Designing A Possible 5G PHY With GFDM

Gerhard P. Fettweis Ivan Gaspar, Luciano Mendes, Maximilian Matth, Nicola Michailow, Andreas Festag, Rohit Datta, Martin Danneberg, Dan Zhang coordinator

serial entrepreneur

1

Wireless >2020 Outlook

100Tb/s

10 Tb/s

1 Tb/s

100Gb/s

10Gb/s

1Gb/s

100Mb/s

10Mb/s

1Mb/s

100Kb/s

10Kb/s 1995 2000 2005 2010 2015 2020 2025 2030

? 802.11ac/ad 802.11n 802.11ag

802.11

802.11b

GSM GPRS

HSPA

HSDPA LTE

3G R99 / EDGE

LTE Advanced

WLAN (10m)

Cellular (100m)

The Tactile Internet And Its Millisecond

The Tactile Internet

Gerhard Fettweis Slide 5 12/8/2014 http://ostsee-spezial.de/?p=148

Moving from 25ms RTT 1ms tomorrow

10

Reinventing Latin Classes

MPI Saarbrcken

1ms examples of todays cars: ESC, ABS

Tomorrow: platooned ESC & ABS

Platooning

13

Revolution Ahead: The Tactile Internet

Gerhard Fettweis

4G:

Content

Communications

Health & Care Traffic & Mobility Sports & Gym Edutainment Manufacturing Smart Grid

5G:

Steering & Control

Communications

5G Massive Requirements

18

Sta

te o

f th

e ar

t

Massive safety and security

5G

The Tactile

Internet

> 10Gbit/s per user < 1ms RTT > 10k sensors per cell < 108 outage

Massive low latency

Massive throughput

Massive sensing

Massive resilience

Massive fractal heterogenity

< 1012 security 10x10 heterogeneity

19

5G L A B GERMANY

5G Research on four Tracks

Mobile edge cloud Silicon systems

Tactile Internet applications Wireless & Network

Members on Tracks

20

Wireless track

Silicon systems track

Mobile edge cloud track

Tactile Internet application track

Gerhard Fettweis

Eduard Jorswieck

Frank Ellinger

Christel Baier

Rene Schffny

Frank Fitzek

Leon Urbas

Christof Fetzer Uwe

Amann

Wolfgang Lehner

Ercan Altinsoy Thorsten Strufe

Klaus Janschek

Dirk Plettemeier

Wolfgang Nagel

Hermann Hrtig Michael Schrter Silvia Santini

Team of 500+ Researchers !!!

Relevant Startups Generated by Team

21

Wireless track Silicon systems track

Mobile edge cloud track

Tactile Internet application track

freedelity

Inhalt f ast a ctuators s ensors & t ransceivers

fast value chain

sales & service

systems, networks, software circuits

components semi-

conductors

fast network of

states

Berlin Brandenburg Mecklenburg Vorpommern

Saxony-Anhalt Saxony

Thuringia Baden-Wrtt. Lower Saxony

Bavaria

Coordinators: Frank Ellinger, (Gerhard Fettweis), TU Dresden Starting 2014, appox. 75M project size, 60+ partners

MODULATION FOR CM-WAVES

Gerhard Fettweis

1ms Impact: 100s PHY Latency

Hosted Computing (decider)

Network Config.

Manager (SON)

Terminal Air Interface

Base Station & Compute = 0.3 ms

= 0.2 ms = 0.5 ms

Latency Goals:

Software Ecosystem

1ms

Sensor Embedded Computing Receiver 100 s

Actuator Embedded Computing Receiver Trans mitter

100 s

Trans mitter

packet latency

100s

Requirements / Challenges

27

t async. operation

f

scalable bandwidth

f

fragmented spectrum

f

LTE clocking scheme

New Air Interface

The Subcarrier Time/Frequency Dilemma

30

frequency

time 1/R

R

GFDM Signal Properties

Multi-carrier scheme

Block based approach

Circular signal structure (time and frequency)

