Analysis of Narrow-Band Interference Effect on Cognitive Radio Systems Based on Synthesized Four-Position Radio Signals

摘要

The analysis of narrow-band interference effect on cognitive radio communication systems was carried out. In these systems, multi-criteria synthesis of radio signals is realized, taking into account the following quality indicators: noise immunity to the action of narrow-band interference and additive “white” Gaussian noise; peak-factor (energy efficiency of signals) and the level of out-of-band radiation. To study the realized quality indicators, the variety of synthesized signals was analyzed. A comparative analysis was carried out with existing systems using QPSK signals and narrow-band rejection on the receiving side. It is shown that cognitive radio systems based on synthesized four-position signals provide the gain on noise immunity up to 7 dB in comparison with the systems with QPSK signals and harmonic interference rejection.