помехоустойчивость, ofdm, papr, precoding, nonlinear distortion, rotation of signal constellation, discrete functions, distribution function, ber, energy efficiency, Physics, QC1-999, Electronics, TK7800-8360

In this work the peak-factor decreasing method for the OFDM systems is proposed, based on the group spectrum subcarriers processing and the signal constellation rotation. Such parameters of the OFDM system as the instantaneous value of the peak-factor, the bit error probability of the receiving signal, the selective (empirical) distribution function of the peak-factor values depending on the precoding functions are estimated. An experimental research confirming the effectiveness of the proposed method was carried out. Theoretical work significance consists in discrete functions using for precoding and simultaneous signal conversion on each subcarrier. Practical novelty consists in the possibility of using the developed method of reducing the peak factor in the DVB-T2 standard digital television systems. The application of the proposed method will make possible the fully use of the power amplifiers operation range and to avoid nonlinear signal distortions. The receiving BER level will decreased by the signal constellation rotation to the recommended angle for the given modulation type.