Fast automatic gain control method

Abstract

The invention provides a fast automatic gain control method. The method includes: setting a threshold value of the energy value of the input signal; determining a signal whose intensity exceeds the range indicated by the analog-to-digital converter according to the threshold value, and adopting analog gain control to reduce the energy of the signal; converting the reduced signal energy Comparing with the target energy to determine the gain of the automatic gain control, and using the gain to adjust the intensity of the input signal so that its intensity reaches the required specific range. The invention can make the signal receiving system in the WLAN communication have the ability of fast automatic gain control, and can make the signal receiving system achieve the best receiving effect.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a fast automatic gain control method. Background technique [0002] WLAN (Wireless Local Area Network) technology is one of the most promising technologies in the field of wireless communication in the new century. At present, WLAN technology has become increasingly mature and widely used. WLAN is a flexible data communication system, which sends and receives data wirelessly, and the highest data rate it can transmit reaches 54M / bps. Under the condition that the development of mobile 3G (3rd generation mobile communication) is hindered, using WLAN as an alternative to 3G has become the first consideration direction of various telecom operators. [0003] In WLAN communication, the signal strength received by the receiving party will be affected by various factors such as the distance of the signal sending and receiving party, the state of the signal transmission channel, and...

AI Technical Summary

Problems solved by technology

[0004] The principle of the AGC method in the WLAN communication in the prior art is generally: the existence of the signal is judged by detecting the strength of the input signal in a short period of time, and the gain of the system to the input signal is determined by using multiple detections and gradually approaching, and then the The signal is demodulated without grading the energy of the input signal, and different gain control processes are used for input signals of different energy levels. The disadvantage of this method is that it takes a long time and is difficult to apply to AGCs that require a higher speed. high environment

Moreover, it lacks the ability to discriminate low-intensity signals. In an environment with a small signal-to-noise ratio, the probability of false start is high, resulting in an increase in system power consumption.

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