Channel Modeling, Capacity Analysis, and Transceiver Design for Polarized Array Antenna Systems

Channel Modeling, Capacity Analysis, and Transceiver Design for Polarized Array Antenna Systems
Other Titles
편파 배열 안테나 시스템을 위한 채널 모델링, 용량 분석 및 송수신 구조
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Recently, there has been a gradual increase in the demand for polarized antenna systems, especially for 5G networks. This is mainly because antenna polarization is an important resource employed for the design of space-limited wireless devices. Several techniques such as space-time diversity, multiplexing, and array processing with antenna polarization can be exploited in order to boost the system performances. Therefore, many published research articles as well as ongoing projects have focused on antenna polarization. However, some of the research topics such as the channel modeling, capacity analysis, and transceiver design regarding antenna polarization are still in the early stages or not fully developed. This dissertation focuses on the development of polarized array antenna systems with the research topics including 3D channel modeling, capacity analysis, and transceiver design.
For the channel modeling, I assess several existing channel models supporting antenna polarization, and the advantages and disadvantages of the existing models are clearly summarized. To maintain the advantages (e.g., supporting the MIMO array extension and considering the antenna radiation pattern) and overcome the disadvantages (e.g., reducing the modeling complexity but preserving the accuracy), I propose a 3D channel model for polarized MIMO (CM3D-PMIMO) systems. Similar to conventional works, the proposed CM3D-PMIMO is verified via correlations between the polarized links. Monte Carlo simulation reliability for a performance evaluation of MIMO technologies under CM3D-PMIMO is also validated.
Moreover, I derive the capacity of polarized uniform linear array (PULA) systems by using the beamforming (BF) technique under a practical scattering environment. The results show that for PULA systems, the channel capacity, which is boosted by BF diversity, can be determined using the channel gain, beam radiation pattern, and BF diversity order (BDO), where the BDO is dependent on the antenna characteristics and array configurations.
In order to boost the performance of cell-edge users, I propose a robust transceiver to explore STBC and BF simultaneously via a triple-polarized uniform linear array (TPULA) system, which relies on the particular characteristics of the polarized array antenna systems. That is, the cross-branch links in the TPULA system are usually uncorrelated, while the cross-array links can be highly correlated by setting the array element space equal to, or less than, a half-wavelength. After that, I additionally design the polarized M-MIMO (PM-MIMO) system associated with the 3D-BF applications for 5G system, where an effective array selection scheme is proposed. This scheme addresses to optimize the beam-width and tries to maintain the system performance by the exploration of 3D-BF diversity and 3D-BF multiplexing gains. Based on the Long Term Evolution-Advanced (LTE-A) specification under the proposed CM3D-PMIMO, the simulation results finally confirm the validity of my proposed schemes.
Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivations 2
1.2.1 Practical Channel Modeling with Low Complexity 2
1.2.2 Capacity Analysis with Beamforming 4
1.2.3 State of the Art of Transceiver Design 5
1.3 Organization of Dissertation 6
Chapter 2 Practical Channel Modeling with Low Complexity for Polarized Array Antenna Systems 7
2.1 Characteristics of Polarized MIMO Channel Model 7
2.1.1 Diversity and Multiplexing Exploration 7
2.1.2 Parameters Derivation 9
2.2 3D Channel Modeling for Use in Multi-Polarized Antenna Systems 15
2.3 3D Channel Modeling for Use in Multi-Polarized Array Antenna Systems 25
2.3.1 Modeling of 3D Scattering Environment 25
2.3.2 Azimuth and Elevation Angles of Scatterers with MS in Motion 29
2.3.3 Modeling of CM3D-PMIMO 33
2.3.4 Verification of CM3D-PMIMO by Correlations 38
2.3.5 Validation of CM3D-PMIMO by Beamforming Techniques 43
Chapter 3 Capacity Analysis for Polarized Array Antenna Systems with Beamforming 49
3.1 Feature Analysis of ULA 50
3.1.1 Array Factor 50
3.1.2 Off Bore-sight Angle 52
3.1.3 Number of Lobes for a Beam 53
3.2 Beam Radiation Pattern of PULA 55
3.2.1 Cross-array Beam Generation 56
3.2.2 PULA Beam Radiation Pattern in 2D Form 58
3.2.3 PULA Beam Radiation Pattern in 3D Form 61
3.3 Beamforming Diversity Order 64
3.4 Channel Capacity by PULA with Beamforming 69
Chapter 4 State of the Art of Transceiver Design for Polarized Array Antenna Systems 75
4.1 STBC with Beamforming for Diversity Exploration 75
4.1.1 TPULA System 77
4.1.2 Performance Verification of TPULA System 83
4.2 Diversity and Multiplexing Exploration by Polarized Massive MIMO 87
4.2.1 Polarized Massive MIMO System 88
4.2.2 Array Element Selection for 3D Beamforming 90
4.2.3 Channel Estimation 97
4.2.4 3D Beamforming Diversity Employment 103
4.2.5 3D Beamforming Multiplexing Employment 112
4.2.6 Consideration of Mismatched Orthogonality for Co-located Antenna Branches 117
Chapter 5 Conclusions 120
References 122
Acknowledgement 130
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Graduate School (일반대학원) > Theses(IT미디어융합 석박사 학위논문)

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