Resource distributing method having QoS requirement in CR OFDM system

A resource allocation and resource technology, applied in transmission systems, transmission monitoring, electrical components, etc., can solve problems affecting the communication quality of cognitive users, etc.

Inactive Publication Date: 2009-06-17
COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the resources allocated by the system cannot meet the QoS requirements of co...

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  • Resource distributing method having QoS requirement in CR OFDM system
  • Resource distributing method having QoS requirement in CR OFDM system
  • Resource distributing method having QoS requirement in CR OFDM system

Examples

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Embodiment Construction

[0047] A specific example of the present invention is described as follows, the system simulation adopts MatLab simulation, and the parameter setting does not affect the generality. use figure 1 Medium spectrum usage model, a base station (BS) in the system serves 1 licensed user and 4 cognitive users u 1 , u 2 , u 3 , u 4 , authorized users use the intermediate bandwidth W l =0.3125Hz frequency band, transmit power is 1W, interference threshold is I th = 0.002W, the power spectral density is replaced by an elliptic filtered white noise signal for cognitive users using adjacent frequency bands. The authorized user power spectrum is specifically implemented in MatLab using a bandpass elliptic filter, and the parameters are set to:

[0048] The frequency range of the filter is 0 to 5.3125MHz, and the maximum attenuation of the passband ripple is R p =3dB, the minimum attenuation R of the stop band ripple s =40, passband normalized cutoff frequency W ...

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Abstract

The invention provides a method with the QoS requirement for distributing resources in a CR OFDM system, which comprises the following steps: selecting a cognitive user whose gamma m is maximal from a to-be distributed cognitive user set UM, distributing the proper sub-carrier wave, power and bit number for the cognitive user according to the principle that the gain factor gamma mn is larger than the priority or the bit numbers are approximate, newly confirming to-be distributed sub-carrier wave sets SN and UM, newly calculating the interference I generated to the users by the cognitive users, if the I is bigger than the interference threshold value Ith of the authorized users, canceling the sub-carrier wave and the distributing of the power and the bits and finishing the distributing work, if the UM has no to-be distributed cognitive users and the SN still has the to-be distributed sub-carrier wave resources, then distributing the residual carrier waver resources. The method considers the two restraining conditions of the interference threshold and the QoS requirement of the users, thereby further improving the availability ratio of the frequency spectrum and the distributing of the recourses.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a resource allocation algorithm applied in a cognitive radio (cognitive radio, CR for short) orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, short for OFDM) system. Background technique [0002] With the widespread use of multimedia services in wireless communication, wireless communication has entered an era of high-speed data transmission. However, the higher the data transmission rate, the stronger the intersymbol interference and the more serious the impact on system performance. OFDM technology can solve this problem very well. It converts the high-speed data stream into a data stream with a relatively low transmission rate and transmits it on several sub-carriers through serial-to-parallel conversion, which greatly reduces the damage of intersymbol interference to the signal. , which improves the performance of the sys...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04B17/00H04B17/382
Inventor 王金龙吴启晖周广素刘琼俐张玉明
Owner COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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