Optimal input power back-off with nonlinear power amplifier for electric power systems

The nonlinear distortion from power amplifier (PA) distorts the signal and causes significant impact on the symbol-error-rate (SER) performance for the electric-power-systems (EPS) communications. This paper proposes a calculation of the optimal input power back-off (IBO) to resist PA nonlinearity, as well as guarantee an appropriate signal-to-noise ratio (SNR), by minimizing the mean square error (MSE) between the received symbols and the standard constellation points. Simulations indicate that the optimal IBO is variable and increases as the noise level grows. In addition, by using the calculated optimal IBO, the SER performance is better than that by using other fixed IBO values, showing impressive significance of the proposed method.