Increasing the interference immunity of mobile digital combined microwave radio engineering systems
DOI:
https://doi.org/10.26906/SUNZ.2025.1.196-200Keywords:
pseudo-random frequency hopping, phase-shift keyed signal, wideband signal, spread spectrum systemAbstract
In the article evaluates the interference immunity of the joint system pseudo-random frequency hopping – wideband signals. It is known that mobile digital combined microwave radio engineering systems use phase-shift keyed wideband
signals and pseudo-random frequency hopping. The mobile digital combined troposcatter-space system also uses phase-shift keyed
wideband signals and pseudo-random frequency hopping. The use of a joint system of pseudo-random frequency hopping - wideband signals is due to the requirement for stable operation of any radio engineering system in the conditions of a complex interference environment created by enemy radio suppression stations. The article analyzes the relevant literature. The schemes of the
transmitter and receiver for the formation and reception of a joint pseudo-random frequency hopping - a wideband signal are given.
The peculiarity of these schemes is that the transmitting and receiving microwave paths are implemented on rectangular waveguides
partially filled by a dielectric. The influence of barrage noise interference on the interference immunity of such a receiver is investigated in the article. The probability of error per bit for QPSK modulation under the influence of white Gaussian noise and barrage
interference is shown. The expression for the probability of error per bit is written through the Crump function. The probability of error
per bit is found under the conditions that the interference spectrum exceeds the spectrum of the wideband signal and under the condition
that the interference spectrum is narrower than the spectrum of the wideband signal. The article calculates the dependences of the
probability of error per bit on the ratio of the signal power to the total power of noise and interference for different values of the spectral
expansion coefficients for the cases of using only pseudo-random frequency hopping, only a wideband signal and joint pseudo-random
frequency hopping – wideband signal. It is concluded that taking into account the presence of a protection device in the receiver of
a wideband signal, under conditions of interference in part of the band, the noise immunity of the joint system is higher than the
interference immunity of a pseudo-random frequency hopping system or a system using a wideband signal.
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