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Method and device for automatic gain control

一种自动增益控制、设备的技术，应用在增益控制、放大的控制、电气元件等方向，能够解决不能准确估计增益误差、不能准确估计信号功率、长调节周期等问题

Inactive Publication Date: 2013-01-16
THOMSON LICENSING SA
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Problems solved by technology

[0005] However, this conventional automatic gain control method has the following problem: Due to the clipping effect of the analog-to-digital converter, this conventional automatic gain control method is affected by the analog-to-digital converter
Traditional AGC cannot accurately estimate the signal level after the ADC because the higher amplitude signal is clipped
Therefore, when considering the clipping effect introduced by the analog-to-digital converter, the traditional AGC cannot accurately estimate the signal power, or cannot accurately estimate the gain error
[0006] In addition, because the traditional AGC cannot accurately estimate the signal power, the gain of the variable gain amplifier will be gradually adjusted, which will result in a longer adjustment period for the traditional AGC

Method used

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  • Method and device for automatic gain control
  • Method and device for automatic gain control

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Embodiment Construction

[0019] The advantages / features of the present invention will now be described in detail with reference to the accompanying drawings, based on illustrative examples of the invention. However, those skilled in the art will appreciate that the invention described herein with respect to automatic gain control is not limited to these examples, nor is its application limited to OFDM receivers, but rather can be used in any multi-carrier receiver with automatic gain control middle.

[0020] figure 1 is an illustrative block diagram showing OFDM receiver 100 with AGC device 105 . The configuration and operation of the OFDM receiver 100 will now be described.

[0021] Such as figure 1 As shown, an OFDM receiver 100 includes a filter and mixer 101 , a variable gain amplifier (VGA) 102 , an analog-to-digital converter 103 , a demodulator 104 and an AGC device 105 . Those skilled in the art can understand that the configuration of the OFDM receiver 100 described here is for illustra...

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Abstract

A method for automatic gain control used in a receiver of a multi-carrier telecommunication system, the method comprising: receiving an input signal digitalized by an A / D converter; determining distribution of the input signal; and controlling gain of a variable gain amplifier as a function of the determined distribution.

Description

technical field [0001] The present invention relates generally to methods and apparatus for automatic gain control (AGC), and more particularly to methods and apparatus for automatic gain control in multicarrier telecommunications system receivers. Background technique [0002] Recently, multicarrier modulation techniques have been widely used, such as in electronic communications, optical communications, wired communications, and wireless communications. Orthogonal Frequency Division Multiplexing (OFDM) is a typical multi-carrier modulation technique and a very promising broadband wireless communication network access scheme. OFDM has been adopted by many international standards such as DVB (Digital Video Broadcasting) and wireless LAN. OFDM is also a very promising technology for future broadband wireless communication systems such as digital TV broadcasting and fourth-generation wireless networks. [0003] In an OFDM receiver, an automatic gain control device is used to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/06
CPCH03G3/3052H03G3/3078H04B1/14H04B1/16
Inventor 张小欣李强赵玉萍邹黎王传铭
Owner THOMSON LICENSING SA
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