Methods to Form Both Anti-Interference and Hiding Radio Signals for Prospective Communication Systems
Sergey Nikolaevich Kirillov, Alexander A. Lisnichuk, Ivan V. Lukasin, Pavel S. Pokrovskij · 2019
In order to more protect wireless prospective communication systems (PCS), methods are proposed for increasing the level of both interference immunity and hiding for synthesized radio signals. It was shown that in the presence of additive “white” Gaussian noise and signal-like interference the developed method of radio signal adaptation PCS provided the gain in noise immunity was up to 5 dB compared to the DSSS QPSK signal with spreading by the ensemble of supplemented MLS. For choice radio signal that is resistant to structure analysis, the set of radio signals with controlled coupling between in-phase and quadrature components synthesized using combined criterion “spectral efficiency - peak-to-average-power-ratio” was considered. Meanwhile, these radio signals are comparable with the known types of bandwidth-efficient radio signals in terms of the general spectral and energy characteristics. The training sequence to reduce symbol time and carrier frequency estimation variance in operation of the PCS in multipath is produced. It is shown that synthesized training sequence allows reducing the variance of the symbol time offset estimate by 1.5-1.8 times and carrier frequency offset is 1.2-1.4 times.