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Differential jumping frequency G function construction method

A technology of differential frequency hopping and construction method, applied in the direction of electrical components, transmission systems, etc., can solve the problems of incomplete randomness, one-dimensional uniformity and two-dimensional continuity, insufficient performance, high system complexity, etc., to achieve Good anti-interception performance, simple structure, good anti-jamming effect

Inactive Publication Date: 2011-06-29
PLA UNIV OF SCI & TECH
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Problems solved by technology

[0005] The problem to be solved by the present invention is: the performance of the differential frequency hopping code sequence of the existing differential frequency hopping G function is not superior enough, and cannot fully satisfy the indicators such as randomness, one-dimensional uniformity and two-dimensional continuity, and the existing G function improved algorithm The original G-function algorithm structure has been changed, and the system complexity is very high, which is difficult to implement

Method used

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Embodiment 1

[0021] As shown in Fig. 2, the method of the present invention is realized by an FPGA chip and a DDS chip. The DDS chip is AD9854, the reference clock is 100 MHz, and the frequency control word is 48 bits to realize the function of a digital frequency combiner. Information sequence X n Enter the FPGA chip, the FPGA chip outputs a set of frequency control word K into the DDS chip AD9854, and the DDS chip outputs the differential frequency hopping signal f according to the input frequency control word K n ; The G function algorithm is a simple addition of the G function, and "The Performance Analysis of the Shortwave CHESS Frequency Hopping System" (Liu Zhongying, Journal of PLA University of Science and Technology (Natural Science Edition), October 2000) has an introduction to this function. The one-to-one mapping relationship between frequency and frequency hopping code sequence, the G function algorithm is A in the present embodiment n =G(X n , A n-1 ). Simple addition G ...

Embodiment 2

[0028] Refer to FIG. 5 for another practical example. Including FPGA chip and DDS chip, the DDS chip is AD9850, the reference clock is 10MHz, the frequency control word is 32 bits, and realizes the function of digital frequency combiner. Information sequence X n Enter the FPGA chip, the FPGA chip outputs a set of frequency control word K into the digital frequency combiner, and the digital frequency combiner outputs the differential frequency hopping signal f according to the input frequency control word K n . The G-function algorithm adopts the G-function with (6,1,5) systematic convolutional code structure ("Analysis of Equivalent Convolutional Codes for Differential Frequency Hopping", Yang Baofeng, Journal of Jilin University (Information Science Edition), October 2006) , G function algorithm with (6,1,5) systematic convolutional code structure, M sequence generator, register, modulo N addition, generation of 32bit frequency control word K, differential frequency hopping...

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Abstract

A constructing method of difference frequency hopping G function is provided. Data Xn transmitted presently and frequency of previous jump f[n-1] obtain frequency hopping code sequence An corresponding to frequency of present difference frequency hopping. Number of frequency of present difference frequency hopping is N. The frequency hopping code sequence generator generates pseudorandom frequency hopping code sequence Bn, processes module N pulse for An and Bn, and obtains new difference frequency hopping code Cn, outputs corresponding frequency control character K to control the digital frequency synthesizer to output final difference frequency hopping signal fn according to the Cn. The invention fully adopts present difference frequency hopping G function arithmetic and frequency hopping code sequence technology without altering structure of G function arithmetic; compared with the difference frequency hopping technology, only the frequency hopping code sequence generator and the module N pulse module are added with simple structure and easy implementation; finally output difference frequency hopping signal satisfies requirements of randomicity, one-dimension evenness and two-dimension continuity completely, which has greater anti-interruption and anti-capturing performances.

Description

technical field [0001] The invention belongs to the technical field of frequency hopping spread spectrum communication and relates to the generation of differential frequency hopping code sequences, in particular to a differential frequency hopping G function construction method with a simple structure. Background technique [0002] Spread spectrum communication is a commonly used technology in wireless communication systems, which is mainly used to counter or suppress the harmful effects of interference and to keep information confidential for other listeners. Frequency hopping spread spectrum communication is an important form of spread spectrum communication, especially widely used in military communication. Compared with fixed-frequency communication, the working frequency of frequency-hopping communication system is continuously hopping, so that multi-path interference and targeted interference can be effectively avoided, and its anti-intercept ability is also stronger ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/713H04B1/7136
Inventor 杨保峰沈越泓高媛媛李建东
Owner PLA UNIV OF SCI & TECH
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