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OFDM time-frequency resource distribution method

An allocation method and technology of time-frequency resources, applied in the field of network communication, can solve problems such as shortage, difficulty in obtaining perception effects, and low resource utilization

Inactive Publication Date: 2014-11-12
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 both time and frequency dimensions, reasonably allocate PU traffic in the time-frequency space, and select a suitable free time-frequency resource block (Time-frequency resource block) for the SU to solve the problem of PU traffic in the packet The problem of low resource utilization caused by the suddenness of level and bit level, but the existing literature lacks the practice of this aspect

Method used

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  • OFDM time-frequency resource distribution method

Examples

Experimental program
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Effect test

Embodiment

[0074] like 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] σ = W / 2 M β ,

[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 nonli...

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Abstract

The invention discloses an OFDM time-frequency resource distribution method. Available time-frequency resources are divided into a time-frequency resource block set from two dimensions of a time slot and a channel, flow of a main user is distributed in the time-frequency resource block set, and therefore any time-frequency resource block is completely occupied or completely free. According to the method, time-frequency resource use of the flow of the main user can be standardized, time-frequency resources occupied by the main user and secondary users are separated, the condition that the main user and the secondary users share the time-frequency resource blocks is avoided, the detection efficiency of the secondary users on the time-frequency resource state is improved, and the data transmission control complexity of the secondary users is reduced.

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 Applications(China)
IPC IPC(8): H04L5/00
Inventor 黄松郑心炜
Owner SOUTH CHINA UNIV OF TECH
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