Binary-Sequence Frequency Hopping Communication Method Based on Pseudo-Random Linear Frequency Modulation
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Binary-Sequence Frequency Hopping Communication Method Based on Pseudo-Random Linear Frequency Modulation TANG Zhiqiang 1∗ (),
QUAN Houde 1 (),
SUN Huixian 1,2 (),
CUI Peizhang 1 ()
(1. China Department of Electronic and Optical Engineering, the Army Engineering University of PLA, Shijiazhuang 050003, China; 2. National Key Laboratory of Science and Technology on Communication, University of Electronic Science and Technology of China, Chengdu 611731, China)
© Shanghai Jiao Tong University and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: To improve the signal detection performance of binary-sequence frequency hopping communication when the complementary channel is jammed, a binary-sequence frequency hopping communication system based on pseudo-random liner frequency modulation (LFM) is proposed. The transmitting end uses the chirp signal to carry out the in-band spread spectrum of the binary-sequence frequency hopping signal, and then sends it out through the radio frequency front end. At the receiving end, the received signal is dehopped and processed by fractional Fourier transform. The source information is obtained by sampling decision. Firstly, a binarysequence frequency hopping system model based on pseudo-random LFM is constructed. Secondly, the bit error rate expression of anti-partial band jamming and follower jamming under the Rice channel is derived. The results show that this method has at least 5 dB performance gain than binary sequence frequency hopping for different parameter settings under partial band jamming and follower jamming, and the anti-jamming performance is significantly better than the conventional frequency hopping communication. Key words: binary-sequence frequency hopping, liner frequency modulation (LFM), fractional fourier transform, partial band jamming, follower jamming CLC number: TN 914.4 Document code: A
0 Introduction Frequency hopping spread spectrum (FHSS) technology has been widely used in military communications because of its excellent anti-jamming ability and low probability of interception[1] . However, with the upgrading and replacement of the jamming system, the existing anti-jamming equipment faces severe challenges. Conventional frequency hopping technology relies on the hopping of carrier frequency to avoid partial band jamming (PBJ), but is vulnerable to the follower jamming (FJ)[2] . Although increasing the hopping rate can effectively suppress FJ, it is impossible to increase the hopping rate indefinitely due to the limitation of hardware[3]. Differential frequency hopping (DFH) technology has inherent FJ suppression capability, but it has shortcomings such as error code diffusion[4] . In addition, DFH generally adopts broadReceived: 2019-08-15 Accepted: 2019-11-15 Foundation item: the National Natural Science Foundation of China (Nos. 61531009 and 61471108), the National Major Project Foundation of China (No. 2016ZX03001009), and the Natural Science Foundation of Hebei Province (No. F2017506006) ∗E-mail: [email protected]
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