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Novel double-threshold cooperative spectrum sensing algorithm based on energy detection

A technology for cooperative spectrum sensing and energy detection, applied in the field of spectrum sensing, can solve problems such as occupied channels and uncertainty of decision results, and achieve the effects of improving performance, improving the efficiency of cooperative spectrum sensing, and saving system overhead.

Inactive Publication Date: 2016-01-06
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of dual-threshold cooperative spectrum sensing algorithm based on energy detection. User spectrum detection has certain limitations, and there is a certain degree of uncertainty in the judgment results

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  • Novel double-threshold cooperative spectrum sensing algorithm based on energy detection
  • Novel double-threshold cooperative spectrum sensing algorithm based on energy detection
  • Novel double-threshold cooperative spectrum sensing algorithm based on energy detection

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specific Embodiment approach 1

[0034] Specific implementation mode one: combine figure 1 , figure 2 , image 3 As shown, its method steps are:

[0035] Step 1: Consider a central unit or base station and M cognitive users to participate in cooperative spectrum sensing; the central unit is responsible for managing the cognitive radio network and all M cooperative cognitive users; in this network, it is assumed that each cognitive user conducts local The sensing process is independent of each other, and is carried out by using a double-threshold energy spectrum sensing algorithm; the sensing situation of the i-th cooperative cognitive user, the detection model is expressed as follows:

[0036]

[0037] In the formula, s(n) is the input authorized user information, assuming that the obedience mean is zero and the variance is The normal distribution of w(n) is Gaussian white noise, which obeys the mean value of zero and the variance is The normal distribution of H 0 Indicates that there is only noise...

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Abstract

The invention provides a novel double-threshold cooperative spectrum sensing algorithm based on energy detection, and belongs to the technical field of spectrum sensing of a wireless system. The method comprises the steps that: 1, a center unit or base station and M cooperative cognitive users are considered to participate in cooperative spectrum sensing, and the center unit is responsible for managing a cognitive radio system and all of the M cooperative cognitive users; and 2, each cooperative cognitive user participating in cooperative spectrum sensing firstly checks the energy of authorized user signals received by itself and judges whether an energy statistical magnitude Ti is less than a threshold [lambda]0 or larger than or equal to a threshold [lambda]1, if the energy statistical magnitude Ti is less than the threshold [lambda]0, a sensed authorization channel is considered to be idle at present, and a value 0 is awarded to the sensed authorization channel, and if the energy statistical magnitude Ti is larger than or equal to the threshold [lambda]1, authorized users are using the current frequency range. According to the invention, a K-order fusion strategy and an EGC soft fusion strategy are effectively combined, the cooperative spectrum sensing efficiency is effectively improved, and the system cost is saved; in addition, compared with single-user self-adaptive double-threshold energy detection, the double-threshold cooperative spectrum sensing algorithm detection is based on multiple fusion rules.

Description

technical field [0001] The invention belongs to the technical field of spectrum sensing of wireless systems. Background technique [0002] Spectrum sensing is one of the most critical technologies for cognitive wireless systems. At present, various countries are conducting research. The main task of spectrum sensing is to quickly identify the channel occupancy status, determine which frequency bands are vacant frequency bands, and assign them to secondary users. communication. In an actual wireless communication network, there are often many cognitive users and authorized users. If the authorized user transmitter coverage radius is R, cognitive users 1, 2, and 3 are within this area, and cognitive user 4 is outside this area. When there is a huge obstacle between Cognitive User 1 and Cognitive User 3 and the transmitter of the authorized user, Cognitive User 1 and Cognitive User 3 will be in a disadvantageous position, and it is very likely that they will not be able to re...

Claims

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Application Information

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IPC IPC(8): H04B17/382
Inventor 江晓林苗雨谢玉鹏夏洪洋康辉
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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