Gerhard P. Fetweis Slide 31

GFDM Signal Properties

Multi-carrier scheme

Block based approach

Circular signal structure (time and frequency)

Pulse shaped sub-carriers

Overlapping sub-carriers

Gerhard P. Fettweis Slide 32

Multi-Carrier Revisited OFDM GFDM SC-FDM

33

N time samples

N su

bcar

riers

N symbols

M sub-symbols

N fr

eque

ncy

sam

ples

K s

ubca

rrie

rs

M fr

eq. s

ampl

es

K time samples

N=KM

Realtime 5G Research Testbed: GFDM With -45dB to -65dB Notches !

Research on 5G Slide 34

LTE COMPATIBILITY

Gerhard Fettweis

The LTE Frame Structure

Gerhard Fettweis 37

LTE is clearly one order of magnitude above the target latency. The 5G goal: Reduce the 1 ms based frame structure to something in the order of 50-100 s.

frame n-1 frame n-1 frame n-1 ......

subframe 0 subframe 9...

slot 0 slot 1

symbol 0CP symbol 1CP symbol 6

CP...symbol 2

CP

10 ms

1 ms

0.5 ms

66.7 s

Problems with OFDM

Gerhard Fettweis 38

Every symbol requires a cyclic prefix, which depends on the channel. a) It reduces the spectral efficiency. b) It prevents reducing the latency by shortening the symbols.

OFDM requires frequency flat subcarriers Subcarrier bandwidth coupled to symbol duration. Reducing symbol duration imposes constraint on frequency selectivity of the channel.

coherence bandwidth

Proposed Frame Structure

Gerhard Fettweis 39

Step 1: Add a single prefix for entire frame. Step 2: Reduce the frame duration to 66.7 s.

Introducing subsymbols allows to decouple the frequency resolution from the bandwidth of the subcarriers. Coherence bandwidth can be the same as in OFDM (given same sampling frequency).

One LTE Symbol Can Host One 5G GFDM Packet

41

LTE Symbol (e.g. 4 PRBs) GFDM TTI (e.g. 7 Subsymbols)

TTI Framing Opportunity 100s

42

LTE 1ms OFDM TTI (here with 4 PRBs)

5G 70s GFDM TTI (here with 7 sub-symbols per symbol)

OQAM in GFDM Analyzing the structure of interference for a circular RC pulse

OQAM in GFDM

I & Q selecto

r +

complex symbols I & Q

selector

complex symbols

Modulator

modulated samples

Demodulator

GFDM Demodulat

or 1

GFDM Demodulat

or 2

GFDM Modulato

r 1

GFDM Modulato

r 2

GFDM A MODULATION FRAMEWORK

47

Flexible Spacing Between Subcarriers & Subsymbols tim

e fr

eque

ncy

FMT SE-FDM

FTN

default

GFDM for Virtualization of 5G Waveform Candidates

The design space of GFDM can be explored to obtain other waveforms

classical waveforms filterbank based waveforms

non-orthogonal multicarrier

MTC? Machine Type Communications (M2M SIG)

Gerhard Fettweis

Asynchronous transmission

Time offsets

In M2M, time shifts between the users cannot be controlled

Users cannot be orthogonal non-orthogonal signaling inevitable Increased protection can be achieved by re-allocating the CP

Frequency offsets

Should be handled by a subcarrier filter

with low spectral leakage

1 SC guard between users should be sufficient

Gerhard Fettweis 52

0 2 4 6 8-100

-80

-60

-40

-20

0

subcarrier

|G(f)

|2

sincRC, a=0.5

TTI Framing Opportunity M2M Sensors

53

LTE 1ms OFDM TTI (here with 4 PRBs)

5G 1ms GFDM TTI 25Bytes generated by a modified SC-FDMA HW!

