臺灣博碩士論文加值系統

互動式多媒體的快速發展，導致新的無線網路服務不斷推陳出新，對於傳輸速度的要求也逐漸升高，帶動了multi-Gbps無線傳輸技術的發展。然而，60 GHz的免授權頻段其頻寬限制在7 GHz，並且60 GHz的微波訊號在空氣中有著非常大的衰減，較適合短距離的無線傳輸。因此，60 GHz的光載微波無線訊號系統搭配上空間多功的MIMO技術是一個非常可實現的一個方法，提供一個寬頻、覆蓋範圍廣以及機動性兼具的服務。
在此篇論文中，藉由頻域等化器實現2 x 2 MIMO技術，提高頻譜使用效率達成傳輸資料倍增的效果。我們在實驗上成功傳輸60GHz 頻段上7 GHz免授權頻寬的16-QAM MIMO 單載波訊號，傳輸速度達到2 x 13.575 Gb/s，在經過25公里的單模光纖和3公尺的無線傳輸以後，訊號品質幾乎沒有改變。

The rapid growth of data rates of new wireless applications led by interactive multimedia services is driving the need for multi-Gbps wireless communication technologies in the near future. However, the bandwidth of the license free spectrum at 60 GHz is limit to 7 GHz and 60-GHz millimeter-waves have very high propagation losses rendering them more suitable for short-range wireless links (~10m). Therefore, 60-GHz radio-over-fiber (RoF) system with spatial-multiplexing MIMO technology is a promising candidate to provide broadband service, wide coverage, and mobility.
In this these, 2 x 2 MIMO technique is realized by frequency domain equalizer (FDE) to improve spectrum efficiency doubling the data throughput. We experimentally demonstrate 2 x 13.575 Gb/s 16-QAM MIMO single carrier signal transmission within 7-GHz license-free bandwidth at 60-GHz band. The power penalty is negligible after transmission over 25-km single mode fiber and 3m wireless distance.

CONTENTS
Acknowledgements ii
Chinese Abstract iii
English Abstract iv
Contents v
List of Figure vii
Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivation 2
1.3 Objection and Problem Statement 4
Chapter 2 Multiple-Input Multiple-output Technology 5
2.1 Perface 5
2.2 MIMO Technology for Improving Performance 6
2.2.1 Diversity 6
2.2.2 Alamouti Space-Time Code 7
2.3 MIMO Technology for Improving Capacity 10
2.3.1 Spatial Multiplexing : Zero-Forcing Receiver 12
2.3.2 Spatial Multiplexing : Maximum-Likelihood Receiver 16
Chapter 3 Single Carrier Frequency Domain Equalizer 18
3.1 Preface 18
3.2 Inter-Symbol Interference 18
3.3 Linear Convolution and Circular Convolution 19
3.4 Single Carrier Frequency Domain Equalizer 20
3.5 MIMO Technology with Frequency Domain Equalizer 22
Chapter 4 The Theoretical Calculation of Proposed System 25
4.1 Introduction Mach-Zehnder Modulator 25
4.2 Theoretical calculation of single drive MZM 28
4.2.1 Bias at Maximum Transmission Point 28
4.2.2 Bias at Quadrature Point 30
4.2.3 Bias at Null Point 30
4.3 The Concept of The Proposed System 31
4.4 Theoretical Calculation of The Proposed System 32
Chapter 5 Experimental Demonstration of The Proposed System 35
5.1 Preface 35
5.2 Experiment Setup 35
5.3 Experimental Result for SC Signal with SISO Channel 38
5.3.1 Transmission Result of SC QPSK Signal (SISO) 38
5.3.2 Transmission Result of SC 8-QAM Signal (SISO) 40
5.3.3 Transmission Result of SC 16-QAM Signal (SISO) 41
5.4 Experimental Result for SC Signal with MIMO Technology 41
5.4.1 SC MIMO Signal at Different FFT Size of FDE 42
5.4.2 SC MIMO Signal at Different CP Length of FDE 44
5.4.3 SC MIMO Signal at Different Channel Correlation 45
5.4.4 Transmission Result of SC QPSK Signal (MIMO) 46
5.4.5 Transmission Result of SC 8-QAM Signal (MIMO) 47
5.4.6 Transmission Result of SC 16-QAM Signal (SISO) 49
Chapter 6 Conclusion 51
References 52

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