Method for carrying out modulation recognition through distributed cooperation of multiple sensor nodes

Abstract

The invention provides a method for carrying out modulation recognition through distributed cooperation of multiple sensor nodes. Aiming at the defect that the modulation recognition rate of a single receiving node at low signal-to-noise ratio in a fading channel is low, according to the method provided by the invention, the distributed cooperation of multiple sensor nodes in a wireless sensor network is utilized to extract the characteristic parameter of a signal and recognize the modulation mode of the signal. The method comprises the following specific steps: firstly, utilizing multiple sensors which are mutually cooperative in the network to design an effective cooperation scheme according to the received signal-to-noise ratio size from the aspect of improving the network recognition performance and on the premise of minimal energy consumption of each sensor node, thus obtaining a new combination of characteristic parameters reflecting the significant difference of modulation types; and then utilizing an artificial neural network to recognize digital modulation signals and providing different cooperation schemes for different network conditions. Compared with single-node modulation recognition, the method for carrying out modulation recognition through the distributed cooperation of the multiple sensor nodes has higher recognition rate in the fading channel; and a node system is more flexible and more reliable.

Description

technical field [0001] The invention relates to a method for realizing automatic modulation recognition by distributed cooperation of multiple sensor nodes in a wireless sensor network, which belongs to the technical field of communication. Background technique [0002] With the development of communication technology, communication signals adopt different modulation methods in a wide frequency band, and the modulation parameters of these signals are also different. The automatic modulation recognition of digital signals can determine the modulation mode of the signal under the condition of various modulation signals and noise interference, which plays an important role in both civil and military fields. As the system and modulation styles of communication signals become more complex and diverse, the modulation identification of communication signals is particularly important and urgent. [0003] At present, the research methods of automatic recognition of modulation modes ...

AI Technical Summary

Problems solved by technology

[0005] At present, most modulation recognition research is limited to a single receiving node, and the received signal is processed centrally. Its recognition performance depends on the characteristics of the channel and the strength of the received signal. There are disadvantages of low recognition rate and unreliability when the signal-to-noise ratio is low.

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