Impact of mm-wave Range and Large Bandwidth on RF System Design. R&S Taiwan Feiyu Chen

Transcription

1 Impact of mm-wave Range and Large Bandwidth on RF System Design R&S Taiwan Feiyu Chen

2 Simplified RF Architecture ı ITU Band 11 (Extremely High Frequency) 30 to 300 GHz ı Wavelength range 1 to 10 mm Digital Baseband Signal Processing DAC ADC Tx (IF / RF) Rx (IF / RF) Antenna 2

3 Challenge in DAC/ADC design ı Speed ı Bandwidth ı Dynamic range ı Synchronization performance 3

4 Challenge in ADC design ı Two-tone signal for intermodulation characterization Important: minimal intermodulation between the 2 tones ı Modulated signals (RF, IF, or analog I/Q signals) 2 GHz BW Phase Coherence 4

5 Challenge in DAC/ADC testing ı Clock with minimal jitter -170 dbc/hz 5

6 Challenge in DAC/ADC testing ı Power integrity Noise Ripple Transient Drift Crosstalk Spurious signals DC power (10 mv/div) DC power (1 V/div) 6

7 Challenge in DAC/ADC testing ı Power supply HMP series Low residual ripple down to 150 uv(rms) Low noise Low residual deviation 7

8 Challenge in DAC design ı Performance characterization signal quality, e.g. SFDR phase noise harmonics spurious emissions modulation quality 8

9 5G Challenges PA Implementation Challenge - Very High Data Rate ( = High Bandwidth) Waveform Support high frequency Support high bandwidth Measure modulation accuracy (EVM) RF PA RF 9

10 PA measurement

11 PA measurement

12 PAE typical power added efficiency (PAE) signal amplitude probability 12

13 PAE Maximum Output Power of the PA 13

14 R&S Test Solution 5G wideband signal generation and signal analysis Signal and spectrum analysis Analysis up to 90 GHz w/o external mixer and up to 2GHz demodulation bandwidth (internal with FSW-B2001 for FSW43/50, using RTO2044 and FSW-B2000 for FSW26/67/85) Remote controlled RF R&S RTO2044 Signal generation R&S FSW Device under test R&S SMW200A RF 2 RF outputs up to 20GHz each or 1 RF output up to 58 GHz 65 GHz (40GHz w/o V-Band up-converter) with up to 2GHz bandwidth 14

15 Typical test setup for 5G RF parametric measurements up to 40 GHz R&S SMW200A Vector Signal Generator Demystifying 5G Numerology and Initial Access Concept for 5G NR June 29 th 2017 R&S FSW Signal and Spectrum Analyzer Up to 40 GHz with up to 2 GHz modulation bandwidth Automatic correction of frequency response independent of frequency, power level and bandwidth Software option SMW-K118 for Verizon Wireless 5GTF testing Option SMW-K114 for early 5G NR testing Dedicated 5G NR option under preparation 43.5 or 50 GHz with 2000 MHz internal analysis bandwidth (B1200, B2001) Option FS-K118/K119 for V5GTF signal analysis (DL and UL) Dedicated 5G NR option under preparation VSE-K96 OFDM Signal Analysis Software for analyzing OFDM-based 5G NR signals TCP/IP

16 R&S SMW200A Vector Signal Generator ı f-ofdm: with Filter Length = 1 and Subband = 1 generic OFDM signals can be generated. Set FFT size Set subcarrier spacing CP Y/N? Occupied Bandwidth # of Symbols 16

17 R&S SMW200A vector signal generator

18 Mapping of Custom IQ signals ı Software option R&S SMW-K114 is very flexible in terms of signal mapping to the defined resource grid ı Sequence is usually first mapped in frequency domain (subcarrier), then in time domain (symbols) ı Any Custom IQ signal, coming out of an simulation environment (e.g. MATLAB) can be mapped to the resource grid

19 5G NR-like waveform for receiver testing NR-PDCCH Control channel, QPSK (simplified, not taken into account current CORESETs) SS block Gap represents guard symbol and one symbol for e.g. NR-PUCCH NR-PDSCH Data, 64QAM

