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Method for distributing frequency band of cognitive radio network

A cognitive network and frequency band allocation technology, applied in the field of network communication, can solve problems such as difficult to obtain perception effects

Inactive Publication Date: 2014-11-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, considering the randomness and burstiness of PU traffic, it is difficult to achieve a better perception effect simply by relying on the perception ability of the SU
[0007] However, the existing literature lacks the practice of using optimized PU traffic allocation to improve SU perception effect.

Method used

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  • Method for distributing frequency band of cognitive radio network
  • Method for distributing frequency band of cognitive radio network
  • Method for distributing frequency band of cognitive radio network

Examples

Experimental program
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Effect test

Embodiment

[0068] Such as figure 1 As shown, a wireless cognitive network frequency band allocation method includes the following steps:

[0069] S1 Set the total available bandwidth W of the PU (Primary User, PU) in the current CRN (Cognitive Radio Networks, CRN) to 7.5Mbps, and determine the subcarrier bandwidth according to the premise of the cognitive wireless network processing capability and the minimum processing capability of the PU :

[0070] σ=H R / 2 M ,

[0071] Where M is a positive integer.

[0072] Obviously, choosing a larger M can obtain smaller σ and more subcarriers, refine the traffic resolution, and reduce the waste of frequency band resources in the traffic allocation process. However, more subcarriers will cause the peak-to-average power ratio (PAPR) of the subcarrier superimposition at the OFDM receiving end to be too high, resulting in overload due to nonlinearity and out-of-band radiation (out- of-band radiation) and other problems, reducing the application...

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Abstract

The invention discloses a method for distributing a frequency band of the cognitive radio network. The method includes the steps of determining the subcarrier band width according to the processing capacity of the cognitive radio network and the minimum distinguishable flow of a primary user, and dividing the total band width to form a set composed of subcarriers; then grouping the subcarrier set to obtain a channel set; distributing the flow of the primary user among channels to enable the channels to be completely occupied or idle. By means of the method, flow distribution and band with occupation of the primary user can be standardized, partial occupation of the channels is avoided, detection on the channel states by a secondary user in the cognitive radio network is simplified, the channel state detection efficiency is improved, and the transmission control complexity of the secondary user is reduced.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a wireless cognitive network frequency band allocation method. Background technique [0002] In the CRN network, primary users (Primary Users, PU) refer to those users who have high priority or legal authorization to use a certain spectrum, and secondary users (Secondary Users, SU) refer to those users with low priority. The use of the spectrum by the SU must not cause interference to the PU, so it is required to be able to quickly and reliably sense the use of the licensed spectrum by the PU. The SU must have the ability to recognize the existing channel occupancy, so it is also called cognitive users (Cognitive Users), and it is represented as a cognitive node in the network structure. [0003] The open spectrum usage strategy of the cognitive network allows the SU in the network to share the same frequency band with the PU of the licensed system. According to the agreemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04W72/08H04W72/54
Inventor 黄松许勇郑心炜张凌布社辉
Owner SOUTH CHINA UNIV OF TECH
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