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Signal identification method and system based on constellation graph reconstruction by clustering and particle swarm

A technology of signal recognition and particle swarm algorithm, which is applied in the field of signal recognition method and system based on clustering and particle swarm reconstruction constellation diagram, can solve the problems of low recognition rate and disadvantages, and achieve high signal recognition rate and anti-interference ability strong effect

Inactive Publication Date: 2016-12-21
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing MQAM signal recognition method has a low recognition rate and is not conducive to practical problems. A signal recognition method and system based on clustering and particle swarm reconstruction constellation diagram is provided

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  • Signal identification method and system based on constellation graph reconstruction by clustering and particle swarm
  • Signal identification method and system based on constellation graph reconstruction by clustering and particle swarm
  • Signal identification method and system based on constellation graph reconstruction by clustering and particle swarm

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Embodiment Construction

[0045] A signal recognition method based on clustering and particle swarm reconstruction constellation diagram, such as figure 1 shown, including the following steps:

[0046] (1) Estimate the carrier frequency of the signal received by the radio frequency antenna.

[0047] (2) Down-convert the signal after the carrier frequency is estimated to obtain a complex baseband signal.

[0048] (3) The dual analog-to-digital converter (AD) samples the complex baseband signal, and the baseband signal data set is (x 1 ,x 2 ,...,x n )

[0049] (4) Send the sampled data set to the baseband signal processing module, and process it through the signal recognition algorithm. The specific algorithm flow chart is as follows figure 2 As shown, the specific steps are:

[0050] (4.1) Initialize the neighborhood radius ra =0.8, set the upper threshold lower threshold ε = 0.32.

[0051] (4.2) The collected data set (x 1 ,x 2 ,...,x n ) for subtractive clustering, each data point is a...

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Abstract

The invention discloses a signal identification method and system based on constellation graph reconstruction by clustering and a particle swarm. A data point of collected data is obtained by using a subtraction clustering algorithm; a clustering center is optimized by using a particle swarm algorithm; and then a reconstructed constellation graph is obtained. Distances between all constellation data points and original data points are calculated; all constellation data points are divided to circles with different radiuses; and a ratio of a largest radius to a smallest radius is compared with a characteristic range of a standard constellation graph circle radius to identify an MQAM signal. Compared with the traditional subtraction clustering algorithm, the anti-interference capability is high; the signal identification rate is high on the condition of the low signal to noise ratio; and the method and system can be applied to the practice well.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a signal recognition method and system for reconstructing a constellation diagram based on clustering and particle swarms. Background technique [0002] Communication signal modulation recognition technology is widely used in both military and civilian communications. In terms of civil use, in order to implement effective spectrum management and spectrum supervision, the government needs to monitor unregistered civil transmitters in real time to avoid interference with authorized user communications. In terms of military use, modulation recognition technology plays a key role in electronic countermeasures, electronic countermeasures, target acquisition, and communication alarms. By modulating and identifying the receiver, intercepting the other party's communication signal, identifying its modulation mode, and then further demodulating and analyzing the information to obt...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
CPCG06F2218/12G06F18/23211G06F18/24
Inventor 肖海林黄国庆颜晓娟王茹莫秋椿闫坤
Owner GUILIN UNIV OF ELECTRONIC TECH
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