A Flexible Testbed for 5G Waveform Generation & Analysis. Greg Jue Keysight Technologies

Transcription

1 A Flexible Testbed for 5G Waveform Generation & Analysis Greg Jue Keysight Technologies

2 Agenda Introduction 5G Research: Waveforms and Frequencies Desired Testbed Attributes and Proposed Approach Wireless Band Case Study FBMC and LTE Co-Existence Microwave Case Studies, 28 GHz FBMC Multi-Carrier OFDM Single-Carrier Millimeter-Wave Case Studies 60 GHz Upconverter: Single Carrier 72 GHz Upconverter / Downconverter: Single Carrier Generation & Analysis Page 2

3 5G Research Challenges 1000X higher mobile data volume per geographical area 10 to 100X more connected devices 10 to 100X higher typical user data rate 10X lower energy consumption End-to-end latency of < 1ms Ubiquitous 5G access including in low density areas Source: The 5G Infrastructure Public Private Partnership, details available at Generation & Analysis Page 3

4 5G Enabling Devices >> Research Challenges New waveforms Legacy OFDM enhancement FBMC, UFMC, GFDM Amplifier Envelope tracking Digital predistortion Wide, multi-bands Multiple Access Non-orthogonal multiple access(noma,scma) Random / scheduled / hybrid Advanced signal processing Multiple MIMO modes and Hybrid Beamforming Network interference suppression Adaptive channel estimation / equalization Multiple radio technologies GSM/EDGE/WCDMA/HSPA/LTE WiFi/BT/WiGig/GNSS/5G Full duplex communications Self interference cancellation Dual polarization antenna Real time operation Multi-antenna Impedance matching Mutual coupling Multi-band, multi-rat port sharing FD / Massive MIMO Multi-band Traditional cellular bands <6GHz WiFi, BT, GNSS bands 5G mmwave bands Source: The 5G Infrastructure Public Private Partnership, details available at Generation & Analysis Page 4

5 Waveform Design Considerations for 5G Waveform Advanced Multi-Carrier Waveforms 1 OFDM FBMC / OFDM / Others Single carrier Bandwidth / Frequency >> Wider bandwidths, higher frequencies New RAT OFDMA NOMA SCMA Note 1 : Orthogonal Frequency Division Multiplexing(OFDM) Filter Bank Multicarrier(FBMC) Universal Filtered Multicarrier(UFMC) Generalized Frequency Division Multiplexing(GFDM) Frequency Quadrature Amplitude Modulation(FQAM) Generation & Analysis Page 5

6 Waveform Requirements Flexible and scalable Optimized multiple access Efficient usage of the allocated spectrum Robustness to narrowband jammers and impulse noise Low latency Simultaneous operation of synchronous and asynchronous traffic High spectral and temporal fragmentation Coexistence with legacy OFDM waveforms Generation & Analysis Page 6

7 Different Types of Waveforms and Filter Operations OFDM per full-band FBMC ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ per sub-carrier UFMC per sub-band Generation & Analysis Page 7

8 OFDM Advantages Good spectral efficiency Resistance against multipath interference Efficiently implemented using FFTs and IFFTs Subcarrier nulls correspond to peaks of adjacent subcarriers for zero inter-carrierinterference Drawbacks Some loss of spectral efficiency due to Cyclic Prefix insertion Imperfect synchronization cause loss of orthogonality Large peak to average power ratio (PAR) High out-of-band power Subcarrier intermodulation must be reduced frequency f 1 f 2 Generation & Analysis Page 8

9 Symbol mapping Sub-carrier mapping OQAM preprocessing IFFT Poly Phase Network P / S S / P Poly Phase Network FFT OQAM post processing Sub-carrier de-mapping Symbol de-mapping Symbol mapping Sub-carrier mapping IFFT P / S S / P FFT Sub-carrier de-mapping Symbol de-mapping Filterbank Multicarrier (FBMC) vs. OFDM OFDM baseband signal processing blocks Synthesis Filter bank Analysis Filter bank FBMC baseband signal processing blocks Generation & Analysis Page 9

10 raised cosine han/ham/bm chebyshev OFDM and FBMC Unified Block Diagram Block Diagram of OQAM/FBMC of OFDM and FBMC IS 0 (t) P t S 0 jqs 0 (t) IS 1 (t) P T t P t T 2 P t e j2πf 0t + x e j2πf e 1t j( 2π T t + π 2 ) Transmit Signal Equation for Filtered OFDM X(t) = P t n k S k = Π( t T/2 ) h t T Impulse Response n P t nt e j2πk(t nt)/t Frequency Response S 1 jqs 1 (t).... P T t P t T IS N 1( t) P t + x x e j2πfn e 1 t + + j(n 1)(2π t + π ) T 2 jqs N 1( t) S N 1 P T t P t T 2 x x Transmit Signal Equation for FBMC For more information, please see the How to Understand 5G: Waveforms video at X(t) = n k S k n P k j k + n π/2 P k t = p t e e t nt/2 jπkt/t Generation & Analysis Page

