Active Transmitter Antenna Array Modeling for MIMO Applications
In this thesis, a technique for modeling the active transmitter antenna array performance is presented. The proposed model considers the effect of PAs nonlinearity as well as the coupling and mismatch in the antenna array. With this model, a comprehensive prediction of radiation pattern and signal distortions in the far-field is feasible. The model is experimentally verified by a mmWave active subarray antenna for a beam steering scenario and by performing over-the-air measurements. The measurement results effectively validate the modeling technique for a wide range of steering angles.
Furthermore, a linearity analysis is provided to predict transmitter performance in conjunction with beam-dependent digital predistortion (DPD) linearization. The study reveals the model potential in evaluating different DPD approaches as well as predicting the performance of linearized transmitters. The demonstration shows that the variation of nonlinear distortion versus steering angle depends significantly on the array configuration and beam direction.
In summary, the proposed model allows for the prediction of the active transmitter antenna array performance in the early design stages with low computational effort. It can provide design guides for developing large-scale active arrays and can be employed for evaluating the DPD and transmitter linearity performance.
Active antenna array
hybrid beamforming transmitter
far-field nonlinear distortion
Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik, Mikrovågselektronik
Hybrid Beamforming Transmitter Modeling for Millimeter-Wave MIMO Applications
Silicon-based Ka-band massive MIMO antenna systems for new telecommunication services (SILIKA)
Europeiska kommissionen (Horisont 2020), 2016-09-01 -- 2020-08-31.
Annan elektroteknik och elektronik
Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 431
Chalmers tekniska högskola
Opponent: Per Landin (Ericsson)