者為中心之資源分配概念與數學分析 26
3.2 無妒忌單載波分配 28
3.3 無妒忌Chunk分配 30
3.4 模擬結果與討論 34
3.4.1 通道估測誤差之不完美通道狀態資訊模擬環境 35
3.4.2 可加性錯誤之不完美通道狀態資訊模擬環境 40
第四章 結論 49
參考文獻 51
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指導教授 林嘉慶(Jia-chin Lin) 審核日期 2013-7-3
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