11 Filterbank Multicarrier (FBMC) vs. OFDM FBMC filtering can have different K factors, or filter overlap factors, which provide varying levels of out-ofband spectral rejection Generation & Analysis Page 11

12 UFMC - Universal Filtered Multi-Carrier Generation & Analysis Page 12

13 Desired Attributes of a Flexible Testbed Generating and analyzing new waveforms Supporting a wide range of modulation bandwidths, from several MHz to a few GHz Supporting a wide range of frequency bands, from RF to microwave to millimeter-wave Generation & Analysis Page 13

14 Flexible Waveform Generation: Software + AWG+ PSG Generation & Analysis Page 14

15 Flexible Testbed for 5G Waveform Generation & Analysis 63 GHz Infiniium oscilloscope with VSA software M8190A AWG with SystemVue W1906 5G Baseband Exploration Library and N7608B Signal Studio for Custom Modulation software installed on embedded controller N9040B UXA signal analyzer 44 GHz E8267D PSG vector signal generator with wideband IQ inputs Millimeter-wave upconverters / downconverters Keysight GHz VDI GHz N5183B MXG microwave analog signal generators for upconverter / downconverter LO s *Note: Different test equipment configurations may be used dependent on frequencies and bandwidths Generation & Analysis Page 15

16 Agenda Introduction 5G Research: Waveforms and Frequencies Desired Testbed Attributes and Proposed Approach Wireless Band Case Study FBMC and LTE Co-Existence Microwave Case Studies, 28 GHz FBMC Multi-Carrier OFDM Single-Carrier Millimeter-Wave Case Studies 60 GHz Upconverter: Single-Carrier 72 GHz Upconverter / Downconverter: Single-Carrier Generation & Analysis Page 16

17 FBMC Co-Existence with LTE Case Study Test Configuration Generation & Analysis Page 17

18 FBMC Co-Existence with LTE Case Study Generation & Analysis Page 18

19 FBMC Co-Existence with LTE Case Study Generation & Analysis Page 19

20 FBMC Co-Existence with LTE Case Study EVM = 0.6% Generation & Analysis Page 20

21 LTE EVM, % FBMC Co-Existence with LTE Case Study (continued) EVM= 20.1% LTE EVM vs. FBMC Spectrum Notch Width EVM= 2.1% EVM= 0.6% EVM= 1.25 % FBMC Notch Width (# Subcarriers) Generation & Analysis Page 21

22 Agenda Introduction 5G Research: Waveforms and Frequencies Desired Testbed Attributes and Proposed Approach Wireless Band Case Study FBMC and LTE Co-Existence Microwave Case Studies, 28 GHz FBMC Multi-Carrier OFDM Single-Carrier Millimeter-Wave Case Studies 60 GHz Upconverter: Single-Carrier 72 GHz Upconverter / Downconverter: Single-Carrier Generation & Analysis Page 22

23 Microwave Case Study Test Configuration Generation & Analysis Page 23

24 Simplify Signal Creation- Custom 5G N7608B Signal Studio for Custom Modulation Flexible solution supports early 5G wireless research and development Create emerging 5G candidate waveforms, such as filter bank multicarrier (FBMC): - Configure custom FBMC waveforms and set parameters - Set FBMC filter settings such as filter overlap factor (K) and filter bank structure - Use Interactive filter editor to configure FBMC filter coefficients Generation & Analysis Page 24

25 Wideband FBMC- Configure Waveform Parameters Configure FBMC Waveform: FFT length Guard Subcarriers Number of Symbols Idle Interval Initial / Final Transition Cutoff Sample Frequency Generation & Analysis Page 25

26 Wideband FBMC- Configure Filter FBMC Filter Settings: Set filter overlap factor (K) Set filter bank structure: - Extended IFFT - Polyphase network FBMC Filter Editor: View frequency response Import/export filter coefficients from/to files Generation & Analysis Page 26

27 Wideband FBMC- Configure Resource Mapping Set Resource Mapping: Add/edit resource blocks such as preambles, pilots, and data Set on/off state, symbol index, subcarrier index, boost level, modulation type, payload/ IQ values for each resource block View Resource Mapping: Data, pilot, preamble vs. symbol Modulation vs. symbol Generation & Analysis Page 27

