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Automatic gain control device in use for multicarrier receiver

A technology of automatic gain control and receiver, applied in the direction of multi-frequency code system, etc., can solve the problems of low integration, high cost, poor linearity, etc., to achieve the effect of gain

Active Publication Date: 2005-11-16
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but figure 2 Gain control method, due to low integration, the cost is still high
In addition, VGA uses a nonlinear gain adjustment mode, which makes the linearity in the dynamic range poor

Method used

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  • Automatic gain control device in use for multicarrier receiver
  • Automatic gain control device in use for multicarrier receiver
  • Automatic gain control device in use for multicarrier receiver

Examples

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Embodiment Construction

[0023] The automatic gain control device for a multi-carrier receiver of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] image 3 A block diagram of a multi-carrier AGC receiver is shown. The multi-carrier signal received by the receiver through the radio frequency input module (31) is converted into an intermediate frequency signal by the down-conversion module (32) and sent to the VGA module (33) for corresponding gain control, and then carry out analog / digital conversion through the ADC module (34), and the converted digital signal is sent to the digital down-converter module (35), and the digital down-converter module (35) separates each carrier, and the feed-in gain of each carrier before After the module (36), it is finally sent to the baseband module (37) for processing.

[0025] Gain control of the VGA is achieved through two feedback loops. Wherein, the loop 1 is composed of VGA (33), ADC (34), digital ...

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Abstract

The device includes a radio frequency input module, down-conversion module, first loop of analog-digital composite feedback, second loop of digital feedback, feed forward loop, and base band processing module. The device possesses functions of sampling signals under high ratio of S / N by A / D converter module, extending range of variable gain amplifier, keeping power constant of multicarrier signal from receiver to output to base band under large signal dynamic range so as to meet requirement for power of each multicarrier signal by base band, root mean square detection adopted in power detection module to carry out linearization correction for non linearity of gain.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication, and in particular relates to an automatic gain control device for a multi-carrier receiver of a base station in a Code Division Multiple Access (CDMA) mobile communication system. Background technique [0002] Automatic gain control (AGC) is a very important part in the receiver, it can improve the dynamic range of the link, and keep the analog-to-digital converter (ADC) of the receiving link in a high signal-to-noise ratio working condition Downsample. At present, the automatic gain control is mainly applied to the receiving chain of a single carrier, and the integration degree is low and the cost is high. In addition, the non-linear gain adjustment mode is often used, which makes the linearity in the dynamic range poor. [0003] attached figure 1 Realize the block diagram for the traditional analog automatic gain control (AGC), the power detection part (18) detects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 林光全焦杰
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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