Method for detecting isolation between antennas for digital radio repeater system

Abstract

The invention provides a method for detecting isolation between antennas for a digital radio repeater system, which comprises the following steps that: a downlink digital processing unit (103) automatically utilizes an idle channel to search idle frequency points; an FPGA (1034) of the downlink digital processing unit (103) produces a dot frequency signal X; the X is transformed into an analog intermediate-frequency signal through DUC digital upconversion and D / A conversion; the analog intermediate-frequency signal enters the downlink digital processing unit (103) through a downlink upconversion module (104), an AMP (105), a duplexer (302), a retransmission antenna (402), a donor antenna (401), a duplexer (301), an LNA (101), and a down-conversion module (102); and the analog intermediate-frequency signal is transformed into a digital baseband signal Y through A / D conversion and DDC, the Y is equal to X+G-IL, G is system gain, and IL is the isolation between the donor antenna (401) and the retransmission antenna (402).

Description

technical field [0001] The invention relates to the field of digital wireless repeater system design, in particular to an antenna isolation detection method of the digital wireless repeater system. Background technique [0002] With the rapid growth of mobile communication services, operators have an urgent need to enhance their respective brand effects, and the corresponding network quality requirements are also increasing. Now various underground residences, villages, roads, railways, and other construction projects are in full swing. As an effective means of extending network coverage, wireless repeaters (including digital wireless repeaters and analog wireless repeaters) have unlimited potential. Such as figure 1 As shown, a general digital wireless repeater system may (but not limited to) include: an uplink, a downlink; the downlink consists of a duplexer (301), a low noise amplifier LNA (101), a Module (102), digital processing unit (103), up-conversion module (104)...

AI Technical Summary

Problems solved by technology

[0005] There are generally three methods for testing the isolation of wireless repeaters: image 3 As shown, one is to connect a signal source and a spectrum analyzer at both ends of the donor antenna and the retransmission antenna to test the antenna isolation, but this is generally used when the station is opened or when the engineering personnel arrives at the site. One method, but because the signal source and the spectrum analyzer are relatively expensive and inconvenient to move equipment, so this brings some difficulties to the isolation test of the wireless repeater; another method is to bring a The signal source and a spectrum analyzer are used to test the isolation degree, which will undoubtedly increase the cost of the equipment and cause signal interference; the third method is to achieve the detection of the antenna isolation degree through radio frequency detection, signal synthesis, and adding control circuits, but this method It will increase the cost, and the detection accuracy is not high

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