Fig. 2: Downstream/upstream BERs (BERs, bit error rates)/EVMs (EVMs, error vector magnitudes). | Communications Engineering

Fig. 2: Downstream/upstream BERs (BERs, bit error rates)/EVMs (EVMs, error vector magnitudes).

From: Two-way free-space optics-based interface between fibre and 5G communication employing polarisation-orthogonal modulation

Fig. 2

Downstream/upstream a BERs and b EVMs at different received MMW (MMW, millimetre-wave)/sub-6 GHz powers over 25-km SMF (SMF, single-mode fibre), 1-km FSO (FSO, free-space optics), and 20-m (MMW)/10-m (sub-6 GHz) RF (RF, radio-frequency) wireless cascaded-medium. Black square/line indicates 1-Gbps/3.7-GHz signal (x-polarisation; upstream), brown circle/line indicates 1-Gbps/4.4-GHz signal (y-polarisation; downstream), red rhombus/line indicates 10-Gbps/26-GHz signal (x-polarisation; upstream), and blue triangle/line indicates 10-Gbps/38-GHz signal (y-polarisation; downstream). The error bars represent the standard deviations of the measured data from three experimental trials.

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