Technologies for future mobile transport networks Pham Tien Dat 1 , - - PowerPoint PPT Presentation

Technologies for future mobile transport networks

Pham Tien Dat1, Atsushi Kanno1, Naokatsu Yamamoto1, and Tetsuya Kawanishi1,2

1National Institute of Information and Communications Technology, Japan

2Wasdea 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

• ffice

MUX/ DEMUX RRH RRH RRH RAU RAU RAU

3

Fiber-wireless convergence

Seamless optical and MMW connection: Low latency, low power

RAU Digital

E/O O/E DSP FE LO

MMW

Conventional optical-MMW link: Large latency, high power

RAU Digital

E/O O/E FE

• Opt. LO

MMW

4

Operating principle

λ1 λ2

f E/O O/E

Down.

Microwave Millimeter

Microwave

λ1 λ2

O/E converter

Optical fiber

λ λ1 λ2 Δf Freq. f = |c/λ1-c/λ2|

Up. Down. E/O O/E

Microwave

LO Millimeter

Microwave

λ

5

VSA: Vector Signal Analyser LNA: Low Noise Amplifier ATT: Attenuator OBPF: Optical Band Pass Filter MZM: Mach-Zehnder Modulator EDFA: Erbium-Doped Fiber Amplifier VSG: Vector Signal Generator PD: photo-detector

Downlink system: experimental setup

6 P . T . Dat et al., ECOC (2016)

1 m 89.2 – 92.45 GHz

CS

AWG Two-tone

• pt. gen.

MZM 20 km PC AWG

LNA LNA

RRH

88.1 GHz LTE-A F-OFDM

÷

PD PA

RAU

ATT

• 90
• 70
• 50
• 30
• 10

EDFA

EDFA OBPF OBPF

Downlink system: experimental results

7

Data 1 Data 2

• 2

2 4 6 8

• Tx. 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

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) Power (dBm)

Sig.1 Sig.2 Sig.3 Sig.4

Bidirectional system: experimental setup

LNA LNA Remote Radio Head ED DL LTE-A inter-band 2 VSG UL LTE-A LO 96 GHz Did. DL LTE-A inter-band 1 VSA_1 VSA_2 Sync. MZM EDFA PD PA 10 km 92.5 GHz Com. DL LTE-A inter-band 1

Central Station

Remote Antenna Unit DL LTE-A inter-band 2

VSG_2

ATT RoF Rx.

VSA

UL LTE-A RoF Rx. 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) Power (dBm) 2.580 2.59 2.6 2.61 2.62

• 120
• 100
• 80
• 60
• 40

Frequency (GHz) Power (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

2 4 6

• Rx. Opt. Power (dBm)

2 4 6 8 10 12

EVM (%)

64-QAM, interband 1 64-QAM, interband 2

• 2

2 4 6

• Rx. Opt. Power (dBm)

2 4 6 8 10 12

64-QAM, interband 1 64-QAM, interband 2

Only DL With UL

• 15
• 10
• 5

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.

WDM DEMUX

λ n-1, λn Signal Processing Units Modulation Modulation Modulation

11

Proof-of-concept: experimental setup

DPMZM: Dual-parallel MZM OBEF: Optical band pass elimination filter OBPF: Optical band pass filter ATT: Attenuator P-S: Power Splitter ISO: Isolator PS: Phase shifter

EDFA 1 km MZM2 EDFA LD2

20 km

CS

ATT (1) LD1 MZM1 DPMZM LD OBEF EDFA OBPF

• Opt. MMW Gen. 1

LO_1

(3) (2)

RAU_1

PD PA X PD LNA RoF Tx. LNA P-S ATT. PA ISO ISO PS SHD

TAU

• Opt. MMW Gen. 2

ATT ATT RoF Rx. ATT

LO_2 LO_3

VSA PC VSG (4) (5) (6)

1548 1552 1556

• 80
• 60
• 40
• 20

Wavelength (nm)

1547 1551 1555

• 80
• 60
• 40
• 20

Wavelength (nm)

1555 1556 1557

• 80
• 60
• 40
• 20

Wavelength (nm)

1548 1550 1552

• 80
• 60
• 40
• 20

Wavelength (nm) Power (dBm) 1548 1549 1550 1551

• 80
• 60
• 40
• 20

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 GHz 40 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

2 4 4 6 8 10 IF Tx. Power (dBm) EVM (%)

• 4
• 2

2 4 6 4 6 8 10 IF Tx. Power (dBm)

32-QAM, CH1 64-QAM, CH1 32-QAM, CH2 64-QAM, CH2 32-QAM, CH1 64-QAM, CH1 32-QAM, CH2 64-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-1 filter 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

MFH RAT-1 4G 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

DPMZM LD EDFA OBPF Frequency Doubler VSG VSG LTE-A IF Com. AWG 12 GHz ATT

RRH

PD

PD

ATT

25-GHz RAT

LPF IF signal LO signal OBPF OBPF VSA 21 GHz

User RAU

PD ATT Div. LTE-A X4 OBPF ATT PD OBPF

2.5 m 96-GHz MFH

95 GHz OSC

RRH

HPF

MZM: Mach-Zehnder Modulator EDFA: Erbium-Doped Fiber Amplifier VSG: Vector Signal Generator Com.: RF combiner PD: photo-detector

• Did. RF Divider

VSA: Vector Signal Analyser LNA: Low Noise Amplifier ATT: Attenuator (O)BPF: (Optical) Band Pass Filter

PC

15

1555.6 1556 Wavelength (nm)

• 90
• 70
• 50
• 30
• 10

10 Power (dBm)

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 EVM (%) Signal 1 Signal 2 Signal 3 Signal 4 6 8 10 12 14 16

• Tx. LTE-A Power (dBm)

10 12 14 16 EVM (%) Signal 1 Signal 2 Signal 3 Signal 4 0.5 1 1.5 2 2.5 3 Frequency (GHz)

• 110
• 90
• 70
• 50
• 30

Power (dBm)

OFDM LTE-A

• Sig. 1 Sig. 2
• Sig. 4
• Sig. 3

OFDM NOMA (16 x 16) SCMA

3.96 4 4.04 Frequency (GHz)

• 90
• 50
• 10

Power (dBm) 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)

EVM (%)

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.