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A Cooperative Spectrum Sensing Threshold Optimization Method in Cognitive Wireless Networks

A collaborative spectrum sensing and cognitive wireless network technology, applied in the field of assisting spectrum sensing threshold optimization, can solve problems affecting the performance of sensing, improve performance, improve detection performance, and reduce the probability of false detection

Active Publication Date: 2016-03-02
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Secondly, when using the dual-threshold energy detection method for spectrum sensing, the selection of the detection threshold greatly affects the sensing performance

Method used

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  • A Cooperative Spectrum Sensing Threshold Optimization Method in Cognitive Wireless Networks
  • A Cooperative Spectrum Sensing Threshold Optimization Method in Cognitive Wireless Networks
  • A Cooperative Spectrum Sensing Threshold Optimization Method in Cognitive Wireless Networks

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Embodiment Construction

[0019] According to the definition of the correlation probability of single-threshold energy detection, the correlation probability of double-threshold energy detection is defined as follows:

[0020] p f = P ( E ( x ) > λ 1 | H 0 ) = Q ( ( λ 1 σ u 2 - 1 ) τf s ) - - - ( 1 )

[0021] ...

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Abstract

The invention provides a cooperative spectrum sensing threshold optimization method in a cognitive wireless network. According to the method, a voting threshold and a detection threshold in dual-threshold cognitive spectrum sensing based on voting fusion are optimized respectively. The method comprises the steps of firstly, fixing a detection threshold value of dual-threshold energy detection, optimizing the voting threshold of voting fusion rules, and enabling the global error probability of the cooperative spectrum sensing under the condition of the energy detection threshold value to be the minimum; then, on the premise that the voting threshold of the voting fusion rules is the optimal value, optimizing the detection threshold value of the dual-threshold energy detection, and enabling the optimal detection threshold value to be dynamic under the condition of different receiving signal-to-noise ratios, and therefore the optimal detection threshold value is determined according the signal-to-noise ratio. According to the cooperative spectrum sensing threshold optimization method, the global error probability of the cooperative spectrum sensing under the condition of each signal-to-noise is made to be the minimum, and therefore the performance of the cooperative spectrum sensing is improved.

Description

technical field [0001] The invention relates to a method for assisting spectrum sensing threshold optimization in a cognitive wireless network, and belongs to the technical field of communications. Background technique [0002] With the continuous development of wireless communication technology, such as Bluetooth, Wifi, WSN, 3GLTE, etc., more and more communication systems need to allocate wireless spectrum. The characteristics of non-line-of-sight propagation of radio waves determine that wireless devices are suitable for use in frequency bands below 3GHZ However, the traditional fixed allocation spectrum mechanism ensures that each communication system occupies a certain frequency band, resulting in few frequency bands below 3GHZ available for allocation so far. At the same time, the use efficiency of licensed spectrum is very low, only 15% to 85%. Cognitive radio can effectively solve the spectrum scarcity by allowing secondary users to transmit data in idle licensed fr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382H04W24/02
CPCY02D30/70
Inventor 朱琦金燕君
Owner NANJING UNIV OF POSTS & TELECOMM
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