At the same time an increasing trend at 1800 MHz is also observed.
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5G EMF Exposure at 3.6 GHz in Greece Using Data From Frequency-Selective Monitoring Sensors.
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The sentences
They are intended to provide an overall trend of the E‐field levels at 3.6 GHz frequency band, using the measurement data of this study, and were obtained in MATLAB using a function that implements singular spectrum analysis (SSA), which is a useful algorithm when the periods of the seasonal trends are unknown and the time series data are uniformly spaced.