Improved double-threshold cooperative spectrum sensing method

A cooperative spectrum sensing and spectrum sensing technology, applied in the field of improved dual-threshold cooperative spectrum sensing, can solve the problem of low spectrum sensing performance

Active Publication Date: 2012-07-11
SUZHOU NEW DACHENG TECH DEV +1
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Problems solved by technology

[0010] Technical problem: The purpose of this invention is to propose an improved method for the traditional d

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  • Improved double-threshold cooperative spectrum sensing method
  • Improved double-threshold cooperative spectrum sensing method
  • Improved double-threshold cooperative spectrum sensing method

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Embodiment Construction

[0032] Assuming that there are a total of N cognitive users in a spectrum sensing system, they participate in the work of cooperative spectrum detection, combined with Figure 5 The perception process of the whole cognitive radio system is given as follows:

[0033] 1. Assuming that there are N cognitive users performing collaborative spectrum detection, each cognitive user first performs single-user spectrum sensing independently, and obtains a detection energy value of Y i , 1=1,...N, and the double threshold value of each user is λ 1 and lambda 2 . If the statistic Y of the i-th cognitive user i satisfies lambda 1 i 2 , then the cognitive user takes its perceived main user energy value Y i and the signal-to-noise ratio between the main user and the cognitive user are sent to the fusion center, otherwise, if the i-th cognitive user's statistic Y i meet Y i 1 or Y i >λ 2 , the cognitive user can judge the judgment result L by himself i , and put the hard decision re...

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Abstract

The invention relates to an improved double-threshold cooperative spectrum sensing method, which comprises the following steps that: a cognitive user in a cognitive radio system senses a local spectrum, compares and classifies sensed main user energy values, if the energy values are beyond two thresholds, can directly perform local judgment to obtain a hard judgment result whether a main user exists and send the result to a fusion center, if the energy values are between the two thresholds, the cognitive user needs to send the sensed main user energy values and signal to noise ratios to the fusion center, and the fusion center calculates a weight factor of each cognitive user according to the received signal to noise ratios and performs fusion judgment according to the received energy values to obtain a soft judgment result whether the main user exists; and the fusion center comprehensively processes the hard judgment result and the soft judgment result, and makes a final judgment whether the main user exists by using an 'or' rule. According to the method, the advantage of double-threshold cooperative spectrum sensing can be fully realized; and the spectrum sensing performance is improved.

Description

technical field [0001] The invention is an improved dual-threshold cooperative spectrum sensing method, which is mainly used to solve the problem of low sensing performance in a cognitive radio system, and belongs to the field of cognitive radio system sensing performance. Background technique [0002] With the expansion of broadband multimedia services, wireless spectrum resources are becoming more and more scarce, and the contradiction between supply and demand of spectrum is becoming more and more acute. However, wireless spectrum resources are non-renewable resources and can only be reused. Therefore, only by studying how to improve the utilization rate of spectrum can the problem of scarcity of spectrum resources be alleviated. In this background, cognitive radio technology came into being. The basic starting point of cognitive radio is that without affecting the normal communication in the authorized frequency band, wireless communication devices with cognitive functi...

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Application Information

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IPC IPC(8): H04B17/00H04W24/00H04B17/382
Inventor 张登银程春玲张慧华瑜敏
Owner SUZHOU NEW DACHENG TECH DEV
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