FIELD: radio engineering and communications.
SUBSTANCE: invention relates to radio engineering and can be used in communication systems. In the method for compensating a band-limited interference by approximating its amplitude values, the signals are generated by amplitude, frequency or phase shift keying and transmitted as information symbols, each of which contains a time interval in which there is no signal, and an interval in which interference and signal are present. Four samples of the interference is taken at the same time intervals during the interval in which the signal is absent and N samples – during the interval in which the signal and the interference are present. Using the method of linear approximation, for the first and second values of the interference samples, an estimate of the value of the third sample is calculated, for the second and third values of the interference samples – the fourth sample, and the corresponding errors of the third and fourth samples. For each subsequent moment of sampling starting from the fifth, the values of the amplitude of the interference as a sum, the calculated values of the amplitude of the interference and the error in estimating the values of its amplitude are determined. And the amplitude value of the signal is determined for the Nth sample as the difference between the sample of the signal and interference mix and the calculated value of the interference amplitude. Efficiency of the proposed method for narrow-band interference for the "interference amplitude estimation error" parameter exceeds the efficiency of the prototype method from 7 to 60 times, depending on the number of frequency components of the interference and the ratio of the signal bandwidth to the value of its lower frequency, for interference of additive white Gaussian noise (AWGN) type it exceeds the efficiency of the prototype method for the "ratio of interference and signal power" parameter, with a given level of decision error, by more than 5 times.
EFFECT: increased noise immunity of communication equipment under the influence of narrowband and broadband noise such as AWGN.
1 cl, 3 tbl, 2 dwg
