電機資訊學院: 電信工程學研究所指導教授: 蘇炫榮曾建勛Tseng, Chien-HsunChien-HsunTseng2017-03-062018-07-052017-03-062018-07-052016http://ntur.lib.ntu.edu.tw//handle/246246/276136此篇論文研究在多細胞群播廣播系統 (E-MBMS)中，對於多群利用相同無線時間及頻率資源的群播服務群組提供無線快取結合式的集波束設計。藉由多個合作細胞的結合式集波束設計，可以提升在多個群播服務群組中收到最差訊號干擾雜訊比(SINR)的用戶的效能。我們依據文獻中提出的半正定規劃(Semidefinite Relaxation)技術的演算法結合無線快取(Wireless Caching)的技術，進而節省尖峰時段回程網路(Backhaul)的頻寬。無線快取資料部分使用最佳無碼率的極大距離可分碼(Rateless MDS code)進行編碼，因為考慮快取控制的設計，我們將無線傳輸分成兩個模式，使得快取資料能夠充分利用。此篇論文所提出之演算法可以改善細胞邊緣(Cell-edge)用戶之訊號干擾訊比，並且降低骨幹網路訊務量。模擬結果顯示論文所提出跨層演算法比現行群播廣播單頻網(MBSFN)效能更佳。In this thesis, we consider a cache-aid joint beamforming design problem in the multicell multicast system with multiple groups that provide different multicast service. Inspired by previous work in the literature, we apply semidefinite relaxation (SDR) to perform joint beamforming design among the cooperating base stations. Hence, the joint beamforming design can enhance the performance of user who receives the worst signal-to-interference-plus-noise ratio (SINR). We apply the wireless caching technology to reduce the bandwidth of backhaul link, and use the rateless MDS code to encode media files. We design the cache control and divide the joint beamforming into two transmission mode. In order to improve the performance of cell-edge users and reduce the backhaul traffic in busy hour, we propose a cache-aid joint beamforming algorithm. By our simulation results, we show that the proposed algorithm provides better performance compared to the existing multicast methods in the multicell environment.1152583 bytesapplication/pdf論文公開時間: 2016/2/16論文使用權限: 同意有償授權(權利金給回饋學校)群播無線快取猛禽碼結合式集波束最佳化設計半正定規劃MulticastWireless cachingRaptor codeJoint beamformingConvex optimizationSemidefinite relaxationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/276136/1/ntu-105-R02942040-1.pdf