Method for automatically eliminating autoexcitation of wireless TD repeater

A repeater, automatic technology, applied in the direction of radio transmission system, communication between multiple stations, electrical components, etc., can solve problems such as narrowing coverage, and achieve the effect of convenient installation

Active Publication Date: 2013-06-12
SHANGHAI BEIDIAN INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the gain of the repeater is reduced, its output power will also decrease, and of course its coverage will also be reduced. Therefore, in general wireless repeater applications, the method of reducing the gain will not be used to eliminate self-excitation.

Method used

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  • Method for automatically eliminating autoexcitation of wireless TD repeater
  • Method for automatically eliminating autoexcitation of wireless TD repeater

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Embodiment Construction

[0032] The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

[0033] Such as Figure 1-2 As shown, the numbers 1-10 represent respectively: base station 1, donor antenna 2, forwarding antenna 3, power amplifier 4, intermediate frequency module 5, low noise amplifier 6, variable attenuator 7, gain detection comparison circuit 8, mobile phone 9, indicator light 10.

[0034] Also taking the repeater downlink as an example, the principle of the present invention is as follows:

[0035] Assuming that the maximum gain of the repeater is G, Sout is the maximum output power, and in the state of maximum output power, the maximum input signal is Sin, the relationship between the three is: Sout=Gsin (5)

[0036] After the wireless repeater is installed and turned on, when the repeater has the maximum ...

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Abstract

The invention relates to the field of wireless network associated equipment of a mobile communication system, in particular to a method for automatically eliminating autoexcitation of a wireless TD repeater. The method comprises that: a variable attenuator is arranged between a low-noise amplifier and an intermediate frequency module in an arbitrary link in uplink and downlink links of the repeater; the variable attenuator is connected with a gain detection comparison circuit; through setting an operation threshold in the gain detection comparison circuit, when the repeater operates, the gaindetection comparison circuit calculates actual operation gain of the repeater according to the size of output power and total input level signals of the repeater; and the actual operation gain is compared with the operation threshold, and the equipment gain of the repeater can be adjusted through controlling the variable attenuator. The method has the advantages that the autoexcitation is automatically and actively eliminated instead of eliminating by measures when the autoexcitation happened or is about to happen, so that great convenience is brought for installation of the wireless repeater.

Description

technical field [0001] The invention relates to the field of wireless network supporting equipment of a mobile communication system, in particular to a self-excited and automatic elimination method of a wireless TD repeater. Background technique [0002] as attached figure 1 As shown, the wireless repeater is a same-frequency amplifier system, and its working process is as follows: [0003] In the downlink, the donor antenna sends the received base station signal to the input terminal of the repeater, and after being amplified by the repeater, it is sent to the area to be covered by the repeater antenna. In the uplink, the forwarding antenna receives the signal sent by the mobile phone, and after being amplified by the repeater, it is forwarded to the base station by the donor antenna to complete two-way communication. [0004] The following takes the downlink of the repeater as an example to illustrate the self-excitation phenomenon of the wireless repeater. [0005] In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/155H04B7/26
Inventor 睢竹林叶建忠
Owner SHANGHAI BEIDIAN INDAL GROUP
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