Design of Strong Signal Masking Covert Communication Transmission Scheme Based on OFDM System

Strong Signal Masking is an anti-interception technology that covers the effective signal by using known signals with strong power characteristics, which not only ensures receiving accuracy of cooperators, but also increases receiving difficulty of non-cooperators and reduces accuracy of intercepted data. In this paper, Strong Signal Masking is combined with Orthogonal Frequency Division Multiplexing (OFDM) and anti-intercepting transmission scheme in physical layer is taken as the research direction. The paper focuses on bit error rate (BER) of effective signals under the cover of known signals as well as similarity of data intercepted by non-cooperators. Random data and Preamble data are used as known signals respectively for hidden transmission of effective data. In addition, preamble sequence data mirroring masking mechanism is proposed to reduce the BER of effective data. Simulation results show that BER performance of preamble sequence data mirroring masking system is greatly improved with the same similarity of data intercepted.