lte world summit 2012 grimley agilent-technologies-m_asterclass-1_wed

Download LTE World Summit 2012 grimley agilent-technologies-m_asterclass-1_wed

Post on 09-May-2015

758 views

Category:

Business

2 download

Embed Size (px)

DESCRIPTION

LTE World Summit Barcelona May 2012MASTERCLASS

TRANSCRIPT

  • 1.Greater insight. Greater confidence. Accelerate next-generation wireless.Verify and Visualize your LTE MIMO Beamforming SignalsCraig Grimley, R&D DeveloperElectronic Measurement Group, Agilent TechnologiesLTE World Summit, May 2012 Agilent Technologies1

2. Verify and Visualize yourLTE MIMO Beamforming Signals What is MIMO Beamforming ? Multi-antenna techniques Introduction to beamforming What are benefits ? Benefits for cellular network Use within LTE transmission modes What are the test verification challenges ? Typical TD-LTE eNB test configuration Agilent 8-Chan N7109A SA + 89600 VSA test solution LTE World Summit, May 2012 Agilent Technologies2 3. Multi-Antenna TechniquesSISOSIMO- No diversity protection - Rx diversityagainst channel fadingTx Rx Tx : Rx - Rx smart antenna(beamforming)- Improved SINRMISOMIMO- Tx diversity- Tx/Rx diversityTx : Rx - Tx smart antennaTx : : Rx - Tx/Rx smart antenna(beamforming) (beamforming)- Improved SINR - Spatial multiplexing- Improved SINRorImproved SpectralEfficiency / Data RatesLTE World Summit, May 2012 Agilent Technologies3 4. Multi-Antenna TechniquesTx Diversity Orthogonally modified redundant copies Tx0S0 S1 transmitted across multiple antennasTx1 -S1*S0* Robustness to channel fading / noiseFrequency domainSpatial Multiplexing Simultaneous unique data streams Tx0S0 transmitted across multiple antennasTx1S1 Improved spectral efficiency / throughputBeamforming Per antenna weighted signal copies S0.w0Tx0 transmitted across multiple antennasTx1 S0.w1 Coherent beamforming gain (dB) at receiver LTE World Summit, May 2012 Agilent Technologies4 5. Introduction to BeamformingRelative field strength exampleMain Lobe = omnidirectional0 deg-30 deg +30 deg-60 deg +60 deg-90 deg +90 deg|1 Antenna ElementLTE World Summit, May 2012 Agilent Technologies5 6. Introduction to BeamformingRelative field strength example Main Lobe = 0deg azimuthNumber of Nulls = 1Constructive0 degInterference -30 deg+30 degPower Gain -60 deg+60 deg DestructiveInterference Power Null -90 deg+90 deg||2 Antenna Elements Co-polarized 0.5 wavelength separation 0deg phase shift per elementLTE World Summit, May 2012 Agilent Technologies6 7. Introduction to BeamformingRelative field strength example Main Lobe = 0deg azimuthNumber of Nulls = 20 deg Improved-30 deg+30 deg Beam Selectivity -60 deg+60 deg -90 deg+90 deg|||3 Antenna Elements Co-polarized 0.5 wavelength separation 0deg phase shift per elementLTE World Summit, May 2012 Agilent Technologies7 8. Introduction to BeamformingRelative field strength example Main Lobe = 0deg azimuthNumber of Nulls = 30 deg Improved-30 deg+30 deg Beam Selectivity -60 deg+60 deg -90 deg+90 deg ||||4 Antenna Elements Co-polarized 0.5 wavelength separation 0deg phase shift per elementLTE World Summit, May 2012 Agilent Technologies8 9. Introduction to BeamformingRelative field strength