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

Abstract

The invention discloses a system for quickly identifying and recognizing the state of a network channel and an identification method thereof; in a cognitive network, an orthogonal frequency division multiplexing (OFDM) mixed modulation signal transmission model is utilized to quickly and reliably distinguish four different states in the channel, the modulation methods of only one circuit or a plurality of circuits of sub-channels are changed, existing sending and receiving systems are not greatly changed, and the system is simpler. According to the invention, the four states in the channel are distinguished through the second-order cyclostationaity characteristic of a signal, and the cognitive network that a cognitive user belongs to is judged through calculating the identification number of the signal according to the cycle characteristic of the signal in the channel. According to the invention, the problem of quickly identifying the cognitive signal can be solved, and the communication safety of a main user and the smoothness of a cognitive network communication link are ensured.

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

Images