R&S®DST200 RF diagnostic chamber for automated OTA and RSE ...

WIRELESS TECHNOLOGIES | Test cellsExcellent correlation of results between theR&S®DST200 and larger OTA test chambersFig. 6 reveals statistical performance, showing the cumulativedistribution functions (CDF) for the results obtained with threedifferent test chambers. The EUT was operated in LTE MIMOtransmit diversity mode, and receiver sensitivity was measuredwith the EUT set to six spatial orientations. The measurementsmade with the R&S®DST200 RF diagnostic chamberwere repeated in order to verify reproducibility of resultsobtained with the test chamber.The best statistical sensitivity was obtained with the OTA­reference test chamber (5 m × 5 m × 5 m), with 50 % ofall antenna constellations yielding at least 90 % of themaximum data throughput at a downlink power density ofP iso≈ –127 dBm/15 kHz referenced to an ideal isotropic radiator.The R&S®R-Line compact test chamber (1.7 m × 1.6 m ×2.2 m) and the R&S®DST200 delivered sensitivity 1 dB and2 dB lower, respectively, for the same test parameters. Themeasurements also exhibited a high level of reproducibilityfor the tests performed with the R&S®DST200, with resultingCDF graphs differing by no more than 0.5 dB.SummaryThe R&S®DST200 RF diagnostic chamber together with itsnew options enables a wide range of automated OTA andRSE test capabilities, while offering the most compact sizeon the market. The R&S®DST-B160 automated 3D positionerand the test equipment are controlled using the R&S®AMS32and R&S®EMC32 measurement software. Results are generatedin the same way as with large OTA or EMC test chambers.These features combine to open up new applications inR&D and quality assurance in production and subsequent servicingby network operators. Rohde&Schwarz will continueto create new options and add-ons to make the R&S®DST200even more flexible.Erwin Böhler; Adam TankielunThe article starting on page 12 discusses typical RSE measurementson LTE wireless devices during development usingthe R&S®DST200 RF diagnostic chamber.Result correlation for three test chambersCDF in %1009080706050403020100–130 –128 –126 –124 –122 –120 –118 –116P iso[dBm/15 kHz]OTA referencetest chamberOTA referencetest chamber¸R-Line¸DST 200 #1¸DST 200 #1¸R-Line ¸DST 200Abbreviations3GPP 3rd Generation Partnership ProjectA-GPS Assisted global positioning systemCDF Cumulative distribution functionCTIA Cellular Telecommunications Industry AssociationDL DownlinkEMI Electromagnetic interferenceETSI European Telecommunications Standards InstituteFCC Federal Communications CommissionFDD Frequency division duplexMIMO Multiple input multiple outputOTA Over-the-airRSE Radiated spurious emissionsSISO Single input single outputTD Transmit diversityTDD Time division duplexTIS Total isotropic sensitivityTRP Total radiated powerUL UplinkWCDMA Wideband code divison multiple accessFig. 6 CDF results obtained with three different RF test chambers forreceiver performance tests in LTE transmit diversity mode.20