Segmented energy processing-based truncated sequential test method

An inspection method and energy processing technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as poor detection performance, high computational complexity, shortened sensing time, etc., achieve effective sensing, shorten spectrum sensing time, simplify Effects of calculation and theoretical derivation process
CN102075263AInactive Publication Date: 2011-05-25XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2011-05-25
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a segmented energy processing-based truncated sequential test method, which mainly solves the problem that the conventional spectrum sensing algorithm has poor detection performance and high computational complexity in a complex electromagnetic environment. The method comprises the following steps of: (1) sampling a received signal; (2) averagely segmenting the sequence ofthe sampled received signal, and calculating energy of each segmented sequence; (3) calculating the maximum likelihood ratio lambda j of the energy of each segmented sequence; (4) calculating test statistics Lambda K of the likelihood ratio lambda j of the energy of each segmented sequence; (5) determining an upper limit and a lower limit of a decision threshold; (6) determining the optimal truncated threshold; and (7) comparing and deciding the test statistics Lambda K, the upper and lower limits of the decision threshold and the optimal truncated threshold to obtain an output result. The method has the advantages of low computational complexity and short spectrum detection time, and can be used for improving the spectrum sensing performance of a cognitive radio network in the complex electromagnetic environment.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication, relates to cognitive radio technology, is a spectrum sensing method, and is suitable for wireless communication channels with high complexity, low signal-to-noise ratio and high dynamic characteristics. Background technique

[0002] With the rapid development of wireless and mobile communications, the contradiction between the increasing demand for wireless spectrum and limited spectrum resources has become a prominent contradiction in the current wireless communication industry. Nevertheless, the US Federal Communications Commission FCC's spectrum strategy task work report shows that most of the spectrum is idle most of the time, the spectrum utilization rate of the 0-3GHz band is 30%, and the spectrum utilization rate of the 3-4GHz and 4-5GHz bands is 30%. The rate is only 0.5% and 0.3%. In order to improve the current situation of low spectrum utilization, J.Mitola et al. propo...

Claims

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