This paper shows how digital predistortion of a phased array can benefit from the parametric variations over parallel power amplifiers (PAs). Different antenna configurations are simulated by varying the PA input drive levels by the Monte-Carlo method. The error vector magnitude (EVM) at the steering angle and total radiated adjacent channel power ratio (TRACPR) are used as performance metrics. The simulation results indicate that array predistortion can benefit from the variations between the PAs to improve the EVM significantly. However, at the same time, the TRACPR performance is reduced. This gives a new trade-off to balance between in-band and out-off-band distortion in the fifth generation beamforming systems.
Tervo Nuutti, Leinonen Marko E., Aikio Janne, Rahkonen Timo, Pärssinen Aarno
A4 Article in conference proceedings
Place of publication:
2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)
20 December 2018
N. Tervo, M. E. Leinonen, J. Aikio, T. Rahkonen and A. Pärssinen, “Analyzing the Effects of PA Variations on the Performance of Phased Array Digital Predistortion,” 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Bologna, Italy, 2018, pp. 215-219. doi: 10.1109/PIMRC.2018.8580706
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