Method and device for estimating blind signal bandwidth

A bandwidth estimation and signal bandwidth technology, applied in the baseband system components, multi-frequency code system, etc., can solve the problems of low accuracy and large bandwidth error, and achieve the effect of improving accuracy and accurate estimation results

Inactive Publication Date: 2010-12-08
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0004] In view of this, the present invention provides a blind signal bandwidth estimation method and device to solve the problem of large error and low accuracy in the bandwidth estimated by using the prior art

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  • Method and device for estimating blind signal bandwidth
  • Method and device for estimating blind signal bandwidth
  • Method and device for estimating blind signal bandwidth

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specific Embodiment approach

[0047] In a blind signal bandwidth estimation method disclosed in the present invention, the process of further smoothing the input signal by using the variable window length adjusted according to the initial estimated bandwidth of the input signal is added, so that the estimation result is more accurate and the precision is improved. Spend. Its specific implementation is as follows:

[0048] The flow of a blind signal bandwidth estimation method disclosed in this embodiment is as follows: figure 1 shown, including:

[0049] Step S11, transforming the received signal according to the preset discrete Fourier transform (DFT) points;

[0050] The number of points for DFT transformation can be selected according to the principles described below. Generally, the signal bandwidth range required by the cognitive radio system is [B min , B max ], the system estimation accuracy requirement is given as d n , the sampling frequency is f s , sampling frequency f s Given the proces...

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Abstract

The invention discloses a method and a device for estimating a blind signal bandwidth. The method comprises the following steps of: transforming a received signal according to a preset discrete Fourier transformation (DFT) point number; acquiring a mid-value bandwidth DFT point number corresponding to a bandwidth mid-value in a signal bandwidth range required by a system and calculating to obtainan initial sliding window length according to the mid-value bandwidth DFT point number; smoothing a DFT transformation result by using the initial sliding window length to obtain an estimated value of an initial bandwidth DFT point number; comparing the estimated value of the initial bandwidth DFT point number with the mid-value bandwidth DFT point number and selecting a window length factor according to a comparison result; acquiring a variable sliding window length processed by the window length factor; processing the DFT transformation result according to the variable sliding window length; and acquiring an estimated value of a signal bandwidth. In the method for estimating the blind signal bandwidth disclosed by the embodiment of the invention, the variable window length is adjusted by increasing the size of an initial estimated bandwidth of an input signal and the input signal is further smoothed, so that an estimated result is more accurate and accuracy is improved.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a blind signal bandwidth estimation method and device. Background technique [0002] In a cognitive radio system, the frequency range to be processed by the system is usually given when designing the system, that is, the bandwidth of the system receiver. Usually, there may be multiple signals entering the system receiver at the same time. The modulation methods of these signals are different, and the bandwidths of the signals are also different. The system usually only knows that the signal has been received, but does not know the bandwidth size, modulation type, carrier frequency and other information of the received signal. In order to better perform subsequent processing such as parameter estimation, modulation identification, and demodulation on the received signals, it is usually necessary to separate these simultaneously received signals and then estimate ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 胡赟鹏谢然田鹏武于宏毅张效义李青张霞
Owner THE PLA INFORMATION ENG UNIV
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