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Joint spectrum detection method based on energy-cyclostationary characteristic

A technology of cyclostationary features and detection methods, which is applied in the field of communication, can solve problems such as occupying a large communication bandwidth, achieve the effects of reducing complexity, improving detection probability, and being widely used

Inactive Publication Date: 2010-09-15
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Cooperative sensing requires multiple cognitive users to cooperate with each other to overcome the hidden node problem and the influence of deep fading in the wireless channel, and improve the cognitive performance of cognitive radio, but when a large number of cognitive users coexist in the network, they need Occupies a large amount of communication bandwidth to transmit detection information

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Embodiment Construction

[0021] The energy detection method is a relatively simple signal detection method, which belongs to the non-coherent detection of signals. Its performance will be affected by the energy of uncertain noise. or burst interference is detected as a signal. Moreover, energy detection cannot distinguish signal types, but can only determine the existence of signals. Therefore, energy detection is not suitable for detecting signals in unexpected situations.

[0022] The biggest advantage of cyclostationary characteristic detection is that it can distinguish noise energy from modulation signal energy. This is because the noise is a broad stationary signal without correlation, while the modulated signal exhibits cyclostationarity due to the self-redundancy of the signal period. Cyclostationary characteristic detection is not easily affected by uncertain noise power, so its detection performance is better than energy detection in noisy environments, but its calculation is more complica...

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Abstract

The invention relates to a joint spectrum detection method based on energy-cyclostationary characteristic for improving the detection probability and reducing the complexity as soon as possible at the same time. The invention utilizes the characteristics of energy detection and cyclostationary characteristic detection, and realizes spectrum joint detection in cognitive radio systems by utilizing two thresholds. In the invention, an energy detection method of the two thresholds is utilized for crude detection, if the energy is at both ends of the two thresholds, the energy of a signal to be detected is calculated, the energy obtained from the calculation is compared with the two predetermined thresholds, if the energy is no less than the high threshold, a primary user signal is determined to exist; if the energy is no more than the low threshold, the primary user signal is determined to not exist; and if the energy is between the two thresholds, the cyclostationary characteristic is utilized for detection, and the value of a specific cycle frequency is calculated and is compared with the cycle detection threshold, if the value is no less than the threshold, the primary user signal is determined to exist, and the primary user signal is determined to not exist if the value is no more than the threshold.

Description

technical field [0001] The invention relates to an implementation scheme for joint spectrum detection based on energy-cycling stationary features in a cognitive radio system, which belongs to the technical field of communication. Background technique [0002] With the rapid growth of demand for wireless communication services, available spectrum resources are becoming increasingly scarce. In order to improve the spectrum utilization efficiency of the communication system, in response to the fixed spectrum allocation policy that is uniformly managed and authorized by the state, and alleviate the situation of "increasingly tight spectrum resources". Cognitive Radio (CR) has attracted widespread attention once it was proposed by Mitola. CR means that when licensed users do not use the licensed frequency band, CR users can "insert" the frequency band for communication, which can greatly improve spectrum utilization. Rate. Of course, the premise of using it is not to interfere ...

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Application Information

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IPC IPC(8): H04B1/707H04B17/00H04W24/00H04B17/382
Inventor 朱琦刘小莉卞荔赵夙
Owner NANJING UNIV OF POSTS & TELECOMM
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