Analysis of Discrete Data Transmission and Noise Immunity in a Short-Range UHF Radio Channel

Obtaining sufficiently high bandwidth and noise immunity of transmitted discrete data is achieved by using a super-high-frequency short-range radio channel. The features of duplex data exchange between various sensors of the system, as well as an algorithm for detecting their communication establishment are described. The probabilities of correct and false detection are found for this algorithm. It is shown that the speed of movement of the mobile module located on the vehicle, as well as the radio visibility range of the point sensor will determine the amount of transmitted data. The characteristic dependences for the radio visibility range are given. It is shown that noise immunity of the radio line can be described by the probability of error when transmitting a signal element. It is shown that signal fading caused by interference of direct and reflected from the underlying surface fields in the receiving aperture is critical for the noise immunity of the short-range radio channel. An expression for determining the modulus of the attenuation multiplier is obtained. The error probability is found for the case of a uniform distribution of the signal phase. The noise immunity of the radio line during fading of the received signal is determined for cases of a steady “shiny” point and of a large number of equivalent reflection points. The dependences of the error probability during signal transmission are obtained, taking into account both the value of the signal/noise ratio and the actual conditions of propagation of electromagnetic waves including reflections from the underlying surface.