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Compressed sensing-based broadband spectrum sensing method

A broadband spectrum and compressed sensing technology, applied in the field of communication, can solve problems such as high computational complexity and poor real-time performance, and achieve the effect of reducing the amount of calculation, reducing requirements, and reducing computational complexity

Inactive Publication Date: 2011-12-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0013] Technical problem: The purpose of the present invention is to provide a wideband spectrum sensing method based on differential signal compressive sensing in a cognitive radio system. The method uses energy detection as a basic model and introduces compressive sensing theory to reduce the requirements for analog / digital converters. , in order to solve the problem of high computational complexity and poor real-time performance in the signal reconstruction process, the detection difference signal is used instead of the signal itself as the basis for spectrum judgment

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Embodiment Construction

[0033] Assume that the mixed time-domain signal received by the secondary user can be expressed as:

[0034] x = Σ i = 1 K α i h i x i - - - ( 1 )

[0035] where α i Indicates the signal x i Possible signal loss during transmission, h i Indicates the signal x i The filtering process through a bandpass filter.

[0036]Since existing wireless communication systems all adopt low-efficiency fixed channel allocation strategies, the signal in formula (1) is sparse in spectrum, which can be written as:

[0037] x=Ψθ (2)

[0038] Where Ψ is θ is the parameter vector of signal x projected on Ψ, if there are only K non-zero coefficients in θ or all other coefficients are extremely sma...

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Abstract

The purpose of the present invention is to provide a broadband spectrum sensing method based on differential signal compressed sensing in a cognitive radio system. The method takes energy detection as a basic model and introduces compressed sensing theory to reduce the requirements for analog / digital converters; For the problem of high computational complexity and poor real-time performance in the signal reconstruction process, the detection difference signal is used instead of the signal itself as the basis for spectrum judgment, and accuracy is introduced as the iteration stop condition of the algorithm. The accuracy of the algorithm can be flexibly adjusted according to needs, and the computational complexity can be reduced. The secondary user periodically collects information at a low sampling rate, and retains the information of spectrum detection at time t, which can be used as prior knowledge for detection at time t+1, and the difference signal at two times is used as the input of the reconstruction algorithm , quickly restore the signal characteristics and perform segmental energy detection to obtain the current idle spectrum information of the primary user spectrum, so as to achieve the purpose of real-time low-power broadband spectrum sensing.

Description

technical field [0001] The invention relates to a broadband spectrum sensing method based on differential signal compression sensing in a cognitive radio system, which belongs to the technical field of communication. Background technique [0002] With the extensive development of wireless communication services, spectrum resources are increasingly scarce. The main reason is that the wireless spectrum access technology is unreasonable—existing wireless communication systems all use low-efficiency fixed channel allocation strategies. Cognitive radio is considered to be one of the most effective new technologies to solve this problem. It allows cognitive users to share the frequency band without affecting the normal communication of legitimate users in the frequency band. [0003] Spectrum sensing technology is an important basic link in the design of cognitive wireless networks. Only by knowing the spectrum usage of primary users in real time and quickly can the secondary use ...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 朱琦王璐瑜朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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