Method and device for realizing AGC (automatic gain control) gain gear control

Abstract

The invention relates to a method and a device for realizing AGC (automatic gain control) gain gear control, wherein the method comprises the following steps: setting an AGC gain gear obtained from a main carrier frequency as an initial gear in a special state when an MS (mobile station) enters the special state from a free state; detecting a signal-to-noise ratio of an input signal when the MS enters the special state; and controlling the AGC gain gear control by the signal-to-noise ratio of the input signal when the signal-to-noise ratio is not less than a preset threshold value. With the adoption of the method and the device of the embodiment provided by the invention, error codes of a first business block in the special state can be effectively avoided, and the situation that a gear is locked can be effectively avoided, so that the normal operation of the business can be ensured.

Description

technical field [0001] The invention relates to the technical field of data transmission control, in particular to a method and device for realizing AGC gain gear control. Background technique [0002] Due to the different conditions of the wireless channel, the input signal level of the RF receiver varies in a large range, often as small as below -110db and as large as above -10db; when the input signal strength is very different, in order to ensure that the The linear amplification is not saturated and distorted. Usually, it is necessary to control the AGC (Auto Gain Control) gain of the RF receiver according to the strength of the input signal to keep the output signal of the RF receiver at an appropriate level. [0003] At present, four AGC gain gears are usually used in the prior art, which respectively correspond to four intervals of the input signal. When the AGC gain gear matches the input signal strength, the RF receiver can output an appropriate output signal, but ...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned method of controlling the AGC gain gear by using the signal-to-noise ratio has excellent performance when the MS (Mobile Station, mobile station) is in the dedicated state when the data transmission or voice service is in progress, but when the MS enters from the idle state In the dedicated state, there is an obvious defect: since this method uses the default gear as the initial gear of the dedicated state, when the actual signal strength of the service channel does not match the default gear, it is very easy to cause the first time after entering the dedicated state. At the same time, when the signal strength of the main carrier frequency is strong and the signal strength of the subcarrier frequency is weak, the AGC gain gear is controlled according to the signal-to-noise ratio in the above manner, which may cause the gain gear to be locked, resulting in Business cannot proceed normally

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