Automatic gain control device and method for mobile communication terminal

An automatic gain control and mobile communication terminal technology, applied in the field of automatic gain control devices, can solve problems such as long automatic gain delay, and achieve the effects of reducing calculation burden, shortening delay, and improving demodulation effect

Active Publication Date: 2005-12-07
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0035] The purpose of the present invention is to provide an automatic gain control device and method for a mobi

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  • Automatic gain control device and method for mobile communication terminal
  • Automatic gain control device and method for mobile communication terminal
  • Automatic gain control device and method for mobile communication terminal

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Embodiment Construction

[0064] The automatic gain control device and method of the present invention are not only applicable to the terminal subsystem of TD-SCDMA, but also applicable to the terminal subsystems of other wireless communication systems.

[0065] Hereinafter, the present invention will be specifically described by taking the receiver of the TD-SCDMA communication system as an example.

[0066] see Figure 5 , Figure 5 It is a schematic diagram of the receiving principle of a receiver using the automatic gain control device of the present invention. The receiver includes a receiving path 2 for demodulating received radio frequency signals into digital signals and an automatic gain control device 3 connected to the receiving path 2 . in:

[0067] The receiving path 2 includes: LNA12, I / Q demodulation unit 17, PA18, low-pass filter 19, ADC20, FIR filter 22, DSP21. The radio frequency signal RF is first amplified by LNA12, and then quadrature demodulated by I / Q demodulation unit 17 int...

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Abstract

This invention discloses a automatic gain controller and method for mobile communication terminal containing r4eceiving circuit for demodulating received RF signal to digital signal, which contains signal average power calculator for intercepting the code chip value of I and Q signal of receiving circuit and calculating signal average power in gain adjustment period, gain parameter calculator connected to signal average power calculator for comparing signal average power with preset threshold value and obtaining receiving gain parameter in next period, selector connected to gain coefficient calculator fro selecting control parameter corresponded by said gain coefficient from gain mapper, D/A converter for complete signal gain control according to said control parameter adjusting gain.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an automatic gain control device and method for a mobile communication terminal. Background technique [0002] The process of using a control signal to adjust the gain of a received signal in a mobile communication terminal is called automatic gain control (AGC). AGC generally estimates the strength of the next signal according to the strength of the received signal, and adjusts the receiving gain coefficient to make the received signal meet the required requirements, so as to improve the receiving effect. [0003] In the TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system, the range of the signal received by the receiver should be guaranteed to be within the dynamic range of 80dB (-105dB--25dB), in addition to ensuring the overall In addition to the dynamic range, the receiver also needs to provide sufficient instantaneous dynamic range to adapt t...

Claims

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Application Information

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IPC IPC(8): H04B1/12
Inventor 程履帮
Owner DATANG MOBILE COMM EQUIP CO LTD
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