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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Information leakage in bi-directional IFD communication system with simultaneously transmitted jamming sequence

  • Ju, Hyungsik (Hyper-connected Communication Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Gwak, Donghyuk (Hyper-connected Communication Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Kim, Tae-Joong (Hyper-connected Communication Research Laboratory, Electronics and Telecommunications Research Institute)
  • Received : 2018.12.19
  • Accepted : 2019.04.28
  • Published : 2020.02.07
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Abstract

In this paper, we describe a simultaneously transmitted jamming (ST-jamming) for bi-directional in-band full-duplex (IFD) system to improve information security at the physical layer. By exploiting ST-jamming, each legitimate user transmits data samples and jamming samples together in one orthogonal frequency division multiplexing symbol according to given traffic asymmetry. Regardless of the traffic difference in both directions in IFD communication, eavesdropping of confidential information is prevented in both directions simultaneously without the loss of data rate. We first propose an encoding scheme and the corresponding decoding scheme for ST-jamming to be used by the legitimate users. In addition, we study a transceiver structure of the legitimate users including a baseband modem uniquely designed for the use of ST-jamming. The leakage of confidential information at an eavesdropper is then quantified by studying the mutual information between the confidential transmit signals and the received signals of the eavesdropper. Simulation results show that the proposed ST-jamming significantly reduces the leakage of legitimate information at the eavesdropper.

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References

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