28 Wideband FBMC Waveform Generation M8190A AWG E8267D PSG Generation & Analysis Page 28

29 Wideband FBMC- 2 GHz Wideband Modulation at 28 GHz Center Frequency 2 GHz wide Generation & Analysis Page 29

30 Wideband Multi-Carrier OFDM Waveform Generation at 28 GHz M8190A AWG E8267D PSG Generation & Analysis Page 30

31 Wideband Multi-Carrier OFDM ~500 MHz Modulation at 28 GHz Center Frequency with Channel Equalization Enabled Generation & Analysis Page 31

32 Wideband Multi-Carrier OFDM ~1 GHz Modulation at 28 GHz Center Frequency with Channel Equalization Enabled Generation & Analysis Page 32

33 Wideband Single Carrier Waveform Generation at 28 GHz FIR filter to be used for corrections Generation & Analysis Page 33

34 Wideband Single Carrier 500 MHz Wideband Modulation at 28 GHz Center Frequency with Adaptive Eq. Enabled Adaptive Equalizer Complex Frequency Response Generation & Analysis Page 34

35 Apply Real and Imaginary to an FIR Filter Generation & Analysis Page 35

36 Wideband Single Carrier 500 MHz Wideband Modulation at 28 GHz Center Frequency After Corrections without Adaptive Eq. Generation & Analysis Page 36

37 Wideband Single Carrier- 1 GHz Wideband Modulation at 28 GHz Center Frequency After Corrections without Adaptive Equalization Generation & Analysis Page 37

38 Wideband EVM Considerations EVM Considerations: IQ Gain Imbalance IQ Skew Phase Noise Integrated Noise vs. Modulation Bandwidth Generation & Analysis Page 38

39 Agenda Introduction 5G Research: Waveforms and Frequencies Desired Testbed Attributes and Proposed Approach Wireless Band Case Study FBMC and LTE Co-Existence Microwave Case Studies, 28 GHz FBMC Multi-Carrier OFDM Single-Carrier Millimeter-Wave Case Studies 60 GHz Upconverter: Single-Carrier 72 GHz Upconverter / Downconverter: Single-Carrier Generation & Analysis Page 39

40 60 GHz Case Study Test Setup- Upconverter Only Keysight N5152A 5 GHz / 60 GHz Millimeter-wave upconverter Generation & Analysis Page 40

41 60 GHz Case Study Test Configuration LAN Generation & Analysis Page 41

42 Wideband Single Carrier- 2 GHz Wideband Modulation at GHz Center Frequency After Corrections without Adaptive Eq. Generation & Analysis Page 42

43 72 GHz Case Study Test Setup- Upconverter and Downconverter VDI GHz Millimeter-wave upconverter VDI GHz Millimeter-wave downconverter Generation & Analysis Page 43

44 72 GHz Case Study Test Configuration- Upconverter and Downconverter Generation & Analysis Page 44

45 Wideband Single Carrier- 2GHz Wideband Modulation at 4 GHz Downconverter Output After Corrections without Adaptive Eq. (7 GHz IF 72 GHz 4 GHz IF) Generation & Analysis Page 45

46 Waveform Design Considerations for 5G Waveform Advanced Multi-Carrier Waveforms 1 OFDM FBMC / OFDM / Others Single carrier Bandwidth / Frequency >> Wider bandwidths, higher frequencies New RAT OFDMA NOMA SCMA Note 1 : Orthogonal Frequency Division Multiplexing(OFDM) Filter Bank Multicarrier(FBMC) Universal Filtered Multicarrier(UFMC) Generalized Frequency Division Multiplexing(GFDM) Frequency Quadrature Amplitude Modulation(FQAM) Generation & Analysis Page 46

47 New Video: Generation & Analysis Page 47

48 New Whitepaper- Download it from: Generation & Analysis Page 48

49 Summary Demonstrated flexible testbed approach for 5G applications using off-the-shelf design simulation and test equipment-- quickly evaluate what-if scenarios in the R&D lab Waveform flexibility is provided by software; flexibility in bandwidths and frequencies is provided by hardware Case study to evaluate co-existence between FBMC and LTE Wideband waveform signal generation and analysis case studies at 28 GHz, 60 GHz, and 72 GHz Investigated vector corrections to improve waveform performance over wide modulation bandwidths For more information, visit Generation & Analysis Page 49

50 Thank You! Generation & Analysis Page 50