由於網路的普及造成Ethernet 為目前當紅產業，也因而形成近年來無線網路的快速成長。普及的WLAN 規格IEEE 802.11a/g 於2003 年7 月正式公布，而新一代的WLAN 規格IEEE 802.11n 的發展也已進入成熟期；此外，無線寬頻連接的技術已拓展到戶外，如目前國內所大力推展的M-Taiwan 計畫，即採用IEEE 802.16e 稱之為Mobile WiMAX 的技術。在這些當代熱門的無線通訊系統裡，一個重要的關鍵就是使用Multiple Input and Multiple Output (MIMO) 系統的MIMO OFDM 技術。本計畫的目標為針對MIMO OFDM 系統在無線時變通道環境下強化MIMO 通道估計以及通道追蹤技術，以發展先進的通訊訊號處理演算法，並訓練相關關鍵技術的傳輸晶片設計人才，以及能將最新的技術提供國內廠商合作開發以爭取先機。我們將分兩個階段進行這個計畫，第一年偏重於提升傳輸穩定性的OFDM 通道追蹤演算法研究並依照所蒐集的資訊建立可能的傳輸模型，第二年完成應用於MIMO OFDM 系統相關問題之研究，並在時變通道下進一步作系統參數的研究。基於此計畫，我們將在MIMO OFDM 系統下提出新的盲目式通道追蹤系統模型。 ; Prevalence of networks has driven Ethernet become the hot industry, which is also the reason of rapid growth of wireless networks. The popular WLAN standard, IEEE 802.11a/g, has been released in July, 2003 and the following standard, IEEE 802.11n, is ready to be mature in the commercial market. Besides, the broadband wireless access technology is considered to practice in outdoor, such as the IEEE 802.16e called Mobile WiMAX which is denominated as the M-Taiwan project by the Taiwan’s authority. A key issue that is common in those modern wireless communication technologies is to apply the multiple-input and multiple-output (MIMO) system for the OFDM technology. The goal of this project is to study MIMO OFDM systems with enhancement of MIMO channel estimation and channel tracking in time-varying wireless channels, in order to develop advanced communication signal processing algorithms and educate key persons. This project is divided into two phases: the first year, we focus on the algorithm studies for stable transmission over the time-varying channel and build the system model relying on the knowledge from our surveys; and the second year, we continue to modify the system specification and complete the overall MIMO OFDM system application for different channel environments. Based on this project, we can propose a new blind channel tracking technique for MIMO OFDM systems in the time-varying channel. ; 研究期間 9708 ~ 9807