20 5G NR-like waveform for receiver testing Detail: SS block

21 Cell ID: creation of NR-PSS/SSS in Matlab

22 5G NR-like waveform for receiver testing Detail: NR-PDCCH NR-PDCCH, QPSK 2 symbols due to SCS of 120 khz (simplified, not taken into account current CORESETs) Create a data list and use as payload; data list is a payload sequence, e.g. could come out of the MAC emulator as a Polar Code coded sequence

23 5G NR-like waveform for receiver testing Detail: NR-PDSCH NR-PDSCH, 64QAM (simplified, doesn t take into account DMRS) Create a data list and use as payload; data list is a payload sequence, e.g. could come out of the MAC emulator as a LDPC coded sequence

24 Multi-Carrier signal generation up to 2 GHz modulation bandwidth and 40 GHz carrier frequency

25 R&S VSE vector signal explorer software Analyzing OFDM-based 5G NR signals with option R&S VSE-K96 ı User-definable and standard-independent OFDM demodulator ı Free configuration of parameters like FFT-order, CP length and allocation ı Wizard with a step-by-step guide for easy setup of the configuration file from a captured signal More information at

26 From MIMO to beamforming GHz wavelength/2 120 elements 3 50 mm 6 m 30 5 mm 0.6 m 26

27 Gain (dbi) Gain (dbi) How to Steer Beams? 8 Element Dipole Array Example Principle of Beamforming & Beamsteering Beamsteering (Phase Shift) Sidelobe Suppression 1.Fixed antenna spacing d 2.Choose direction θ 3.Set phase shifts Δφ Broadside To far-field θ Δφ = 2π λ d sin θ φ1 φ2 φ3 Antennas Phase Shifters Attenuators d φm 27

28 R&S Solution Shielding solutions for OTA testing R&S ATS1000 Spherical positioner or Multiple antennas 28

29 EiRP Measurements OTA Power Sensor: Vivaldi Antenna + Power Meter DUT RF OTA OTA RF Digital DUT 2D Beam-Steering 3D Beam-Steering R&S TS7124 Shielded Box R&S NRPM-A66/81 OTA Power Sensor R&S NRPM3 Power Meter DUT 29

30 EiRP Measurements 30

31 R&S Test Solution OTA Test Chambers Large chambers OTA R&D: WPTC (spiral scanner) OTA R&D / Production: ATS1000 OTA R&D: DST200 OTA Production: TS7124 DUT Cars, Base stations Base stations, Laptops, UEs Sub-Arrays, UEs UEs, Tablets UEs Dimensions [W x D x H] Up to 5.8 x 5.2 x 5.1 m 2.4 x 2.4 x 2.4 m to 4.6 x 3.7 x 3.45 m 0.9 x 1.5 x 2 m 0.77 x 0.76 x 0.7 m 0.45 x 0.48 x 0.4 m 31

32 R&S Antenna Test Solutions Summary Massive MIMO CTIA Radiation Patterns mmwave Beamsteering R&S TS8991 R&S TS8991 PWC for Massive RF Pre-Conformance R&S MIMO TS8991: WPTC R&S TS7830 R&S ZVA/B/C/D DUT R&S SMW200A R&S FSV R&S NRP R&S NRPM-A66 R&S TS-F24 R&S RTO2044 R&S NRPM R&S ATS1000 mmwave Multiport Testing Production & Benchtop R&S ATS1000 R&S ZVA R&S DST200 R&S RTO R&S FSW R&S SMW200+ 6x R&S SGT100 R&S TS7124 R&S FSV/FSP R&S ZNBT R&S ZVC/D R&S SMW200A

33 5G channel sounding Generation of sounding sequences Real world environment I/Q data capturing Data analysis software I/Q data R&S SMW200A R&S FSW R&S TS-5GCS 33

34 Summary ı From cell-centric (2G - 4G) to user-centric / application-centric in 5G ı From link efficiency (2G - 4G) to system efficiency in 5G (RAT defined per app) ı From antenna connectors (2G - 4G) to Over-the-Air testing in 5G (antenna arrays, beamforming) ı Increasing demand for security / high reliability in 5G (up to mission- and safety-critical use cases) Rohde & Schwarz is committed to supporting the industry with the T&M solutions needed to investigate, standardize, develop and implement 5G products 34

35 If you want to go fast, go alone. If you want to go far, go together! African proverb 35