Increasing Noise Immunity Between LEO Satellite Radio Channels

Abstract

The use in wireless telecommunication systems of radio signals based on harmonic (sinusoidal) carrier oscillations is not optimal in terms of the efficiency of converting the current energy in the antenna into the energy of electromagnetic waves. This is especially true of satellite communication. This is due to the fact that according to Maxwell's equations of electromagnetic field theory, the radiated energy of the electromagnetic wave by the antenna is proportional to the time current derivative. One of the areas of development of low-orbital systems is the creation of systems with a "distributed satellite" architecture, which is focused on solving complex multifunctional problems using cubeSats. To provide communication within a "distributed satellite", wireless networks are used, as well as terahertz interconnect lines, which are multipath and non-stationary. In order to increase the noise immunity of inter-satellite communication low Earth orbit (LEO), it is proposed to use an advanced method of "non-energy" receiving sequences of Impulse-Radio Ultra-Wideband (IR-UWB) signals, which provides signal processing without taking into account their energy. In addition, this method allows to receive IR-UWB signals received at the input of the receiver in asynchronous form by correlative processing passively matched with the signal filter. Applying a wavelet analysis algorithm to the receiving device increases the noise immunity of the device when receiving a pulsed IR-UWB signal by at least 4 dB in the conditions of noise and interference, which allows to conduct a secure exchange of information in conditions where a useful signal at the input of the receiver of the system communication does not exceed the noise level.