| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 103 === In this thesis, we formulate a channel emulation problem with practical constraints in a 3D MIMO OTA testing system and solve for the optimal power weights for each probe antenna. When using conventional algorithms to calculate the optimal power weights, the reconstruction errors may be large in some directions. We propose a min-max algorithm to suppress the maximum error. Moreover, to reduce the setup cost, we propose a probe antenna selection algorithm to reduce the number of active probe antennas while keeping the accuracy of the testing. In addition, we use the minimum variance distortionless response (MVDR) beamformer to estimate the angle information in real environments and regenerate the channel characteristics in the anechoic chamber. Finally, simulation results show that the proposed algorithm presents a better accuracy compared with the conventional algorithms and can determin the optimal power weights accurately based on the estimated angle information to reconstruct the channel characteristics in the chamber.
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