Battle of the Waveforms for 5G GUNES KARABULUT KUR GUNES KARABULUT - - PowerPoint PPT Presentation

▶
battle of the waveforms for 5g
SMART_READER_LITE
LIVE PREVIEW

Battle of the Waveforms for 5G GUNES KARABULUT KUR GUNES KARABULUT - - PowerPoint PPT Presentation

Aug 24, 2022 185 likes •365 views

Battle of the Waveforms for 5G GUNES KARABULUT KUR GUNES KARABULUT KURT, SELAHA , SELAHATTIN GOKCELI TTIN GOKCELI gkurt@itu.edu.tr, gokcelis@itu.edu.tr Wireless Communications and Research Laboratory (WCRL) ISTANBUL TECHNICAL UNIVERSITY ITU

slide-1
SLIDE 1

ITU WCRL

Battle of the Waveforms for 5G

GUNES KARABULUT KUR GUNES KARABULUT KURT, SELAHA , SELAHATTIN GOKCELI TTIN GOKCELI

gkurt@itu.edu.tr, gokcelis@itu.edu.tr Wireless Communications and Research Laboratory (WCRL) ISTANBUL TECHNICAL UNIVERSITY

slide-2
SLIDE 2

ITU WCRL

OUTLINE

h"p://sine.ni.com/cs/app/doc/p/id/cs-17378#

Introduc;on:

OFDM/OFDMA 5G Challenges Waveform Design Targets

Implementa;on Prespec;ve:

Universally Filtered Mul;-carrier (UFMC) Systems Error Performance & Sidelobe levels Further Improvements

Summary IEEE 5G GREECE SUMMIT

2

slide-3
SLIDE 3

ITU WCRL

OFDM/OFDMA

Orthogonal Frequency Division Multiplexing/Orthogonal Frequency Division Multiple Access: Enables transmission of parallel data streams

þ

High data rates

þ

Robustness to frequency selectivity

ý

Sensitivity to time/frequency offsets

ý

High peak to average power ratio (PAPR)

ý

High sidelobe levels

IEEE 5G GREECE SUMMIT

3

slide-4
SLIDE 4

ITU WCRL

5G Challenges

Solutions to OFDM/OFDMA problems:

ê Spectral efficiency ê Energy efficiency

IEEE 5G GREECE SUMMIT

4

slide-5
SLIDE 5

ITU WCRL

5G Challenges

Solutions to OFDM/OFDMA problems:

ê Spectral efficiency ê Energy efficiency

OFDM/OFDMA may not address 5G constraints!

IEEE 5G GREECE SUMMIT

5

slide-6
SLIDE 6

ITU WCRL

5G Challenges

Solutions to OFDM/OFDMA problems:

ê Spectral efficiency ê Energy efficiency

OFDM/OFDMA may not address 5G constraints! New waveforms may be a solu;on

IEEE 5G GREECE SUMMIT

6

slide-7
SLIDE 7

ITU WCRL

Design Targets

é Spectral efficiency é Energy efficiency ê PAPR ê Sidelobe levels

+ Simpler synchronization

IEEE 5G GREECE SUMMIT

7

slide-8
SLIDE 8

ITU WCRL

Candidate Techniques

ü

Filter Bank Multicarrier Modulation [SIOHAN, 2002]

ü

Generalized Frequency Division Multiplexing [FETTWEIS, 2009]

ü

Filtered-OFDM [ABDOLI, 2015]

ü

Zero-tail DFT-spread-OFDM [BERARDINELLI, 2013]

ü

Universal Filtered Multi-Carrier [VAKILIAN, 2013]

ü

…

IEEE 5G GREECE SUMMIT

8

slide-9
SLIDE 9

ITU WCRL

Implementation Perspective

A good compromise: UFMC

þ

Better control of sidelobe levels/interference

þ

Robustness to syncronization sensitivity: Carrier Frequency Offset/Timing Offset

IEEE 5G GREECE SUMMIT

9

X1 N1-IDFT Filtering F1 DAC X2 N2-IDFT Filtering F2 XB NB-IDFT Filtering FB

. . . . . .

