Automatic gain control method and device of communication system

Abstract

The invention relates to an automatic gain control device of a communication system. The automatic gain control device comprises a device body and an antenna, and is characterized in that the device body is connected with the antenna through a radio-frequency cable; and the device body comprises a clock module, a radio frequency receiving module, an analog-to-digital conversion module, a basebandmodule, a digital-to-analog conversion module, a radio frequency transmitting module, a conditioning selection module, a terminal processing module and a power supply module. The invention further comprises a gain measurement method and corresponding equipment in the automatic gain control device of the communication system. According to the invention, the receiving of signals in a large dynamic range is realized; the interference of instantaneous noise generated in the receiving process on demodulation is effectively avoided; the bit error rate is greatly reduced; the baseband data processingperformance is better improved; and the automatic gain control device of the invention has the advantages of higher flexibility, high control precision and wide application.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for automatic gain control by means of real-time monitoring between communication nodes. Background technique [0002] In the wireless communication system, the signal will be affected by multipath fading during the transmission process, causing the signal power received by the receiver to fluctuate by more than 60dB. The hardware properties of the analog-to-digital conversion module in the receiver determine its fixed dynamic range, which is difficult to Sample large dynamic signals. In addition, transient noise occurs during reception, which interferes with proper demodulation of the signal. In order to ensure the normal operation of the communication system, the gain of the receiver needs to be adjusted. The early Automatic Gain Control (AGC) was mostly an analog circuit with a large dynamic range and high gain, but its stability was not high due t...

AI Technical Summary

Problems solved by technology

If the digital AGC gain stabilization time is longer than the gain control reserved time, the amplitude of the beginning part of the received signal will fluctuate greatly, which will affect the demodulation of effective data, resulting in an increase in the bit error rate, seriously affecting the baseband processing performance, reducing The digital AGC gain stabilization time has a very practical effect on improving the performance of the communication system

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