Technologies for future mobile transport networks

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1 FG IMT-2020 Workshop and Demo Day: Technology Enablers for 5G Technologies for future mobile transport networks Pham Tien Dat 1, Atsushi Kanno 1, Naokatsu Yamamoto 1, and Tetsuya Kawanishi 1,2 1 National Institute of Information and Communications Technology, Japan 2 Wasdea university, Tokyo, Japan

2 Outline Flexible fiber-wireless mobile fronthaul Downlink system Bidirectional transmission Seamless fiber-wireless for moving cells Multiple radios over fiber system Conclusion 2

3 Flexible fiber-wireless transport systems Core network BBU pool BBU BBU BBU Control office MUX/ DEMUX MUX/ DEMUX RRH RRH RAU RAU RAU RRH 3

4 Fiber-wireless convergence RAU MMW Digital E/O O/E DSP FE LO Conventional optical-mmw link: Large latency, high power Opt. LO RAU Digital E/O O/E FE MMW Seamless optical and MMW connection: Low latency, low power 4

5 Operating principle Δf λ 1 λ 2 λ Optical fiber O/E converter f = c/λ 1 -c/λ 2 Freq. Microwave f λ 1 λ 2 Millimeter E/O O/E Down. λ 1 λ 2 Microwave LO Microwave O/E λ E/O Down. Millimeter Up. Microwave 5

6 Downlink system: experimental setup CS AWG PC Two-tone opt. gen. AWG MZM OBPF EDFA OBPF EDFA RRH LTE-A F-OFDM LNA 88.1 GHz LNA 1 m GHz RAU PA Power (dbm) , ,550 1,550.6 Wavelength (nm) PD ATT 20 km 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 P. T. Dat et al., ECOC (2016) 6

7 Downlink system: experimental results Power (dbm) Sig.1 Sig.2 Sig.3 Sig.4 P. T. Dat et al., ECOC (2016) EVM (%) Frequency (GHz) 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 EVM (%) Data 1 Data 2 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 Rx. Opt. Power (dbm) Performance versus received optical powers Tx. LTE-A Power (dbm) Performance versus LTE-A signal powers 7

8 Bidirectional system: experimental setup Central Station VSG_1 DL LTE-A inter-band 1 Opt. MMW Gen. Remote Antenna Unit km ATT PD PA 92.5 GHz Sync. Com. MZM VSG_2 DL LTE-A inter-band 2 EDFA EDFA VSA UL LTE-A RoF Rx. ATT RoF Rx. LNA ED LNA Power (dbm) Frequency (MHz) Power (dbm) Frequency (GHz) VSA_1 Sync. VSA_2 Remote Radio Head DL LTE-A inter-band 1 Did. DL LTE-A inter-band 2 VSG LNA ED UL LTE-A LO 96 GHz LNA 96 GHz 8

9 Bidirectional: experimental results EVM (%) QAM, interband 1 64-QAM, interband 2 Only DL QAM, interband 1 64-QAM, interband 2 With UL QAM, no DL 64-QAM, with DL >17 db Rx. Opt. Power (dbm) Rx. Opt. Power (dbm) Rx. Opt. Power (dbm) DL LTE-A signal UL LTE-A signal P. T. Dat et al., OFC (2015) 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) 9

10 Seamless fiber-wireless for moving cells Metro/Access Network Control Station WDM Radio over Fiber P. T. Dat et al., IEEE Commun. Mag. (2015) Multiplexer RAU #1 Millimeter-wave RAU #2 RAU #n Linearly located remote cells From outside Aisle Seat

11 Network control and moving cells Metro/Access Network Signal Processing Units Control Office Modulation Modulation Modulation WDM DEMUX WDM RoF Tx. Switch Switch control Uplink power Location position λ 1, λ 2 λ 3, λ 4 λ n-1, λ n 11

12 Proof-of-concept: experimental setup CS PC LD 1 MZM 1 VSG ATT 20 km RAU_1 (3) PD IF PA P. T. Dat et al., OFC (2016) SHD LD 2 MZM 2 (1) EDFA (2) PD X LO LNA P-S ATT. ISO PS PA ISO LD DPMZM GHz OBEF EDFA OBPF RAU_2 TAU LO_1 Opt. MMW Gen. 1 LO_3 LO_2 DPMZM: Dual-parallel MZM OBEF: Optical band pass elimination filter OBPF: Optical band pass filter ATT: Attenuator P-S: Power Splitter VSA ISO: Isolator PS: Phase shifter 40 GHz RF cable 41.9 GHz AP RoF Rx. ATT (6) ATT (5) MHz EDFA 1 km ATT (4) 20 GHz Opt. MMW Gen. 2 RoF Tx. LNA Power (dbm) (1) (2) (3) (3) (4) (5) (6) Wavelength (nm) Wavelength (nm) Wavelength (nm) Wavelength (nm) Wavelength (nm) Wavelength (nm) Wavelength (nm) 12

13 Proof-of-concept: experimental results 8 32-QAM, CH1 64-QAM, CH1 32-QAM, CH2 64-QAM, CH QAM, CH1 64-QAM, CH1 32-QAM, CH2 64-QAM, CH2 EVM (%) IF Tx. Power (dbm) 30-MHz OFDM signal IF Tx. Power (dbm) 50-MHz OFDM signal P. T. Dat et al., OFC (2016) Good performance for both backhaul and over in-train networks High-spectral efficiency, low fiber-dispersion, cost effective system 13

14 Multiple radios over fiber Multi-RATs over seamless fiber-wireless system Optical LO BBU pool-1 DSP-based mapping DAC + E/O O/E BBU pool-n 4G or control signals DAC RAT-1 4G LTE MFH CPRI for fronthauling: bit rate >> 0 Gb/s/cell. RoF: high-speed components, massive systems Cooperation of optical and radio access networks Data mapping using F-OFDM Signal-1 Signal-K Subcarrier mapping Subcarrier mapping IFFT-1 IFFT-K CP-1 CP-K Subband-1 filter Subband-K filter + 14

15 Multiple radios over fiber: experimental setup VSG LTE-A Com. IF AWG VSG PC Power (dbm) km Wavelength (nm) OBPF OBPF ATT ATT PD PD X4 Div. LTE-A LD MZM RAU EDFA LD 12 GHz DPMZM EDFA OBPF Frequency Doubler CS 2.5 m 96-GHz MFH 95 GHz HPF RRH OSC 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 OBPF OBPF ATT ATT PD PD LO signal IF signal LPF RRH 25-GHz RAT 21 GHz VSA User 15

16 Multiple radios over fiber: experimental results -30 OFDM LTE-A Signal 1 Power (dbm) Sig. 1 Sig. 2 Sig. 3 Sig. 4 EVM (%) Signal 1 Signal 2 Signal 3 Signal 4 EVM (%) Signal 2 Signal 3 Signal EVM (%) Frequency (GHz) Rx. Opt. Power (dbm) CC1 (20 MHz) CC2 (20 MHz) CC3 (20 MHz) Power (dbm) Rx. Opt. Power (dbm) F-OFDM Signal OFDM NOMA (16 x 16) SCMA OFDM FBMC Frequency (GHz) Tx. LTE-A Power (dbm) Rx. Opt. Power (dbm) OFDM OFDM NOMA OFDM SCMA LTE-A Signal New RAT signal (OFDM/FBMC) 16 FBMC

17 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 highspeed 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

18 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. Thank you ptdat@nict.go.jp

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