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Method and system for controlling digital AGC in TDMA system

A control method, all-digital technology, applied in the direction of transmission control/equalization, etc., can solve the problems of difficult real-time AGC control, protracted processing time, low signal rate, etc., to achieve flexible and convenient settings, short processing delay, and data processing capacity small effect

Inactive Publication Date: 2007-11-21
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

Although the AGC control is well realized, the use of this method requires the support of the digital down-conversion subsystem, which limits the application occasions of the method, and in the statistical processing of the baseband signal power, it is necessary to calculate the I and Q two-way data power, large amount of calculation
After down-conversion processing, the signal rate generally becomes very low, so the processing delay for obtaining AGC decision information is too long, and it is difficult to realize real-time AGC control

Method used

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  • Method and system for controlling digital AGC in TDMA system
  • Method and system for controlling digital AGC in TDMA system
  • Method and system for controlling digital AGC in TDMA system

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Embodiment

[0032] As shown in Fig. 4 and Fig. 5, the all-digital AGC system applied in the TDMA system proposed by the present invention includes a numerical control adjustable gain amplifier, an A / D converter, an AGC decision device, and an AGC controller. The output end of the gain amplifier is connected with the input end of the AGC controller through the A / D converter, and the output end of the AGC controller is connected with the input end of the numerical control adjustable gain amplifier, and the AGC decision device includes a decision information extraction module and a decision condition An information generation module, the output end of the A / D converter is connected to the AGC controller through a decision information extraction module and a decision condition information generation module in sequence. A DC suppression processing module and an interference eliminator are also connected between the A / D converter and the AGC judger, and the A / D converter is connected to the AGC ...

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Abstract

The method comprises: the analog intermediate frequency signal is inputted, and then is converted to the digital signal by an A / D converter; according to the character of the digital intermediate frequency signal, AGC arbiter generates the decision term information of the controllable gain amplifier; after receiving the decision term information, AGC controller makes relevant time sequence adjustment based on the character of the controllable gain amplifier, and further controls the controllable gain amplifier to realize the feed-forward type AGC control handling of whole loop.

Description

technical field [0001] The invention belongs to the technical field of mobile communication wireless access, and in particular relates to an all-digital AGC control method applied in a TDMA system and a system thereof. Background technique [0002] Traditional wireless digital receivers use analog IF technology, but only use digital technology in the baseband signal processing unit. In order to improve the dynamic range of the receiver, it is necessary to implement AGC control in the receiver. [0003] Accompanying drawing 1 is the schematic structural block diagram of the analog AGC control method. It mainly performs AGC control on the input RF signal. The principle is: according to the RF power detector, the power of the input RF signal is detected, and the control information is output to control the front-end analog adjustable gain amplifier, thereby realizing the AGC of the RF signal. control. This method mainly uses analog devices to realize A...

Claims

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Application Information

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IPC IPC(8): H04B7/005
Inventor 胡应添张远见
Owner COMBA TELECOM SYST CHINA LTD
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