Variable-Speed Frequency-Hopping Signal Sorting: Spectrogram Is Sufficient

Author:

Zhu Weipeng1,Jin Hu1,Wang Jin1,Lei Yingke1,Lou Caiyi2,Liu Changming3

Affiliation:

1. College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China

2. Jiaxing Communication Information Security Control Laboratory Technology Research Institute, The 36th Research Institute of China Electronics Technology Group Corporation, Jiaxing 314033, China

3. Tong Fang Electronic Science Technology Co., Ltd., Jiujiang 332005, China

Abstract

In this paper, we present a novel signal sorting method aimed at reducing the impact of interference and noise while achieving blind detection and accurate sorting of a variable-speed frequency-hopping communication system. To achieve this, we combine spectrogram analysis with an innovative sorting approach. First, we generate the spectrogram of the received signal, and then employ a morphology filter to effectively eliminate noise and sweep frequency interference from the spectrogram. Subsequently, we identify and mark connected domains in the spectrogram, from which we extract the duration data to create a dataset specifically for separating fixed-frequency interference. Furthermore, we propose a specialized time alignment algorithm designed to accommodate the unique characteristics of variable-speed frequency-hopping signals, enabling precise sorting of variable-speed frequency-hopping signals. Through rigorous comparative evaluations against existing algorithms, we demonstrate that our proposed approach provides superior accuracy by offering a clearer representation of the time–frequency situation of the received signals. The proposed method provides a high correct sorting probability which is equal to 0.8 when signal-to-noise ratio is 0 dB and reaches 1 when signal-to-noise ratio reaches over 12 dB. In comparison, the correct sorting probability of the comparison algorithm is far inferior to the proposed algorithm.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

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