A FPGA-based digital AGC control method and system

Abstract

The invention provides a digital AGC control method and system based on FPGA. The method comprises the following steps: receiving a sampling signal obtained by sampling an output signal of an AGC chipby an analog-to-digital converter; computing a power value of the sampling point, and performing detection processing on the sampling signal after the power value computation according to a preset detection condition; if judging that the sampling signal power value difference between any two adjacent computations in the first preset time quantum is not bigger than a first preset threshold, determining a standard power value based on the sampling signal power values computed in the first preset time quantum; and if the standard power value exceeds a preset sampling interval of the analog-to-digital converter, configuring a gain value of the AGC chip according to the standard power value and an interval value of the analog-to-digital converter preset sampling interval, thereby enabling thesampling signal power value sampled by the analog-to-digital converter to be located in the preset sampling interval. The control method provided by the application has the features of being fast in convergence time and large in dynamic range, and provides guarantee for accurately estimating the signal amplitude in the private network monitoring.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an FPGA-based digital AGC control method and system. Background technique [0002] With the development of the private network market, radio private network signals are gradually increasing. Correspondingly, the functional requirements for the private network monitoring platform have also increased. Considering the fact that the base station coverage of the private network is lower than that of the public network, it is necessary to put forward further requirements for the dynamic range of the private network monitoring receiver. At present, in order to improve the dynamic range of the receiver, the AGC (Automatic Gain Control, automatic gain control) control method is widely used, so that the gain of the receiver is adjusted according to the strength of the signal, and the quality of the AGC control method directly affects the receiver. The dynamic range of the signal. ...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the above requirements, the existing AGC control method uses a wireless IF receiver with full digital AGC to realize a digital AGC control method without manual debugging, but this control method lacks corresponding indicators such as convergence time and amplitude control accuracy.

In addition, the existing all-digital AGC control method and system applied in the TDMA (Time Division Multiple Access) system can also realize the digital AGC control method of the time-division system, and the convergence time is relatively short, but this control method Lack of support for multiple IFs and amplitude accuracy metrics

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