Application of frequency-hopping OCDM-OFDM signals for physical level attacks preventing

Аuthors

Karpuhin E. О.^*, Makarenkov N. S.^**

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: ret1987@yandex.ru
**e-mail: nik.makarenkov95@gmail.com

Abstract

It is utterly important to ensure the intentional radio jamming resistance for information and communication systems of special and military purpose. Attacks on such kind of networks may inflict vast damage, including a State level. Simulated jamming exercises the most dangerous impact among the existing intentional interferences, since they repeat the signal structure while its transmission. The impact of such kind of interferences may also disrupt the information availability while attempting to get access to it through a radio channel.

The presented work proposes application of frequency-hopping OCDM-OFDM signals to counteract the physical level attacks of OSI model and enhancing the signal structural stealth. Jamming immunity from the relay interference, indicators of structural stealth, and the impact from Doppler effect were considered. Simulation revealed the energy gain of 1 dB while employing the suggested signal-code structure prior to frequency hopping OFDM signals in conditions of relay interference. It demonstrated also that the signals of this type possess higher structural stealth figures, as well as more stable to Doppler effect compared to OFDM-frequency hopping signals.

The disadvantages of the proposed approach include the complexity increase of the signal-conditioning and synchronization systems on both the receiver and transmitter. It is necessary to ensure assignment of code signature from the earlier generated OCDM to each each subcarrier of the OFDM signal while the signal forming process. Besides, the frequency-hopping spread spectrum process is rather complicated itself. It requires fine synchronization between the receiver and transmitter, as well as knowing the pseudo-random sequence. The suggested signals will be less effective while data transmission in the channel without attacker, than the structure with FH-OFDM application.

Keywords:

orthogonal frequency-division multiplexing, orthogonal code division multiplexing, frequency-hopping spread spectrum, low-density parity-check code, Doppler effect

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