An efficient particle filtering algorithm for demodulation of M-PSK signals at the background of non-Gaussian noise is proposed. The state-space model of the observation signal is formulated including the dynamics of channel parameters' updating. The resulting estimation of informative symbols and channel parameters is done in two parallel contours. The simulations for QPSK signals have shown that for a sufficiently high number of particles the proposed method outperforms classical demodulation approach based on Gardner and Costas loops.

The method for the detection of Carrier-in-Carrier signals based on the calculation of fourthorder cumulants is proposed. In accordance with the methodology based on the "Area under the curve" (AUC) parameter, a threshold value for the decision rule is established. It was found that the proposed method provides the correct detection of the sum of QPSK signals for a wide range of signal-to-noise ratios. The obtained AUC value indicates the high efficiency of the proposed detection method. The advantage of the proposed detection method over the "radiuses" method is also shown.

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