A Flexible Testbed for 5G Keysight Technologies Waveform Generation & Analysis€¦ · · 2015-05-11Filterbank Multicarrier (FBMC) vs. OFDM A Flexible Testbed for 5G Waveform Generation

A Flexible Testbed for 5G Waveform Generation & Analysis

Greg Jue

Keysight Technologies

Page

© 2015 Keysight Technologies

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

A Flexible Testbed for 5G Waveform

Generation & Analysis 2

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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 www.5g-ppp.eu/kpis/

http://www.5g-ppp.eu/kpis/



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5G Enabling Devices >> Research Challenges



Multi-band • Traditional cellular bands <6GHz

• WiFi, BT, GNSS bands

• 5G mmWave bands

Multi-antenna • Impedance matching

• Mutual coupling

• Multi-band, multi-RAT port

sharing

• FD / Massive MIMO

Amplifier • Envelope tracking

• Digital predistortion

• Wide, multi-bands

Multiple radio technologies • GSM/EDGE/WCDMA/HSPA/LTE

• WiFi/BT/WiGig/GNSS/5G

Advanced signal processing • Multiple MIMO modes and Hybrid Beamforming

• Network interference suppression

• Adaptive channel estimation / equalization

Full duplex communications • Self interference cancellation

• Dual polarization antenna

• Real time operation

New waveforms • Legacy OFDM enhancement

• FBMC, UFMC, GFDM

Multiple Access • Non-orthogonal multiple

access(NOMA,SCMA)

• Random / scheduled /

hybrid

Source: The 5G Infrastructure Public Private Partnership, details available at www.5g-ppp.eu/kpis/




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Waveform Design Considerations for 5G



Bandwidth /

Frequency

Waveform

New RAT

Advanced Multi-Carrier Waveforms1

OFDM FBMC / OFDM / Others Single carrier

>> Wider bandwidths, higher frequencies

Note1: • Orthogonal Frequency Division Multiplexing(OFDM)

• Filter Bank Multicarrier(FBMC)

• Universal Filtered Multicarrier(UFMC)

• Generalized Frequency Division Multiplexing(GFDM)

• Frequency Quadrature Amplitude Modulation(FQAM)

OFDMA NOMA SCMA

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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



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Different Types of Waveforms and Filter Operations



UFMC

per sub-band

OFDM

per full-band

^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ FBMC

per sub-carrier

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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-carrier-

interference

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

f1 f2

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Filterbank Multicarrier (FBMC) vs. OFDM



IFF

T

P

/

S

S

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Sub-c

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Sub-c

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de

-ma

ppin

g

Sym

bo

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de

-ma

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OFDM baseband signal processing blocks

OQ

AM

pre

pro

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ssin

g

IFF

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Ne

two

rk

P

/

S

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T

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post pro

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Synthesis Filter bank Analysis Filter bank

Sym

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ppin

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Sub-c

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Sub-c

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FBMC baseband signal processing blocks

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𝑋(𝑡) =

𝑛

𝑘

𝑆𝑘 𝑛 𝑃 𝑡 − 𝑛𝑇 𝑒 𝑗2𝜋𝑘(𝑡 − 𝑛𝑇)/T

OFDM and FBMC Transmit Signal Equation for Filtered OFDM

𝑃 𝑡 = 𝛱(𝑡−𝑇/2

𝑇) ∗ ℎ 𝑡

𝑋(𝑡) =

Transmit Signal Equation for FBMC

𝑛

𝑘

𝑆𝑘 𝑛 𝑃𝑘 𝑡 − 𝑛𝑇/2

𝑗𝜋𝑘𝑡/𝑇 𝑃𝑘 𝑡 = 𝑝 𝑡 𝑒 𝑒

𝑗 𝑘 + 𝑛 𝜋/2

x

+ . . .

𝑆0

x 𝑆1

x 𝑆𝑁 − 1

𝑃𝑇 𝑡

𝑃𝑇 𝑡

𝑃𝑇 𝑡

.

.

.

𝑒 𝑗2𝜋𝑓0𝑡

𝑒 𝑗2𝜋𝑓1𝑡

𝑒 𝑗2𝜋𝑓𝑁 − 1𝑡

Unified Block Diagram of OFDM and FBMC

+

.

.

.

𝐼𝑆0(𝑡)

x

x

𝑃 𝑡

.

.

.

𝑒

+

𝑃 𝑡 −𝑇

2 𝑗𝑄𝑆0(𝑡)

𝐼𝑆1(𝑡) 𝑃 𝑡

+

𝑃 𝑡 −𝑇

2 𝑗𝑄𝑆1(𝑡)

𝐼𝑆𝑁 − 1(𝑡) 𝑃 𝑡

+

𝑃 𝑡 −𝑇

2 𝑗𝑄𝑆𝑁 − 1(𝑡)

𝑗(2𝜋𝑇𝑡 + 𝜋

2)

𝑒 𝑗(𝑁 − 1)(2𝜋

𝑇𝑡 + 𝜋

2)

Block Diagram of OQAM/FBMC

rais

ed

cosin

e

Impulse Response Frequency Response

han

/ham

/bm

ch

eb

ysh

ev


Generation & Analysis

For more information, please see the “How to Understand 5G:

Waveforms” video at www.keysight.com/find/eesof-how-to-videos

http://www.keysight.com/find/eesof-how-to-videos







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Filterbank Multicarrier (FBMC) vs. OFDM



