april 2013 doc.: ieee 11-13/0177r2 proposal of rof ... · requirements. rof extension link has...
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Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 1
Proposal of RoF Extension Link Backhaul for Category 4
Date: 2013-04-24
Name Affiliations Address Phone email Tetsuya Kawanishi NICT Koganei, Japan [email protected]
Atsushi Kanno NICT Koganei, Japan [email protected]
Hiroyo Ogawa NICT Koganei, Japan [email protected]
Nobuhiko Shibagaki Hitachi Kokubunji, Japan [email protected]
Hiroshi Hanyu Hitachi Kawasaki, Japan [email protected]
Authors:
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 2
Abstract RoF (Radio on Fiber) extension link is proposed as one of usage models of 11aj backhaul. RoF extension link can extend wireless access area to the different location without additional requirements. RoF extension link has broadband transmission capability because of O/E and E/O broadband conversion characteristics and can transmit signals at 45-GHz and 60-GHz bands simultaneously. The additional experimental results of RoF extension link are presented. The aim of this contribution is to add usage model 4c in the IEEE 802.11aj Usage Models Document IEEE 802.11-12/1145r2.
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 3
Overview of WFA VHT usage models for 802.11ad Category # Usage Model 1.Wireless Display 1a Desktop Storage & Display
1b Projection to TV or Projector in Conf Rom 1c In room Gaming 1d Streaming from Camcorder to Display 1e Broadcast TV Field Pick Up 1f Medical Imaging Surgical Procedure Support
2.Distribution of HDTV 2a Lightly compressed video streaming around home 2b Compr. video steaming in a room/ t.o. home 2c Intra Large Vehicle (e.g. airplane ) Applications 2d Wireless Networking for Small Office 2e Remote medical assistance
3.Rapid Upload / Download 3a Rapid Sync-n-Go file transfer 3b Picture by Picture viewing 3c Airplane docking 3d Movie Content Download to car 3e Police / Surveillance Car Upload
4.Backhaul 4a Multi-Media Mesh backhaul 4b Point to Point backhaul
5.Outdoor Campus /Auditorium 5a Video demos / telepresence in Auditorium 5b Public Safety Mesh
6.Manufacturing Floor 6a Manufacturing floor automation 7.Cordless computing 7a Wireless IO / Docking
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 4
Category 4: Backhaul a. Multi-Media Mesh Backhaul
• Hotspot • Enterprise • Small Office or Home • Campus-wide deployments • Municipal deployments
b. Point-to-Point Backhaul c. RoF* Extension Link Backhaul
* Radio on Fiber
4
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 5
Usage Model 4c: RoF Extension Link Backhaul
Projector
RoF Extension Link
1st 1st floor
2nd floor
Access Point
O/E&E/O devices
O/E&E/O devices
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 6 6
Usage Model 4c: RoF Extension Link Backhaul Pre-Conditions: Wireless zones are connected via RoF extension link. The individual wireless zones can support high-speed-data traffic requirements that are limited by the VHT link capabilities. Application: Traffic is bidirectional and is comprised of subcarriers which include data, voice, video, and any kinds of signals. These subcarriers are equivalent to radio frequencies, i.e. either 45GHz or 60 GHz bands. RoF extension link extends coverage areas without any performance degradation of traffic requirements. Environment: Environment can be home, office, manufacturing floor, etc. Point-to-point link distance can be extended up to 20 km due to low insertion loss of optical fiber cables. Typically locations are Non-Line-of-Sight. No frequency interferences can be managed by use of optical fiber cable.
Traffic Conditions: RoF extension link can carry any type of traffic due to broadband transmission capability of RoF devices. End of each link is heavily loaded with equal amount of traffic in both directions. Use Case: 1. Wirelessly separated spaces such as rooms of
houses surrounded by concretes are directly connected through RoF extension link without any digital signal processing units.
2. In spite of physical and electromagnetic separation, one wireless zone is extended to another wireless zone which has the same characteristics of the original one.
3. Users at different locations can take advantage of broadband multi-media applications.
Submission
doc.: IEEE 11-13/0177r2
100-kHz-linewidth tunable laser
Mach-Zehnder Optical modulator
Optical band-pass
Filter 1
Er-doped fiber amplifier
Photodetector
Optical band-pass
Filter 2
RoF Tx
RoF Rx
Vector network analyzer
Optical fiber 0~15 km
Tunable laser: Yenista optics OSICS TLS-AG (Power stability: ±0.03 dB) MZ modulator: GIGOPTIX LX8901 (3-dB BW:>65 GHz) Photodetector: u2t photonics XPDV4120 (3-dB BW:100 GHz) EDFA: Amonics Burst-mode EDFA (Sat. power 20 dBm, NF:<5.5 dB) Bandpass filter1: BW > 1 nm for generation of single sideband signal Bandpass filter2: BW ~ 1 nm for suppression of ASE noises from EDFA
Slide 7
-18 dBm
April 2013
Tetsuya Kawanishi, NICT, et al.
Experimental Setup of RoF Link
Submission
doc.: IEEE 11-13/0177r2
Slide 8
April 2013
Tetsuya Kawanishi, NICT, et al.
Subcarrier Transmission of RoF Extension Link
-45
-35
-25
-15
-5
5
1550.2 1550.4 1550.6 1550.8 1551
Opt
ical
pow
er (d
Bm
)
Wavelength (nm)
40.5 GHz47 GHz57 GHz列1
Submission
doc.: IEEE 11-13/0177r2
Amplitude Deviation: < 2 dBp-p at 40.5-47 GHz ~ 2 dBp-p at 57-66 GHz
Slide 9
April 2013
Tetsuya Kawanishi, NICT, et al.
