fp7 emphatic project: airbus d&s e - supelec · • high order frequency reuse pattern ... (f),...

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FP7 EMPHATIC project: Airbus D&S

current view and study

- Current PMR status

- Migration problematic and issues

- FMT evolution on 3GPP LTE scheme

Laurent Martinod

07/01/2015

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

PMR legacy systems: actually deployed (Focus on EU case)

The PMR systems considered in EMPhATic project are: • TETRAPOL:

– It is an AIRBUS proprietary PMR system (RUBIS – 1988). – It is a digital narrowband system meant mainly for voice and low data rate transmission. – It is specified in ETSI TETRAPOL PAS – It is following coexistence constraints as defined in ETSI EN 300 113-1 – TETRAPOL is used mainly in 400 MHz band (380-470 MHz)

• TETRA:

– It is a European PMR standard developed by ETSI (1995). – It is a digital narrowband system meant mainly for voice and low data rate transmission. – It is following specifications on coexistence constraints defined in ETSI EN 300 392-2 – TETRA1 (excluding TEDS) is also known as TETRA phase modulation mode – TETRA system can be used in different UHF bands – The main band of interest is 400 MHz band (380-470 MHz)

• TEDS (TETRA2):

– It is an evolution of TETRA European ETSI Standard. – It is a digital wideband system meant for data transmission. – It is following specifications on coexistence constraints defined in ETSI EN 300 392-2 (same as TETRA) – TEDS is also known as TETRA QAM modulation mode (multicarrier modulation scheme) – TEDS system can be used in different UHF bands – The main band of interest is 400 MHz band (380-470 MHz)

9 March 2015

FP7 EMPHATIC project: Airbus D&S current view and study - FMT scheme

2

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

PMR systems: modulation main characteristics

• TETRAPOL: – TETRAPOL Radio System can support a 5 MHz bandwidth corresponding to 500 radio channels of 10

kHz or 400 radio channels of 12.5 kHz (channel spacing). The frequency shift between the uplink and downlink (FDD mode of operation) is constant (duplex spacing): typ. 10 MHz in the UHF band.

– Generally, terminals operate in half-duplex mode – Transmission is organised in Frames of 160 bits, each Frame being transmitted during a 20 ms Time

Interval (equivalent to 160 modulation symbols) in both directions – The modulation type is Gaussian Minimum Shift Keying (GMSK), with parameter BT = 0,25 – The modulation rate is 8 kbit/s. Therefore, the period T is 125 μs

• TETRA / TEDS (TETRA2):

– For phase modulation the modulation scheme is π/4-shifted Differential Quaternary Phase Shift Keying (π/4-DQPSK) or π/8-shifted Differential 8 PSK (π/8-D8PSK)

– The modulation rate is 36 kbit/s for π/4-DQPSK (TETRA1) – The modulation rate is 54 kbit/s for π/8-D8PSK (specific TEDS 8 states Phase modulation case)

– For QAM (TEDS or TETRA2) the modulation scheme is 4-QAM, 16-QAM or 64-QAM. A multi sub-carrier

approach with 8 sub-carriers per 25 kHz is used, i.e. 8, 16, 32 and 48 sub-carriers in 25 kHz, 50 kHz, 100 kHz and 150 kHz carriers respectively.

– The modulation symbol rate on each sub-carrier is 2 400 symbols/s

9 March 2015


3

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Principal frequency band in Europe

380-385 / 390-395 MHz

10 MHz FDD Duplex

Other sub-bands are defined in 400 MHz band: 410-430 MHz and 450-470 MHz (with same FDD Duplex)

9 March 2015


4

380 385 390 395

PMR Band

UL DL

MHz

10 to 25 kHz

10MHz

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

PMR specific needs (services)

Overall system architecture very similar to cell-based public radiocommunication systems

(GSM/…) but:

- Establishment time reduced to minimum

- Group call / conference

- Priority call / preemption

- Emergency call

- E2E encryption (cyphering in the handheld)

- DMO (Direct Mode Operation)

- Push to Talk

- Very low datarate vocoder (down to 2.45kbits/s, ex. AMBE)

- Very wide cell range (proprietary radio network)

- …

9 March 2015


5

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Cell-based radio planning

• High order frequency reuse pattern (> 12)

• Scarcely used spectrum

• Up to 24 channels per radio site

(TTPOL)

9 March 2015


6

1 2

3

Spectrum used by

NB network in cell

#2

Spectrum used by

NB network in cell

#1

Spectrum used by

NB network in cell

#3

Overall spectrum (Cells 1 to 3)

