SYNTHESIS METHOD OF SUBOPTIMAL SEPARATION-DEMODULATION ALGORITHM OF TWO MUTUALLY NON-ORTHOGONAL QPSK SIGNALS

Abstract

The purpose of the work is to improve the immunity of reception (demodulation) of a useful CS with QPSK under the influence of powerful similar interference. Formulation of the problem. Develop a rule for making a decision about the transferred DP of a useful CA with QPSK under the influence of strong QPSK interference. Results. The article presents the synthesis of a suboptimal demodulation algorithm of two synchronous mutually non-orthogonal digital signals with QPSK modulation. In the absence of interference, this algorithm degenerates into the classic coherent demodulation of a digital signal with QPSK. Conclusion. When the instantaneous power of the interference is significantly higher than the instantaneous power of the useful digital signal with QPSK, the immunity of reception of the latter approaches the immunity of reception in a channel with additive white Gaussian noise without interference.