technologies for future mobile transport networks
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Technologies for future mobile transport networks
Pham Tien Dat1, Atsushi Kanno1, Naokatsu Yamamoto1, and Tetsuya Kawanishi1,2
1National Institute of Information and Communications Technology, Japan2Wasdea university, Tokyo, Japan
FG IMT-2020 Workshop and Demo Day: Technology Enablers for 5G
Outline
Flexible fiber-wireless mobile fronthaul
• Downlink system
• Bidirectional transmission
Seamless fiber-wireless for moving cells
Multiple radios over fiber system
Conclusion
2
Flexible fiber-wireless transport systems
BBU BBU BBU
BBU pool
Core network
MUX/DEMUX
Control office
MUX/DEMUX
RRH
RRH
RRH RAU RAU RAU
3
Fiber-wireless convergence
Seamless optical and MMW connection: Low latency, low power
RAU
DigitalE/O O/E
DSP FE
LO
MMW
Conventional optical-MMW link: Large latency, high power
RAU
DigitalE/O O/E FE
Opt. LO
MMW
4
Operating principle
λ1 λ2
f
E/O O/E Down.
Microwave
MillimeterMicrowave
λ1 λ2
O/Econverter
Optical fiberλλ1 λ2
Δf
Freq.
f = |c/λ1-c/λ2|
Up.Down.E/OO/E
Microwave
LO
MillimeterMicrowave λ
5
VSA: Vector Signal AnalyserLNA: Low Noise AmplifierATT: AttenuatorOBPF: Optical Band Pass Filter
MZM: Mach-Zehnder ModulatorEDFA: Erbium-Doped Fiber AmplifierVSG: Vector Signal GeneratorPD: photo-detector
Downlink system: experimental setup
6
P. T. Dat et al., ECOC (2016)
1 m89.2 – 92.45
GHz
CS
AWGTwo-tone
opt. gen.
MZM
20 km
PCAWG
LNALNA
RRH
88.1 GHz
LTE-A F-O
FDM
÷PDPA
RAU
ATT1,549.4 1,550 1,550.6
-90
-70
-50
-30
-10
10
Wavelength (nm)
Pow
er (
dBm
)
EDFAEDFAOBPF OBPF
Downlink system: experimental results
7
Data 1 Data 2
-2 0 2 4 6 8Tx. LTE-A Power (dBm)
8
12
16
20
24
EVM
(%)
Sig. 1, data 1
Sig. 1, data 2
Sig. 2, data 1
Sig. 2, data 2
Sig. 3, data 1
Sig. 3, data2
Sig. 4, data 1
Sig. 4, data 2
0 1 2 3 4 5 6
Rx. Opt. Power (dBm)
8
12
16
20
24
EVM
(%)
Sig. 1, data 1
Sig. 1, data 2
Sig. 2, data 1
Sig. 2, data 2
Sig. 3, data 1
Sig. 3, data 2
Sig. 4, data 1
Sig. 4, data 2
Performance versus received optical powers Performance versus LTE-A signal powers
P. T. Dat et al., ECOC (2016)
1 1.5 2 2.5 3 3.5 4 4.5-70
-60
-50
-40
-30
-20
-10
Frequency (GHz)
Pow
er (d
Bm)
Sig.1 Sig.2 Sig.3 Sig.4
Bidirectional system: experimental setup
LNA LNA
Remote Radio Head
ED
DL LTE-Ainter-band 2
VSG
UL LTE-A
LO
96 GHz
Did.
DL LTE-Ainter-band 1
VSA_1
VSA_2
Sync.
MZM
EDFA
PD PA10 km 92.5 GHz
Com.
DL LTE-Ainter-band 1
Central StationRemote Antenna Unit
DL LTE-Ainter-band 2
VSG_2
ATT
RoFRx.VSA
UL LTE-ARoFRx.
LNA
ED
LNA
96 GHz
VSG_1
ATT
Sync.
EDFA
Opt. MMW Gen.
830 840 850 860 870-120
-100
-80
-60
-40
Frequency (MHz)
Pow
er (
dBm
)
2.580 2.59 2.6 2.61 2.62-120
-100
-80
-60
-40
Frequency (GHz)
Pow
er (
dBm
)
8
Bidirectional: experimental results
Successful bidirectional transmission for CA LTE-A signals Applicable for future 5G signal transmission (256-QAM with EVM < 3.5%) PONs can be applied for optical transport (ITU-T req. for PONs: 15 dB)
P. T. Dat et al., OFC (2015)DL LTE-A signal
-2 0 2 4 6
Rx. Opt. Power (dBm)
0
2
4
6
8
10
12
EV
M (%
)
64-QAM, interband 1
64-QAM, interband 2
-2 0 2 4 6
Rx. Opt. Power (dBm)
0
2
4
6
8
10
12
64-QAM, interband 1
64-QAM, interband 2
Only DL With UL
-15 -10 -5 0 5
Rx. Opt. Power (dBm)
2
4
6
8
10
12
64-QAM, no DL
64-QAM, with DL
UL LTE-A signal
>17 dB
9
Seamless fiber-wireless for moving cells
Millimeter-wave
WDM Radio over Fiber
Linearly located remote cells
Metro/Access Network Control Station
RAU #1 RAU #2 RAU #n
Multiplexer
Aisle Seat
From outside
P. T. Dat et al., IEEE Commun. Mag. (2015)
10
Network control and moving cells
Switch
Metro/Access Network
Location position
Switch control
Uplink power
λ1, λ2 λ3, λ4
Control Office
WDM RoF Tx.W
DM
D
EMU
X
λ n-1, λn
Signal Processing
Units
ModulationModulation
Modulation
11
Proof-of-concept: experimental setup
DPMZM: Dual-parallel MZMOBEF: Optical band pass elimination filterOBPF: Optical band pass filterATT: AttenuatorP-S: Power SplitterISO: IsolatorPS: Phase shifter
EDFA 1 km
MZM2 EDFALD2
20 km
CS
ATT
(1)
LD1 MZM1
DPMZMLD
OBEF EDFA OBPF
Opt. MMW Gen. 1LO_1
(3)
(2)
RAU_1PD PA
X
PD
LNA
RoFTx.
