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Detecting method for energy detector based on weighting and combining of detection rate and false alarm rate

A detection method and false alarm rate technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as small threshold dynamic range, and achieve the effects of improved accuracy, low computational complexity, and simple system structure

Inactive Publication Date: 2011-08-10
NANTONG UNIVERSITY
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Problems solved by technology

[0006] The object of the present invention is to overcome the deficiency of its detection method of the above-mentioned existing energy detector and design a kind of detection method based on the detection rate and the false alarm rate weighted combination of the energy detector, to solve the judgment threshold dynamic range in the spectrum detection method is small to achieve fast, accurate and effective signal spectrum sensing and detection in the wireless environment

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  • Detecting method for energy detector based on weighting and combining of detection rate and false alarm rate
  • Detecting method for energy detector based on weighting and combining of detection rate and false alarm rate
  • Detecting method for energy detector based on weighting and combining of detection rate and false alarm rate

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Wireless spectrum signals that exist in the surrounding environment. Given two hypotheses: H 0 - There is only additive Gaussian noise n(t) in the surrounding environment; H 1 — There are allocated (licensed) wireless spectrum signals x(t) and additive Gaussian noise n(t) in the surrounding environment, namely

[0030] h 0 : y(t)=n(t)

[0031] h 1 : y(t)=x(t)+n(t)

[0032] Let the received signal be y(t), 0≤t≤T. Now estimate and detect whether there is a signal x(t) in the received signal y(t), the detection method of the implemented energy detector is as follows figure 1 The block diagram shown, the specific process is as follows:

[0033] First, according to the system’s detection rate P d and the false alarm rate P fa Set the appropriate detection rate weighting factor α and false alarm rate weighting factor β, and the value...

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Abstract

The invention relates to a detecting method for an energy detector based on weighting and combining of detection rate and false alarm rate. For the suppose H0 that a radio frequency spectrum signal x (t) exists and the suppose H1 that the radio frequency spectrum signal x (t) does not exist, whether the signal x (t) existing in a received signal y (t) or not is detected. The method comprises the steps as follows: 1, the weighting factors of the detection rate and the weighting factors of the false alarm rate are set; 2, weighting and combining are implemented on the detection rate Pd and the false alarm rate Pfa to form a target function P (gamma); 3, the P (gamma) is set as a target optimization function, and a decision threshold gamma for energy detection is obtained through the target optimization function; 4, the energy E of the signal y (t) received in a time which is equal to or more than 0, and is equal to or less than T is calculated by a squarer and an integrator; and 5, a decider decides according to the difference value of the decision threshold gamma and the energy E of the signal y (t) to judge whether the signal x (t) exists or not. The detecting method for the energy detector based on weighting and combining of detection rate and false alarm rate has the advantages that the detecting method can flexibly adjust the decision threshold of the energy detector according to different requirements of a system on the detection rate and the false alarm rate, has large dynamic scope on the decision threshold and has high signal sensing and detection accuracy, has simple system structure and short detection time, and is suitable for frequency spectrum detection of any signal.

Description

technical field [0001] The invention relates to wireless spectrum perception and detection technology in wireless communication, more specifically to a detection method of an energy detector based on the weighted combination of detection rate and false alarm rate in a wireless channel environment. Background technique [0002] At present, the contradiction between the ever-increasing spectrum demand and the limited spectrum resources is becoming more and more prominent, which seriously restricts the development of wireless communication services. However, from the perspective of actual wireless spectrum operation, the allocated (authorized) wireless spectrum is idle to a considerable extent in time and space. According to the measurement data report on the wireless spectrum, the spectrum utilization rate of most wireless frequency bands is only 10%. %about. How to effectively solve the contradiction between the scarcity of spectrum resources and the low utilization rate of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 张士兵包志华张昊晔
Owner NANTONG UNIVERSITY
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