Automatic gain control apparatus and method in wireless telecommunication system based on time division duplex

A wireless communication system, gain control technology, applied in the direction of gain control, amplification control, transmission system, etc.

Inactive Publication Date: 2009-02-25
POS DATA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the automatic gain control technique according to the prior art described above works only during the time slot associated with the relevant pair of transmitters / receivers out of the total time slots associated with multiple pairs of transmitter / receivers (serial number is 10-2003-7013895), or a scheme corresponding to detecting the power level by utilizing a preamble using the BPSK format (patent application serial number 10-2003-7013864)
Therefore, there is no technique to distinguish between downlink (DL) frames and uplink (UL) frames and perform automatic gain control separately only during frame reception

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  • Automatic gain control apparatus and method in wireless telecommunication system based on time division duplex
  • Automatic gain control apparatus and method in wireless telecommunication system based on time division duplex
  • Automatic gain control apparatus and method in wireless telecommunication system based on time division duplex

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Embodiment Construction

[0029] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Well-known functions and constructions are not described in detail since they might obscure the invention in unnecessary detail.

[0030] First, refer to Figure 4, concisely describes the structure of a frame in a wireless communication system using the TDD scheme. The TDD scheme uses one frame which is divided into one subframe for transmission and another subframe for reception in the time division transmission scheme. Such as Figure 4 As shown, in the TDD scheme, one frame is divided into a DL frame 410 and a UL frame 420, and full-duplex communication is performed using the same frequency. A frame includes multiple samples, such as Figure 4 As shown, a frame consists of N frm samples, where the DL frame 410 consists of N DL samples, the UL frame 420 consists of N UL composed of samples. In addition, there is a transmission / r...

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Abstract

Disclosed is an apparatus and a method for controlling automatic gain in a wireless communication system using a Time Division Duplex (TDD) scheme. The apparatus comprises an power detecting unit for detecting a power of a TDD frame signal on a receive path; an Automatic Gain Control (AGC) synchronizing signal generating unit for generating an AGC synchronizing signal enabled or disabled either during a Down Link (DL) frame or during an Up Link (UL) frame of a TDD frame; an automatic gain calculating unit for calculating a gain control value based on the power detected by the power detecting unit either during the DL frame or during the UL frame of the TDD frame in response to the AGC synchronizing signal; and an AGC unit for performing gain control for the TDD frame signal on the receive path on the basis of the calculated gain control value. Hence, as AGC is performed during only an actual receive frame, the optimized demodulation performance can be maintained.

Description

technical field [0001] The present invention relates to an apparatus and method for controlling automatic gain in a wireless communication system using a time division duplex (TDD) scheme, and more particularly, to a method for controlling automatic gain in a wireless communication system using a TDD scheme The apparatus and method, although the power of the transmitter varies within the communication coverage, it can also maintain the signal strength by measuring the signal strength on the receiving path and controlling the gain of the signal in the Wireless Broadband Internet (WiBro) using the TDD scheme. Stable demodulation performance. Background technique [0002] In a communication system, automatic gain control (AGC) technology on the receiving path is one of the core technologies to control the performance of receiving demodulation. Such as figure 1 As shown, the signal level received by the receiver may vary with the power of the transmitter (in particular, the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/14
CPCH03G3/3078E01D2/02E01D2101/285
Inventor 李文圭尹彰培
Owner POS DATA CO LTD
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