LNA
P-S
ATT. PA
ISO ISOPS
SHD
TAU
Opt. MMW Gen. 2ATT
ATT
RoFRx.
ATT
LO_2LO_3
VSA
PC VSG
(4)
(5)
(6)
1548 1552 1556-80
-60
-40
-20
0
Wavelength (nm)1547 1551 1555
-80
-60
-40
-20
0
Wavelength (nm)1555 1556 1557
-80
-60
-40
-20
0
Wavelength (nm)1548 1550 1552
-80
-60
-40
-20
0
Wavelength (nm)
Powe
r (dBm
)
1548 1549 1550 1551-80
-60
-40
-20
0
Wavelength (nm)1548 1550 1552
-80
-60
-40
-20
Wavelength (nm)1548 1550 1552
-80
-60
-40
-20
Wavelength (nm)
(1) (2) (3) (3) (4) (5) (6)
RF cable
10 MHz
RAU_2
AP 20 GHz40 GHz
41.9 GHz
23.125 GHz
IF
LO
P. T. Dat et al., OFC (2016)
12
Good performance for both backhaul and over in-train networks High-spectral efficiency, low fiber-dispersion, cost effective system
-6 -4 -2 0 2 44
6
8
10
IF Tx. Power (dBm)
EVM
(%)
-4 -2 0 2 4 64
6
8
10
IF Tx. Power (dBm)
32-QAM, CH164-QAM, CH132-QAM, CH264-QAM, CH2
32-QAM, CH164-QAM, CH132-QAM, CH264-QAM, CH2
P. T. Dat et al., OFC (2016)
Proof-of-concept: experimental results
30-MHz OFDM signal 50-MHz OFDM signal
13
Multiple radios over fiber
14
Signal-1 Subcarrier mapping IFFT-1 CP-1
Subband-1filter
Signal-K Subcarrier mapping IFFT-K CP-K Subband-K
filter
+
Multi-RATs over seamless fiber-wireless system
Data mapping using F-OFDM
4G or control signals DAC
+ E/O
Optical LO
BBU pool-1
BBU pool-N
DSP-based mapping DAC
MFHRAT-14G LTE
O/E
CPRI for fronthauling: bit rate >> 100 Gb/s/cell.
RoF: high-speed components, massive systems
Cooperation of optical and radio access networks
Multiple radios over fiber: experimental setup
20 km
MZM
EDFA
LD
CS
DPMZMLD
EDFA OBPFFrequency
Doubler
VSG VSGLTE-A
IFCom.
AWG
12 GHz
ATT
RRH
PDPDATT
25-GHz RAT
LPF
IF signal
LO signal
OBPF
OBPFVSA
21 GHz
User
RAU
PDATT
Div.LTE-A
X4
OBPF
ATT PDOBPF
2.5 m96-GHz
MFH
95 GHz
OSC
RRH
HPF
MZM: Mach-Zehnder ModulatorEDFA: Erbium-Doped Fiber AmplifierVSG: Vector Signal GeneratorCom.: RF combinerPD: photo-detector
Did. RF DividerVSA: Vector Signal AnalyserLNA: Low Noise AmplifierATT: Attenuator(O)BPF: (Optical) Band Pass Filter
PC
15
1555.6 1556Wavelength (nm)
-90
-70
-50
-30
-10
10
Pow
er (d
Bm)
Multiple radios over fiber: experimental results
-8.5 -7.5 -6.5 -5.5 -4.5
Rx. Opt. Power (dBm)
10
12
14
16
18
20
EV
M (
%)
Signal 1
Signal 2
Signal 3
Signal 4
6 8 10 12 14 16
Tx. LTE-A Power (dBm)
10
12
14
16
EV
M (%
)
Signal 1
Signal 2
Signal 3
Signal 4
0.5 1 1.5 2 2.5 3
Frequency (GHz)
-110
-90
-70
-50
-30
Po
we
r (d
Bm
)
OFDM LTE-A
Sig. 1 Sig. 2 Sig. 4Sig. 3
OFDM NOMA (16 x 16) SCMA
3.96 4 4.04Frequency (GHz)
-90
-50
-10
Pow
er (d
Bm)
OFDM
FBMC
-10 -8 -6 -4
Rx. Opt. Power (dBm)
2
4
6
8
OFDM
OFDM NOMA
OFDM SCMA
FBMC
-18 -14 -10 -6
Rx. Opt. Power (dBm)
1
2
3
4
CC1 (20 MHz)
CC2 (20 MHz)
CC3 (20 MHz)
EV
M (%
)
F-OFDM Signal
LTE-A Signal New RAT signal (OFDM/FBMC) 16
Summary
Seamless convergence of fiber-MMW would be a potential solution for future mobile fronthauling when fiber cable is not available.
Convergence of WDM IFoF and linearly located distributed antenna systems is very promising for high-speed communication to high-speed trains.
Co-design and cooperative fiber-radio access networks would be the key for future MMW and massive MIMO mobile signal, and multi-RAT transmission.
17
Thank you ptdat@nict.go.jp
This work was conducted as a part of the “Research and development for expansion of radio wave resources,” supported by the Ministry of
Internal Affairs and Communications (MIC), Japan.
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