An OFDM time-frequency resource allocation method

An allocation method and technology of time-frequency resources, applied in the field of network communication, can solve problems such as difficulty in obtaining perceptual effects, inability to ensure high resource utilization, lack of resources, etc.

Inactive Publication Date: 2017-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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] In addition, when the length of the PU data packet (packet) changes greatly, relying solely on frequency division or purely relying on time slot division cannot guarantee high utilization of resources
It is necessary to consider the two dimensions of time and frequency at the same time, reasonably allocate PU traffic in the time-frequency space, and select an appropriate idle time-frequency resource block (Time-frequency block) for the SU, so as to solve the problem of PU traffic at the packet level and the problem of low resource utilization caused by suddenness at the bit level, but the existing literature lacks this approach

Method used

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  • An OFDM time-frequency resource allocation method
  • An OFDM time-frequency resource allocation method
  • An OFDM time-frequency resource allocation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Such as figure 1 As shown, a method for allocating OFDM time-frequency resources includes the following steps:

[0075] S1 Set the available total bandwidth W of the PU (Primary User, PU) in the current CRN (Cognitive Radio Networks, CRN) to 7.5 Mbps, and determine the optimal subcarrier bandwidth according to the premise of the cognitive wireless network processing capability:

[0076]

[0077] where M β is a positive integer.

[0078] Obviously, choosing a larger M β Smaller σ and more subcarriers can be obtained, the traffic resolution can be refined, and the waste of frequency band resources in the process of traffic allocation can be reduced. 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 efficiency of the device.

[0...

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Abstract

The invention discloses a method for allocating OFDM time-frequency resources, which divides available time-frequency resources into a set of time-frequency resource blocks from two dimensions of time slots and channels, and divides the flow of primary users in the time-frequency resources Allocate within a set of blocks so that any time-frequency resource block is either fully occupied or completely free. The invention can standardize the use of time-frequency resources of primary user traffic, separate the time-frequency resources occupied by primary users and secondary users, avoid the situation that the two share time-frequency resource blocks, and improve the time-frequency resource utilization of secondary users. ‑The detection efficiency of frequency resource status reduces the complexity of data transmission control for secondary users.

Description

technical field [0001] The invention relates to the field of network communication, in particular to an OFDM time-frequency resource 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 agreement reached wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
Inventor 黄松郑心炜
Owner SOUTH CHINA UNIV OF TECH
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