A Fast and Accurate Automatic Gain Control Method

Abstract

The invention provides a quick and accurate automatic gain control method. The method comprises the following steps of step s1, reading a reference level and a trigger level; step s2, performing signal trigger trying in a Trigger mode through the trigger level, if the trying is successful, skipping to the step s301, and if the trying is not successful, skipping to the step s5; step s301, recording the tried gear to trigger trying to be successful; step s302, recording peak power corresponding to the gear which is successfully triggered; step s4, verifying according to the peak power obtained in the step s302, after the verification is successful, directly retreating, and if the verification fails, after fine tuning the reference level, skipping to the step s2; step s5, running a Free Run mode to perform non-triggering grabbing, if the running is successful, kipping to the step s302, and if the running is not successful, entering the next gear which is not subjected to trigger trying. The irrelevance between power and frequency is eliminated, and automatic gain control is more quickly and accurately finished.

Description

technical field [0001] The invention relates to an automatic gain control method, in particular to a fast and accurate automatic gain control method. Background technique [0002] Usually, before measuring the transmission quality of RF signals, it is necessary to adjust the reference level of the receiver to a suitable position, so that the transmission quality can be measured more accurately, and the reference level is too high will affect the peak signal of the signal received by the receiver. The noise ratio, the peak signal-to-noise ratio is often abbreviated as PSNR, is an engineering term that represents the ratio of the maximum possible power of a signal to the destructive noise power that affects its representation accuracy. Since many signals have a very wide dynamic range, the peak The signal-to-noise ratio is often expressed in dB units; if the reference level is too low, the signal will be compressed and distorted. [0003] As a widely used test product, wirele...

AI Technical Summary

Problems solved by technology

[0005] The advantage of the hardware detection method is that it is fast, but there are two disadvantages: the first disadvantage is that the relationship between the power detected by the hardware and the required frequency is relatively weak, that is, it can only process such as figure 1 The power versus time shown is independent of the frequency band where the power is concentrated, as in figure 2 The power in the frequency range to be judged shown may be inconsistent with the frequency range of the actual power concentration, if such image 3 In the case of inconsistency shown, the power value detected by the hardware is equal to the actual power value, but not the power value in the frequency band that the user needs to detect. There may be a relatively large difference between the two power values, resulting in inaccurate AGC; The second disadvantage is that if figure 1 When the "transmission gap" shown is relatively large, such as figure 1 If it is more than 10,000 times of the "signal transmission section" in the middle, the power value judged by AGC will become very inaccurate

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