Implementation method of Wheatstone bridge for absolute secure communication in physical layer

Junsong Gong; Sanjun Liu; Guohong Lai

doi:10.1117/12.2640927

2 December 2022 Implementation method of Wheatstone bridge for absolute secure communication in physical layer

Junsong Gong, Sanjun Liu, Guohong Lai

Proceedings Volume 12288, International Conference on Computer, Artificial Intelligence, and Control Engineering (CAICE 2022); 122882C (2022) https://doi.org/10.1117/12.2640927
Event: International Conference on Computer, Artificial Intelligence, and Control Engineering (CAICE 2022), 2022, Zhuhai, China

Abstract

In this paper, W-SIC, a circuit with self-interference cancellation ability based on Wheatstone bridge is proposed to realize the physical layer absolutely safe communication in wired mode. The communication parties use a coaxial cable to transmit information to each other in different frequency ranges. They send information signals in their respective frequency ranges and release artificial noise signals in each other's frequency range. When the eavesdropper eavesdropping on the coaxial cable, the signals in both frequency ranges have been polluted by artificial noise, the eavesdropper can’t obtain effective signals. However, they can easily eliminate self-interference signals by using W-SIC, receive only the signal sent. Because the two signals are in different frequency ranges, the target information can be easily obtained by filtering, downconversion and other processing by the receiving. Besides W-SIC circuit model, a high-precision sliding rheostat is proposed to more accurately realize Bridge balance inside it, the optimal eavesdropping position of the eavesdropper is analyzed, the channel capacity of legitimate recipients, the formula of self-interference residual factor, the formula of system security capacity and the channel capacity of eavesdroppers are derived. The simulation results show the effectiveness and feasibility of the research method proposed in this paper.

Citation Download Citation

Junsong Gong, Sanjun Liu, and Guohong Lai "Implementation method of Wheatstone bridge for absolute secure communication in physical layer", Proc. SPIE 12288, International Conference on Computer, Artificial Intelligence, and Control Engineering (CAICE 2022), 122882C (2 December 2022); https://doi.org/10.1117/12.2640927

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