example Main Lobe = -30deg azimuth Number of Nulls = 3 0 deg-30 deg+30 deg-60 deg+60 deg-90 deg+90 deg|||| 4 Antenna ElementsBeamCo-polarized 0.5 wavelength separationControl 90deg phase shift per element LTE World Summit, May 2012 Agilent Technologies9 10. Introduction to Beamforming Used in many technologies: radar, sonar, seismology, wireless communications, radio astronomy, acoustics Takes advantage of multi-antenna interference patterns Constructive (in-phase)Destructive (out-of-phase)0 deginterference interference -30 deg+30 degPower GainPower Nulling -60 deg+60 deg -90 deg+90 deg |||| Antenna array geometry 4 Antenna Elements+Co-polarized 0.5 wavelength separation 90deg phase shift per elementRelative mag / phase weightings LTE World Summit, May 2012 Agilent Technologies10 11. Benefits for Cellular Network Coherent Beamforming Gain (dB) UE3 Improved SINR observed at UE device Increased throughput at cell-edge Increased cell coverage or size eNB3UE4 Spatial Selectivity Mitigate intra-cell interferenceUE1Null Mitigate inter-cell interference Null Improve spectrum efficiency (SDMA, Space Division Multiple Access)eNB1UE2 eNB2 LTE World Summit, May 2012 Agilent Technologies11 12. LTE DL Transmission Modes 3GPP Release 8: TM1: SISO single antenna transmissions TM2 :Tx Diversity using 2 or 4 antennas TM3: Open-Loop SU-MIMO (Spatial Multiplexing) TM4: Closed-Loop SU-MIMO TM5: Closed-Loop MU-MIMO TM6: Rank 1 Spatial Multiplexing TM7: Single Layer Beamforming on Port 5TM7 & TM8 Beamformingis current TD-LTE 3GPP Release 9:market focus TM8: Dual Layer Beamforming on Ports 7 & 8 3GPP Release 10: TM9: Up to 8 layer transmissions using Ports 7 to 14 LTE World Summit, May 2012 Agilent Technologies12 13. LTE Signal Processing (TM7 & TM8)(Adapted from 3GPP 36.211 and 36.212) a0 , a1 ,..., a A 1PDSCH (Data) Transport block Channel encoded and mapped onto 1 or 2 codewords (layers) CRC attachment BF precoding is non-codebook based b0 , b1 ,..., bB 1 Code block segmentation BF precoding can vary per RB & per Subframe (TTI)Code block CRC attachment cr 0 , cr1 ,..., cr K r 1UE-specific RS (Reference Signal)Channel coding Mapped to associated TM7 / TM8 PDSCH RB allocations Same BF precoding as per associated PDSCH RB d r(i0) , d r(1) ,..., d r(i) ir 1D Rate matching Cell-specific RS (Reference Signal) Can be weighted to produce sector wide common control Broadcast pattern er 0 , er1 ,..., er Er 1 Possible when Num Physical Ports > Num CRS Ports Code block UE-specific patternconcatenationcodewordslayersantenna portsf 0 , f1 ,..., f G 1ModulationResource element OFDM signal UE1Scrambling mappermapper generationLayerPrecodingmapper ModulationResource element OFDM signalScrambling mappermapper generationUE-specific RSCell-specific RS Broadcast pattern LTE World Summit, May 2012 Agilent Technologies13 14. LTE Signal Processing (TM7 & TM8)(Adapted from 3GPP 36.211 and 36.212)TM7Single LayerUE-specific RS Port 5TM8Dual LayerUE-specific RS Port 7 Port 8CommonCell-specific RS Port 0 Port 1 Port 2Port 3LTE World Summit, May 2012 Agilent Technologies14 15. Typical TD-LTE eNB Test Configuration A1 A2A3 A4 A5 A6A7 A8UL RF Channel~0.5 * RF carrier wavelength