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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

Active Publication Date: 2018-12-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the defect that the existing passive intermodulation test device is only for single-frequency signal measurement and has a single test signal, and cannot test the influence of intermodulation interference signals on the bit error rate and frame error rate of the communication receiver at the same time, the present invention proposes A testing device and testing method for passive intermodulation of modulated signals

Method used

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

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Embodiment 1

[0058] figure 1 The upper part is a schematic structural diagram of the device and a schematic diagram of the device in this embodiment. from figure 1 In the upper half, it can be seen that the device includes:

[0059] The control module is composed of an input unit and an output unit, the input unit is used to set the frequency, power, modulation mode and bandwidth of the test signal and the transmission mode, and the output unit is used to display the processing results output by the processing module;

[0060] The signal generation module is composed of a test signal generation unit and a PIM signal acquisition unit, the test signal generation unit is used to generate corresponding test signals according to the parameters set by the input unit, and the PIM signal acquisition unit is used to obtain transmission PIM signals and reflection PIM signals;

[0061] The data transceiver module is composed of a sending unit and a receiving unit. The sending unit is used to select...

Embodiment 2

[0094] The test device provided in this embodiment is mainly a device for testing the passive intermodulation signal of the modulated signal passing through the passive device, which can realize transmission PIM test and reflection PIM test.

[0095] figure 2 It is a schematic structural diagram of the test device in this embodiment. It can be seen from the figure that the test device for passive intermodulation of modulated signals includes a control module, a signal generation module and a processing module;

[0096] Wherein, the control module includes an input unit and an output unit; the input unit is a liquid crystal touch display screen, and the output unit is a spectrum analyzer;

[0097] Described signal generation module comprises test signal generation unit and PIM signal acquisition unit; Test signal generation unit is made up of signal source, power amplifier and combiner 1, and PIM signal acquisition unit is made up of duplexer 1, duplexer 2 and load ;

[0098...

Embodiment 3

[0115] The test device provided in Embodiment 3 can observe the influence of the passive intermodulation interference signal on the bit error rate and frame error rate of the communication receiver. The technical details of the present invention will be further described below.

[0116] image 3 It is a schematic structural diagram of the test device in this embodiment. It can be seen from the figure that the test device for passive intermodulation of modulated signals includes a control module, a signal generation module, a data transceiver module and a processing module;

[0117] Wherein, the control module is a liquid crystal touch display screen, including an input unit and an output unit;

[0118] Described signal generation module comprises test signal generation unit and PIM signal acquisition unit; Test signal generation unit is made up of signal source, power amplifier and combiner 1, and PIM signal acquisition unit is made up of duplexer 1;

[0119] Wherein, the sig...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/15H04B17/29
CPCH04B17/15H04B17/29
Inventor 徐昂杨凯孙灿灿安建平卜祥元田露
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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