Physical Layer Algorithm Based on Channel Feature and Random Interpolation

doi:10.3969/j.issn.1006-2475.2020.04.018

Abstract

Abstract: The article studies the present safety situation of wireless communication system and the necessity of protecting physical layer security. Combined with the secret key generation method of wireless channel, a physical layer security algorithm for random interpolation based on the parallel modulation mode of Orthogonal Frequency Division Multiplexing (OFDM) system is proposed. The core idea of the algorithm is as follows, under the control of public secret key, data symbols which are output after Inverse Fast Fourier Transform (IFFT) are interpolated randomly, and the original OFDM symbol is reconstructed to make it difficult for illegal users to correctly demodulate the signal, so as to protect the security of transmission information. The algorithm is based on physical layer encryption, which can better protect air interface and wireless link. And the process of parallel encryption can reduce the complexity of communication system implementation. The results of theoretical analysis and simulation show that the algorithm can effectively withstand all kinds of illegal attacks, has little influence on the original performance of communication system, can be well adapted to multipath channel, and has a good ability to withstand multipath fading.

Key words: physical layer security, channel characteristics, secret key generation, Orthogonal Frequency Division Multiplexing (OFDM), random interpolation

CLC Number:

TN918.91

WU You, CHEN Cheng, JIN Long. Physical Layer Algorithm Based on Channel Feature and Random Interpolation[J]. Computer and Modernization, doi: 10.3969/j.issn.1006-2475.2020.04.018.

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