Figure 3 | Scientific Reports

Figure 3

From: Enhanced cognitive demodulation with artificial intelligence

Figure 3

Thermal emitter calibration demonstrated for the 2 m single-channel ‘THz Torch’ wireless link field trial: (a) Contour plot of error function in Eq. (19) that depends on \(W_R\) and \(C_e\) (\(k_e\) is fixed to \(1.03\times {10}^{-3}\) W/K for visualization purposes). Optimization progress of the gradient descent and Newton-Raphson methods are indicated by the triangular and circle markers, respectively. (b) Synchronized received noisy signal with two expected noiseless signals that adopt the initial and optimized emitter parameter values.

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