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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 Martinod 07/10/2014. Current status. Deliverables:

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laurent martinod 07 10 2014

PROFIL project: Airbus D&S current status and FMT scheme overview- Current status- FMT scheme definition- FMT simulation based on 3GPP LTE one

Laurent Martinod

07/10/2014

current status
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewCurrentstatus
  • 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…
bb system introduction into nb world typical cases and generic one
BB system introduction into NB worldTypical cases and generic one

PROFIL project: Airbus Defence & Space current status and FMT scheme overview

  • 3
fmt characteristics some maths
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewFMT 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:
3gpp lte and fmt main parameters
PROFIL project: Airbus Defence & Space current status and FMT scheme overview3GPP 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.
fmt advantage spectrum behaviour example carrier blanking
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewFMT advantage: spectrum behaviourexample – 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

OFDM

Unused OFDM subcarrier

FMT

Unused FMT subcarrier

slide7
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewFMT 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):
fmt parameters choice evm and rejection criteria
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewFMT: 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%
fmt modulator basics
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewFMT modulator - basics

Subchannel 0

Subchannel

k bits

Pulse Shape

Symbol

Data Input 0

Filter h (t)

Generator

tx

w

j

t

0

e

Subchannel 1

Subchannel

k bits

Pulse Shape

Symbol

Data Input 1

Filter h (t)

Generator

tx

Zero IF

Modulation

+

w

j

t

1

e

Subchannel N-1

Subchannel

k bits

Pulse Shape

Symbol

Data Input N-1

Filter h (t)

Generator

tx

w

j

t

N-1

e

our fmt implementation overlap add in the temporal domain
PROFIL project: Airbus Defence & Space current status and FMT scheme overviewOur FMT implementation: overlap-add in the temporal domain

demultiplexing

on

M

subcarriers

M

-1

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

bits/

symbols

0

mapping

IDFT +replication

M

symbols

M.m

bits

IDFT

+

replication

Filter h (t)

tx

Filter h (t)

time

time

time

tx

overlap-addwith

previous FMT symbols

matlab lte fmt phy simulation overall synoptic dl case

BURST MAPPING

PN seq.

generator

PHY-channel

mapping

Pilots

insertion

Databits

CRC

encoder

Rando-mizer

FEC

encoder

Inter-

leaver

Ratemat-ching

QAM

mapper

MIMO

encoder

Frame

structure

CHANNEL CODING

SYMBOL

MIMO

INIT

IFFT

OFDM

AWGN

Multiple paths

summation

Uncorrelatedfadings

Multiple paths

CPinsert.

Delays

CPremove

OFDM

PROPAGATION CHANNEL

FFT

Deinter-

leaver

Channel

compensate

Pilots

removal

PHY-channel

demapping

QAM

Demod.

Ratedemat-ching

MIMO decoder

&

Channel

estimation

BER/FER

calculation

+ EVM

Received

Data bits

CRC

decoder

Derand-omizer

FEC

decoder

PROFIL project: Airbus Defence & Space current status and FMT scheme overview

MATLAB LTE / FMT PHY simulation: overall synoptic (DL case)
  • Complete PHY layer simulation available:
  • Synchronization in time and frequency is perfect !

FMT

FMT

thank you for your attention
Thank you for your attention!

Questions ?

PROFIL project: Airbus Defence & Space current status and FMT scheme overview

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