CONCLUSIONS

Gerhard Fettweis

Requirements / Challenges for 5G PHY

56

scalable bandwidth

f

fragmented spectrum need deep notches

f

packet latency

100s

Multi Carrier

Subcarrier Filters

Compact Packet

New Air Interface:

GFDM

Generalized Frequency Division

Multiplexing

GFDM a Prime Candidate for 5G Flexibility/Parameterization Spectrum Engineering OFDM Compatibility Evolution of OFDM and SC-FDE - Synchronization / Equalization / Clocking Fully MIMO capable ( OFDM and SC-FDE are special cases)

TEAM EFFORT BY Ivan Gaspar, Luciano Mendes, Maximilian Matth, Nicola Michailow, Andreas Festag, Rohit Datta, Martin Danneberg, Dan Zhang

57

5G Realtime Lab Sponsored by

Vodafone Chair Slide 58

Realtime GFDM With -45dB to -65dB Notches

2G 1992 Voice Messages

3G 2002 + Data + Positioning

4G 2012 + Video everything + 3D Graphics

5G 2022 + Tactile Internet + massive M2M + Tb/s + carrier grade + safe & secure

Cellular Roadmap of USPs

Gerhard Fettweis 59

GFDM

Thank you

60

5G Lab Germany

Coordinators: Gerhard Fettweis dresden5GLab.org contact@Dresden5GLab.org Frank Fitzek

Thank You

or 20 years of continued support !

Gerhard Fettweis

Related Publications

For our publications on GFDM:

Overview paper, IEEE Trans. Commun.: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6871292

More than 60 papers: http://scholar.google.com/scholar?start=10&q=GFDM+fettweis&hl=en&as_sdt=0,5

5G and TACTILE INTERNET:

Gerhard Fettweis, and Siavash Alamouti. 5G: Personal Mobile Internet beyond What Cellular Did to Telephony

Communications Magazine, IEEE 52.2 (2014): 140-145.

Gerhard Fettweis "The Tactile Internet: Applications and Challenges."

Vehicular Technology Magazine, IEEE 9.1 (2014): 64-70.

Gerhard Fettweis et al., Tactile Internet, ITU Technology Watch, paper, 2014 http://www.itu.int/en/ITU-T/techwatch/Pages/tactile-internet.aspx

Fettweis et al. Positionspapier Das Taktile Internet, VDE ITG

http://www.vde.com/de/fg/ITG/Seiten/PosiPapTaktilesInternet.aspx

Alcatel-Lucent Foundation, Positionspaper: Das Taktile Internet

http://www.stiftungaktuell.de/wp-content/uploads/2014/07/Positionspapier_Das_Taktile_Internet_final.pdf

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Designing A Possible 5G PHY With GFDMWireless >2020 OutlookThe Tactile InternetAnd Its MillisecondThe Tactile InternetReinventing Latin ClassesPlatooning Foliennummer 14Revolution Ahead: The Tactile Internet5G Massive RequirementsFoliennummer 19Members on TracksRelevant Startups Generated by TeamFoliennummer 22Modulation for cm-Waves1ms Impact: 100s PHY LatencyRequirements / ChallengesThe Subcarrier Time/Frequency DilemmaGFDM Signal PropertiesGFDM Signal PropertiesMulti-Carrier RevisitedOFDM GFDM SC-FDMRealtime 5G Research Testbed: GFDM With -45dB to -65dB Notches ! LTE CompatibilityThe LTE Frame StructureProblems with OFDMProposed Frame StructureOne LTE Symbol Can Host One 5G GFDM PacketTTI Framing Opportunity 100sOQAM in GFDMOQAM in GFDMGFDM A Modulation FrameworkFlexible Spacing Between Subcarriers & SubsymbolsGFDM for Virtualization of 5G Waveform CandidatesMTC?Asynchronous transmissionTTI Framing Opportunity M2M SensorsConclusionsRequirements / Challenges for 5G PHYGFDM a Prime Candidate for 5G 5G Realtime Lab Sponsored by Cellular Roadmap of USPsThank youFoliennummer 61Related Publications