Non-linearities in radio-frequency transceiver hardware, particularly in power amplifiers, cause distortion in-band and out-of-band. Contrary to claims made in recent literature, in a multiple-antenna system this distortion is correlated across the antennas in the array. A significant implication of this fact is that out-of-band emissions caused by non-linearities are beamformed, in some cases into the same direction as the useful signal.
CITATION STYLE
Larsson, E. G., & Van Der Perre, L. (2018). Out-of-band radiation from antenna arrays clarified. IEEE Wireless Communications Letters, 7(4), 610–613. https://doi.org/10.1109/LWC.2018.2802519
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