Automatic LTE terminal receiver gain control achieving method

Abstract

The invention discloses an automatic LTE terminal receiver gain control achieving method. According to the method, an FPGA controls an analog attenuator and a digital attenuator to adjust the input signal power to be within the target range, and a CPU configures and adjusts the stepping value and all power gates; the AGC function is enabled, the FPGA conducts statistics on the baseband data power of one frame and sends the power to an AGC control module, and the AGC control module judges the segment of the power range according to the current statistics power value, so that operation of the analog attenuator or operation of the digital attenuator is conducted at the beginning of one frame, one stepping value is adjusted at a time, and the final target power is reached through multiple adjustment.

Description

technical field [0001] The present invention relates to the field of communication technology, and more precisely, relates to a method for realizing automatic gain control of an LTE terminal receiver. The method can keep the digital domain power of the signal entering the receiver within a specified range. The size of the specified range is It needs to be determined according to the actual application scenario and system requirements. Background technique [0002] LTE is the long-term evolution of 3G, which is currently called 4G. In the LTE terminal receiver, because the distance between the receiver and the radiation source can change greatly, the radio wave has obvious fading phenomenon in space propagation, and some other Interference factors cause great changes and fluctuations in the signal strength acting on the input of the receiver, but the terminal equipment of the receiver can only process signals with little change in amplitude, and the signal is too strong or to...

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Problems solved by technology

[0003] The traditional AGC method uses a variable gain amplifier and an external detector, or a digital AGC method to achieve the purpose of automatic gain control. This method has the following disadvantages: First, it requires additional external circuits and integrated chips to complete and increase the cost; Second, random timing of gain control will easily destroy the frame structure; third, the flexibility is poor, and the gain step value cannot be adjusted flexibly; fourth, since the power adjustment is completed at one time, it is easy to cause a sudden large signal when the power changes greatly jumps, resulting in a large jump in the SINR, and the terminal connection is released

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