In wireless system, RF interferences are found any where at any time, the in band RF interference can not be filter out and will cause noise rise to receiver system which will degrade the receiver sensitivity. To accurately test the system capability such as data rate or throughput, it is required and important to find the exact RF interference signal power level and find its impact on receiver sensitivity.This article discusses the basic Method of Procedure on how to find the RF interference signal power level even if it is lower than the noise floor of the Vector Signal Transceiver (VST). We configure the Vector Signal Generator (VSG) to create a RF signal for emulating RF interference signal, and loop it back to Vector Signal Analyzer (VSA). Refer to below for block diagram, consider PXIe-5841 as an example:The procedure of measuring RF interference signal power level is summarized as below:
Record the VSA noise floor with a 50Ω dummy load connected to RF input port
Record the displayed total channel power include noise power and interference power
Calculate the interference signal power with this formula CPinterf_measured = 10 x Log (10（CPSA_display/ 10） - 10（CPSA_noise/ 10） )
Where,CPinterf_measured is the measured Interference Channel powerCPSA_display is the displayed signal analyzer (SA) Channel powerCPSA_noise is the signal analyzer (SA) Noise floor
The intended audiences are NI-VST users who have good knowledge of RF interference, and familiar with NI tools such as RFmx, RFSA, RFSG.
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