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PROFIL project: Airbus D&S current status and FMT scheme overview- Current status- FMT scheme definition- FMT simulation based on 3GPP LTE one
Laurent Martinod07/10/2014
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Current status
Deliverables:• L0.1: finalized and shared with partners. Waiting for official Template to update the final version.• L1.1: first draft available. Contribution from CEA to include. Review will follow.• L2.1: Airbus DS contribution on FMT to include.
FMT study current status:• FMT pulse shaping choice and design: specifications issued from our own contribution to Emphatic project• Tx/Rx modulator/demodulator parts implemented (C and Matlab)• Complete SISO Tx/Rx chain with BER performances metrics based on existing LTE simulator: developed,
validated and now fully available in order to be able to compare results using similar structures (LTE vs FMT)• Dynamic propagation channel included (for both ideal and real channel estimation algorithms) – SISO case• Replace LTE OFDM scheme by FMT one without changing existing 3GPP LTE physical channels: OK• See next slides, …
FMT study future steps:• Add more complex antenna configuration cases (SIMO, MISO)• Compare performances in different configurations…
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
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07 October 2014
BB system introduction into NB worldTypical cases and generic one
3
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
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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:
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
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
Tt
Tt
Tt
Tt
Tt
t
tg
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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.
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
• 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*NFFT=1/4
• Symbol duration • 160 samples: Nfft+CP
• Number of used sub-carriers (Nused) • 72 (6 RBs)
• Pulse shaping filter size • L*(Nfft+CP))
• Roll-off factor • Alpha Tx / Rx
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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
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
-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
Mag
nitu
de (
dB)
Filtered LTE signal with blank sub-carrier
OFDM
FMT
Unused OFDM subcarrier
Unused FMT subcarrier
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ithou
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pres
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izat
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is p
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FMT drawback: ICI / limited pulse shaping temporal supportexample – 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):
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
-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
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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%
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
alphaTx
alph
aRx
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
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FMT modulator - basics
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
Pulse Shape
Filter h (t)
ejw0 t
tx
Subchannel 0
SubchannelSymbol
Generator
Pulse Shape
Filter h (t)
ejw t1
tx
Subchannel 1
SubchannelSymbol
Generator
Pulse Shape
Filter h (t)
ej w tN-1
tx
Subchannel N-1
SubchannelSymbol
Generator
+
Zero IF
Modulation
Data Input 0
Data Input 1
Data Input N-1
k bits
k bits
k bits
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izat
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Our FMT implementation: overlap-add in the temporal domain
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
IDFT + replication
overlap-add withprevious FMT symbols
M.m bits
bits/symbolsmapping
Msymbols
demultiplexing on M subcarriers
0
M-1 .... ........ ....
.... .... ....
............
....
............
IDFT+
replication
time
time
Filter h (t)tx
Filter h (t)tx
time
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pres
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izat
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MATLAB LTE / FMT PHY simulation: overall synoptic (DL case)
• Complete PHY layer simulation available:
Synchronization in time and frequency is perfect !
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
Databits
CHANNEL CODING
CRCencoder
Rando-mizer
FECencoder
Inter-leave
r
Ratemat-
ching
SYMBOL
QAMmapper
MIMO
MIMOencoder
BURST MAPPING
PHY-channelmapping
PN seq.generator
Pilotsinsertion
Framestructure
OFDM
IFFT
CPinsert.
PROPAGATION CHANNEL
Multiple paths
DelaysUncorrelatedfadings
Multiple pathssummation
AWGN
FFT
CPremove
OFDM
INIT
MIMO decoder&
Channelestimation
Channelcompensate
PHY-channeldemapping
Pilotsremoval
QAMDemod.
ReceivedData bits
CRCdecoder
Derand-omizer
FECdecoder
Deinter-leaver
Ratedemat-ching
BER/FERcalculation
+ EVM
FMT FMT
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MATLAB 3GPP LTE / FMT PHY simulation: 3GPP LTE DL physical channels overview (reused with FMT scheme)
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
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FMT vs LTE simulation results – AWGN SISO
07 October 2014
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
Perfect channel estimation Real MAP channel estimation
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07 October 2014
Thank you for your attention!
Questions ?
14
PROFIL project: Airbus Defence & Space current status and FMT scheme overview