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

PMR specifications: far more stringent requirements

PMR radio specifications and requirements are far more stringent than 3GPP LTE for example

Example of blocking characterisics required

RX: TETRAPOL MS RX Mask LTE 1.4 MHz bandwidth UE RX Mask

9 March 2015


7

Blocking (dB)

0

10

20

30

40

50

60

70

80

90

100

110

-10 -8 -6 -4 -2 0 2 4 6 8 10

Frequency Offset (MHz)

Mask (

dB

c)

Mask of Blocking Response

0

10

20

30

40

50

60

70

-16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16

Frequency Offset (MHz)

Min

. R

eq

uir

em

en

t (d

Bm

)

Mask (dB)

ACS 40dB

ACS + NB Blocking 40dB

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Evolutions and context: higher datarates needed

Hence the following important services that are of WB and BB nature cannot be supported by these networks:

• video conferencing;

• video streaming (CCTV on scene);

• full Satellite Navigation (AVLS works well on narrowband but not as comprehensive);

• passport and bio-metric checks (secure information) undertaken remotely as this requires data rates just

above those available on narrowband;

• improved on-line access to contacts data base that can be shared to know all those organisations /

people that should be contacted depending on, for example, the incident;

• full e-mail;

• intranet browsing;

• improved transfer of files (maps and pictures);

• improved transfer of medical information;

• ability to move the back office into the field;

• Increased over the air key programming downloads of new software updates. Allows the staff to be kept

operational which could be a significant cost and operational benefit;

• Biometric monitoring;

• …

9 March 2015


8

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Evolutions and context: migration towards broadband

These services require much higher data rates than currently deployed PMR PPDR systems.

• Broadband techniques using bandwidths in the range of 1.4, 3, 5 MHz bandwidth such as LTE enable high data

rates transmissions and demanding PPDR data applications.

• It shall be noted that these services have to be provided on dedicated networks in order to ensure the access to

the network even in Disaster conditions when commercial networks are out of order due to congestion.

• The introduction of new broadband PMR technologies for broadband requires new available capacity for such

usage.

There are two ways to increase the capacity:

• Allocate new frequency bands to Public Safety usage (PPDR applications) below 1 GHz for economical

reasons linked to the propagation conditions that are much better in UHF frequency range in order to enable

sufficient territorial coverage with a limited number of Base Stations. Not for tomorrow !

• Improve spectrum efficiency of PMR PPDR systems in the bands that are already allocated to PMR (i.e.

bands for PPDR: 380-385/390-395 MHz, and other bands allocated to PMR: 430-450 MHz band and 450-

470 MHz band). The goal is then to improve broadband technologies and to enable coexistence in the same

band of current (narrowband) technologies and new broadband technologies by inserting broadband in

bands already deployed with narrowband systems and networks.

The objective of EMPHATIC project is to study techniques especially on the lower layer that enable intrinsic

better spectrum efficiency of broadband systems and their cohabitation with narrowband systems in the same

band.

9 March 2015


9

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

9 March 2015

BB system introduction into NB world

Typical cases and generic one

10


10

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

3GPP LTE as a candidate: this is not straightforward

• CP-OFDM poor spectral containment (high adjacent side-lobes)

• Blanking RBs is not the solution: the spectrum is not cleared

9 March 2015


11

Empty RB

LTE constellation

LTE spectrum

Reserved area

3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6

x 106

-60

-40

-20

0

20

40

PS

D (

dB)

Frequency (Hz)

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Proposed solution: evolved 3GPP LTE Layer 1 using pulse shaping

• Replace CP-OFDM by Filter Bank Multi-Carrier (FBMC) modulation: EMPHATIC purpose

• Our own contribution: FMT usage

• Frequency Multi Tone (FMT) : filter bank composed of non overlapping filters

(or with slight overlapping) – frequency domain

• Main idea: suppress temporal OFDM CP, and use an equivalent guard interval in the

frequency domain

• Iso radio resources, Fs unchanged, frame structure remains identical, …

• Main advantage: spectrum shaping

• Main drawback: temporal support of the pulse shaping function (delay)

9 March 2015


12

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

What could it look like ?

