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Joint optimization method of detection period and detection time in cognitive radio system

A technology of cognitive radio and detection cycle, which is applied in the field of communication, can solve problems such as joint optimization of detection cycle and detection time that have not been discussed

Active Publication Date: 2012-03-28
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, there is no discussion on the joint optimization of detection cycle and detection time.

Method used

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  • Joint optimization method of detection period and detection time in cognitive radio system
  • Joint optimization method of detection period and detection time in cognitive radio system
  • Joint optimization method of detection period and detection time in cognitive radio system

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Embodiment Construction

[0032] 1. Detection cycle optimization

[0033] In order to improve spectrum utilization while reducing the PU i interference, the present invention maximizes the discovery of spectrum access opportunities (that is, the loss of spectrum access opportunities is minimized) while reducing the SU to PU i The disturbance is optimized for the target detection period T i . At the same time, the present invention assumes that the detection cycle optimization for all channels is asynchronous, that is, when the detection cycle of channel i is optimized, the detection cycles of other channels remain unchanged. Considering that the PU business satisfies the Poisson distribution, the ON / OFF cycle of channel i satisfies the exponential distribution, that is, the random variable F i / K i The probability density function of is expressed as follows:

[0034] f K i ...

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Abstract

Frequency spectrum detection is an important technology in cognitive radio. The invention aims at providing a joint optimization method of detection period and detection time in a cognitive radio system. The method comprises the following steps: based on improving a frequency spectrum utilization rate and reducing interference to an authorized user and aiming at maximumly discovering frequency spectrum access opportunity and reducing the interference of a secondary user (SU) to the authorized user, carrying out optimization to the detection period; then, under the restriction of object detection probability, optimizing the detection time aim at maximizing normalized throughput obtained by a SU detection channel; finally, based on the method of calculating the detection period and the detection time, carrying out combined iteration optimization to two parameters. By using the joint optimization method, the optimal detection period and detection time when the SU perceives the channel can be obtained so that the frequency spectrum access opportunity of the SU and the available normalized throughput of the SU detection channel can be substantially increased.

Description

technical field [0001] The invention relates to a method for joint optimization of a detection period and a detection time in a cognitive radio system, and belongs to the technical field of communication. Background technique [0002] A survey conducted by the US Federal Communications Commission (FCC) shows that 70% of the allocated spectrum is not fully utilized. In order to solve the problem of low spectrum utilization, cognitive radio technology (Cognitive Radio, CR) was born, through opportunistic spectrum sharing. way to share the spectrum. In a cognitive radio network (Cognitive Radio Network, CRN), the accurate and rapid detection of the surrounding wireless spectrum occupancy by the CRN is an important prerequisite and core link for improving spectrum utilization and protecting authorized users from interference. A vital technology in knowing radio. Some physical layer detection methods include energy detection method, matched filter detection method, feature dete...

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Application Information

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IPC IPC(8): H04B17/00H04B17/382H04W24/02
Inventor 朱琦叶军朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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