System, method and multiplexer for testing radio frequency for base station

Abstract

The invention provides a system, a method and a multiplexer for testing radio frequency for a base station. The multiplexer comprises a first port, a first combiner, at least a second port, at least a third port, a band-pass filter and a band elimination filter. The first port is connected with a radio frequency port to be tested of the base station, the first combiner is connected with the first port, the second port is connected with a frequency spectrum analyzer, and the third port is connected with a signal generator. The band-pass filter is connected between the first combiner and the second port, and a passing band of the band-pass filter is a downlink radio frequency signal frequency range of the base station. The band elimination filter is connected between the first combiner and the third port, and a stop band is a downlink radio frequency signal frequency range of the base station. The system, the method and the multiplexer can improve accuracy of testing efficiency and testing results and reduce testing cost.

Description

technical field [0001] The invention relates to wireless communication equipment testing technology, in particular to a radio frequency testing system, method and multiplexer of a Frequency Division Duplex Long Term Evolution (FDD LTE) base station. Background technique [0002] The evolved remote radio unit (eRRU) in the LTE base station is an indispensable part of the wireless communication system. Its performance affects the entire system. It needs to be tested to verify whether its radio frequency performance has reached the design goal. [0003] The actual deployment scenario of eRRU is as follows: figure 1 as shown, figure 1 Among them, ANT is an antenna, UE is a user equipment, EPC is an evolved packet core network, and OMC is an operation and maintenance center. When the eRRU is actually deployed in the field, the eRRU is directly connected to the antenna through the feeder. Since the passive intermodulation between the antenna and the RF feeder is usually below -1...

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Problems solved by technology

[0004] The laboratory test environment such as figure 2 As shown, in the laboratory test, since the output power of each antenna feed port (that is, the radio frequency port) of the eRRU is greater than 20W, many test accessories are often used, such as attenuators, circulators, isolators and traps. However, the passive intermodulation of ferrite devices such as circulators and isolators is very poor, and the intermodulation products are very large under high power, which has a great impact on the test of eRRU, and the test environment can no longer truly reflect the eRRU. actual performance

[0005] In addition, in the above test environment, the uplink radio frequency index (receiver radio frequency index) and downlink radio frequency index (transmitter radio frequency index) are time-sharing tests, and the efficiency is relatively low

[0006] Moreover, the current RF test environment of FDD LTE uses discrete devices, the connection is complex, the cost of building a test environment is high, and intermodulation and electromagnetic spurs are easily generated at the connection, which has a great impact on the test results.

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