高速率多天線系統的設計與實作是在探討基於802.11n MIMO架構下為達到1Gbps PHY Rate (physical layer transmission rate)，所需要之多天線系統規格與MIMO硬體規格。
論文中使用了四套802.11n 產品（包含了AP與Client Card），設計了一個有8支天線的多天線測試平台，藉由改變天線間的隔離度，使測試系統可以達到1200Mbps之實體層傳輸率。

IEEE 802.11n wireless network system have good performance that can reach 300Mbps physical layer transmission rate by two transmit stream & two receive stream. In 802.11n MIMO system, antenna’s isolation is important specification. Target of thesis is to get minimum isolation of multi-antennas for reduce antenna‘s space. Multi-Antennas sysytem must work on 1200Mbps physical layer transmission rate that’s key of requirement.
In testing system, four 802.11n products (include AP & Client card) combination be used. Tuning isolation of multi-antennas perform 1200Mbps physical layer transmission rate, that can prove the result of minimum isolation of multi-antennas is workable.

目錄
第一章	緒論 ...............................................................1
1.1  研究動機與目的.................................................................1
1.2  研究方法.............................................................................2
1.3  各章節摘要.........................................................................2
第二章	系統概述.........................................................................3
2.1  無線通訊系統介紹..............................................................3
2.2  多重輸入多重輸出(MIMO)系統簡介................................4
第三章	高速率多天線系統之設計......................................6
3.1  系統架構介紹.......................................................................6
3.2  系統規格設計探討..............................................................11
3.3  802.11n 設備測量方法.......................................................15
3.4  天線測量方法......................................................................20
3.5  測試設備及天線在系統上須達到之要求..........................24
第四章	高速率多天線系統之驗證測試..........................25
4.1  802.11n設備測量結果........................................................25
4.2  Client Card 的天線特性.....................................................33
4.3  AP 天線測試結果...............................................................39
4.4  驗證多天線系統之傳輸速率測試....................................43
4.5  最佳化設計考量及設計參數探討....................................45
第五章	結論與未來展望........................................................46
5.1  多天線系統之設計重點....................................................46
5.2  未來展望............................................................................48
參考目錄...........................................................................................50
























圖目錄
圖 2.1-1 通訊系統基本結構..................................................................3
圖 2.1-2 Atheros 802.11n 3x3 無線網路系統........................................4
圖 2.2 MIMO 架構及空間函數公式.....................................................5
圖 3.1 系統架構圖.................................................................................7
圖 3.1.1.1 802.11n dual-band AP board...................................................8
圖 3.1.1.2 802.11n Client Card................................................................8
圖 3.1.1.3 Giga Ethernet Switch Board....................................................9
圖 3.1.1.4  IP traffic Testing Tool...........................................................9
圖 3.2.1  IEEE 802.11n, HT=40MHz 之頻譜......................................11
圖 3.2.2  實際測量 Atheros 802.11n 40MHz 之頻譜........................12
圖 3.2.4  802.11n 參數表.....................................................................13
圖 3.3.1  Transmit Power Level測量方法...........................................15
圖 3.3.2-1 Error Vector Magnitude 測量方法.......................................16
圖 3.3.2-2  EVM 定義.........................................................................17
圖 3.3.3-1  Transmit Spectrum Mask 測量方法.................................18
圖 3.3.3-2  802.11n 40MHz Spectrum Mask 要求規格.....................18
圖 3.3.4  Receiver Sensitivity 測量方法............................................19
圖 3.4.1  天線 Return loss 和 Isolation測量方法.............................21
圖 3.4.2 Anechoic Chamber NSI control system....................................22
圖 4.3.3-1  CST Antenna simulation tools............................................23
圖 4.3.3-2 CST Return Loss/Isolation/3D pattern 模擬結果................23
圖 4.1.3  AP的EVM 測試結果.........................................................27
圖 4.1.4  AP的EVM 測試結果.........................................................28
圖 4.1.5  AP的Spectrum Mask 測試結果.........................................29
圖 4.1.6  Client Card  Spectrum Mask 測試結果.............................30
圖 4.1.9  相鄰頻譜之干擾情形測量結果...........................................32
圖 4.2  Client Card 所使用之天線.....................................................33
圖 4.2.1 Client Card 的Return Loss and Isolation 結果.....................34
圖 4.2.2-1 Client Card Left Antenna Radiation Pattern.........................35
圖 4.2.2-2 Client Card Right Antenna Radiation Pattern……….…......36
圖 4.2.3-1  CST 模擬..........................................................................37
圖 4.2.3-2  CST 模擬 Client Card Left Antenna 結果.....................37
圖 4.2.3-3  CST 模擬 Client Card Right Antenna 結果...................38
圖 4.2.3-4  Client Card Left Antenna模擬與實測比較......................38
圖 4.2.3-4  Client Card Right Antenna模擬與實測比較....................38
圖 4.3.1-1  一套802.11n 可達之最高傳輸量.......................................39
圖 4.3.1-2  相距240mm之天線隔離度................................................40
圖 4.3.1-3  相距220mm之天線排列....................................................40
圖 4.3.2    AP 所使用之天線...............................................................41
圖 4.3.3    AP Antenna 的Return Loss 結果......................................41
圖 4.3.4    AP Antenna 之 Radiation Pattern.......................................42
圖 4.4.1-1  Client card x4 架設圖..........................................................43
圖 4.4.1-2  AP Antenna 架設圖.............................................................43
圖 4.4.2    Ap x2 傳輸量實測值..........................................................44
圖 4.4.3    系統傳輸量實測值..............................................................44














表目錄
表 3.1.2  AP WLAN 及 IP 設定表.....................................................10
表 3.2.3  AP 頻率設定表.....................................................................13
表 3.3.2  Error Vector Magnitude 要求...............................................17
表 3.3.4  802.11n Receive Sensitivity 要求規格................................19
表 4.1.1  AP的Transmit Power Level測試結果...............................25
表 4.1.2  Client card 的Transmit Power Level測試結果.................26
表 4.1.3  AP Transmit power level = 7.5dBm 之 EVM 結果…......27
表 4.1.4  Client Card的Tx = 7.5dBm 之 EVM 結果.....................28
表 4.1.17 AP Receiver Sensitivity 測量結果......................................31
表 4.1.18 Client card Receiver Sensitivity 測量結果.........................31

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