A testing device and testing method for passive intermodulation of modulated signals

A passive intermodulation and signal modulation technology, which is applied in receiver monitoring, transmitter monitoring, etc., can solve the problems that the influence of bit error rate and frame error rate cannot be tested at the same time, and the test signal is single, so as to reduce the complexity of testing , Simplify the test process and avoid the effect of time overhead
CN106301607BActive Publication Date: 2018-12-14BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2018-12-14

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Abstract

A test device and a test method for passive intermodulation (PIM) of a modulated signal include a test device for PIM of a modulated signal (referred to as the device) and a test method for PIM of a modulated signal (referred to as the method). The device comprises a control module, a signal generating module, a data transmitting-receiving module and a processing module. A mode one of the method is as follows: firstly, a test signal parameter and a mode one are configured; secondly, test signals of different frequencies are generated; thirdly, transmission PIM testing or reflection PIM testing is selected; and fourthly, a transmission PIM signal or a reflection PIM signal is tested. A mode two is as follows: firstly, a test signal parameter and a mode two are configured; secondly, test signals of different frequencies are generated, and a useful signal is transmitted; thirdly, the useful signal and a PIM interference signal are received, down conversion and low-pass filtering processing are carried out, the test signal frequency and bandwidth are set, and a to-be-tested PIM order is determined; and fourthly, the processing module calculates two indices, the bit error rate and the frame error rate, for evaluation, and sends obtained data information to an output unit.
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Description

technical field

[0001] The invention relates to a testing device and a testing method for passive intermodulation of modulated signals, belonging to the technical field of passive intermodulation testing. Background technique

[0002] The so-called passive intermodulation (Passive Inter-Modulation, referred to as "PIM") refers to the additional interference to the system caused by the mutual modulation of multiple carrier signals of different frequencies in the system through the mixing effect of the passive components of the system. Passive intermodulation in wireless communication systems is caused by the non-linear characteristics of various passive components (such as duplexers, antennas, feeders, radio frequency connectors, etc.) in the transmission system. If these intermodulation distortion signals fall into the receiving frequency band, and the power exceeds the minimum amplitude of the useful signal in the system, the signal-to-noise ratio of the receiving signal wi...

Claims

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