Specific lookup table based digital automatic gain control device

A technology of automatic gain control and gain control signal, which is applied in the direction of remote control amplification, color TV parts, TV system parts, etc. It can solve the problems of high computational complexity and slow response speed, and achieve low computational complexity , high loop stability, eliminating the effect of logarithmic and antilogarithmic operations

Inactive Publication Date: 2008-05-14
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

This method requires logarithmic operations, has high computational c...

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  • Specific lookup table based digital automatic gain control device
  • Specific lookup table based digital automatic gain control device
  • Specific lookup table based digital automatic gain control device

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Embodiment Construction

[0015] A digital automatic gain control device based on a specific look-up table of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] figure 1 A block diagram of an AGC receiver based on a specific look-up table is shown. The wireless signal received by the receiver through the antenna module 11 is selected by the frequency selection filter 12. The useful signal is sent to the VGA module 13 for corresponding gain control, and then through the following The frequency converter 14 switches to intermediate frequency or zero intermediate frequency. The ADC module 15 performs analog / digital conversion, and the converted digital signal is sent to the baseband module 16 for processing.

[0017] The gain control of VGA is realized through AGC feedback loop. The AGC loop is composed of VGA13, down-converter 14, ADC15, amplitude detection module 17, loop filter 18, look-up table 19, and DAC10. First, the detector detects t...

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Abstract

The invention discloses a digital automatic gain control device based on a specific look-up table, which includes: an antenna (11), a band-pass filter (12), a variable gain amplifier (13), a down-conversion mixer (14), an analog-to-digital converter (15), a baseband module (16) and a DAC (10), an amplitude detector (17) which performs amplitude detection for N received sample points by use of a domain average method, a look-up table (18) which compares detection results and a reference level and gets the error between the two, and a loop filter (19) which obtains series numbers of corresponding gain control signals by series number of error signals, takes the series number of the gain control signals as indexes and inputs into the look-up table to control VGA gains after obtaining the series number of the gain control signals through the DAC feedback. The invention can be used widely in receivers for manifold systems. The AGC feedback control loop of the invention has the same rapid response with the feed forward control loop at the starting phase; and a slow loop filter based on the look-up table is adopted at the AGC tracking stage, thus ensuring high stability of the loop.

Description

technical field [0001] The invention belongs to the technical field of digital broadcasting, in particular to an automatic gain control device for receivers in digital radio broadcasting (DRM) and digital television (DTV) broadcasting systems. Background technique [0002] In a communication system, due to various reasons, the signal power input by the receiver often varies in a large range, and the power of a large signal and a small signal usually differ by dozens of dB. The receiver needs to be able to design requirements in the case of receiving large signals and receiving small signals. [0003] There are many factors that affect the input signal power of the receiver, which are related to the power of the signal transmitted by the transmitter and the distance of the receiver, and are also affected by the channel environment. [0004] Automatic gain control (AGC) is a very important part in the receiver, it can improve the dynamic range of the receiver, so that the ana...

Claims

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Application Information

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IPC IPC(8): H04B1/06H03G1/02H04N5/44H04N21/41H04N21/418
Inventor 焦杰朴范镇魏立军
Owner BEIJING SAMSUNG TELECOM R&D CENT
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