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S UB -TH Z S PECTRUM AS E NABLER FOR 6G W IRELESS C OMMUNICATIONS UP TO 1 T BPS 2 6 M a r c h 2 0 1 9 , 6 G w i r e l e s s S u m m i t , L e v i , F i n l a n d Yo a n n C o r re , J - B . D o r , M . S a a d , E . Fa u s s u r r i

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SUB-THZ SPECTRUM AS ENABLER FOR 6G WIRELESS COMMUNICATIONS UP TO 1 TBPS

2 6 M a r c h 2 0 1 9 , 6 G w i r e l e s s S u m m i t , L e v i , F i n l a n d

Yo a n n C o r re ,

G . G o u g e o n J - B . D o r é , S . B i c a i s , B . M i s c o p e i n M . S a a d , J . Pa l i c o t ,

F. B a d e r

E . Fa u s s u r r i e r

SLIDE 2

2

INTRODUCTION

BRAVE project

Funded by French Research Agency (ANR)
2018 - 2021
1.5 M€

Explore new radio technologies (waveform, topology, …) to operate at frequencies above 5G spectrum

Research lab Spectrum regulator Academic lab Industry

26 March 2019, 6G wireless Summit, Levi, Finland

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3

SPECTRUM OPPORTUNITIES

100 GHz 120 GHz 140 GHz 160 GHz 180 GHz 200 GHz

92 - 115 GHz 130 - 175 GHz

Range of interest: [90 – 200] GHz Today: mainly scientific services

Astronomy observations, Earth

exploration, Sat communications, Meteorology…

Huge bandwidth potential

58.6 GHz already allocated for fixed

and mobile services by the Radio Regulation (RR)

W and D bands: Already some

industrial interest, and CEPT recommendationsreleased

D band

26 March 2019, 6G wireless Summit, Levi, Finland

W band

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4

EARLY VISION FOR B5G SUB-THZ COMMUNICATIONS

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5

EARLY VISION FOR B5G SUB-THZ COMMUNICATIONS

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6

DEFINITION OF SCENARIOS – ONE EXAMPLE: KIOSK

Restricted to DL DP at very-high data rate All scenarios described in BRAVE D1.0

Scenario parameters System & performance requirements

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7

Technical PHY related challenges that are adressed by the project

1.

Model & simulate the radio propagation channel

2.

Model & simulate RF impairments (typically: Phase noise, non-linearities)

3.

Define & evaluate new appropriate waveforms

4.

Define & evaluate efficient modulation and detection schemes

5.

Assess the feasibility & performance of some applications

6.

Demo

TECHNICAL CHALLENGES

No hardware development Evaluations are performed based on analytical studies & simulations

Exploration step

26 March 2019, 6G wireless Summit, Levi, Finland

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8

PROPAGATION CHANNEL MODELLING

Main channel properties (incl. MIMO)? Communication ranges? Isolation or Interference levels? Impact of antenna beamwidth, mis-alignment, body blockage…? Channel samples for design of new air interface

26 March 2019, 6G wireless Summit, Levi, Finland

SLIDE 9

9 ITU models for atmospheric effect, rainfall loss,

materials, building entry loss, and vegetation loss

When needed: Frequency extrapolation used as a

first approximation

PROPAGATION CHANNEL MODELLING

SLIDE 10

10 Using Ray-based models

Today tuned in 5G mmWave bands

Get channel statistics and samples

PROPAGATION CHANNEL MODELLING

Backhaul ray-paths @150 GHz Coverage map @150 GHz × Many Links

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11

PROPAGATION CHANNEL MODELLING

HPBW 20°

Indoor ray-paths NLoS Delay spread# @Low noise NLoS Delay spread# @High noise

HPBW 6° # Delay spread measured from 30-dB channelresponse range

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12 Why BRAVE decided to look at single-carrier waveforms?

1. Favorable propagation is expected (i.e. towards frequency flat) 2. Lower PAPR (Peak to Average Power Ratio) can be achieved 3. Modulations robust to Phase noise can be implemented 4. Adequate sub-band division to be found

SINGLE-CARRIER WAVEFORM

Multi-carrier OFDM suffers from non-linear distortion and poor efficiency at HPA. Efficiency of CMOS-based HPA decreases at higher frequencies. Channel sparsity. Narrow antenna beam. Phase Noise is due to non-stationarity in the Local Oscillator (LO), and becomes a major limitation in sub-THz communications. Band-limited A2D.

26 March 2019, 6G wireless Summit, Levi, Finland

Revisiting 5G NR waveform is mandatory!

SLIDE 13

13 Constant or near-constant envelop modulations

For instance: CPM (Continuous Phase Modulation)
At the cost of lower spectral efficiency (SE)
But compensated by Index Modulation (IM) e.g. Generalized Spatial Modulation (GSM)

SC + CPM + IM waveform Balance between SE, EE, HW cost and detection complexity

ELABORATION OF ADEQUATE WAVEFORMS

Q I GSM transceivers

Phase trajectory

SLIDE 14

M-PSK regions vs SNR and Phase Noise

variance

²

EFFECT OF THE PHASE NOISE (PN) VARIANCE

Low PN Higher PN

Accurate PN modelling

PSD of a 200 GHz oscillator

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15

EFFECT OF THE PHASE NOISE (PN) VARIANCE

Modulations tailored for PN channel

Low PN Higher PN Coherent vs Non-coherent Polar receiver

SLIDE 16

16 Continue PHY modelling work Consider realistic antenna capabilities Plug together the PHY models and the proposed waveform/modulation schemes Explore different operating modes

Ultra high data rate, at cost of complex architecture and heavy power consumption
Lower spectral efficiency, but compliant with low-cost low-power devices

Propose 5GNR waveform amendments compatible with sub-THz channel

constraints

NEXT STEPS

26 March 2019, 6G wireless Summit, Levi, Finland

SLIDE 17