A receiver automatic gain control method and system

Abstract

The invention discloses an automatic gain control method for a receiver, which comprises collecting signals output by attenuation units in links of various levels of the receiver respectively; performing detection processing and analog-to-digital conversion processing on the signals collected in links of various levels respectively , and send the processed signals in the links at all levels to the FPGA control unit respectively; the FPGA control unit obtains the attenuation control signals corresponding to the links at all levels respectively according to the processed signals in the links at all levels and the preset gain control table, And the attenuation control signals corresponding to the links of each level are respectively sent in parallel to the attenuation units in the links of each level; the attenuation units in the links of each level respectively perform gain control processing on the signals input to the attenuation unit according to the attenuation control signals. The method can parallelly control the attenuation units in the links at all levels, and the control confusion of the links at all levels will not occur; and the automatic gain control range of the signal in the receiver is greatly improved. The invention also discloses a receiver automatic gain control system.

Description

technical field [0001] The invention relates to the field of automatic gain control, in particular to a receiver automatic gain control method. The invention also relates to a receiver automatic gain control system. Background technique [0002] Due to the higher and higher requirements for the communication rate and wider channel bandwidth, the linearity requirements for the receiver channel are also higher and higher. Therefore, certain requirements are put forward for the receiver link, and the receiver (such as The receiver using double frequency conversion) can automatically control the gain, so that the power output of the radio frequency signal can be kept within a stable range, so as to achieve the purpose of maintaining the maximum signal-to-noise ratio of the radio frequency signal. And for the receiver, if the receiver and the transmitter can realize normal communication at various distances, the receiver itself is required to have a very large gain control range...

AI Technical Summary

Problems solved by technology

[0004] These methods mainly include two types, one is to add an attenuator at the front end of the receiver link, but if only one attenuator is added, the automatic gain control range of the radio frequency signal is very limited, and it is not suitable for long-distance data transmission. transmission

[0005] The other is to add two or more stages of attenuators. This method can expand the range of automatic gain control. However, since the single-chip microcomputer cannot control the multi-stage attenuators at the same time, it is easy to cause adverse effects on the signals of the links of all levels of the entire receiver. stable impact

Images