Submission
doc.: IEEE 11-13/0177r2
Frequency response of RoF link at 40-48 GHz and 56-67 GHz bands
Slide 10
April 2013
Tetsuya Kawanishi, NICT, et al.
Submission
doc.: IEEE 11-13/0177r2
Measured link loss: ~ -28 dB @ 40GHz ~ -31 dB @ 60GHz
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 11
Broadband frequency characteristics of RoF link
Submission
doc.: IEEE 11-13/0177r2
60GHz Tx
Laser Optical modulator
Optical amplifier
Optical BPF
60GHz Rx
70-GHz-BW photodiode
IF IN. IF OUT.
E/O convertor O/E convertor
Coaxial cable Optical fiber
Blockdiagram of Single-Side-Band Signal Transmission Experiment of RoF Extension Link
using IEEE802.11ad Signal
RoF Extension link
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 12
Submission
doc.: IEEE 11-13/0177r2
60-GHz π/2-BPSK Signal Transmission Experimental Results (1)
RF Back to Back 180m RoF Extension link
EVM: 3.3% (-29.6dB) EVM: 12.7% %(-17.9dB)
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 13
Submission
doc.: IEEE 11-13/0177r2
Ch.4 (fc=64.80 GHz)
60-GHz π/2-BPSK Signal Transmission Experimental Results (2)
Required spectrum mask at channel 4 of 802.11ad
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 14
Submission
doc.: IEEE 11-13/0177r2
60-GHz 16QAM Signal Transmission Experimental Results
EVM：14% (-17dB) Ch.4 (fc=64.80 GHz)
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 15
Submission
doc.: IEEE 11-13/0177r2
EVM (Error Vector Magnitude) vs. Fiber Length
02468
101214161820
0 50 100 150 200
Ch. 1 (fc=58.32GHz)Ch. 2 (fc=60.48GHz)Ch. 3 (fc=62.64GHz)Ch.4 (fc=64.80GHz)RF BtB (ave.)16QAM(Ch.1)
EVM
(%)
Transmission length (m)
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 16
Submission
doc.: IEEE 11-13/0177r2
0
50
100
150
200
250
300
350
400
0 30 50
Delay Time of RoF Extension Link
Fiber length (m)
Del
ay (n
s)
RoF Back to Back
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 17
Submission
doc.: IEEE 11-13/0177r2
Spurious Free Dynamic Range of RoF Extension Link April 2013
Tetsuya Kawanishi, NICT, et al. Slide 18
Measured noise floor: -105 dBm (IFBW:3Hz)
Estimated noise floor: -109 dBm/Hz
Fundamental
IM3
At 60GHz OIP3: -8.5 dBm IIP3: 23 dBm
SFDR 67 dBHz2/3
40 GHz 60 GHz
Submission
doc.: IEEE 11-13/0177r2
Level Diagram of RoF Extension Link April 2013
Tetsuya Kawanishi, NICT, et al. Slide 19
-130
-110
-90
-70
-50
-30
-10
10
RF input Opt. Mod.Opt. Amp.Opt. BPFRF output
RF
pow
er (d
Bm
)
Supurious free upper limit
11ad maximum received level
11ad minimum received level(MCS0)
Optical section
In: -33 dBm (IEEE802.11ad D6.0) / Out: -64 dBm
In: -10 dBm / Out: -41 dBm
In: -78 dBm / Out: -109 dBm
SFDR: 67dB
Submission
doc.: IEEE 11-13/0177r2
AP-MG RT-RoF ExL-MG RT-STA Uplink/Downlink - No additional requirement for Beamforming Training -
MG RT: Multi-Gigabit Relay Transceiver
DMG AP
MG RT
April 2013
Tetsuya Kawanishi, NICT, et al. Slide 20
RoF ExL: Radio on Fiber Extension Link
DMG STA
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 21
Standards related to Indoor Use of Optical Fiber Cable
• IEC60793-2-40 Ed.4.0 Optical fibers – Part 40: Product specifications – Sectional specification for category A4 multimode fibers
Technical Paper published by Optoelectronic Industry and Technology Development Association (Japan） • TP02/BW-2011 - Optical fiber distribution system for
apartment houses in FTTH • TP01/BW -2011 - Optical fiber distribution system for
detached houses in FTTH • OITDA/TP03/BW-2012 - Optical fiber distribution system
for customer premises
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 22
Summary and Consideration • RoF extension link backhaul was proposed for Category 4 (Backhaul) • RoF extension link backhaul can extend wireless access area through
optical fibre without additional requirements. • Data transmission experiment of RoF extension link using 802.11ad
signal were presented and EVM of transmitted signals are less 14 %. • Additional delay time caused by RoF extension link is about 350 ns at a
fibre cable length of 50 m. • Maximum length of fibre cable is about 440 m which satisfies the
maximum propagation delay time requirement of 4.5µm between STA and AP.
• Spurious free dynamic range of RoF extension link is 67 dBHz3/2, however, SFDR can be improved by connecting low noise amplifiers with the optical modulator.
• Required technical specification of RoF extension link which satisfies with all requirement to 801.11aj will be presented at the next meeting.
Submission
doc.: IEEE 11-13/0177r2 April 2013
Tetsuya Kawanishi, NICT, et al. Slide 23
Acknowledgments: This work was supported in part by “The research and development project for the expansion of radio spectrum resources" of the Ministry of Internal Affairs and Communications in Japan