Study of synchronization system for signal recovery from USB-keyboard compromising emanations in conditions of industrial noise

An automatic control (recovery) system for reception of USB-Keyboard Compromising Emanations has been developed in condition of non-Gaussian noise. Synthesized system consists of three interconnected parts: the record unit, the optimal recovery unit, and sensitive extraction unit. As the noise both Gaussian and non-Gaussian discrete random processes are considered. Non-Gaussian processes have Johnson distribution and allow approximating accurately the most of distribution laws of really existing artificial processes. The system has been implemented as digital model in LabView software. At the first stage the correlation extracts the signal and defines first sample arrival time. At the second stage synthesized optimal receiver recovers information sequence. It has been proved the use of developed recovering algorithm is feasible under conditions of a priori unknown signal and noise parameters when maximum of cross-correlation function synchronizing.