Channel frequency spectrum sensing method based on grouped data type sequential energy detection

A technology of sequential energy detection and grouping of data, applied in the field of channel spectrum sensing, can solve the problems of not fully considering the time correlation of sensing information and the large amount of calculation.

Inactive Publication Date: 2015-01-07
NANJING UNIV OF TECH
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Problems solved by technology

[0005] To sum up, in the CR system, the main user is required not to change the state frequently, and the likelihood judgment method of point-by-point comparison between SD and SED does not fully consider the temporal correlation of perceptual information, and the amount of calculation is large

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  • Channel frequency spectrum sensing method based on grouped data type sequential energy detection
  • Channel frequency spectrum sensing method based on grouped data type sequential energy detection
  • Channel frequency spectrum sensing method based on grouped data type sequential energy detection

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Embodiment Construction

[0047] like figure 1 As shown, when using the existing energy detection (Energy Detection, ED)-based, the available channels of the secondary user depend on the channel usage of the primary user. If the activity of the primary user is modeled as an "ON-OFF" model, the available channels are The main user occupies the channel "ON" and does not occupy the channel "OFF" alternately. In order to realize dynamic spectrum access and protect the primary user, the secondary user periodically detects the primary user signal to determine whether the primary user exists in the frequency band. figure 1 Medium sensing period T sp Contains the sensing time T st and transmission time T tt , and the channel detection time T cdt contains N T sp (T sp ≤T cdt ). Secondary users sense available channels before transmission, facilitating communication between secondary users. When the primary user is in the "ON" state, the secondary user needs to avoid and re-perceive the available channe...

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Abstract

The invention provides a channel frequency spectrum sensing method based on grouped data type sequential energy detection. The channel frequency spectrum sensing method comprises the following steps: periodically sampling channels in channel detection time by a sensing period, grouping sensing signals in sensing time within the sensing period, and combining all groups to obtain supersampling; calculating the log-likelihood ratio of a supersampling sequence; setting the judgment criterion of detection statistic volume according to a sequential detection process; repeatedly executing the step on sensing signals in sensing time within next sensing period until the occupying condition of the channel is obtained in the channel detection time. The channel frequency spectrum sensing method prolongs data transmission time, improves handling capability, simplifies log-likelihood ratio calculating process, reduces the calculation burden of secondary users, reduces the influence of short-term channel randomness and improves the channel frequency spectrum sensing efficiency, thereby indirectly improving the handling capability.

Description

technical field [0001] The present invention relates to a channel spectrum sensing method, in particular to a channel spectrum sensing method based on packet data type sequential energy detection. Background technique [0002] Cognitive Radio (CR) is an intelligent communication technology that can improve the utilization of wireless spectrum resources. In the case of ensuring that the primary user is not interfered, the secondary user discovers the spectrum hole of the primary user through sensing technology, selects the best available channel for access, and improves spectrum utilization. Spectrum sensing technology is the basis and premise of realizing CR. Energy Detection (ED), which is simple and easy to implement and does not require any prior knowledge, is widely used in spectrum sensing. However, cognitive networks usually perform spectrum detection under low signal-to-noise ratio. If the energy detector still needs to achieve good detection performance, the requir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
Inventor 王天荆刘国庆刘浩
Owner NANJING UNIV OF TECH
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