Power spectrum profile generation and step-type power control method in multiple carrier wireless cognitive link
A cognitive wireless and power control technology, applied in power management, wireless communication, transmission monitoring and other directions, to achieve the effect of improving power distribution, improving utilization, and suppressing interference
Inactive Publication Date: 2011-11-16
ZHEJIANG UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of how to rationally improve access channel capacity and spectrum utilization by means of power allocation and adaptive power adjustment under the constraints of limited interference of cognitive users to primary users in cognitive wireless networks
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0069] 1) if figure 1 As shown in the schematic diagram of the cognitive user access power control process, the cognitive user to be accessed first obtains the activity status of the primary user and the idle state of the wireless spectrum through spectrum sensing. Suppose cognitive users adopt N fft = 256-point FFT transformation, subcarrier spacing Δf = 0.3125MHz, OFDM symbol spacing T s = 4μs. Spectrum idle conditions perceived by cognitive users are as follows: figure 2 As shown, there are two active spectrums with bandwidths B1=2MHz and B2=5MHz in the sensing spectrum, assuming that the cognitive user selects the idle spectrum between the two active frequency bands as figure 2 The N=16 subcarriers shown are access frequency bands. Cognitive users estimate the interference noise that each access subcarrier power component will cause to the active spectrum according to the following formula:
[0070] I i = ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a power spectrum profile generation and step-type power control method in multiple carrier wireless cognitive link. In the wireless cognitive network, a cognitive user to be accessed obtains the use condition of frequency spectrum through spectrum sensing, calculates the power distribution coefficient on each subcarrier and generates the transmission power spectrum profile; a cognitive user receiving terminal feeds back the power control information according to the currently detected signal-to-interference and noise ratio of signal and the own threshold demand and a sending terminal gradually adjusts the transmission power according to the power control information which is fed back. By adopting the step-type power control method of the invention, the cognitive user can effectively perform opportunity access and utilize the frequency spectrum while the disturbance constraint of the primary users is satisfied; in addition, by adopting the power distribution method based on the features of the power spectrum profile of the invention, the capacity of the channel accessed by the cognitive user can be increased while the disturbance constraint condition of the primary users can be ensured.
Description
technical field [0001] The invention relates to intelligent wireless transmission technology, in particular to a power spectrum profile generation and step-by-step power control method in a multi-carrier cognitive wireless link. Background technique [0002] As a limited natural resource, wireless spectrum has been developed and utilized by human beings, but due to unreasonable spectrum allocation management, available broadband continuous spectrum resources are increasingly scarce. FCC statistics show that the global frequency spectrum below 5 GHz is divided into many independent frequency bands, and the average utilization rate of these frequency bands is less than 3% to 5%, which means that the limited spectrum resources have not been reasonably and fully developed and utilized. The proposal of cognitive radio is considered to be the most effective and reasonable method to solve spectrum sharing and improve spectrum utilization. In a cognitive wireless network, the prima...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/36H04B17/00H04B15/00H04B17/382
Inventor 姜松张朝阳张建敏林泽李雪娇陈淑保
Owner ZHEJIANG UNIV