臺灣博碩士論文加值系統

在此篇論文中我們將使用了兩個多路徑通道模型，一個為室內的通道模型，另一個為室外的通道模型，並且將這兩個通道模型應用在MIMO通道模型中。我們利用了蒙地卡羅方法去估算MIMO-OFDM容量的累加分配函數。運用了一些統計方法在不同的通道模型下，我們觀察到MIMO系統和MIMO-OFDM系統的通道容量變化和MIMO-OFDM系統每個子通道的通道容量變化。在此我們也說明了MIMO系統可更有效的幫助OFDM系統抵抗頻率選擇性衰減。之後我們將以IEEE 802.11a系統結合MIMO系統為例，說明其通道容量的變化和在IEEE 802.11a系統在權衡系統複雜度和子通道的通道容量變化下，在二對二天線到四對四天線其選擇是比較好的。

In this thesis two multi-path channel models, the indoor IEEE 802.11 channel and the outdoor COST 207, are used to evaluate the channel capacity and performance of MIMO-OFDM systems. According to some statistic characteristics over various channel models, the variations of sub-channel capacity over MIMO-OFDM are observed and analyzed. Computer simulations and illustration demonstrate that the MIMO-OFDM systems can effectively combat frequency-selective fading and meanwhile maintain very high spectrum efficiency. MIMO-WLAN is selected as a study example to illustrate the balance between system complexity and performance over fading channel. It is recommend that a 3Í3 MIMO-OFDM structure might be a good choice for the WLAN systems.

目 錄
中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 x
第一章 前言 1
第二章 多輸入多輸出通道模型與通道容量計算 3
2-1單一路徑通道模型 3
2-2多路徑通道模型 7
2-3多輸出多輸入通道模型 13
2-4多輸出多輸入通道容量計算 20
第三章多輸入多輸出-正交分頻多工系統通道容量 27
3-1 OFDM系統介紹 27
3-2 MIMO-OFDM系統介紹 31
3-3 MIMO-OFDM系統通道容量 34
3-4 MIMO-OFDM系統和MIMO系統的比較 35
3-5 MIMO-OFDM系統分析 38
第四章 MIMO-OFDM for WLAN System 53
4-1 IEEE 802.11a 系統介紹 53
4-2 MIMO system for IEEE 802.11a 56
4-3 MIMO-WLAN之最佳天線數目 64
第五章 結論 73
參考文獻 75

參考文獻
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