Figure 2
From: Remote sensing of soil moisture using Rydberg atoms and satellite signals of opportunity
A QPSK (quadrature phase shift key) signal with known bitstream is injected into the TEM/vapor cell to study signal-to-noise (SNR) after correlation with a reference waveform (a). The post correlation gains from the atomic readout demonstrated a gain close to the calculated Gc (correlator gain) (by − 3 dB) (b).
