Air OTA performance test system for out-of-band useless transmission indexes of wireless equipment

Abstract

The invention provides an air OTA performance test system for out-of-band useless emission indexes of a wireless device. The system comprises a darkroom, a rotary table, a detected wireless device, asignal detection assembly, a spectrum analyzer and a control device, and the path loss of the darkroom is lower than the difference value between the required value of the out-of-band useless emissionindex of the detected wireless device and the bottom noise value of the spectrum analyzer. According to the invention, the darkroom with a specific path loss value is used as a test site; a single signal detection assembly is used as a probe to be matched with a rotary table capable of rotating horizontally and vertically to carry out near-field test on out-of-band useless emission indexes of tested wireless equipment; according to the invention, the overall offset compensation value of the field path loss and the cable loss on the spectrum analyzer can be effectively ensured to be small enough, so that the bottom noise of the whole test system can be effectively controlled, a stable and good out-of-band useless emission index test result can be obtained, and the index requirements of tested wireless equipment can be met. The test system is small in occupied area and low in cost.

Description

Technical field [0001] The invention relates to the technical field of wireless equipment testing, in particular to an over-the-air OTA performance test system for out-of-band useless emission indicators of wireless equipment. Background technique [0002] At present, although some recommendations have been given in the relevant international and domestic standards on the out-of-band unwanted emission OTA (Over the Air) test method of wireless devices (such as 5G base stations), there is no detailed test yet. Description of the method. Due to the increasing shortage of frequency resources, in order to avoid mutual interference between different systems, the National Radio Administration has put forward very strict out-of-band unwanted emission OTA test indicators for wireless transmission equipment (especially 5G base stations below 6GHz), but it has not targeted This rigorous indicator gives clear recommendations for methods that facilitate the passing of the test. [0003] In t...

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Problems solved by technology

[0003] In the prior art, the out-of-band unwanted emission indicators measured by ordinary methods usually cannot truly reflect the actual out-of-band unwanted emission level of the wireless device under test

For example, suppose the standard requires that the out-of-band unwanted emission index of the wireless device under test cannot be greater than -40dBm / MHz. Out-of-band unwanted emission index results may be -10dBm / MHz, -38dBm / MHz, -47dBm / MHz, etc., which cannot reflect the real level of the tested wireless device, and even cause the tested wireless device to fail to pass the standard out-of-band unwanted emission Specification limit requirements, hindering the application of the wireless device under test

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