First view and comparison between classical 3GPP LTE and evolved LTE with FMT

implementation

LTE spectrum in blue and FMT LTE spectrum in red

Overall spectrum Zoom on blank sub-carriers

9 March 2015


13

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT characteristics: some maths

• FMT BB signal:

– M is the number of sub-carriers,

– N is the number of modulated symbols on each sub-carrier,

– T is the symbol duration on each sub-carrier

– g(t) is the ideal symbol waveform, obtained by the inverse Fourier transform of a square root raised cosine

spectrum G(f), defined as follows:

– Thus:

9 March 2015


nnnm tjttg(n)Sts

.exp.. )(1-M

0m

N

1n

TffG

TfTTffG

TffG

2/)1(for0)(

2/)1()/2-(1for 2/)12sin1(*5.0 ) (

)/2-(1for1)(

4,)

4cos()

21()

4sin(

21

2

])4(1[

)]1(cos[4)]1(sin[

0,41

)(2

u

uu

uuu

Tt

T

t

T

t

T

t

T

t

T

t

t

tg

14

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

3GPP LTE reminder: main PHY parameters (BW definition)

9 March 2015


15

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

3GPP LTE DL physical channels reminder

9 March 2015


16

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

3GPP LTE and FMT main parameters

• Classical 3GPP LTE figures, and new parameters:

• Goal: keep 3GPP LTE parameters unchanged !

• FMT implementation is transparent for 3GPP upper layers.

9 March 2015


• Configuration parameters • 3GPP LTE Standard + FMT

• Basic modulation access mode • OFDMA (downlink mode)

• Frequency carrier • 450 MHz

• Bandwidth • 1.4 MHz

• FFT size (Nfft) • 128

• Sampling Frequency • 1.92 MHz

• Sub-carrier spacing (∆f) • 15 kHz

• CP • 512/2048=1/4

• Symbol duration • 160 samples: Nfft(1+CP)

• Number of used sub-carriers (Nused) • 72 (6 RBs)

• Pulse shaping filter size • L*(Nfft+CP))

• Roll-off factor • Alpha Tx / Rx

17

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT advantage: spectrum behaviour

example – carrier blanking

• As an example: one subcarrier is dismissed

- Adjacent sub-carrier rejection = -49dB (FMT) vs -10dB (CP-OFDM)

- Pulse shaping filter characteristics: L = 8, alpha = 0.35

9 March 2015


-5.8 -5.6 -5.4 -5.2 -5 -4.8 -4.6 -4.4 -4.2

x 105

-80

-70

-60

-50

-40

-30

-20

-10

0

Frequency

Magnitude (

dB

)

Filtered LTE signal with blank sub-carrier

OFDM

FMT

Unused OFDM subcarrier

Unused FMT subcarrier

18

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT drawback: ICI / limited pulse shaping temporal support

example – EVM at receiver side (no propagation channel)

• Depending on temporal pulse shaping length and truncation, EVM could be not negligible

(ideal case – no propagation channel):

9 March 2015


-1.5 -1 -0.5 0 0.5 1 1.5-1.5

-1

-0.5

0

0.5

1

1.564 QAM symbols, L=6, Alpha= 0.33, EVM=0.041

-1.5 -1 -0.5 0 0.5 1 1.5-1.5

-1

-0.5

0

0.5

1

1.564 QAM symbols, L=7, Alpha=0.33, EVM=0.02

-1.5 -1 -0.5 0 0.5 1 1.5-1.5

-1

-0.5

0

0.5

1

1.564 QAM symbols, L=18, Alpha=0.23, EVM=0.003

19

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT: parameters choice (EVM and rejection criteria)

• EVM depending on roll-off factor (asymmetric roll-off factor: Rx / Tx pulse shaping filters)

• Filter length = 12 OFDM symbols (1 LTE sub-frame)

• Optimal point: (AlphaTx: 0.22, AlphaRx: 0.18) => Rejection: 48.7dB, EVM: 1.0%

9 March 2015


alphaTx

alp

haR

x

EVM with filter length:12, 64QAM, 1 subcarrier removed

0.2 0.25 0.3 0.35 0.4 0.45

0.2

0.25

0.3

0.35

0.4

0.015

0.02

0.025

0.03

0.035

0.04

0.045

0.2 0.25 0.3 0.35 0.4 0.45 0.543

44

45

46

47

48

49

50Rejection with filter length:12, 64QAM, 1 subcarrier removed

alphaTx

20

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT modulator - basics

9 March 2015


Pulse Shape

Filter h (t)

e j

0 t

tx

Subchannel 0

Subchannel

Symbol

Generator

Pulse Shape

Filter h (t)

e j t 1

tx

Subchannel 1

Subchannel

Symbol

Generator

Pulse Shape

Filter h (t)

e j t N-1

tx

Subchannel N-1

Subchannel

Symbol

Generator

+

Zero IF

Modulation

Data Input 0

Data Input 1

Data Input N-1

k bits

k bits

k bits

21

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

Our FMT implementation: overlap-add in the temporal domain

9 March 2015


IDFT + replication

overlap-add with previous FMT symbols

M.m bits

bits/ symbols

mapping

M symbols

demultiplexing on M subcarriers

0

M -1 .. .. .. .. .. .. .. ..

