Fig. 4: The subcarrier EVMs (EVMs, error vector magnitudes) at different subcarrier indices. | Communications Engineering

Fig. 4: The subcarrier EVMs (EVMs, error vector magnitudes) at different subcarrier indices.

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

Fig. 4

The subcarrier EVMs of a 10-Gbps/26-GHz (x-polarisation; upstream) and 10-Gbps/38-GHz (y-polarisation; downstream), and b 1-Gbps/3.7-GHz (x-polarisation; upstream) and 1-Gbps/4.4-GHz (y-polarisation; downstream) 16-QAM-OFDM (16-QAM-OFDM, 16-quadrature amplitude modulation-orthogonal frequency-division multiplexing) signals at different subcarrier indices. Red rhombus/line indicates 10-Gbps/26-GHz signal (x-polarisation; upstream), blue triangle/line indicates 10-Gbps/38-GHz signal (y-polarisation; downstream), black square/line indicates 1-Gbps/3.7-GHz signal (x-polarisation; upstream), and brown circle/line indicates 1-Gbps/4.4-GHz signal (y-polarisation; downstream). The error bars represent the standard deviations of the measured data from three experimental trials.

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