spacing Uplink feedback Emulator 2x8 (SRS, CQI, PMI, RI)A1, A2, A3, A4 = +45 degree polarizationA5, A6, A7, A8 = -45 degree polarization ~10dB Ant 1 Ant 2 Ant 3 Ant 4DL RF eNB eNB CALCALChannelBB RRH Ant 5 Coupler EmulatorUE1 Ant 6 8x2 Ant 7 Ant 8 Common customer problem, need to verify: eNB RF antenna calibration accuracy BB beamforming weighting algorithm correctness RF Circulator RF & EVM modulation quality for MIMO single or RF Atten dual layer LTE World Summit, May 2012 Agilent Technologies15 16. Typical TD-LTE eNB Test Configuration A1 A2A3 A4 CALIBRATION A5 A6A7 A8REFERENCE UL RFSIGNAL ChannelUplink feedback~0.5 * RF carrier wavelength spacing EmulatorRF SOURCE& SPLITTER 2x8(SRS, CQI, PMI, RI)A1, A2, A3, A4 = +45 degree polarizationA5, A6, A7, A8 = -45 degree polarization ~10dB Ant 1 Ant 2 Ant 3 Ant 4DL RF eNB eNB CALCALChannelBB RRH Ant 5 Coupler Emulator UE1 Ant 6 8x2 Ant 7 Ant 8 Agilent 89600B VSAAgilent8-Chan N7109A RF Splitter Analyzer RF Circulator RF Atten~20dBLTE World Summit, May 2012 Agilent Technologies16 17. Typical TD-LTE eNB Test Configuration A1 A2A3 A4 CALIBRATION A5 A6A7 A8REFERENCE UL RFSIGNAL ChannelUplink feedback~0.5 * RF carrier wavelength spacing EmulatorRF SOURCE& SPLITTER 2x8(SRS, CQI, PMI, RI)A1, A2, A3, A4 = +45 degree polarizationA5, A6, A7, A8 = -45 degree polarization ~10dB Ant 1 Ant 2 Ant 3 Ant 4DL RF eNB eNB CALCALChannelBB RRH Ant 5 Coupler Emulator UE1 Ant 6 8x2 Ant 7 Ant 8 Agilent 89600B VSAAgilent8-Chan N7109A RF Splitter Analyzer RF Circulator RF Atten~20dBLTE World Summit, May 2012 Agilent Technologies17 18. Agilent 8-Chan N7109A SA + 89600 VSA8 Channel8 Channel RF SpectrumRF Time LTE World Summit, May 2012 Agilent Technologies18 19. Agilent 8-Chan N7109A SA + 89600 VSAUE-specificRS WeightsIQ Constellations DetectedResourceAllocationsCell-specific RS Weights &ImpairmentsUE-specific & EVM Common BroadcastMetrics Antenna Beampatterns LTE World Summit, May 2012 Agilent Technologies19 20. Agilent 8-Chan N7109A SA + 89600 VSAAnt Group 0pattern 8 Channel UE-specific RS Mag/Phase WeightsAnt Group 1pattern LTE World Summit, May 2012 Agilent Technologies20 21. Agilent 8-Chan N7109A SA + 89600 VSAAnt Group 0patternAnt Group 0 Cell-RS Weights 8 ChannelCell-RS MIMO Ant Group 1Impairments pattern & WeightsAnt Group 1 Cell-RS WeightsLTE World Summit, May 2012 Agilent Technologies21 22. Agilent 8-Chan N7109A SA + 89600 VSAIQ Polar LogMag (dB)Beamforming Gain (dB) LTE World Summit, May 2012 Agilent Technologies22 23. Agilent 8-Chan N7109A SA + 89600 VSATD-LTE (TM7 & TM8) measurement solutionProvides an 8-channel phase coherent measurement solution to enableverification and visualization of TD-LTE base station RF antennabeamforming signals. LTE World Summit, May 2012 Agilent Technologies23 24. For more information Application Note: http://www.agilent.com/find/LTE-Forward Youtube Video: http://www.youtube.com/watch?v=mj58aSOZ1Kc 8-Chan N7109A: http://www.agilent.com/find/N7109A 89600 VSA: http://www.agilent.com/find/89600 LTE: http://www.agilent.com/find/LTELTE World Summit, May 2012 Agilent Technologies24 25. Thank you ! LTE World Summit, May 2012 Agilent Technologies25

Recommended

View more >