Efficiency of digital compensator of strong non-Gaussian interference

A digital compensator of strong non-Gaussian wideband interference is considered which contains a band limiter, a subtractor, first and second multipliers, and a low-pass filter with a transfer function K = 1/pT as a bridge between the two multipliers. The interference suppression factor of such a compensator is calculated, considering that the phase distribution in the high-frequency region will be the same at all points along the compensator structure only when there is no parasitic phase shift of the voltage in the band limiter and in the second multiplier. The interference suppression factor is, accordingly, inversely proportional to the sine of the phase shift squared. A digital compensator thus ensures a higher stability of phase characteristics than does an analog one. Conversion from analog to digital compensation involves quantization of the orthogonal input signal components as well as of the limiter output signal and time discretization with numerical solution of the resulting difference equation which describes the compensation process. The efficiency of such a compensator was evaluated by the method of statistical simulation, with either a harmonic oscillation with known phase or an oscillation with phase-keyed pseudorandom M-sequence as a model signal.