Abstract
The results of noise immunity studies of signal structures based on signals with orthogonal frequency multiplexing (OFDM signals) for multipath propagation and in the presence of additive spectrum-focused interference (SFI) are presented. It has been shown that the algorithms for receiving these signal constructs are based on SFI compensation, the essence of which is non-linear processing of input implementations by limiting or switching off spectral components with weight processing of input implementations. Noise immunity analysis was carried out for a number of investigated signal structures with variation of their base using a low-density noise immunity code with a code rate of 1/2 and using a Kaiser weight window. It is shown that the most efficient is nonlinear processing with the mode of switching off the spectral components - the energy gain when applying the mode of switching off reaches 1.5 dB in relation to the mode of limitation. It is also shown that with respect to the channel with additive white Gaussian noise energy losses in the presence of SFI for signal structures with a base of 9 dB do not exceed 3.85 dB while the theoretical estimate of the required signal base for reliable information transmission on this channel exceeds 20 dB.
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