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Automatic gain control method and system

A technology of automatic gain control and gain error, applied in the field of communication, can solve the problems of slow terminal access or switching cells, long time consumption for cell search, etc., and achieve the effects of receiving signal quality protection and fast robustness

Active Publication Date: 2017-04-05
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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Problems solved by technology

Therefore, the cell search takes a long time, which makes the terminal access or switch cells slower.

Method used

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  • Automatic gain control method and system

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specific Embodiment

[0078] A specific embodiment, with reference to Figure 4 , including the following steps:

[0079] Step s1, judging whether the average power of the first received signal has been counted, if not, continue to execute step s1, if yes, execute step s2;

[0080] Step s2, calculating the difference between the average power of the first received signal and a first target power to calculate the down-regulation gain error;

[0081] Step s3, judge whether the down-adjusted gain error is greater than or equal to 0, if not, select the down-adjusted gain error to adjust the gain of the radio frequency amplifier, and reset the average power of the first received signal and the average power of the second received signal, if yes, perform the step s4;

[0082] Step s4, judging whether the average power of the second received signal has been counted, if not, execute step s1;

[0083] Step s5, calculating the difference between the average power of the second received signal and a second...

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Abstract

The invention relates to the technical field of communication, and specifically relates to an automatic gain control system. The system comprises a first power statistic module which is used for the statistics of the mean power of first receiving signals in a first time period statistic duration; a second power statistic module which is used for the statistics of the mean power of second receiving signals in a second time period statistic duration; a down-regulation gain error calculation module which is used for calculating the difference between the mean power of first receiving signals and a first target power, so as to obtain a down-regulation gain error; an up-regulation gain error calculation module which is used for calculating the difference between the mean power of second receiving signals and a second target power, so as to obtain an up-regulation gain error; and a gain error selection module which is used for selecting a corresponding gain error so as to adjust the gain of a radio frequency amplifier of a receiver. According to the invention, the system is quick and high in robustness, protects the stability of gain control while obtaining good receiving signal quality, can greatly reduce the cell searching time, and guarantees the fixed point performance needed by a cell searching algorithm.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to an automatic gain control method and system. Background technique [0002] In the communication system, the signal is amplified and adjusted to the appropriate power by the radio frequency amplifier (LNA / PGA) of the receiver, and then enters the analog / digital converter (Analog to Digital Converter, ADC) to convert the analog signal into a digital signal. If the amplifier is amplified too much, it will cause the signal to exceed the range of the analog / digital converter, the signal will be saturated and clipped, and the signal quality will be damaged; The signal fixed-point accuracy is too low, which affects the demodulation and reception algorithm. [0003] The Automatic Gain Control (AGC) device automatically adjusts the power of the received signal to the target power through a feedback loop, so that the signal is not saturated and the fixed-point accuracy is g...

Claims

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Application Information

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IPC IPC(8): H04W52/52H04J11/00
CPCH04J11/0069H04W52/52
Inventor 李俊强周玉泽
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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