Radio dynamic spectrum access method for multiple users and multiple channels

A dynamic spectrum access, multi-channel technology, applied in electrical components, transmission monitoring, transmission systems, etc.

Active Publication Date: 2018-09-28
TONGJI UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In the traditional collaborative spectrum access scheme, whenever an authorized user in the system successfully sends a data packet, another unauthorized user will send back a data packet for confirmation after receiving it. However, there are many users in the overall radio network, and the frequent tasks of sending and receiving Information exchange incurs significant overhead

Method used

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  • Radio dynamic spectrum access method for multiple users and multiple channels
  • Radio dynamic spectrum access method for multiple users and multiple channels
  • Radio dynamic spectrum access method for multiple users and multiple channels

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Embodiment

[0103] Such as figure 1 , figure 2 , image 3 As shown, the present invention relates to a kind of radio dynamic spectrum access method for multi-user multi-channel, comprising the following steps:

[0104] Step 1. Online learning process:

[0105] 11) Treat other secondary users except the target secondary user as a virtual user.

[0106] 12) Whenever a data packet is successfully received or sent, the cluster head will broadcast an ACK / NACK message, ACK (Acknowledgment) means an acknowledgment signal, and NACK (Negative ACKnowledgment) means a non-acknowledgement signal.

[0107] 13) Obtain the subcarrier loading strategy of the virtual user by observing the number of K ACK / NACK messages sent by the virtual user per unit time, and calculate the packet arrival rate of the virtual user. The specific formula is as follows:

[0108]

[0109] in, is the packet arrival rate of other users except the target secondary user, E{μ j} is the loading ratio of virtual users on ...

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Abstract

The invention relates to a radio dynamic spectrum access method for multiple users and multiple channels. The method includes the following steps: S1, on the basis of a Dirichlet process, obtaining sub-carrier loading strategies and data packet arrival rates of all virtual users according to ACK/NACK messages broadcast by a cluster head in a cognitive radio network in a unit time; S2, defining a collision probability of a data packet of a target secondary user; S3, obtaining a probability density function obeyed by a data packet transmission delay of a target secondary user; S4, establishing arelationship between the data packet transmission delay and a queue delay of the data packet of the target secondary user, and obtaining total delay characteristics of multimedia transmission; S5, obtaining channel capacity characteristics of the multimedia transmission according to the frequency of data packet retransmission; and S6, constructing a service quality evaluation system by combiningthe capacity characteristics and the time delay characteristics and making an optimal data packet loading mode for the target secondary user by maximizing the service quality. Compared with the prior art, the method of the invention has the advantages of low cost, high practicability and the like.

Description

technical field [0001] The invention relates to the technical field of cognitive radio spectrum access, in particular to a radio dynamic spectrum access method for multi-user and multi-channel. Background technique [0002] Spectrum sensing is the core technology in cognitive radio. It needs to monitor the surrounding wireless environment in real time, provide available spectrum resources for unlicensed users, and ensure that licensed users occupy the current frequency band in a timely manner to avoid interference. Therefore, the accuracy of spectrum sensing plays a very critical role for cognitive radio networks. A lot of research work on spectrum sensing technology has provided many detection methods based on signal processing, and these detection methods can be mainly divided into two categories: non-cooperative spectrum sensing and cooperative spectrum sensing. [0003] With the development of wireless communication technologies, people's demand for wireless communicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382H04B17/309
CPCH04B17/309H04B17/382
Inventor 黄新林唐小伟高煜
Owner TONGJI UNIV
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