MIMO 안테나 측정을 위한 개선된 알고리즘에 관한 연구 = A Study on Improved Algorithm for MIMO Antenna Measurement

다국어 초록 (Multilingual Abstract)

This thesis presents the improvement of algorithm for antenna measurement software and development of measurement testbed for multi-input multi-output (MIMO) antenna measurement. Firstly, the algorithm for antenna measurement software is improved to operate with variety types of equipments and reduce measurement noise. After that, this software is used to measure 3 parameters of MIMO antennas. Finally, to measure other parameters of MIMO antennas and MIMO systems, the MIMO testbed is developed and presented. As the results, the improved software can be used to measure gain, 2D & 3D radiation pattern, for single antenna, and polarization, pattern diversity, polarization diversity and pattern correlation, for MIMO antenna. The measurement results are very beautiful when the noise filter algorithm is applied. In MIMO testbed design, direct conversion technique is used for analog front end circuit design. Front end circuits are also coupled with baseband DSP algorithm. The result is that front end circuits have compact size and wide bandwidth. Finally, hardware and software configurations of MIMO testbed are designed and presented.

목차 (Table of Contents)

• 1. Introduction = 7
• 2. Algorithm of antenna measurement software with noise reduction = 9
• 2.1 Objective = 9
• 2.2 Improvement of software structure = 9
• 2.2.1 Measurement configuration and new software structure = 9
• 2.2.2 Measurement results = 12
• 2.3 Filter algorithm for noise reduction = 17
• 2.3.1 Filter algorithm = 18
• 2.3.2 Experimental results of filter algorithm = 22
• 2.4 Summary = 27
• 3. Measurement of key parameters of MIMO antenna = 28
• 3.1 Objective = 28
• 3.2 Measurement configuration = 29
• 3.2.1 Pattern diversity, polarization diversity and calculation of pattern correlation = 29
• 3.2.2 Measurement of mutual coupling = 30
• 3.3 Results and discussions = 30
• 3.3.1 Pattern diversity and polarization diversity = 30
• 3.3.2 Pattern correlation = 33
• 3.3.3 Mutual coupling = 33
• 3.4 Summary = 34
• 4. Design of multi-band MIMO test-bed = 35
• 4.1 Objective = 35
• 4.2 Design of analog RX circuit = 37
• 4.2.1 Receiver Architecture and Signal Analysis = 37
• 4.2.2 Simulation and Measurement Results = 40
• 4.3 Design of analog TX circuit = 46
• 4.3.1 Transmitter architecture and signal analysis = 47
• 4.3.2 Fabrication and Measurement Results = 48
• 4.4 Design of 2x2 MIMO measurement system = 52
• 4.4.1 Hardware configuration = 52
• 4.4.2 Software configuration = 52
• 4.5 Summary = 54
• 5. Conclusion = 56
• References = 57