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Method for improving WiMAX performance based on periodogram testing and spectrum pool

A periodogram and spectrum pool technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of insufficient utilization of frequency resources, subcarriers that cannot be used, and waste of frequency resources, so as to improve WiMAX performance and improve utilization. rate, and the effect of avoiding interference

Inactive Publication Date: 2009-11-18
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Therefore, although this solution can improve spectrum utilization and improve WiMAX performance, it still cannot make full use of frequency resources.
That is, in this scheme, when some data subcarriers on a given frequency band are used, the remaining subcarriers cannot be used, resulting in a waste of frequency resources

Method used

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  • Method for improving WiMAX performance based on periodogram testing and spectrum pool
  • Method for improving WiMAX performance based on periodogram testing and spectrum pool
  • Method for improving WiMAX performance based on periodogram testing and spectrum pool

Examples

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Embodiment Construction

[0015] The schematic diagram of using periodogram detection technology and spectrum pooling technology to improve WiMAX performance is as follows figure 1 shown. Secondary users use periodogram detection technology to detect all subcarriers in a frequency band to obtain idle subcarriers in this frequency band; then perform spectrum marking according to the spectrum detection results, and decide whether to transmit data in this frequency band, and count idle subcarriers The total number; if the total number is greater than the system setting value, the secondary user decides to transmit data on the idle subcarriers in the frequency band, combined with the OFDM structure of the WiMAX physical layer, and uses the spectrum pool technology to realize baseband data transmission.

[0016] When a secondary user wants to transmit data in a certain frequency band, the secondary user must first detect whether there is a primary user on the frequency band (users who access a given frequen...

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Abstract

The invention provides an improving proposal of WiMAX performance, relating to a wireless communication system. Aiming at fully utilizing frequency resources, a periodogram testing technology is utilized by the invention, and all subcarriers on a certain frequency band are tested so as to judge whether only data subcarriers are occupied on the frequency band and the number of idle subcarriers; if the number of the idle subcarriers is larger than the minimum idle data subcarriers needed by data transmission each time, by utilizing a spectrum pool technology, and according to a WiMAX physical layer OFDM structure and system throughput, secondary user data is transmitted on the idle data subcarriers of the frequency band, and data 0 is transmitted on non-idle data subcarriers. The proposal for improving WiMAX performance by utilizing periodogram testing technology and spectrum pool technology improves the utilization ratio of frequency spectrum resources by utilizing the existing usable idle data subcarriers as much as possible, and avoids the interference between primary level user and secondary level user and improves the WiMAX performance simultaneously.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to improvement of WiMAX performance. Background technique [0002] Due to the shortage of spectrum resources, the WiMAX system should have the ability to flexibly access spectrum holes and communicate. The spectrum hole here can be in the licensed frequency band or in the unlicensed frequency band. Therefore, the WiMAX system should have the ability to detect idle spectrum, and there are inevitably problems of interference and coexistence. Cognitive Radio (CR, Cognitive Radio) is considered to be the best solution to improve spectrum utilization and solve interference coexistence. The idle spectrum detection technology is one of the key technologies of cognitive radio. Some literature proposes a scheme to improve WiMAX performance by using cognitive radio [T.Yucek and H.Arslan, "Spectrum Characterization for Opportunistic Cognitive Radio Systems", Military Communications Confe...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00H04B17/309
Inventor 谢显中黄秋宴
Owner CHONGQING UNIV OF POSTS & TELECOMM
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