.. .. .. .. .. ..

.. ..

.. ..

.. ..

.. ..

.. ..

.. ..

.. ..

IDFT

+ replication

time

time

Filter h (t) tx

Filter h (t) tx

time 22

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

MATLAB LTE / FMT PHY simulation:

overall synoptic (DL case)

• Complete PHY layer simulation available:

Synchronization in time and frequency is perfect !

9 March 2015


Data

bits

CHANNEL CODING

CRC

encoder

Rando-

mizer

FEC

encoder

Inter-

leaver

Rate

mat-

ching

SYMBOL

QAM

mapper

MIMO

MIMO

encoder

BURST MAPPING

PHY-channel

mapping

PN seq.

generator

Pilots

insertion

Frame

structure

OFDM

IFFT

CP

insert.

PROPAGATION CHANNEL

Multiple

paths Delays Uncorrelated

fadings

Multiple paths

summation

AWGN

FFT

CP

remove

OFDM

INIT

MIMO decoder

&

Channel

estimation

Channel

compensate

PHY-channel

demapping

Pilots

removal

QAM

Demod.

Received

Data bits

CRC

decoder

Derand-

omizer

FEC

decoder

Deinter-

leaver Rate

demat-

ching

BER/FER

calculation

+ EVM

FMT FMT

23

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

MATLAB LTE PHY simulation: propagation channel model

What is this for ?

Radio-communications context

Moving UEs

Physical phenomena during propagation

9 March 2015


24

UE#1

Base

Station

UE#2

Cell B

Cell A

A: free space

B: reflection

C: diffraction

D: scattering

E: shadowing

F: Doppler

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

MATLAB LTE PHY simulation: propagation channel model

Example of multipath fading channel models:

• HT200: Hilly Terrain environment and 200km/h mobile speed 6 multi-paths with Rayleigh fading channel

and following characteristics

• Representation

in time and frequency plan

(example): amplitude only

• Due to UHF high temporal delay spread

Extended CP configuration case is

mandatory

9 March 2015


25

Path 1 2 3 4 5 6

Delay( s ) 0.0 0.1 0.3 0.5 15.0 17.2

Attenuation (dB) 0.0 -1.5 -4.5 -7.5 -8.0 -17.7

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

MATLAB 3GPP LTE / FMT PHY simulation:

3GPP LTE DL physical channels overview (reused with FMT scheme)

9 March 2015


26

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT vs LTE simulation results – AWGN SISO

9 March 2015


Perfect channel estimation Real MAP channel estimation

27

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT vs LTE simulation results – dynamic EVA 50 SISO

9 March 2015


28

Perfect channel estimation Real MAP channel estimation

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT tests: HPA linearity and spectrum regrowth experiments

Several waveforms generated with the following characteristics and feeding Base Station HPA:

• Fs = 7.68Msamples/s

• No Crest Factor reduction is applied (as a consequence, PAPR is roughly 12dB)

• Modulation = 64QAM

• BW = 1.4MHz (6 RBs)

• Two RBs are blanked

CP-OFDM 3GPP LTE waveform

1st FMT waveform:

L = 6, roll-off = 0.25

(ACP rejection ~ 40dB)

2nd FMT waveform:

L = 12, roll-off = 0.25

(ACP rejection ~ 60dB)

9 March 2015


29

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

FMT tests: HPA linearity and spectrum regrowth experiments

Experiment with real RF hardware

(HPA base station output)

using the 2nd FMT waveform

• blue curve = HPA base station

output (@ max power output

+48dBm ~ 60W)

• black curve = R&S SMU200

output (reference measurement)

We do no need to have

more stringent specifications !

9 March 2015


30

Confidential

© 2

014 A

irbus D

efe

nce a

nd S

pace –

All r

ights

reserv

ed. T

he r

epro

duction, dis

trib

ution a

nd u

tilization o

f th

is d

ocum

ent as w

ell a

s t

he c

om

munic

ation o

f its c

onte

nts

to o

thers

without expre

ss a

uth

ori

zation is

pro

hib

ited. O

ffenders

will be h

eld

lia

ble

for th

e p

aym

ent of dam

ages. A

ll r

ights

reserv

ed in

the e

vent of th

e g

rant of a p

ate

nt,

utility

model o

r desig

n.

9 March 2015

Thank you for your attention!

Questions ?

31


31

fp7 emphatic project: airbus d&s e - supelec · • high order frequency reuse pattern ... (f),...

Documents