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研究生:江亞宸
研究生(外文):Ya-Chen Chiang
論文名稱:最大比值與最佳多輸入多輸出系統於宏細胞/微細胞環境下之表現分析
論文名稱(外文):Performance Analysis of MRT and OT MIMO Systems in Macro/Micro Cell Environments
指導教授:林昇洲
指導教授(外文):Sheng-Chou Lin
口試委員:李世凱劉鴻裕
口試委員(外文):Shih-Kai LeeHong-Yu Liu
口試日期:2012-06-28
學位類別:碩士
校院名稱:輔仁大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:76
中文關鍵詞:最大比值傳輸最佳傳輸同頻干擾符號間干擾正交幅度調變多傳送多接收微細胞環境宏細胞環境高斯正交規則
外文關鍵詞:Maximal Ratio Transmission, MRTOptimum Transmission, OTCochannel Interference, CCIIntersymbol Interference, ISIQuadrature Amplitude Modulation, QAMMultiple-Input/Multiple-Output, MIMOMicro cellMacro cellGaussian Quadrature Rule, GQR
相關次數:
  • 被引用被引用:1
  • 點閱點閱:153
  • 評分評分:
  • 下載下載:7
  • 收藏至我的研究室書目清單書目收藏:0
本文主要分析最大比值傳輸 (Maximim ratio transmission, MRT)與最佳合併傳輸 (Optimal combining transmission, OT)於多傳送多接收(Multi input/Multi output, MIMO)系統下,同頻干擾訊號於宏細胞(Macro cell)與維細胞(Micro cell)環境下的表現比較與討論。系統主訊號則使用正交幅度調變(QAM)的技術於平坦衰減通道下傳輸,於模擬中單一及多個干擾源的情況皆被考慮且與主訊號使用相同的調變方式。在固定同頻干擾訊號的模擬中,我們將接收端的主訊號與同頻干擾訊號之間所存在的隨機時間延遲與否皆列入模擬條件,探討因時間延遲所產生的符號間干擾(Intersymbol interference, ISI)對系統所造成的影響,此部分的探討在多數的文獻中是常常被省略的。在系統錯誤率的運算時,我們使用了高斯正交規則(Gaussian quadrature rule,GQR) 的錯誤率估測,其特性在於能近似出同頻干擾以及相鄰符號間干擾的機率密度函數(probability density function,pdf),以此達到使系統運算速度提升且同樣準確的錯誤率模擬的表現結果。高斯同頻干擾的情況也將同時呈現以便於與固定同頻干擾使用最大比值多傳送多接收的系統進行比較,由其中的模擬結果來更清楚的分析與了解同頻干擾訊號對於多傳送多接收的蜂巢式傳輸系統的影響,以達到更有效率的頻率重覆使用目的。
This thesis presents the performance analysis of optimum transmission (OT) and maximum-ratio transmission (MRT) for multiple-input/multiple-output (MIMO) systems subject to cochannel interference (CCI) in micro/macro cellular mobile radio environments. We consider quadrature amplitude modulation (QAM) transmission operating over a flat fading channel. Our analysis accounts for pulse waveform and modulation of the desired signal as well as CCI. The precise CCI model, which takes into account the random symbol timing offset between the desired signal and CCI, is used in our analysis. The effect of this offset might result in intersymbol interference (ISI) even in a flat fading environment and was usually neglected by previous studies. In order to obtain the accurate results efficiently, the average error rate for each Mote-Caro simulation run is calculated by using Gaussian Quadrature Rule (GQR), which can approximate the probability density function (pdf) of CCI and ISI. A Gaussian interference model is also provided for a comparison with the precise interference model in the MRT based MIMO system. The results of this study are expected to lead to a better understanding of the effects of interference, and then to optimize spectrum reuse and coverage in a MIMO system.
ㄧ 緒論 1
1.1 無線傳輸的通道環境 3
1.2 同頻干擾訊號 4
1.3 分集接收 4
1.4 單傳送多接收 5
1.5 多傳送單接收 5
1.6 多傳送多接收 6
1.7 研究目的 6
1.8 本文架構 9
二 系統架構 10
2.1 訊號調變 10
2.2 無線傳輸的通道環境 12
2.3 接收端的訊號以及分集合併 14
2.4 訊雜比與訊號干擾比的定義 17
三 權重推導 18
3.1 最大比值傳輸 18
3.2 最佳傳輸 19
四 錯誤率估測 22
4.1 高斯分佈的同頻干擾訊號錯誤率 22
4.2 非高斯分佈的同頻干擾訊號錯誤率 24
4.3 高斯正交規則 26
五 模擬結果 30
5.1 最大比值合併傳輸系統效能分析 30
5.1.1 無衰減通道下同頻干擾訊號的隨機時間延遲與無時間延遲 31
5.1.2 無衰減通道下的主訊號與同頻干擾訊號 32
5.1.3 瑞雷衰減通道的主訊號與無衰減的同頻干擾訊號 35
5.1.4 無衰減的主訊號與瑞雷衰減的同頻干擾訊號 37
5.1.5 宏細胞傳輸環境下同頻干擾訊號的隨機時間延遲與
無時間延遲(室外傳輸) 39
5.1.6 宏細胞傳輸環境下同頻干擾訊號有隨機時間延遲
的系統模擬 (室外傳輸 41
5.1.7 微細胞傳輸環境下同頻干擾訊號有隨機時間延遲的
系統模擬 (室內傳輸) 43
5.2 最大比值傳輸與最佳合併傳輸的系統效能分析 46
5.2.1 無衰減通道下同頻干擾訊號的隨機時間延遲與
無時間延遲 46
5.2.2 無衰減通道下的主訊號與同頻干擾訊號 48
5.2.3 瑞雷衰減通道的主訊號與無衰減的同頻干擾訊號 52
5.2.4 無衰減的主訊號與瑞雷衰減的同頻干擾訊號 56
5.2.5 宏細胞傳輸環境下同頻干擾訊號的隨機時間延遲與
無時間延遲 60
5.2.6 宏細胞傳輸環境下同頻干擾訊耗有隨機時間延遲的
系統模擬(室外傳輸) 62
5.2.7 微細胞傳輸環境下同頻干擾訊號有隨機時間延遲的
系統模擬(室內傳輸K=7) 66
5.2.8. 微細胞傳輸環境下同頻干擾訊號有隨機時間延遲的
系統模擬(室內傳輸K=12) 70
六 結論 73
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