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

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WIRELESS TECHNOLOGIES | Test cellsPass/fail measurements and qualification measurements onMIMO-enabled wireless devices can be performed usinga compact and simple test setup with the R&S®DST200RF diagnostic chamber (Fig. 4, example 2). All LTE parameterscan be configured with the R&S®AMS32 measurementsoftware and the R&S®AMS32-K31 option (Fig. 5). The twodownlink signals from the R&S®CMW500, which simulatesthe base station, are connected to the R&S®DST-B210 crosspolarizedtest antenna. The automated 3D positioner alignsthe EUT in any desired orientation in the polar coordinate systemto provide a complete picture of the spatial MIMO characteristics.Receiver sensitivity is plotted in a 3D diagram thatreveals any sensitivity degradation in partial areas. The averagedata throughput is plotted versus the received signal level.LTE parameterLTE bandSettings for LTE link1 to 41, FDD, TDD, depending on EUT capabilitiesRadio channels e. g. 5180 to 5279 for LTE FDD 13ModulationResource blocks 1 to 100Start of resource block 0 to 99Transport block size index 0 to 26BandwidthMIMO modeQSPK, 16QAM, 64QAM1.4 / 3 / 5 / 10 / 15 / 20 MHztransmit diversity, open and closed loop spatialmultiplexingFig. 5 Configuration of MIMO measurements using the R&S®AMS32 OTAperformance measurement software and the R&S®AMS32-K31 option.Example 3: A-GPS testGPS (ϕ polarized)GPS (θ polarized)¸OSP130¸SMU 200¸CMU 200Common linkDL / UL¸DST 200 (¸DST-B160,¸DST-B210, ¸DST-B270)Example 4: RSE test¸OSP130¸ESU8¸CMW 500Highpass filterϕ polarizedθ polarizedCommon linkDL / UL¸DST 200 (¸DST-B160,¸DST-B210, ¸DST-B270)Level in dBm–25RSE limit value–30–35–40–45–50–55–60–65–70–75–802.2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8Frequency in GHzNEWS 205/12 19
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
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