基于SDR的快跳频通信系统方案及实验

doi:10.11959/j.issn.1000-436x.2022155

Abstract

Abstract:

A fast frequency hopping scheme based on SDR was proposed to solve the problem that the existing fast frequency hopping communication system relied on satellite timing.Firstly, a true random sequence was used to perform frequency hopping operation on the modulated signal in this scheme.And the frequency hopping table was obtained by channel down-conversion, low-pass filtering and amplitude peak detection operations.Secondly, the receiver searched for the precise starting point by the peak-to-peak distribution characteristics of the quadrature demodulation amplitude of the baseband signal after de-hopping.Finally, down-conversion was performed and the peak-to-peak amplitude of the quadrature demodulation was checked for exceeding the threshold value to achieve de-hopping for frequency hopping signals.The effectiveness and adaptability of the proposed scheme is verified by using two general-purpose SDR devices with a hopping rate of four hops per symbol period in a real channel with other continuous signals.

Key words: frequency hopping communication, software defined radio, minimum frequency-shift keying, de-hopping

CLC Number:

TN914.41

Chengyu WEN, Conghui LIAO, Hang XIONG, Hong DU. Scheme and experiment of fast frequency hopping communication system based on SDR[J]. Journal on Communications, 2022, 43(8): 231-238.

Figures/Tables 10

References 14

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