Double threshold collaborative spectrum sensing method based on differential energy detection
A technology of cooperative spectrum sensing and differential energy, applied in transmission monitoring, network planning, electrical components, etc., can solve problems such as sensing failure, and achieve the effect of simple implementation process
Active Publication Date: 2014-06-11
NANJING UNIV OF POSTS & TELECOMM
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[0006] The purpose of the present invention is to propose a dual-threshold collaborative detection method based on differential energy detection for the perception failure problem of traditional dual-threshold energy detection in the existing cognitive radio system
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[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, the signal received by the cognitive user is firstly filtered through a band-pass filter, and then the output of the band-pass filter is squared, and the signal is integrated within a fixed period to obtain the energy of the signal Statistical value. Finally, compare the energy statistical value with a preset energy threshold value. If it is greater than the threshold value, it indicates that the primary user is occupying the authorized channel, otherwise it indicates that the primary user is not occupying the authorized channel.
[0021] Such as figure 2 As shown, each cognitive user first uses the dual-threshold detection method based on differential energy detection to make a local judgment, and then sends the local judgment result to the system fusion center, and uses the "OR" criterion to obtain the overall judgment re...
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The invention discloses a double threshold collaborative spectrum sensing method based on differential energy detection. The method solves the problems that in the energy detecting process, energy thresholds are prone to being influenced by uncertainty of noise, and sensing failure exists in a traditional double threshold method. According to the method, each cognitive user is locally sensed, on the basis of traditional double threshold energy detection, energy values between the double thresholds are subjected to differential energy detection, and energy values beyond the double thresholds are subjected to traditional energy detection; then, the local judgment result of each cognitive user is sent to a system fusion center, and the total judgment result of a system is obtained through the 'OR' fusion rule. According to the method, the advantages that both the deferential detection and the double threshold detection can overcome the influences caused by uncertainty of noise are combined, and the cognitive wireless spectrum sensing property based on energy detection is further improved.
Description
technical field [0001] The invention relates to the technical field of computer wireless communication, in particular to a dual-threshold cooperative spectrum sensing method based on differential energy detection. Background technique [0002] With the rapid development of computer radio technology in my country, wireless spectrum resources are increasingly scarce, and the existing static spectrum allocation method based on authorization cannot well adapt to the development requirements of the times. According to survey statistics, it is found that most of the licensed frequency bands are currently idle most of the time, and the utilization rate is very low. At the same time, some unlicensed frequency bands are crowded with competing uses (such as bands for mobile phone communications). In this case, how to effectively improve the spectrum utilization of cognitive radio technology has become a current research hotspot. [0003] The two most important goals of cognitive rad...
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IPC IPC(8): H04W16/14H04W24/00H04B17/00H04B17/382
Inventor 张学军严金童鲁友田峰成谢锋
Owner NANJING UNIV OF POSTS & TELECOMM