performance comparison of new waveforms applied …

Université de Mons

[1] V. Vakilian, T. Wild, F. Schaich, S.T. Brink and J-F. Frigon, "Universal-Filtered Multi-Carrier technique for wireless systems beyond LTE", Globecom workshop, 2013.[2] A-C Honfoga, T. T. Nguyen, M. Dossou and V. Moeyaert, “Application of FBMC to DVB-T2: a comparison vs classical OFDM transmissions,” IEEE GlobalSIP conference, 2019.[3] European Broadcasting Union, “Digital Video Broadcasting (DVB); implementation guidelines for a second generation digital terrestrial television broadcasting system (DVB-T2),” ETSI TS 102 831 V1.2.1, 2012.

REFERENCES

PERFORMANCE COMPARISON OF NEW WAVEFORMS APPLIED TODVB-T2 TRANSMISSIONS

CONCLUSIONS

SIMULATION RESULTS AND DISCUSSIONS

Anne-Carole Honfoga

Electromagnetism and Telecommunications Department

University of Mons, Mons, Belgium

anne-carole.honfoga@umons.ac.be

SYSTEM IMPLEMENTED, METHOD AND PARAMETERS

THEORICAL BACKGROUND

OFDM

System implemented Simulation parameters Fading channel, method

Waveforms PSD Discussions

CONTEXT ACHIEVEMENTS OF THIS WORK

Anne-Carole HONFOGA (anne-carole.honfoga@umons.ac.be)

FILTERED BASED WAVEFORMS COMPARISONUFMC FBMC

BER after LDPC decoder

Michel DossouLETIA (of Polytech,Sch,of Abomey-Calavi)

University of Abomey-Calavi, Calavi, Benin

michel.dossou@epac.uac.bj

Digital Video Broadcasting – Terrestrial_second-generation (DVB-T2) is theEuropean terrestrial digital broadcasting standard which presents a high flexibilityand performance (when compared to the first-generation DVB-T).

DVB-T2 system has been the object of many research during the last decade.

Improvement of DVB-T2 system performance by substituting OrthogonalFrequency Division Multiplexing (OFDM) waveform by proposed 5G waveforms,Universal Filtered Multicarrier (UFMC) and Filter Bank Multicarrier (FBMC).

Choice of the 5G waveform more effective for DVB-T2 transmission.

Véronique Moeyaert

Electromagnetism and Telecommunications Department

University of Mons, Mons, Belgium

veronique.moeyaert@umons.ac.beINTRODUCTION

S/P

conversion

P/S

conversion

Inverse Fast

Fourier

Transform

(IFFT)

CP

adding

P/S

conversionChannel

Fast Fourier

Transform

(FFT)

CP

cancelingP/S

conversion

AWGN

Complex

symbols

Input

signal

Complex

symbols

Output

signalSub-

channel

equalizer

+

IFFT

N

.

.

.

.

.

Filter 2 ∑ Channel

+ AWGN

S/P

S/PZeros

Padding

FFT

2N

Down

Sampling

2

P/SComplex

symbols

Sub-

channel

equalizer

Filter 1

Filter B

IFFT

N

IFFT

N

.

.

S/P

S/P

Input

signal Complex

symbols

Input

signal Complex

symbols

Input

signal Complex

symbols

.

...

S/P

conversion

Inverse Fast

Fourier Transform

(IFFT)

Polyphase

Network

(PPN)

P/S

conversion

Offset – Quadrature

Amplitude

Modulation (O-

QAM)/ Pre-

processing

Synthesis Filter Bank (SFB)

Channel

Input

signal

P/S

conversion

Fast

Fourier

Transform

(FFT)

Polyphase

Network

(PPN)

S/P

conversion

Offset – Quadrature

Amplitude

Modulation (O-

QAM)/ Post-

processing

AWGN+

Output

signal Sub-

channel

equalizer

Analysis Filter Bank (AFB)

Real

symbols

Real

symbols

Inverse Fast Fourier Transform (IFFT)/FFT

M subcarriers B sub-bands 2M subcarriers

Use of Cyclic Prefix (CP) Yes No No

Guard Band size Large Short No Guard Band

Prototype filter, Filter length Rectangular, Short Dolph-Chebychev, Very short PHYDYAS, Long

Filtering operation On the whole band Per sub-band Per subcarrier

FBMC and UFMC are compared to OFDM in DVB-T2 system in terms of spectral efficiency, Power Spectral Density (PSD), performance gain and complexity.

A compromise has been established between these criteria and shows that UFMC is the good compromise

The choice of FBMC in DVB-T2 system induces a high spectral efficiency and a better performance gain but with a cost of complexity

UFMC induces a medium spectral efficiency and a noticeable performance gain with a complexity comparable to that for OFDM Il is the best compromise

Random bits

generatorLDPC Encoder

QAM

Mapper

OFDM

(IFFT)

Cyclic Prefix

insertion

Fading

channel

Cyclic Prefix

deletion

OFDM

(FFT)

QAM

Demapper

LDPC

Decoder

BER BER

+ AWGN

FBMC and UFMC waveforms

substitution

Sub-Channel

equalizer

Zero Forcing CFIR 3 tapsUFMC

OFDM

FBMC

Parameters OFDM UFMC FBMC

M 1024|32768 1024|32768 1024|32768

Data sub-carriers 853|27841 936|29952 1024|32768

QAM 256-QAM 256-QAM 256-QAM

Code rate 3/5 3/5 3/5

Cyclic prefix 1/128|1/16 -- --

Overlapping factor -- -- 4

Filter length -- K*CP=64|256 K*2M=8192|262142

Sub-band number -- 4|128 --

Sub-band bandwidth -- 234 --

Side Lobe Level -- 40|60dB --

Typical Urban 6 channelis the channel whichemulates DVB-T2 urbanenvironment andincludes only a Non Lineof Sight (NLOS) path.

The waveforms PSD havebeen first simulated.

The BER after QAMdemapper and Low-Density Parity Check(LDPC) have beencomputed

UFMC presents the worst performance when sub-band number is very low and the filter length isvery long.

When the subcarrier and the sub-band number ishigh and the filter length is short, UFMCperformance becomes better than that for OFDM.

Both FBMC and UFMC are suitable for DVB-T2

FBMC outperforms OFDM for any subcarriernumber whereas UFMC outperforms OFDM forsome configuration parameters.

With FBMC, a multi-taps equalizer Complex FiniteImpulse Response (CFIR 3-taps) is needed to getthese performance whereas with UFMC, only zeroforcing equalizer used in OFDM is needed.

CFIR 3-taps are more complex than zero forcing.

FBMC outperforms UFMC which in turn outperforms OFDM. At a BER of 10−3, FBMC and UFMC outperform OFDM respectively by 1 dB and 1.2 dB SNR. UFMC cansubstitute OFDM with a high spectral efficiency (128% improvement) due to the CP cancellation, its little guard band and the performance gain obtained. FBMC cansubstitute OFDM with a high spectral efficiency (133% improvement) due to the CP cancellation, the absence of the guard band and the performance gain obtained. UFMCcould be the waveform suitable to DVB-T2 transmission due to the complexity of implementation which is comparable to that for OFDM.

Waveforms OFDM FBMC UFMC/ SLL 60 dB UFMC/ SLL 60 dB

BER 10−3 10−3 10−3 10−3

SNR 32 31 31 30.8