Dynamic grouping cooperation spectrum detection method based on bandwidth limitation

A technology of cooperative spectrum and detection method, which is applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of not considering the channel state conditions between group users, the system detection performance is difficult to achieve optimal, and the application is limited, so as to achieve The effect of practicality

Inactive Publication Date: 2013-07-31
SHANDONG UNIV
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Problems solved by technology

[0005]Most of the existing group-based cooperative spectrum detection methods are fixed-user grouping methods based on user distance. Such grouping methods do not consider the channel state conditions between group users , the detection performance of the system is difficult to achieve optimal
Zhang Wei proposed a cooperative spectrum detection technology based on STBC in the paper "Cooperative spectrum

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  • Dynamic grouping cooperation spectrum detection method based on bandwidth limitation
  • Dynamic grouping cooperation spectrum detection method based on bandwidth limitation
  • Dynamic grouping cooperation spectrum detection method based on bandwidth limitation

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Embodiment

[0046] Examples of the present invention figure 1 As shown, a cooperative spectrum detection method based on bandwidth-limited dynamic grouping is implemented by the following system, which includes authorized users 1, detection channel 2, cognitive users 3, inter-user channels 4, feedback channels 5 and base stations 6 , all users only need to configure a single antenna and have the ability to obtain channel information, authorize the transmitter of user 1 to broadcast signals to all cognitive users 3 through the wireless channel; first, cognitive users 3 are dynamically grouped according to the channel 4 information between users, The cognitive user 3 with the best feedback channel condition in each group is set as the cluster head; after the cognitive user 3 receives the signal from the authorized user 1, according to the comparison between the detected energy value and the set threshold, give The detection and judgment results are obtained, and the cognitive user 3 with hi...

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Abstract

The invention discloses a dynamic grouping cooperation spectrum detection method based on bandwidth limitation, belonging to the technical field of cognitive radio of wireless communication. A cognitive radio system comprises an authorized user, a detection channel, cognitive users, an inter-cognitive user channel, a feedback channel and a base station. The method comprises the following steps: firstly, the cognitive users are dynamically grouped according to the state information of the inter-user channel; two thresholds are set to only allow the cognitive user with high detection credibility to transmit a detection result to a cluster head; the cluster head transmits a fusion judgment result to the base station through a cooperative mode; and finally, the base station makes the final result decision. In the case of limited bandwidth, the method disclosed by the invention can remarkably reduce the information transmission overhead by losing some negligible system detection performance. At a grouping link, dynamic grouping can be realized by comparing the bit error rate of the channel during direct transmission by the cognitive user and during forwarding transmission of the detection result by the cluster head, and the system performance is obviously improved by the dynamic grouping in comparison with the grouping by a fixed user.

Description

technical field [0001] The invention relates to a cooperative spectrum detection method based on dynamic grouping with limited bandwidth, and belongs to the technical field of wireless communication cognitive radio. Background technique [0002] With the advancement of science and technology and the rapid development of wireless communication technology, wireless spectrum resources are becoming increasingly tight. Due to the fixed spectrum allocation policies of various countries, unlicensed spectrum resources are becoming less and less. With the rapid development of wireless communication services such as WLAN and WPAN, unlicensed frequency bands have gradually become saturated. At the same time, related studies have shown that the utilization rate of a large number of spectrum resources is very low. Therefore, a communication technology is urgently needed to solve the contradiction between the limited available spectrum resources and the low utilization rate of spectrum re...

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Application Information

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IPC IPC(8): H04B17/00H04B17/382
Inventor 白智全王兵许银龙董培浩
Owner SHANDONG UNIV
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