Radio frequency auto-gain control system and method

Abstract

The invention relates to a radio-frequency auto gain control method, comprising the following steps: step S202: the radio-frequency gain is set as N grade adjustable gain according to the requirements of the static sensitivity index of a radio-frequency receiver as well as sensitivity ranges corresponding to different radio-frequency gain values; step S204: when being powered and initialized, a variable gain amplifier is configured with an initial default gain value, and after the radio-frequency receiver works normally, the power of the receiving signal of an antenna port is calculated at a base band; step S206: according to the obtained power of the receiving signal of the antenna port and combining with the presently configured radio-frequency gain value, the radio-frequency gain values that need to be modified are calculated, and the radio-frequency gain value calculated by the former step is configured to the radio-frequency amplifier by a feedback control unit. The method of theinvention can calculate the gain value of the radio-frequency amplifier at the base band in the condition that the radio-frequency or digital intermediate frequency part is not added with a power detection circuit, thus realizing the automatic gain control of radio-frequency.

Description

technical field [0001] The invention relates to the communication field, in particular to a radio frequency automatic gain control system and method. Background technique [0002] In the field of wireless communication, due to the difference in transmission power and path loss of different mobile phones, the signal strength of different mobile phones received by the base station is different. In addition, when the location of the mobile phone moves, the strength of the signal received by the base station will also change. If the signal received by the base station is too large, it may exceed the linear amplification range of the RF receiver; and when the signal received by the base station is weak, it may not be able to detect useful signals, which requires the RF receiver of the base station to have a larger dynamic range and receiver sensitivity. [0003] The radio frequency automatic gain control realizes the automatic adjustment of the size of the received radio freque...

AI Technical Summary

Problems solved by technology

The core idea of ​​these two patents is to add a power detection circuit to the digital intermediate frequency or radio frequency part, and feed back the automatic gain control value according to the power detection result, and the control effect is not ideal

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