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Blind frequency hopping pattern FHSS signal frequency hopping removing method

A frequency hopping pattern and signal technology, applied in advanced technology, climate sustainability, sustainable communication technology, etc., can solve the problem of inability to achieve frequency hopping, and achieve the effect of tolerance to time and clock drift

Active Publication Date: 2022-07-08
CHENGDU UNIV OF INFORMATION TECH
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AI Technical Summary

Problems solved by technology

Relatively speaking, the data samples needed to detect parameters such as the frequency set used by the blind frequency hopping pattern FHSS signal, the frequency switching period, and the signal duration in each frequency switching period are relatively small, which is easy to implement in engineering. The method relies on these parameters and cannot achieve frequency hopping

Method used

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  • Blind frequency hopping pattern FHSS signal frequency hopping removing method

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Embodiment Construction

[0035] The embodiments of the method of the present invention will be described in detail below with reference to the examples.

[0036] In an embodiment, the working process of the frequency hopping signal transmitter:

[0037] 1) 16kbps digital signal source sends bit stream,

[0038] 2) After performing GSMK modulation with 1024 samples / symbol to obtain a modulated signal with a sampling rate of 16384ksps,

[0039] 3) Switch the period P at the frequency H =256 sampling points, perform frequency hopping operation on N=16 true random channels, and send them to the air through SDR equipment;

[0040] In an embodiment, the frequency hopping signal receiving end uses the SDR equipment to receive the air frequency hopping signal, the SDR equipment uses an internal clock, and the receiving end operating parameters are set:

[0041] 1) Known the number of frequency hopping channels N=16 and the frequency hopping frequency set f 0 ~f N-1 , the number of sampling points P corre...

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Abstract

The invention discloses a blind frequency hopping pattern FHSS signal frequency hopping removing method, which takes a frequency hopping signal frequency set, a frequency hopping period and a sampling number sent by the frequency hopping period as known conditions, searches a frequency hopping table consisting of amplitude data peak subscripts and frequency hopping frequency two-tuple nodes after channel frequency hopping removing filtering, automatically searches a frequency switching point, and finally performs frequency hopping removing. In the frequency hopping removing process, the frequency switching point drift is automatically corrected based on the quadrature demodulation amplitude peak-to-peak value after low-pass filtering.

Description

technical field [0001] The invention belongs to the field of radio communication, and in particular relates to a blind frequency hopping pattern FHSS signal de-frequency hopping technology. Background technique [0002] The receiving end of an FHSS (Frequency Hopping Spread Spectrum) communication system involves two main processes: de-hopping and demodulation. The function of de-frequency modulation is to move the signal fragments appearing in each frequency hopping channel time slice from the channel frequency to 0 IF, and assemble into a complete 0 IF baseband signal; after the frequency hopping signal is converted into a 0 IF baseband signal through de-frequency modulation, the principle In the above, the demodulation method is not fundamentally different from the non-spread spectrum communication system. [0003] At present, the FHSS receiver is mainly composed of basic modules such as frequency hopping pattern generator, NCO (numerically controlled oscillator), mixer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713
CPCH04B1/713Y02D30/70
Inventor 文成玉廖聪慧熊航杜鸿
Owner CHENGDU UNIV OF INFORMATION TECH
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