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Interference pattern recognition technology of frequency hopping system

An identification technology and system interference technology, applied in the field of frequency hopping system anti-interference technology, can solve problems such as difficult system compatibility, mutual interference between different systems, and high hardware system cost

Inactive Publication Date: 2010-01-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the increase of frequency hopping rate will increase the complexity of system modulation and demodulation, resulting in high hardware system cost and energy consumption; Mutual interference between systems; the improvement of the modulation method often requires re-development of the system, which is not easy to be compatible with the original system

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  • Interference pattern recognition technology of frequency hopping system
  • Interference pattern recognition technology of frequency hopping system
  • Interference pattern recognition technology of frequency hopping system

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Embodiment Construction

[0114] The method of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0115] Suppose the working frequency band of the frequency hopping system is 208MHz to 224MHz, the frequency hopping bandwidth is 16MHz, the frequency hopping rate is 12.5K / s, the number of frequency hopping is 32, the channel spacing is 0.5MHz, and the data modulation mode is 4FSK, and the information transmission rate is 50K / s, the information symbol is a random code stream. The center frequency of the interference is based on the center frequency of the frequency hopping communication signal, and is arbitrarily selected within the range of 6MHz for the left and right frequency deviations. The types of interference include narrowband monotone (CW) interference, noise amplitude modulation (AM) interference, and noise frequency modulation (FM) interference , ASK type keying interference, FSK type keying interference, PS...

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Abstract

The invention relates to an interference pattern recognition technology of a frequency hopping system, belonging to the field of broadband wireless communication. The technology is mainly used for analyzing various interference types of the frequency hopping system. On the premise of not increasing frequency hopping bandwidth and frequency hopping speed, the recognition for various interference patterns can be realized. First, pretreatment for removing frequency hopping points is carried out on the received signals; then, characteristic parameters such as time domain, frequency domain, time-frequency domain and the like of interference signals can be extracted for mode recognition, so that classified recognition of the different interference types can be realized. The technology has better recognition effect for the various common interference types as well as stronger robustness and stability, and provides reliable basis for further interference suppression. In addition, the method has low computational complexity and is easy to realize in real time by the system.

Description

technical field [0001] The invention relates to a frequency hopping system anti-interference technology, which belongs to the field of broadband wireless digital communication and is mainly used for analyzing various interference types of the frequency hopping system. Background technique [0002] The so-called frequency hopping (Frequency Hopping), that is, the carrier frequency of the traditional narrowband modulation signal is constantly hopping randomly under the control of the pseudo-random code, so as to realize the spread spectrum method of spectrum expansion. In 1963, the U.S. Navy first used frequency hopping technology in the BLADES system to combat hostile jamming. The frequency hopping system adopts the way of evasion to resist interference and has strong anti-interference ability; and because of the pseudo-randomness of the frequency hopping sequence, the frequency hopping signal is a signal with a low probability of interception and has certain confidentiality ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03H04B1/713H04B1/707
Inventor 陶然贾琳娜孟祥意黄克武
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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