Digital automatic gain control implementation method in pulse signal receiver

Abstract

The invention provides a digital automatic gain control implementation method in a pulse signal receiver, and belongs to the field of UWB communication positioning. The method comprises the following steps: firstly, determining parameters of automatic gain control (AGC) according to a selected signal mode, sampling a section of signal containing pulse according to a set sampling frequency in each adjustment period, then calculating a corresponding module value, and correspondingly updating the maximum pulse amplitude; and respectively calculating the gain variation when no sampling overflow exists and the gain variation correction when sampling overflow exists through judgment, and summing the decibels of the gain variation and the gain variation correction to obtain the final gain adjustment so as to realize the automatic gain control of the variable gain amplifier. According to the invention, the problems of inaccurate signal power detection, slow response and slow tracking speed of digital AGC in a pulse signal receiver are solved. In addition, due to the fact that the operand is reduced, the method has the advantages of being low in power consumption and low in cost in practical application.

Description

technical field [0001] The invention belongs to the field of UWB communication positioning, in particular to a method for realizing digital automatic gain control in a pulse signal receiver. Background technique [0002] Automatic gain control is a basic building block in a communications receiver. In communication, due to the influence of the channel, when the signal reaches the receiver antenna, the amplitude may be small or large. In order to ensure the normal operation of the receiver, the signal needs to be amplified to an appropriate range. The function of Automatic Gain Control (AGC) is to determine the gain value of the amplifying circuit and adjust the magnitude of the received signal according to the power of the received signal. AGC can be completed entirely by analog circuits, or it can be completed jointly by analog and digital. The basic modules of digital AGC are variable gain amplifier (including a series of analog devices, such as LNA, mixer, VGA, etc.), ...

AI Technical Summary

Problems solved by technology

[0009] 2. Large amount of calculation

According to the sampling theorem, the minimum sampling frequency of UWB signals is about 1G Hz, and the large amount of calculation brings a series of problems such as cost and power consumption.

[0010] 3. Slow convergence

The disadvantage of this method is that it takes a long time for the filter to stabilize the output, which solves problem 1 and aggravates problems 2 and 3

The disadvantage of this method is that it requires additional circuitry and is too complicated

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