Fast automatic gain control method of intermediate-frequency digital receiver

Abstract

The invention discloses a fast automatic gain control method of an intermediate-frequency digital receiver. The method comprises the following steps: firstly acquiring a signal intensity posterior knowledge table to judge signal intensity, and then acquiring an attenuation parameter posterior knowledge table, recording AD values of intermediate-frequency output peaks of the signals with differentintensities under various attenuation conditions of a radio frequency front-end device as the attenuation parameter posterior knowledge table, wherein the attenuation parameter posterior knowledge table is used for querying the attenuation gear stage needing to be set by the radio frequency front-end device when the AD value of the signal peak at a certain intensity is located in a specified range. When the signal is relatively small, once setting and querying process can be performed so as to reduce the attenuation degree of the radio frequency front-end device after the first setting and querying. But the frequency needing to be set is located within trice, and the fast automatic gain control of the receiver is realized.

Description

technical field [0001] The invention relates to the technical field of radio monitoring in a wireless communication system, in particular to a fast automatic gain control method for an intermediate frequency digital receiver. Background technique [0002] With the development of the Internet, the demand for radio communication is also increasing, which also brings pressure on the radio supervision of government departments. In radio monitoring equipment, intermediate frequency digital receivers are widely used. In order to be able to adapt to a wide range of signal strength changes, the receiver usually adds an automatic gain control link to dynamically adjust the attenuation gear of the RF front-end device in the receiver. [0003] The conventional automatic gain control process of the receiver is to continuously adjust the attenuation degree according to the AD sampling value of the peak value of the intermediate frequency signal output by the RF front-end, and finally ma...

AI Technical Summary

Problems solved by technology

For a signal of the same strength, due to the non-linear correlation between the attenuation parameter and the signal peak AD value, when the signal is large or small, the conventional automatic gain control process will include more operations for querying and setting the RF front-end device, while Adjusting the attenuation degree and setting the RF front-end device is a relatively time-consuming process. If this process occurs too many times during an automatic gain control, it will take too much time for an automatic gain control process, which will affect the receiver's overall performance. The scanning speed of the monitoring frequency band affects the timeliness of the output data of the receiver

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