Method for detecting perception radio collaboration frequency spectrum based on SNR compare

A technology of cognitive radio and cooperative spectrum, applied in wireless communication, electrical components, spectrum analysis/Fourier analysis, etc., can solve the problems of different SNR, low signal reliability, and the influence of sensor node reliability, so as to reduce the Number of nodes, improving performance, estimating easy-to-implement effects

Inactive Publication Date: 2009-05-20
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in the actual cognitive radio network environment, the local detection of sensing nodes is not always completely reliable. Since the sensing nodes are randomly distributed and the distances from the transmitter of the main user are different, the fading and shadow effects experienced by signal transmission are not the same, and ideal power control cannot be achieved in the initial stage of idle spectrum detection. These factors lead to different SNRs of signals received by each sensing node, which will affect the reliability of sensing nodes.
That is to say, those sensing nodes that have experience...

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  • Method for detecting perception radio collaboration frequency spectrum based on SNR compare
  • Method for detecting perception radio collaboration frequency spectrum based on SNR compare
  • Method for detecting perception radio collaboration frequency spectrum based on SNR compare

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Embodiment Construction

[0013] In the present invention, each sensing node in the sensing radio network is equipped with an SNR estimation function, so that the sensing node can estimate the SNR of the received signal. At present, there are many methods that can be used for SNR estimation, such as maximum likelihood estimation (ML), segmented signed moment estimation (SSME), second-order moment-fourth-order moment estimation (M2M4), minimum mean square error estimation (MMSE) and so on.

[0014] Figure 1 shows the process diagram of cooperative spectrum detection, in which N 0 is the fusion center with spectrum detection function, Ni(i=1, 2,...m) is m and N 0 Adjacent sensing nodes, y i Expressed in N i The primary user signal received at , u i is N i send to N 0 The local spectrum detection report of , the detection report includes the local spectrum detection result (indicated by 1 or 0, respectively representing the existence of the primary user signal and the absence of the primary user sign...

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Abstract

The invention applies for the protection of an SNR comparison-based algorithm for cooperative frequency spectrum sensing in cognitive radio and relates to a wireless communication system. The method comprises: SNR estimation technology is applied to cognitive radio; SNRs of signals received by sensing nodes are used as reliable references for the sensing nodes; the sensing nodes transmit local sensing results and estimated SNR values to a fusion center; and in the fusion center, the SNRs from the sensing nodes are compared and sensing nodes with good SNR are selected according to a selection algorithm provided by the invention for judgment and fusion. The algorithm of the can effectively improve frequency spectrum sensing performance and reduce the nodes for judgment and fusion.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to cognitive radio technology. Background technique [0002] To improve the detection performance of idle spectrum in Cognitive Radio (CR), a cooperative spectrum detection algorithm based on multi-user cooperation is proposed, which uses a distributed detection system to overcome severely attenuated received signal energy. In the cooperative spectrum detection method, there are many classic algorithms to fuse local judgments and obtain global judgments, such as K / N criterion and so on. However, these guidelines do not take into account the reliability differences of the local detection results of each node. Reference [Peng Qihang, Zeng Kun, Wang Jun, ″a Distributed SpectrumSensing Scheme based on Credibility and Evidence Theory in CognitiveRadio Context[C]″, IEEE 17th International Symposium on Personal, Indoorand Mobile Radio Communications, 2006, pp1-5] proposed A ...

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Application Information

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IPC IPC(8): H04W74/08G01R23/16
Inventor 谢显中郑轶
Owner CHONGQING UNIV OF POSTS & TELECOMM
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