Multi-criterion radio signal synthesis and time discriminator development for prospective communication systems

For adaptation of prospective communication systems to an effect of narrow-band interferences the two-stage procedure was proposed which provides multi-criterion synthesis of radio signal based on the optimization of spread sequence ensemble. It is shown that this procedure supplies the advantage of noise-immunity by more than 4.5 dB when the signal-to-interference ratio is -7 dB. In addition, the synthesized radio signal with compared to radio signal based on the ensemble of supplemented maximum length sequence (MLS) has reduced the level of autocorrelation function side lobes by 10 % and improved the quality index that is indirectly correlated with noise immunity by 5 times in a case when errors of synchronization system are available. Special time discriminator was proposed to implement the prospective communication system, which uses universal shaper and demodulator of bandwidth-efficient radio signals. It is shown that this device is more stable to variate radio signal structure as compared with OQPSK-discriminator. Thus, at analyzed sample of bandwidth-efficient modulation types the reduction of a variate of S-curve slope by more than 2 times was obtained.