Cyclic- Prefix Removal ADC

Synchronization

Filtering/ Channel Equalization Estimated Bits 2N-DFT

TRANSMITTER RECEIVER

slide-10
SLIDE 10

ITU WCRL

SDR Testbed

IEEE 5G GREECE SUMMIT

10

slide-11
SLIDE 11

ITU WCRL

Measurement Results

IEEE 5G GREECE SUMMIT

11

slide-12
SLIDE 12

ITU WCRL

Sidelobe levels (1/2)

IEEE 5G GREECE SUMMIT

12

slide-13
SLIDE 13

ITU WCRL

Sidelobe levels (2/2)

Normalized frequency

  • 0.5
  • 0.4
  • 0.3
  • 0.2
  • 0.1

0.1 0.2 0.3 0.4 0.5

PSD (dBW/Hz)

  • 100
  • 80
  • 60
  • 40
  • 20

20

32 Subcarriers

OFDM DFT-s-OFDM UFMC

IEEE 5G GREECE SUMMIT

13

slide-14
SLIDE 14

ITU WCRL

Further Improvements

Normalized frequency

  • 0.5
  • 0.4
  • 0.3
  • 0.2
  • 0.1
0.1 0.2 0.3 0.4 0.5

PSD (dBW/Hz)

  • 100
  • 80
  • 60
  • 40
  • 20
20

32 Subcarriers

ZP-DFT-s-OFDM ZP-DFT-s-UFMC

X1 M1-DFT Zero Padding N1-IDFT Filtering F1 DAC Precoding X2 M2-DFT Zero Padding N2-IDFT Filtering F2 Precoding XB MB-DFT Zero Padding NB-IDFT Filtering FB Precoding

. . . . . . . . .

TRANSMITTER

Cyclic- Prefix Removal ADC

Synchronization

Filtering/ Channel Equalization Estimated Bits 2N-DFT ML Detection

RECEIVER

IEEE 5G GREECE SUMMIT

14

slide-15
SLIDE 15

ITU WCRL

Summary

  • 1. OFDM & OFDMA are proven techniques
  • 2. Dense networks may require more flexible

waveform design

  • 3. UFMC is a good op;on in terms of its

flexibility

IEEE 5G GREECE SUMMIT

15

slide-16
SLIDE 16

ITU WCRL

Selected References:

IEEE 5G GREECE SUMMIT

16

[SIOHAN, 2002] P . Siohan, C. Siclet and N. Lacaille, "Analysis and design of OFDM/ OQAM systems based on filterbank theory," in IEEE Transactions on Signal Processing, vol. 50, no. 5, pp. 1170-1183, May 2002. [FETTWEIS, 2009] G. Fettweis, M. Krondorf and S. Bittner, "GFDM - Generalized Frequency Division Multiplexing,” IEEE 69th Vehicular Technology Conference, Barcelona, 2009, pp. 1-4. [ABDOLI, 2015] J. Abdoli, M. Jia and J. Ma, "Filtered OFDM: A new waveform for future wireless systems," 2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Stockholm, 2015, pp. 66-70. [BERARDINELLI, 2013] G. Berardinelli, F. M. L. Tavares, T. B. Sørensen, P . Mogensen and K. Pajukoski, "Zero-tail DFT-spread-OFDM signals," 2013 IEEE Globecom Workshops (GC Wkshps), Atlanta, GA, 2013, pp. 229-234. [VAKILIAN, 2013] V. Vakilian, T. Wild, F. Schaich, S. ten Brink and J. F. Frigon, "Universal- filtered multi-carrier technique for wireless systems beyond LTE," 2013 IEEE Globecom Workshops (GC Wkshps), Atlanta, GA, 2013, pp. 223-228

slide-17
SLIDE 17

ITU WCRL

Questions?

Thank you for you a"en;on!

gkurt@itu.edu.tr

IEEE 5G GREECE SUMMIT

17