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Hybrid Beamforming Transmitter Modeling for Millimeter-Wave MIMO Applications

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posted on 31.07.2020 by Parastoo Taghikhani
Hybrid digital and analog beamforming is an
emerging technique for high-data-rate communication at
millimeter-wave (mm-wave) frequencies. Experimental evaluation
of such techniques is challenging, time-consuming, and costly.
This article presents a hardware-oriented modeling method for
predicting the performance of an mm-wave hybrid beamforming
transmitter. The proposed method considers the effect of active
circuit nonlinearity as well as the coupling and mismatch in the
antenna array. It also provides a comprehensive prediction of
radiation patterns and far-field signal distortions. Furthermore,
it predicts the antenna input active impedance, considering
the effect of active circuit load-dependent characteristics. The
method is experimentally verified by a 29-GHz beamforming
subarray module comprising an analog beamforming integrated
circuit (IC) and a 2 × 2 subarray microstrip patch antenna.
The measurement results present good agreement with the
predicted ones for a wide range of beam-steering angles. As a
use case of the model, far-field nonlinear distortions for different
antenna array configurations are studied. The demonstration
shows that the variation of nonlinear distortion versus steering
angle depends significantly on the array configuration and beam
direction. Moreover, the results illustrate the importance of
considering the joint operation of beamforming ICs, antenna
array, and linearization in the design of mm-wave beamforming
transmitters.

History

Email Address of Submitting Author

parastoo.taghikhani@gmail.com

ORCID of Submitting Author

https://orcid.org/0000-0003-1936-507X

Submitting Author's Institution

Chalmers University of Technology

Submitting Author's Country

Sweden

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in IEEE Transactions on Microwave Theory and Techniques

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