臺灣博碩士論文加值系統

參考之前文獻Dawei Wang提出的論文，在OFDMA上行影像傳輸系統中作跨層資源分配的架構當基礎，這篇論文為考慮一個MIMO的正交分頻多工系統，使用者傳送影像資訊，同時受到其他用戶的干擾，並且試著重新分配功率與頻譜的資源給使用者，為了降低干擾、提高PSNR，提出結合SVD的MIMO資源分配方式；干擾消除部份，我們利用SVD演算法來估測傳輸通道及預編碼矩陣，進而還原所傳送的訊號。模擬結果顯示，結合SVD的MIMO資源分配方式，在低SNR時，多個使用者的情況下，PSNR會比單純ZF好約2-4dB。經本論文所結合的干擾消除機制與資源分配後，可對抗多使用者間的干擾及提升傳輸影像品質。

Based on the Dawei Wangs paper, in the OFDMA uplink image transmission system for cross-layer resource allocation architecture when the basis of this paper to consider the users to send video information in a MIMO orthogonal frequency division system, while which is subject to the interference of other users and try to re-allocate power and spectrum of resources to the user. In order to reduce interference and improve PSNR, we put forward the combination of SVD (singular value decomposition) and ZF(zero-forcing) algorithm of MIMO resource allocation; in the part of interference elimination, we use ZF-SVD algorithm to estimate the transmission channel and precoding matrix and thereby return to the original signal. The simulation results show that, in the case of low SNR, the PSNR is about 2-4dB better than the ZF case in the case of multiple users. The interference elimination mechanism and resource allocation combined with this paper can be used to deal with the interference between multi-users and enhance the transmission image quality.

目錄
摘 要 i
ABSTRACT ii
誌謝 iv
第一章 緒論 1
第二章 系統模型 2
2.1 OFDMA上行影像傳輸系統 2
2.2 干擾消除機制 3
2.3 影像失真率模型 5
第三章 資源分配演算法 7
3.1 初始化設定 7
3.2 注水式功率分配與斜率計算 7
3.3 子載波重新分配 8
第四章 模擬結果 10
第五章 結論 13
參考文獻 14

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