Double-threshold energy sensing method and system based on adaptive detection length

Abstract

The invention discloses a double-threshold energy sensing method and system based on a self-adaptation detecting length. According to the method, the detecting performance of energy detection can be improved by increasing the detecting length in a self-adaptive mode, and meanwhile by integrating with a double-threshold detecting mechanism, the influence on energy detection due to uncertainty of noise is avoided. An upper judgment threshold and a lower judgment threshold are set according to the size of the uncertainty of the noise. When the detecting statistical magnitude is located outside the double thresholds, a judgment is directly carried out, or else the sampling number is increased, and the comparison is carried out once again until a judgment result is obtained or the sampling number reaches an upper limit. In order to reduce the increase in the system energy expenditure caused by the increase of the sampling number as mush as possible, the optimal sampling number upper limit which strikes a balance between the system energy expenditure and the handling capacity is provided by the double-threshold energy sensing method and system based on the self-adaptation detecting length. Under the condition that the energy expenditure is slightly increased, the detecting performance of the system is notably improved by the method.

Description

technical field [0001] The invention relates to a dual-threshold energy sensing method and system based on an adaptive detection length, and belongs to the technical field of wireless communication. Background technique [0002] With the rapid development of wireless communication technology, limited wireless spectrum resources have become one of the main factors restricting the development of communication technology. The traditional static spectrum allocation method divides available spectrum resources into multiple frequency bands fixedly and non-overlappingly, and only allows authorized users to access specific frequency bands. This allocation method is simple to implement, easy to manage, and can minimize interference between systems. However, according to research statistics, the spectrum utilization rate of most licensed frequency bands is low, and at the same time, a few licensed frequency bands are overloaded, such as mobile communication frequency bands. Spectrum...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a dual-threshold energy sensing method based on adaptive detection length for the superiority of overcoming noise uncertainty based on double thresholds and the inherent shortcomings of sensing failure, and the problem that the detection length has a greater impact on detection performance , the method first sets the upper and lower decision thresholds according to the noise uncertainty

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