Noise immunity of radio communication systems with noise-like BPSK signals under the action of retransmitted compensation interference such as inversion of the envelope signal

 

V. V. Voznuk, E. V. Kutsenko

Military Space academy named after A.F. Mozhaisky, Zhdanovskaya str.  13, Saint-Petersburg 197198, Russia

 

The paper is received on October 14, 2017, after correction - on February 5, 2018

 

Abstract. The article presents a mathematical model of the impact of compensatory relayed interference such as inversion of the signal envelope on a radio communication systems (RCS) using BPSK signals. Research of noise immunity of these systems was carried out by evaluating the average error probability on the transmitted information bit. On the basis of the analysis of the negative impact of relayed interference compensation such as inversion of the signal envelope at error-correcting RCS using BPSK signals the potentially high impact of such interference is confirmed, even in cases when the signal-to-noise ratio becomes significantly (in 5-10 times) lower than base values of the broadband signal, which is not characteristic of traditional broadband and narrowband noise. Achievement of high performance of the considered noise significantly depends on the time delay relative to the interference suppressed signal and the location of the repeater in the propagation path of the signal. The detuning of the frequency parameters of noise considered interference and suppress the signal does not affect the probability of bit error. The considered interference can be significantly improved if the controlled repeater gain is used, the values of which should be chosen based on the inverse envelope rule of the autocorrelation function of the pseudo-random sequence used in the formation of the suppressed signal, as well as the possibility of adjusting the phase incursion in the repeater. Along with the use of the method of forming the relayed interference compensation in the form of the inversion signal envelope it is necessary to consider the method of generating relayed compensating interference such as direct  signal inversion. The obvious way of dealing with these disturbances is, on the one hand, an increase of the base of noise-like BPSK signal, and on the other, an increase of carrier frequency. The first measure will reduce the harmful effect of the noise component of relayed interference, the second measure will significantly reduce the number of energy-efficient spatial positioning of the repeater-jammer.

Key words: relayed interference, ECM-resistance, complex signals, compensating and the impact on the bandwidth of noise interference, the average probability of bit error.

References

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For citation:
V. V. Voznuk, E. V. Kutsenko. Noise immunity of radio communication systems with noise-like BPSK signals under the action of retransmitted compensation interference such as inversion of the envelope signal. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 2. Available at http://jre.cplire.ru/jre/feb18/1/text.pdf

DOI  10.30898/1684-1719.2018.2.1