UDC
621.391.072
Noise immunity of
reception of signals with quadrature amplitude modulation in the presence of
interference with phase-shift keying
G. V. Kulikov1,
A. A. Lelyuh1,2, E. V. Batalov1, P. E. Kuzelenkov1
1 MIREA – Russian
Technological University, Vernadsky av. 78, Moscow, 119454,
Russia
2 JSC «Moscow Research Institute
of Radio Communications»,
Nizhegorodskaya 32,
Moscow, 109029, Russia
The
paper is received on May 7, 2019, after correction - on June 18, 2019
Abstract. Signals
with multi-position quadrature amplitude modulation, due to their spectral and
energy characteristics, have been used long and successfully in the
high-capacity digital data transmission systems, e.g., in the present-day
satellite communication lines. The spectral efficiency of such signals
increases with increasing number of the positions, but at the same time the
noise immunity of their reception decreases. In real data transmission radio
systems the receiver input along with the noise may have other kinds of
interference, both casual and intended. The interference with phase-shift
keying is one of the most commonly known, e.g. an interfering narrow-band
signal from an adjacent radio station. The article analyzes the noise immunity
of receiving signals with multi-position quadrature amplitude modulation in the
presence of noise and interference with phase-shift keying by methods of
statistical radio engineering. For this purpose, statistical characteristics of
the processes distributions at the outputs of correlation receiver’s
integrators were calculated. The distributions of all mentioned random
processes accounting for a white Gaussian noise present at the demodulator’s
input were taken as normal. Then, by averaging over the interference’s random
initial phase the dependencies of a bit error probability from the
signal-to-noise ratio, interference intensity and its shift relative to the
signal’s central frequency were obtained. It is shown that with increase of
positions number of the signals, the noise immunity of the reception against
the background of interference with phase-shift keying is greatly reduced and
even low-level interference cause a significant energy loss. With an increase
in the relative transmission rate of interference, its damaging effect
decreases, but remains very noticeable in a wide frequency range.
Keywords: quadrature amplitude shift
keying, interference with phase-shift keying, noise immunity, bit error
probability.
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For citation:
G. V. Kulikov,
A. A. Lelyuh, E. V. Batalov, P. E. Kuzelenkov.
Noise immunity of
reception of signals with quadrature amplitude modulation in the presence of
interference with phase-shift keying.
Zhurnal
Radioelektroniki - Journal of Radio Electronics. 2019. No. 7. Available at http://jre.cplire.ru/jre/jul19/10/text.pdf
DOI 10.30898/1684-1719.2019.7.10