System for quickly identifying and recognizing state of network channel and identification method thereof

Abstract

The invention discloses a system for quickly identifying the channel status of a cognitive network and an identification method thereof. In the cognitive network, the OFDM mixed modulation signal transmission model is used to quickly and reliably distinguish four different states in the channel. Only one channel or one channel is changed. The modulation method of multi-path sub-channels will not change the existing sending and receiving systems much, and the system is relatively simple; the present invention uses the second-order cyclostationary characteristics of the signal to distinguish four states in the channel, and can The cyclic characteristics of the signal are used to calculate the identification number of the signal, and then determine the cognitive network to which the cognitive user belongs. The invention can solve the problem of rapid identification of cognitive signals and ensure the security of primary user communication and the smoothness of cognitive network communication links.

Description

technical field [0001] The invention relates to a system and a method for identifying the state of a signal channel, in particular to a system for quickly identifying the state of a cognitive network channel and an identifying method thereof. Background technique [0002] Cognitive networks can provide dynamic spectrum access, make full use of spectrum resources, and manage spectrum effectively. Cognitive networks make full use of idle spectrum resources by adjusting the modulation parameters of their own signals, and use the authorized frequency band of the primary user for communication. Usually, in a cognitive network, a primary user and multiple cognitive users share a frequency band, and communication between network users is established through cognitive nodes of the network. Cognitive users use idle frequency bands to communicate and are affected by primary user communications. In the dynamic spectrum access of the primary user and the cognitive user, there are gene...

AI Technical Summary

Problems solved by technology

[0003] The traditional method is to achieve network coordination by specifying a shared control channel, but this method needs to occupy certain spectrum resources, and needs to negotiate with the primary user network for communication, which affects the transmission of the primary user

Another method is to increase the content of the signal header, but this method will increase the complexity of the communication equipment and reduce the transmission rate of information

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