臺灣博碩士論文加值系統

由於多媒體服務的需求迅速增加，第三代合作夥伴計劃(3GPP)提出了多媒體廣播/群播服務的技術來因應此需求。而多媒體廣播/群播服務也支援多重解析度服務的多媒體資料串流，並且能夠有效地增加系統吞吐量，不同的解析度被視為不同的服務層級。傳送端在彼此間獨立且不同的通道上傳送不同解析度的資料串流，因此會導致資源的使用較沒效率。而在接收端有部分，在高解析度服務通道上傳送的資料裡包含了用來提升低解析度的服務層級的接收訊號品質的可利用資料。於是，我們提出了多階層結合調變和混合式自動重送請求技術來改善資源使用的效率以及增加系統的吞吐量和服務範圍。多階層結合調變法能夠完整地利用所有在不同通道中傳送的重要資訊，而混合式自動重送請求技術在系統的第一次傳送結束後進行第二次傳送，因此可增加多樣性使接收效能能夠有效地改善。在此篇研究中，我們將會討論四種不同的傳送方案，而每一種方案代表傳送端都將會重新傳送一個特定服務層級的訊號。在我們的研究中，主要探討的主題是選擇哪一個服務層級的訊號來重傳能夠得到對整體系統有較好的性能，在我們的模擬結果中可以觀察出混合式自動重送請求技術能夠有效地改善系統的接收品質，並且能夠得到一個對整體系統性能有最大益處的重傳機制。

Chapter 1 Introduction
Chapter 2 Background Knowledge
2.1 Multilevel Coupling Modulation for Multimedia Broadcast/Multicast Service(MCM-MBMS)
2.2 Multilevel Coupling Modulation for Multi-resolution MBMS
2.3 Constellation Mapping of MCM Scheme
Chapter 3 HARQ for Multilevel Coupling Modulation in Multi-resolution MBMS
3.1 System Model of HARQ in MCM-MBMS
3.2 HARQ scheme for MCM in Multi-resolution MBMS
Chapter 4 Simulation Results
4.1 Simulation Parameter
4.2 Simulation Results
Chapter 5 Conclusion

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