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Difference frequency hopping communication method based on correlation capture of m sequence

A technology of differential frequency hopping and communication methods, applied in electrical components, transmission systems, etc., can solve problems such as easy interception and interference, poor communication security and quality, and high probability of false alarms, so as to improve anti-interference and anti-interception performance, improve the probability of synchronous acquisition, and overcome the effect of large changes in signal-to-noise ratio

Inactive Publication Date: 2011-02-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the disadvantages of the background technology, which is affected by the environment, the signal-to-noise ratio changes greatly, and it is easy to cause misjudgment, low probability of capture, high probability of false alarm, long capture time, low efficiency, easy interception and interference, and poor communication security and quality.

Method used

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  • Difference frequency hopping communication method based on correlation capture of m sequence
  • Difference frequency hopping communication method based on correlation capture of m sequence
  • Difference frequency hopping communication method based on correlation capture of m sequence

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Embodiment Construction

[0043] In this embodiment: the hopping speed is 5000 hops per second, the duration of each hop is 0.2 milliseconds, the number of hopping frequency points is 128, the interval between frequencies is 5 kHz, each hop carries 1 bit, and the length of each m-sequence is 127. According to this embodiment The capture performance index, the capture threshold is set to 100, which is 78.7% of the data length of an m-sequence. In this embodiment, three m-sequences are used to complete the capture. The first two m-sequences adopt the same design, which are:

[0044] {1 0 0 0 0 0 0 1 0 0 0 1 0 0 1 1 0 0 0 1 0

[0045] 1 1 1 0 1 0 1 1 0 1 1 0 0 0 0 0 1 1 0 0 1

[0046] 1 0 1 0 1 0 0 1 1 1 0 0 1 1 1 1 0 1 1 0 1

[0047] 0 0 0 0 1 0 1 0 1 0 1 1 1 1 1 0 1 0 0 1 0

[0048] 1 0 0 0 1 1 0 1 1 1 0 0 0 1 1 1 1 1 1 1 0

[0049] 0 0 0 1 1 1 0 1 1 1 1 0 0 1 0 1 1 0 0 1 0

[0050] 0}

[0051] The third m-sequence uses:

[0052] {1 0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 1 0 0 0 1

[0053] 0 1 0 1 0 1 1 1...

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Abstract

The invention relates to a difference frequency hopping communication method based on the correlation capture of an m sequence, belonging to the field of digital communication and comprising the following steps: setting m sequence data, deserializing, carrying out G functional mapping, generating a baseband frequency wave form, and carrying out intermediate frequency filtering and emission processing in the launch flow; receiving and processing signals, generating the baseband frequency wave form, carrying discrete acquisition, carrying out time / frequency signal transformation, decoding, carrying out correlation processing, judging capture, separating data, carrying out serial conversion processing, and outputting in the receiving flow. The invention has the characteristics of effective capture probability enhancement, false alarm rate reduction, capture time shortening, effective intercept resistance and anti-interference performance enhancement of a system and the like because the invention firstly transmits the m sequence data inserted with random numbers in a uniformly spaced mode and carrying out the G functional mapping processing of the m sequence data and serial Bit data on a transmitting terminal, and eliminates the random numbers through Viterbi decoding and carries out the correlation capture processing on the m sequence after time / frequency signal conversion on a receiving terminal.

Description

technical field [0001] The invention belongs to a digital communication method in the technical field of communication, in particular to a differential frequency hopping communication method captured by using m-sequence correlation. Background technique [0002] Differential Frequency Hopping (DFH) is a digital communication system, its frequency hopping speed is fast, communication confidentiality, anti-interference, and anti-interception are better, the receiver uses software radio to demodulate, and the receiving The effectiveness of terminal synchronization processing is the prerequisite for the normal operation of differential frequency hopping communication. The working principle (process) of the technology is as follows figure 1 As shown; its system includes a transmitter and a receiver, and the workflow is as follows: [0003] Step A: Send the input serial bit data stream into the serial-to-parallel conversion unit for serial-to-parallel conversion processing (1), ...

Claims

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Application Information

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IPC IPC(8): H04B1/713
Inventor 董彬虹董振奇程乙钊
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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