Improving eciency of EMC ImmunityMonitoring of RBS using a FPGA basedinstrument

Abstract: A test system for Immunity testing of Ericsson's LTE radiobase station (RBS) was built using a National Instruments(NI) PXI chassis tted with a vector signal transceiver (VST)module and a PC controller module. A program made in Lab-VIEW and MATLAB was run on the controller module in thePXI chassis. The tasks of the program was, on one hand, tocontrol the VST which was used to record the signal emittedfrom the RBS and on the other hand, to process the signal anddetermine its quality by acquiring the bits transmitted. Functionalityenabling the VST to transmit a given signal was alsoincluded in the program. The built system performed up toninety times faster than the old system but lacked turbo decodingnecessary to correctly determine bit error ratio (BER)and block error ratio (BLER). The performance of the systemleaves room for adding time consuming processes such as turbodecoding later on and by examining the undecoded bits the signalquality can still be measured. The program handles both1tx and 2tx signals.