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Effective-capacity-based resource allocation method in cognitive radio system

A cognitive radio and effective capacity technology, applied in the field of wireless communication, can solve problems such as not considering delay QoS requirements, only considering very strict and very loose QoS requirements, etc.

Active Publication Date: 2014-08-20
永春县产品质量检验所福建省香产品质量检验中心国家燃香类产品质量监督检验中心福建
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AI Technical Summary

Problems solved by technology

[0005] Most resource allocation algorithms in existing wireless communication systems do not consider delay QoS requirements or only consider very strict and very loose QoS requirements

Method used

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  • Effective-capacity-based resource allocation method in cognitive radio system
  • Effective-capacity-based resource allocation method in cognitive radio system
  • Effective-capacity-based resource allocation method in cognitive radio system

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0052] The optimized power allocation scheme based on effective capacity proposed by the present invention is as follows:

[0053] Consider a cognitive radio system, which contains a cognitive user, two sub-channels, sub-channel A and sub-channel B, and the channel model is Rayleigh fading channel and block fading. The frame structure of the cognitive radio system is as follows: figure 1 As shown, where T represents the duration of a frame, that is, the frame length, N represents the duration of channel sensing by cognitive users in each frame, and the first N long-term cognitive users in each frame perform channel sensing.

[0054] Step 1: The two sub-channels perform channel sensing independently without interfering with each other. The first N long-term cognitive users of each frame perform channel sensing to determine whether authorized users occ...

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Abstract

The invention provides an effective-capacity-based resource allocation method in a cognitive radio system. The method includes the following steps: a cognitive user in the cognitive radio system perceives a channel and a transmission scheme of the cognitive user is determined according to the perception result; according to the transmission scheme, an effective capacity in the cognitive radio system is obtained and under a condition that an average power is limited, the effective capacity is optimized; and through application of a gradient descent method, a dual problem of an optimization problem is solved so that an optimal power allocation strategy is obtained. Compared with a traditional equipower scheme, the effective-capacity-based resource allocation method enables the performance of the system to be improved and the QoS guaranteeing capability of the system to be improved; and under a multi-channel scenery, the method is capable of providing reliable QoS guarantee to the cognitive user and capable of improving the frequency spectrum utilization rate of the system.

Description

technical field [0001] The invention belongs to the resource allocation scheme design of a cognitive radio system in the wireless communication field, and relates to a resource allocation method based on effective capacity in a cognitive radio system. Background technique [0002] Due to the rise of various new services, such as telephone and video conferencing, intelligent services, etc., spectrum resources have become a scarce resource. Although the link adaptive technology and multi-antenna technology that have emerged in recent years can improve spectrum utilization, research shows that some licensed frequency bands, especially low frequency bands with better signal propagation characteristics, have extremely low spectrum utilization. In order to improve spectrum utilization and effectively utilize idle licensed frequency bands in different regions and at different times, cognitive radio has received more and more attention. The basic idea of ​​cognitive radio is to all...

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Application Information

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IPC IPC(8): H04W16/14H04W52/04H04W52/24H04W72/08
Inventor 吕刚明张培李国兵张国梅
Owner 永春县产品质量检验所福建省香产品质量检验中心国家燃香类产品质量监督检验中心福建
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