Method and device for radio signal recognition

A radio signal and signal technology, applied in the field of communication, can solve the problems of OFDM signal detection performance degradation, etc.

Active Publication Date: 2013-03-27
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0009] In order to overcome the decline in the detection performance of the energy detection method for OFDM signals when the noise has a large uncertainty and the SNR is relatively low, the embodiment of the present invention provides a radio signal recognition method and device

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  • Method and device for radio signal recognition
  • Method and device for radio signal recognition
  • Method and device for radio signal recognition

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Embodiment Construction

[0036] The radio signal recognition method and equipment provided by the embodiments of the present invention detect the basic user signals in the form of OFDM in the communication system, and all OFDM signals in the time domain are described by taking their equivalent baseband signal form as an example.

[0037] In the embodiment of the present invention, the radio signal to be recognized is specifically a cognitive user signal. In the embodiment of the present invention, the cognitive user signal is first sampled, and after the digital signal of the cognitive user signal is obtained, the autocorrelation function is calculated on the digital signal, the judgment amount is calculated by the autocorrelation function, and the recognition amount is determined according to the judgment amount. Whether there is a basic user signal in the user signal.

[0038] In the embodiment of the present invention, the OFDM signal sent by the basic user is marked as x(t), the signal received by...

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Abstract

The invention discloses a method and a device for radio signal recognition, and belongs to the field of communication. The method comprises the following steps: sampling a radio signal to be recognized to obtain a digital signal of the radio signal to be recognized; performing calculation of a self correlation function on the digital signal to obtain the self correlation function of the digital signal; calculating a decision quantity according to the self correlation function of the digital signal; and determining whether a basic user signal exists in the radio signal to be recognized according to the decision quantity. The device comprises a sampling module, a first computing module, a second computing module and a determining module. The decision quantity is obtained according to the self correlation function of the digital signal to be recognized, and the existence of the basic user information is determined according to the decision quantity, so the method overcomes the defect that the detection performance of an energy detection method on OFDM signals is reduced under the conditions that noise has high uncertainty and SNR is low.

Description

technical field [0001] The invention relates to the field of communication, in particular to a radio signal recognition method and equipment. Background technique [0002] The spectrum resources of the modern wireless communication system are allocated by the radio management organization as a whole, and the principle and scheme of static allocation are currently adopted. However, with the increasing number of wireless communication systems, even if each communication system improves its own spectrum utilization, the limited spectrum resources are increasingly unable to meet the growing user needs. One of the main reasons is the static allocation of spectrum resources. From the dual perspectives of time domain and air domain, there are still many blank frequency bands that are not fully utilized. In order to solve the shortage of spectrum resources, realize dynamic spectrum management and improve spectrum utilization, a Cognitive Radio (CR, Cognitive Radio) technology is pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04B1/719H04B17/382
Inventor 徐平平许恒锦张建伟
Owner HUAWEI TECH CO LTD
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