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Automatic gain control method and its apparatus for time-division duplex radio communication system

A technology of automatic gain control, wireless communication system, applied in wireless communication, time division multiplexing system, transmission control/equalization, etc., can solve problems such as inability to obtain synchronization correctly, detector error detection position, etc., to overcome the impact , the effect of occupying less resources and loose timing control

Inactive Publication Date: 2008-01-09
XUANPU INDUSTRY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gain is not suitable for the downlink synchronization signal to be detected, so that the detector detects the wrong position and cannot obtain synchronization correctly

Method used

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  • Automatic gain control method and its apparatus for time-division duplex radio communication system
  • Automatic gain control method and its apparatus for time-division duplex radio communication system
  • Automatic gain control method and its apparatus for time-division duplex radio communication system

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Embodiment Construction

[0062] A preferred embodiment of the present invention will be described below by taking a TD-SCDMA system (Time Division-Synchronous Code Division Multiple Access system) as an example according to FIG. 3 to FIG. 8 .

[0063] As shown in Figure 3, it is a block flow diagram of the inventive method; the automatic gain control method of a kind of time division duplex wireless communication system provided by the present invention, it comprises the following steps:

[0064] 1. After the start, the user terminal judges whether frame synchronization has been obtained;

[0065] 2. If the frame synchronization is not obtained, the user terminal selects a working frequency point for the received first wireless signal of a frame length, and obtains a suitable initial gain on the frequency point, and proceeds to step 3; if the frame has been obtained synchronization, go directly to step 5;

[0066] 3. On the basis of the initial gain, by calculating the power level change of a second ...

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Abstract

The present invention is AGC method and device for the terminal equipment in time division duplex radio communication system. The AGC method includes the following steps: judging whether to reach frame sync; if not, selecting one work frequency for the first radio signal of one frame length the user terminal receives to obtain proper initial gain; calculating the power level variation of the second received radio signal in one frame time to obtain the power envelope of the signal; distinguishing the power envelope to obtain the first sectional message; after obtaining the frame sync, generating the second sectional message with the user terminal based on the specific frame structure of TDD system; and performing the time-dividing AGC to the first radio signal based on the first sectional message or the second sectional message. The present invention makes it possible for the communication system to establish normal sync and communication.

Description

technical field [0001] The present invention relates to an automatic gain control (Automatic Gain Control, AGC) method and device thereof used in a Time Division Duplex (Time Division Duplex, TDD) wireless communication system. Background technique [0002] In a wireless communication system, the fading, shadowing, multipath effect of the wireless communication channel, and various other factors will cause the amplitude and power of the received signal to change, and this change is extremely unstable and has a large dynamic range. [0003] For the received signal with a large dynamic range due to the above reasons, it can generally be processed in the following two ways: one is to increase the word length of the Analog to Digital Converter (ADC), thereby expanding the dynamic range of the ADC to ensure The processing loss of large signal and small signal does not exceed a certain level; the second is to reduce the large signal to or amplify the small signal to an appropriate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/32H04Q7/20H04B7/26H04B7/005H04J3/06H04W52/52H04W56/00
Inventor 王海涛冉晓龙谢一宁刘栋
Owner XUANPU INDUSTRY CO LTD
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