FBMC filtering can have different K factors, or filter overlap factors, which provide varying levels of out-of-

band spectral rejection

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UFMC - Universal Filtered Multi-Carrier



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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

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Flexible Waveform Generation: Software + AWG+ PSG

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Flexible Testbed for 5G Waveform Generation & Analysis



*Note: Different test equipment configurations may be used

dependent on frequencies and bandwidths

63 GHz Infiniium

oscilloscope with 89600

VSA software

M8190A AWG

with SystemVue W1906 5G

Baseband Exploration

Library and N7608B Signal

Studio for Custom

Modulation software installed

on embedded controller

44 GHz E8267D PSG

vector signal generator

with wideband IQ inputs

Millimeter-wave

upconverters /

downconverters

N9040B UXA

signal analyzer

N5183B MXG microwave analog signal

generators for upconverter /

downconverter LO’s

VDI 60-90 GHz

Keysight 58-64 GHz

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– Introduction






• FBMC


• Single-Carrier


• 60 GHz Upconverter: Single-Carrier

• 72 GHz Upconverter / Downconverter: Single-Carrier



Agenda

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FBMC Co-Existence with LTE Case Study Test Configuration



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FBMC Co-Existence with LTE Case Study



Page





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EVM = 0.6%

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FBMC Co-Existence with LTE Case Study (continued)



LTE EVM vs. FBMC Spectrum Notch Width

LT

E E

VM

, %

FBMC Notch Width (# Subcarriers)

EVM= 0.6% EVM= 1.25 %

EVM= 2.1%

EVM= 20.1%

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– Introduction






• FBMC


• Single-Carrier






Agenda

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Microwave Case Study Test Configuration



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Simplify Signal Creation- Custom 5G

• 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

N7608B Signal Studio for Custom Modulation

24

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Wideband FBMC- Configure Waveform Parameters



Configure FBMC Waveform: • FFT length

• Guard Subcarriers

• Number of Symbols

• Idle Interval

• Initial / Final Transition Cutoff

• Sample Frequency

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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

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Wideband FBMC- Configure Resource Mapping



View Resource Mapping: • Data, pilot, preamble vs.

symbol

• Modulation vs. symbol

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

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Wideband FBMC Waveform Generation



M8190A

AWG

E8267D PSG

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Wideband FBMC- 2 GHz Wideband Modulation at 28 GHz Center Frequency



2 GHz wide

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Wideband Multi-Carrier OFDM Waveform Generation at 28 GHz



M8190A

AWG

E8267D PSG

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Wideband Multi-Carrier OFDM ~500 MHz Modulation at 28 GHz Center Frequency with Channel Equalization Enabled



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Wideband Multi-Carrier OFDM ~1 GHz Modulation at 28 GHz Center Frequency with Channel Equalization Enabled



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Wideband Single Carrier Waveform Generation at 28 GHz



FIR filter to be used for corrections

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Wideband Single Carrier 500 MHz Wideband Modulation at 28 GHz Center Frequency with Adaptive Eq. Enabled



Adaptive Equalizer

Complex Frequency

Response

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Apply Real and Imaginary to an FIR Filter



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Wideband Single Carrier 500 MHz Wideband Modulation at 28 GHz Center Frequency After Corrections without Adaptive Eq.



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Wideband Single Carrier- 1 GHz Wideband Modulation at 28 GHz Center Frequency After Corrections without Adaptive Equalization



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Wideband EVM Considerations



EVM Considerations:

• IQ Gain Imbalance

• IQ Skew

• Phase Noise

• Integrated Noise vs. Modulation Bandwidth

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– Introduction






• FBMC


• Single-Carrier






Agenda

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60 GHz Case Study Test Setup- Upconverter Only



Keysight N5152A

5 GHz / 60 GHz

Millimeter-wave

upconverter

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60 GHz Case Study Test Configuration



LAN

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Wideband Single Carrier- 2 GHz Wideband Modulation at 60.48 GHz Center Frequency After Corrections without Adaptive Eq.



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72 GHz Case Study Test Setup- Upconverter and Downconverter



VDI 60-90 GHz

Millimeter-wave

upconverter

VDI 60-90 GHz

Millimeter-wave

downconverter

Page


72 GHz Case Study Test Configuration- Upconverter and Downconverter



Page


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



Page


Waveform Design Considerations for 5G



Bandwidth /

Frequency

Waveform

New RAT

Advanced Multi-Carrier Waveforms1

OFDM FBMC / OFDM / Others Single carrier

>> Wider bandwidths, higher frequencies

Note1: • Orthogonal Frequency Division Multiplexing(OFDM)

• Filter Bank Multicarrier(FBMC)

• Universal Filtered Multicarrier(UFMC)

• Generalized Frequency Division Multiplexing(GFDM)

• Frequency Quadrature Amplitude Modulation(FQAM)

OFDMA NOMA SCMA

Page


New Video: www.youtube.com/user/KeysightCellular



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New Whitepaper- Download it from: www.keysight.com/find/5G-insight



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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 www.keysight.com/find/5G-insight

http://www.keysight.com/find/5G-insight



Page


Thank You!



Documents

A Flexible Testbed for 5G Keysight Technologies Waveform Generation & Analysis€¦ · · 2015-05-11Filterbank Multicarrier (FBMC) vs. OFDM A Flexible Testbed for 5G Waveform Generation