5G Waveform Techniques - nt.tuwien.ac.at
Transcript of 5G Waveform Techniques - nt.tuwien.ac.at
Dependable Wireless Connectivity for the Society in Motion
Motivation for New 5G Waveforms
FBMC GFDM
UFMC
x-OFDM
Others
Spectral Efficiencyate
ncy
Co
e
Use
r Data
Rate
ility
Requirements
◮ <1ms latency
◮ Mobility
◮ 100 Mbps
◮ 10-100x more devices
◮ Energy efficiency
◮ Low cost
Investigating the most flexible technique!
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Dependable Wireless Connectivity for the Society in Motion
Motivation for New 5G Waveforms
FBMC GFDM
UFMC
x-OFDM
Others
Spectral Efficiencyate
ncy
Co
e
Use
r Data
Rate
ility
Requirements
◮ <1ms latency
◮ Mobility
◮ 100 Mbps
◮ 10-100x more devices
◮ Energy efficiency
◮ Low cost
Investigating the most flexible technique!
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Dependable Wireless Connectivity for the Society in Motion
Content
Filter Bank Multicarrier - FBMC
Universal Filtered Multicarrier - UFMC
Outlook
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Dependable Wireless Connectivity for the Society in Motion
Content
Filter Bank Multicarrier - FBMC
Universal Filtered Multicarrier - UFMC
Outlook
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Dependable Wireless Connectivity for the Society in Motion
FBMC System Model and MMSE Equalizer
CHANNEL+ =
k-1
k
k+1
m-2m-1 m
2Lmax
m+1m+2
k-1
k
k+1
m-2m-1 m m+1m+2
EQUALIZATOR
Neq
2Lmax
k-1
k
k+1
m-2m-1 m m+1m+2
+ =
k-1
k
k+1
m-2m-1 m m+1m+2
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Dependable Wireless Connectivity for the Society in Motion
Results - Impact of Different Lengths of Equalizer
0 5 10 15 20 25 30
SNR in dB
10-2
10-1
100
SE
R
Lmax=3,Neq=6
Lmax=3, Neq=15
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Dependable Wireless Connectivity for the Society in Motion
Results - Impact of Different Lengths of Impulse Response
0 5 10 15 20 25 30
SNR in dB
10-2
10-1
100
SE
R
Lmax=1,Neq=6
Lmax=3,Neq=6
Lmax=1,Neq=15
Lmax=3,Neq=15
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Dependable Wireless Connectivity for the Society in Motion
Results - Impact of Different Velocities
SNR in dB
0 5 10 15 20 25 30
SE
R
10-2
10-1
100
MMSE equalizer with 200 km/h
MMSE equalizer with 400 km/h
one-tap equalzer with 200 km/h
one-tap equalzer with 400 km/h
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Dependable Wireless Connectivity for the Society in Motion
Content
Filter Bank Multicarrier - FBMC
Universal Filtered Multicarrier - UFMC
Outlook
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Dependable Wireless Connectivity for the Society in Motion
UFMC System Model1
◮ Preserved orthogonality between subcarriers
◮ Zero Postfix or Cyclic Prefix avoid ISI
◮ Similar complexity as in CP-OFDM
◮ Possible DFT spreading for PAPR reduction
1R1-165014“Subband-wise filtered OFDM for New Radio below 6GHz“ Nokia, Alcatel-Lucent Shangai Bell,
May 2016
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Dependable Wireless Connectivity for the Society in Motion
Spectral advantages of UFMC
Subcarrier Index0 66 133 200 266 333 400 466 533 600 666 733
PS
D[d
B]
-70
-60
-50
-40
-30
-20
-10
0Bandwidth = 10 MHz
OFDM
UFMC
◮ Improved out-of-subband radiation◮ Better support of fragmented spectrum
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Dependable Wireless Connectivity for the Society in Motion
PAPR Features
PAPR [dB]
0 2 4 6 8 10 12
CC
DF
10-4
10-3
10-2
10-1
100PAPR Comparison between UFMC and OFDM
UFMC without DFT spreading
OFDM
SC-FDMA
UFMC with DFT spreading
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Dependable Wireless Connectivity for the Society in Motion
BER Performance for Different Transmission Modes
0 2 4 6 8 10 12 14 16 18
SNR[dB]
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
Bit E
rro
r R
atio
UFMC
SU SISO AWGN channel
SU SISO flat Rayleigh channel
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Dependable Wireless Connectivity for the Society in Motion
BER Performance for Different Transmission Modes
0 2 4 6 8 10 12 14 16 18 20
SNR[dB]
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
Bit E
rro
r R
atio
UFMC
SU SISO AWGN channel
SU SISO flat Rayleigh channel
SU MISO 2x1 Alamouti
SU SIMO 1x2
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Dependable Wireless Connectivity for the Society in Motion
BER Performance for Different Transmission Modes
0 2 4 6 8 10 12 14 16 18 20
SNR[dB]
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
Bit E
rro
r R
atio
UFMC
SU SISO AWGN channel
SU SISO flat Rayleigh channel
SU MISO 2x1 Alamouti
SU SIMO 1x2
SU MIMO 2x2
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Dependable Wireless Connectivity for the Society in Motion
BER Performance for Different Transmission Modes
0 2 4 6 8 10 12 14 16 18 20
SNR[dB]
10-8
10-7
10-6
10-5
10-4
10-3
10-2
10-1
100
Bit E
rro
r R
atio
UFMC
SU SISO AWGN channel
SU SISO flat Rayleigh channel
SU MISO 2x1 Alamouti
SU SIMO 1x2
SU MIMO 2x2
MU MIMO, NrTx = 3, NrUsers = 3
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Dependable Wireless Connectivity for the Society in Motion
Content
Filter Bank Multicarrier - FBMC
Universal Filtered Multicarrier - UFMC
Outlook
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Dependable Wireless Connectivity for the Society in Motion
Multi-user parameters optimization
Time
Fre
quency
Robust communcation(reduced spectral efficiency)
Low latency, high velocity(high efficiency if L >> K )
Large area(high efficiency if K >> L)
Required time-frequencyresources for one symbol
L ... Number of subcarriers per blockK ... Number of time-symbols per blockF ... Frequency-spacingT ... Time-spacing
F
T ∝1F
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Dependable Wireless Connectivity for the Society in Motion
Outlook
◮ Presence of ICI even for AWGN channel!
◮ Smaller overhead than in OFDM ⇒ Time-frequency efficiency is better!
◮ Tradeoff between time-frequency efficiency and ICI ⇒ optimal length of the filterand number of guard subcarriers?
Thank you for your [email protected]
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Dependable Wireless Connectivity for the Society in Motion
Outlook
◮ Presence of ICI even for AWGN channel!
◮ Smaller overhead than in OFDM ⇒ Time-frequency efficiency is better!
◮ Tradeoff between time-frequency efficiency and ICI ⇒ optimal length of the filterand number of guard subcarriers?
Thank you for your [email protected]
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Dependable Wireless Connectivity for the Society in Motion
References I
Slide 1 / 1