Device and method for realizing elimination of self-excitation interference of repeater

A technology of self-excitation elimination and interference elimination, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problems of high engineering additional cost, application occasions and construction difficulties, reduce requirements, increase gain, and expand coverage. range effect

Active Publication Date: 2010-02-24
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0003] To sum up, the wireless repeater using the traditional method has insurmountable difficulties in application and construction, and usually the additional cost of the project is relatively high

Method used

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  • Device and method for realizing elimination of self-excitation interference of repeater
  • Device and method for realizing elimination of self-excitation interference of repeater

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Embodiment Construction

[0023] The implementation process of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] see figure 1 , the feature of the device that the present invention realizes repeater self-excited interference elimination is: the radio frequency signal that repeater receives becomes intermediate frequency analog signal through front-end analog radio frequency device (low noise amplifier and frequency mixing unit), and intermediate frequency analog signal passes modulus The conversion unit (ADC) and the digital down-conversion unit (DDC) are converted into a digital baseband signal, and the digital baseband signal enters the self-excited cancellation processing unit, and the reference signal (sampling of the output signal) of the interference signal is filtered with a complex coefficient of a certain length, An estimated signal of the interfering signal is obtained. The received digital baseband signal subtracts the estimated si...

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Abstract

The invention relates to a device for realizing the elimination of the self-excitation interference of a repeater, characterized in that the device comprises a low-noise amplification unit, a radio frequency-to-intermediate frequency analog mixing unit, an analog-to-digital conversion unit, a digital down-conversion unit, an automatic level control unit, a self-excitation elimination processing unit, a digital up-conversion unit, an automatic gain control unit, a digital-to-analog conversion unit and an intermediate frequency-to-radio frequency analog mixing unit; the invention further provides a method for realizing the elimination of the self-excitation interference of a repeater. By utilizing the digital signal processing technique and the software radio principle, the device and the method can greatly reduce the isolation required by the installation of wireless repeater projects to increase the gain of the repeater and widen the coverage of the wireless repeater.

Description

technical field [0001] The present invention relates to a device and method for eliminating self-excited interference of a repeater, in particular to a device for eliminating the interference from a repeater retransmission antenna fed back to a donor antenna and preventing the repeater from self-excitation. Background technique [0002] As the basic product of the repeater, the wireless repeater has been used for many years, and its main advantage is its low price. However, the wireless repeater has the problem that the equipment is easy to self-excite due to unreasonable engineering installation. This problem has extremely high requirements for the installation of the repeater. . Under normal engineering application conditions, the gain margin GM (isolation-gain) is required to be at least 15dB. Traditional wireless repeaters usually can only be solved by using physical methods to increase isolation, increasing the distance between antennas, using isolation nets, and reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/155H04B1/10
Inventor 刘永飘黄涛蔡清郑伟
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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