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

A technology of automatic gain control and wireless communication system, which is applied in wireless communication, time division multiplexing system, transmission control/equalization, etc. It can solve the problems of wrong detection position of the detector and failure to obtain synchronization correctly, so as to overcome the influence , Occupies less resources and is easy to achieve

Inactive Publication Date: 2005-02-09
XUANPU INDUSTRY CO LTD
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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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Experimental program
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Embodiment Construction

[0060] The following is based on Figure 3 ~ Figure 8 Take a TD-SCDMA system (time division-synchronous code division multiple access system) as an example to illustrate a preferred embodiment of the present invention.

[0061] Such as image 3 Shown is a flowchart of the method of the present invention; an automatic gain control method for a time division duplex wireless communication system provided by the present invention includes the following steps:

[0062] 1. After the start, the user terminal judges whether the frame synchronization has been obtained;

[0063] 2. If the frame synchronization is not obtained, the user terminal selects a working frequency for the received first wireless signal of a frame length, and obtains an appropriate initial gain at this frequency; if it has been obtained, it will go directly to Step 5;

[0064] 3. On the basis of the initial gain, obtain the power envelope of the signal by calculating the power level change of a received second wireles...

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PUM

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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 invention relates to an automatic gain control (AGC) method and device used in a time division duplex (TDD) wireless communication system. Background technique [0002] In a wireless communication system, the fading, shadow, multipath effect, and other various factors of the wireless communication channel 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 caused by 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 and small signals does not exceed a certain level; the second is to reduce the large signal to or amplify the small signal to an appropriate level by adjusting the receiving gain. This technique of automatically a...

Claims

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Application Information

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