Measurement method of degree of isolation between antennas

Abstract

The invention provides a measurement method of a degree of isolation between antennas. The method includes the following steps: step 1, adjusting first-stage amplifying equipment and second-stage amplifying equipment between a donor antenna and a coverage antenna to the same blank working frequency; step 2, adjusting an attenuation value of an attenuator in the second-stage amplifying equipment toobtain an output signal P actually outputted by the second-stage amplifying equipment to the coverage antenna; step 3, detecting a measurement signal P2 of the donor antenna received by the first-stage amplifying equipment; and step 4, calculating the degree of spatial isolation between the donor antenna and the coverage antenna by L2=output signal P-measurement signal P2. The measurement methodof the degree of isolation between the antennas provided by the invention is at a low cost and easy to implement, and has a better accuracy degree. In a case of not increasing equipment costs, knowingof construction personnel on a current system isolation degree is facilitated, and self-excitation is prevented.

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...

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

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