Digital automatic gain control method for narrow-band signal after broadband system channelization

An automatic gain control and narrowband signal technology, applied in wireless communication, power management, electrical components, etc., to achieve the effect of simple method, high reliability, and strong practical application value

Active Publication Date: 2017-08-04
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0004] Aiming at the influence of time fluctuation of narrowband signal energy after channelization of the existing broadband signal processing system on hearing discrimination and demodulation based on fixed-point format ...

Method used

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  • Digital automatic gain control method for narrow-band signal after broadband system channelization
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  • Digital automatic gain control method for narrow-band signal after broadband system channelization

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Embodiment 1

[0037] Embodiment one, see figure 1 As shown, a digital automatic gain control method for channelized narrowband signals in wideband systems comprises the following steps:

[0038] Step 1. Calculate the difference between the average power of the current data frame and the reference power, and perform stepwise correction and adjustment of the power gain coefficient according to the difference;

[0039] Step 2. Convert the adjusted power gain coefficient into an amplitude gain value, and perform product calculation according to the gain coefficient of the previous frame data to obtain a final signal output.

[0040] The present invention first calculates the difference between the average power of the current data frame and the power reference, and adjusts the step power gain coefficient according to the difference using a parabolic nonlinear method; converts the power coefficient into a gain value, And the "stepped" correction method is used to adjust the signal gain coeffici...

Embodiment 2

[0041] Embodiment two, see Figure 1~3 As shown, a digital automatic gain control method for channelized narrowband signals in wideband systems includes the following content:

[0042] 1) Calculate the difference between the average power of the current data frame and the reference power, and perform stepwise correction and adjustment of the power gain coefficient according to the difference, including the following:

[0043] 1) Assuming that the frame length of the current received signal data is N, perform radix 2-FFT operation on N point samples to obtain the frequency domain data of the current received signal; perform radix 2-FFT operation on N point samples, including the following content: by calculating The formula completes the conversion from the time domain to the frequency domain, and the formula is as follows:

[0044]

[0045] Among them, X(k) is the frequency domain data of the currently received signal; N is the number of data points, and the value is an in...

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Abstract

The invention relates to a digital automatic gain control method for a narrow-band signal after broadband system channelization. The method comprises the following steps: calculating average power of a current data frame and a reference power difference, and performing stepped correction and adjustment on a power gain coefficient according to the difference; and converting the adjusted power gain coefficient into an amplitude gain value, and performing multiplication according to the gain coefficient to the last frame of data to obtain a final signal, and outputting the signal. The method provided by the invention is simple and easy to implement, the power difference is calculated, and the stepped correction is performed on the power gain coefficient by using a quasi parabolic nonlinear method; and the power gain coefficient is converted into the gain value, and the multiplication is carried out through the gain coefficient to the last frame of data, thereby effectively solving the quantization error problem in the conversion of a floating point into a fixed point and improving the hearing judging effect of the signal, and the digital automatic gain control method has the advantages of easy implementation, high reliability and high practical value.

Description

technical field [0001] The invention belongs to the technical field of digital automatic gain control, and in particular provides a digital automatic gain control method for the narrowband signal after channelization of the broadband system for the gain control problem of the narrowband signal after the broadband system is channelized. Background technique [0002] With the rapid development of signal processing technology, broadband signal processing systems have been widely used in many fields such as communication signal reconnaissance, electronic information countermeasures, radio monitoring, telemetry and navigation. In practical broadband systems, in order to meet the requirements of the front-end A / D processing dynamic range, the analog automatic gain or digital automatic gain circuit is often used to adjust the signal amplitude. Analog automatic gain control is usually composed of a variable gain amplifier or a variable attenuator to complete gain control according t...

Claims

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Application Information

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IPC IPC(8): H04W52/18
CPCH04W52/18
Inventor 吴志东杨宾吴瑛张莉唐涛吴江王鼎
Owner THE PLA INFORMATION ENG UNIV
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