DEVELOPMENT OF A SYNCHRONIZATION SYSTEM BASED ON COMPLEX BROADBAND SIGNALS
DOI: 10.36724/2072-8735-2020-14-5-4-14
Vitaliy S. Kuznetsov, National Research University of Electronic Technology, Moscow, Russia, vitaliy_kuznetsov@hotmail.com
Alexey S. Volkov, National Research University of Electronic Technology, Moscow, Russia, leshvol@mail.ru
Alexey V. Solodkov, National Research University of Electronic Technology, Moscow, Russia, solodkov_aw@mail.ru
Vladislav A. Doroshenko, National Research University of Electronic Technology, Moscow, Russia, doroshenko.vlad42@gmail.com
Abstract
In this paper different methods of receiving and detecting pseudonoise (PN) signals, as well as methods of confirming and reducing the probability of false synchronization, are considered. A method of detection a synchronization signal as part of a data packet is proposed, based on the zero response of the digital filter, generating an m-sequence when the same sequence is input. The structure of a complex cascade PN signal for synchronizing a frame from a selected user station, called a binding station in a time-division multiple access system, is proposed. The structure of the synchronization signal and the structure of information signals in the form of a PN sequence based on simplex codes having the best correlation characteristics are selected. A two-stage complex signal detection method as the synchronization sequence reception circuit is selected, where the first cascade is the incoherently summed outputs of the matched filters on the PN sequence subsets, allocated to the user, in quadrature branches, and the processing method based on the sequential estimation as the second cascade is proposed. Statistical simulation of the proposed signals and the algorithms for their processing in the conditions of additive white gaussian noise is carried out, the probabilities of missing the synchronization signal and false response were measured. For a synchronization sequence of the station signal with a total length of 32385 chips, the synchronization probability reaches 0.9 with an Ech/N0 ratio of at least -15.1 dB. An expression is proposed for estimating the probability of detecting a synchronization signal with its cascade structure and symbol-by-symbol reception. A theoretical expression is obtained for estimating the probability of a false response and signal detection for a synchronization circuit.
Keywords: broadband signal, pseudonoise sequence, synchronization, matched filtering, spread spectrum signals detection, complex signal.
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Information about authors:
Vitaliy S. Kuznetsov, Professor of the Department of Telecommunications, National Research University of Electronic Technology, Moscow, Russia
Alexey S. Volkov, assistant professor of the Department of Telecommunications, National Research University of Electronic Technology, Moscow, Russia
Alexey V. Solodkov, academic of the Department of Telecommunications, National Research University of Electronic Technology, Moscow, Russia
Vladislav A. Doroshenko, graduate student of the Department of Telecommunications, National Research University of Electronic Technology, Moscow, Russia