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Spectrum pool system optimization method based on optimal wavelet filter

A wavelet filter and system optimization technology, applied in multi-frequency code systems, modulated carrier systems, transmission systems, etc., can solve the problem of sacrificing the data transmission rate of cognitive users, improve the performance of the spectrum pool system, reduce interference, suppress Effects of Multi-User Interference in Spectrum Pooling

Active Publication Date: 2018-10-09
NORTHEAST GASOLINEEUM UNIV
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a spectrum pool system optimization method based on the optimal wavelet filter, which is used to solve the necessary sacrifices in the existing spectrum pool multi-user interference suppression method. Cognitive user data transfer rate issues

Method used

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  • Spectrum pool system optimization method based on optimal wavelet filter
  • Spectrum pool system optimization method based on optimal wavelet filter
  • Spectrum pool system optimization method based on optimal wavelet filter

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention will be further described:

[0031] combine figure 1 , figure 2 As shown, this optimal wavelet filter-based spectral pooling system optimization method uses a tabu search to select the optimal wavelet modulation filter.

[0032] details as follows:

[0033] 1. Set the initial value.

[0034] Set the number of cognitive user subcarriers L, and set the maximum number of wavelet filter stages N max , set the taboo length T, set the value of the number of iterations K (K>L), and clear the initial counter.

[0035] 2. Create the initial wavelet filter.

[0036] for N max random selection Create an initial wavelet modulation filter using equations (1) and (2).

[0037]

[0038]

[0039] in, is the i-th filter of the V-th wavelet tree structure. is the i-th filter of the d-th layer of the V-th wavelet tree structure. is a random number in the range [0, 1]. according to different the ...

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Abstract

The invention relates to a spectrum pool system optimization method based on an optimal wavelet filter, specifically comprising the steps: step 1, setting an initial value; step 2, creating a waveletfilter; step 3, comparing symbol rates of the randomly generated wavelet packet tree structure and Mallat structure , wherein the symbol rates of the two structures are equal, and returning to the step 2 if not equal; step 4, coding; step 5, using the initial filter and the objective function value thereof as the current solution, and putting the solution into a taboo table; step 6, checking the taboo table, and regenerating a new filter in the neighborhood; step 7, comparing the symbol rates of the newly generated wavelet filter structure and the Mallat structure, updating the taboo table ifthe symbol rates of the two structures are equal, and returning to the step 6 if not equal; and step 8, comparing the objective function value of the new filter with the objective function value in the current solution to generate an optimal wavelet filter, and modulating the cognitive user signal by using the optimal wavelet filter to produce a smaller ICI. The invention is capable of reducing the interference affecting authorized users and optimizing the performance of the spectrum pool system.

Description

technical field [0001] The invention relates to the technical category of cognitive radio spectrum pool performance optimization, in particular to a spectrum pool system optimization method based on an optimal wavelet filter. Background technique [0002] The traditional wireless spectrum allocation scheme is to allocate most of the spectrum to radio business departments in a licensed manner, while the remaining small part of the spectrum is used as public unlicensed spectrum. This static spectrum allocation scheme leads to the contradiction that the utilization rate of the licensed frequency band is low and other users cannot use the idle frequency band. The cognitive radio technology based on the concept of dynamic spectrum access can make use of temporarily idle spectrum resources, which greatly improves the current tight situation of spectrum resources. Spectrum pooling is the most efficient spectrum usage technique in cognitive radio. The idea of ​​spectrum pooling is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/345H04B17/382H04L27/26
CPCH04L27/2691H04B17/345H04B17/382
Inventor 刘苗王忠东
Owner NORTHEAST GASOLINEEUM UNIV
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