臺灣博碩士論文加值系統

天線陣列已被廣泛用於5G蜂巢式網路中。 眾所周知，AoA和AoD的資訊對於波束成形的應用至關重要。本篇論文研究了混合平面天線陣列在OFDM系統中的聯合通道，AoA和AoD估計。 在我們的做法中，首先估計每一對發射天線和接收天線之間的通道脈衝響應，然後利用所估計的通道脈衝響應得出AoA和AoD。 為了恢復因混合陣列結構所損失的自由度，我們採用了多重傳輸方案。 模擬表示，該方法可以準確估計AoA和AoD。 最後，我們使用一軟體定義無線電平台以及一毫米波射頻前端模組所組成的系統來進行AoA估計的實驗。 考慮到實際應用，最終採用了功率掃描估計方法。 實驗結果表示，AoA估計效能很大程度上與實際的AoA有強烈相關。

Antenna array has been widely used in 5G cellular systems. It is known that AoA and AoD information is critical for the application of beamforming. In this thesis, we study joint channel, AoA, and AoD estimation for OFDM systems with hybrid planar antenna array. In our approach, the channel impulse response between each pair of transmit and receive antennas is first estimated, and then AoA and AoD are derived with the estimated responses. To recover the degree-of-freedoms lost with the hybrid array structure, a multiple transmission scheme is adopted. Simulations show that AoA and AoD can be accurately estimated with the approach. Finally, a system with a software-defined-radio platform and a mmWave front-end module is used to conduct experiments for AoA estimation. For the consideration of real-world applications, the scanning method is adopted. The results show that the estimation performance strongly depends on the actual AoA.

摘要 i
Abstract ii
Acknowledgement iii
Content iv
List of tables v
List of figures vi
Chapter 1. Introduction 1
1.1 Motivation 1
1.2 Literature review 2
1.3 Main work 2
1.4 Outlines 3
Chapter 2. Joint channel, AoA, and AoD Estimation for System with ULA 5
2.1 Joint channel, AoA, and AoD estimation for digital array 5
2.1.1 System model 6
2.1.2 CIR estimation 9
2.1.3 Joint AoA and AoD estimation 11
2.2 Joint channel, AoA, and AoD estimation for hybrid array 14
2.2.1 System model 14
2.2.2 CIR (Channel impulse response) estimation 17
2.2.3 Joint AoA and AoD estimation 19
Chapter 3. Joint channel, AoA, and AoD Estimation for System with UPA 21
3.1 Joint AoA and AoD estimation for UPA 21
3.1.1 Structure of UPA system 22
3.1.2 System model and Joint AoA, AoD estimation 23
Chapter 4. Simulations 26
4.1 Scenario 26
4.2 Simulation results of joint channel, AoA and AoD estimation 28
Chapter 5. Experiments 41
5.1 System overview 41
5.1.1 Environmental set up 43
5.1.2 Direct power scan method 45
5.2 Experiments 45
5.2.1 AoA estimation on X-Z plane 46
5.2.2 AoA estimation on 45°-rotated X-Z plane 49
5.2.3 AoA estimation on Y-Z plane 51
Chapter 6. Conclusions 53
References 54

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