Passive intermodulation testing method of mobile communication base station system

Abstract

This invention relates to test to the passive intermodulation performance of the communication system, which controls an emitter to emit test signals according to a preset mode, controls a receiver to scan and receive the signals in the test bands and analyze spectrums of the received signals to evaluate the entire passive intermodulation performance of the base station, in which, the original outside interference signals are received at the shut-off state of the emitter to eliminate its influence and measure the performance accurately and the received test bands are computed accurately by the known carrier frequency sphere, intermodulation stages and the received frequency sphere parameters and the test signal receiving quality is increased by scanning the emitted and received continuouswaves.

Description

technical field [0001] The invention relates to the passive intermodulation performance test of a communication system, in particular to the passive intermodulation performance test of a mobile communication base station system. Background technique [0002] In wireless communication, various system noises and external interference have a great impact on wireless signals and communication quality. Therefore, in the design and installation process of wireless communication systems, it is necessary to test and evaluate the anti-interference performance of the system, and even in the operation and maintenance process, it is necessary to carry out frequent tests to determine the degree of degradation of system performance due to factors such as component aging and environmental impact. Therefore, corresponding measures are taken for maintenance, so as to achieve the purpose of maintaining the service quality of the wireless communication system. It can be seen that system perfo...

AI Technical Summary

Problems solved by technology

The individual components cannot be tested once they have been assembled into an overall base station system

However, the degradation of passive intermodulation performance due to problems such as installation environment or component aging will not be able to be monitored and maintained, seriously affecting the normal operation and maintenance of the base station

[0009] In practical application, the above solution has the following problems: After each component of the base station passes the passive intermodulation performance test, it cannot guarantee that the entire base station system can meet the PIM index after installation

[0010] In fact, due to various factors in the assembly and coordination process of components, the passive intermodulation performance of the base station will still be reduced

For example, poor connection between components caused by poor installation during the installation process will equivalently introduce new intermodulation factors; or electromagnetic compatibility problems between different components; or changes in the carrier wave and receiving frequency band settings of the base station, resulting in PIM Changes in the scope of influence; or differences in the external environment cause further degradation of component performance; more commonly, due to the aging of components and loose structures after the base station system has been working for a period of time, the performance of passive intermodulation will decline

[0011] All of the above situations cannot be guaranteed by separate testing of components before installation, nor can it be resolved by disassembling components for separate testing

Only through passive intermodulation performance testing of the base station system as a whole, the performance changes of the base station system can be monitored in daily maintenance, which is a technical problem that cannot be solved by existing technologies

[0012] The main reason for this situation is that the existing technical solutions are only limited to individual testing of each component, and cannot conduct overall testing on the entire base station system

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