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A method for measuring the isolation between antennas

A measurement method and technology of antenna spacing, applied in measurement devices, measurement of electrical variables, transmission monitoring, etc., can solve the problems of inability to accurately obtain isolation, inability to large-scale commercial use, and hidden dangers caused by strong self-excitation, and achieve improvement. The effect of customer satisfaction, improving user experience, and enhancing system stability

Active Publication Date: 2021-09-24
XIAN SAIERCOM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent self-excitation of the system, the isolation between antennas is usually roughly estimated according to the space loss model during engineering installation, but the external environment, multipath reflection, antenna directivity and other factors make it impossible to accurately obtain the isolation. Bring trouble to construction
Or the system is in weak self-excitation (critical self-excitation), which will lay hidden dangers for strong self-excitation that may occur during long-term network operation in the future during installation and commissioning
One method is to use ICS (adaptive interference cancellation) technology, which can improve the stability of the system, but this method is very expensive and cannot be commercialized on a large scale

Method used

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  • A method for measuring the isolation between antennas
  • A method for measuring the isolation between antennas
  • A method for measuring the isolation between antennas

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Embodiment 1

[0037] In order to prevent self-excitation of the system, the isolation between antennas is usually roughly estimated according to the space loss model during engineering installation, but the external environment, multipath reflection, antenna directivity and other factors make it impossible to accurately obtain the isolation. Bring trouble to engineering construction. Or the system is in weak self-excitation (critical self-excitation), which may cause strong self-excitation during installation and commissioning, which may cause strong self-excitation during long-term network operation in the future. One method is to use ICS (adaptive interference cancellation) technology, which can improve the stability of the system, but this method is very expensive and cannot be commercialized on a large scale.

[0038] The method proposed in this embodiment is cheap and easy to implement, and has good accuracy. Without increasing the cost of equipment, it provides a measurement data of ...

Embodiment 2

[0046] On the basis of Embodiment 1, this embodiment discloses a specific method for measuring the isolation between antennas.

[0047] The wireless coupling indoor coverage system consists of a donor antenna, a first-stage amplification device MU, a radio frequency feeder, a second-stage amplification device RU and a coverage antenna. Ideally, all the RF signals output by the coverage antenna will cover the area to be covered, but in reality, some signals will be fed back to the donor antenna from the space, so a feedback loop is introduced into the system, which is inevitable in actual engineering of.

[0048] The condition that the whole system is not self-excited is that the sum of the gains is less than the sum of the attenuations, and a 15dB margin is left. Therefore, spatial isolation between antennas is required (unit: dB)

[0049] L2 > G1 + G2 - L1 + 15

[0050] Among them: G1 and G2 are the working parameters of the equipment, which can be read directly; L1 is the...

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Abstract

The invention provides a method for measuring the isolation between antennas, comprising the following steps: step 1, adjusting the first-stage amplification device and the second-stage amplification device between the donor antenna and the coverage antenna to the same blank working frequency; step Two, adjust the attenuation value of the attenuator in the second-stage amplifying device, and obtain the output signal P that the second-stage amplifying device actually outputs to the coverage antenna; Step three, detect that the first-stage amplifying device receives the measurement signal P2 of the donor antenna; step 4. Spatial isolation L2 between the donor antenna and the coverage antenna = output signal P - measurement signal P2. The method for measuring the isolation between antennas proposed by the invention is cheap and easy to implement, and has better accuracy. Without increasing equipment costs, it is convenient for construction personnel to know the current system isolation and prevent self-excitation.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for measuring the isolation between antennas. Background technique [0002] With the deepening popularization of mobile communication services, users have higher requirements on the quality of mobile communication signals. In many scenarios, wireless signals cannot be directly reached due to the obstruction of buildings, so a large number of mobile communication indoor coverage devices are required. The main principle of this device is to use direct coupling or wireless methods to obtain base station signals, and through the first-stage amplification equipment (called MU) and feeder cable transmission, the wireless signals are introduced into places where mobile communication signals are weak, such as basements and tall buildings. Blocking areas, etc., because the loss of the feeder cable is usually relatively large, at this time the system uses the second-stage ampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/10G01R29/00
CPCG01R29/00H04B17/102H04B17/103
Inventor 王德强岳冰曾抓纲
Owner XIAN SAIERCOM CO LTD