doc.: ieee 15-15-0720-00-007a submission september 2015 nan chi, yu zengslide 1 project: ieee...
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![Page 1: Doc.: IEEE 15-15-0720-00-007a Submission September 2015 Nan Chi, Yu ZengSlide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks](https://reader036.vdocument.in/reader036/viewer/2022081513/56649e855503460f94b87e77/html5/thumbnails/1.jpg)
doc.: IEEE 15-15-0720-00-007a
Submission
September 2015
Nan Chi, Yu ZengSlide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Channel Model for Outdoor Freespace Transmission
Date Submitted: July 15, 2015
Source: Nan Chi, Fu Dan University, Yu Zeng, China TelecomAddress: Fu Dan University, 220 Handan Rd., Yangpu District, ShanghaiVoice: Tel: 0086-21-65642983, E-Mail: [email protected], [email protected]: In response to «Call for Proposals for OWC Channel Models» issued by 802.15.7r1, this contribution proposes LiFi reference channel models for indoor environments such as office, home and hospital.
Purpose: To introduce reference channel models for the evaluation of different PHY proposals.
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 2
Channel Model for Outdoor Free Space Transmission
Nan Chi, Yu Zeng
September 2015
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 3 Nan Chi, Yu Zeng
September 2015
Data R
ate Increasing
Different M
odulation Schem
e
Background
Outdoor VLC case is not as popular as Indoor VLC
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 4 Nan Chi, Yu Zeng
September 2015
Research Route
Simulation for Outdoor Long Distance VLC Transmision SystemSystem Structure and Simulation
Parameters Simulation Results and Analysis
Key Technique for Outdoor VLC Transmission SystemPPM Modulation Pre Equalization Diversity reception
technology
VLC Free Space Transmission Channel ModelLED Modulation
PropertyLED dimming
propertyAtmospheric
turbulence model Background Noise
100Mbps OOK Realtime Transmission ExperimentsSystem Structure Results and Analysis
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 5 Nan Chi, Yu Zeng
September 2015
Atmospheric turbulence model Negative Exponential Model : Strong Turbulence Log-Normal Model: Weak Turbulence Gamma-Gamma Model: From weak to strong turbulence
600 800 1000 1200 1400 16000.0
0.1
0.2
0.3
0.4
0.5
0.6
Rytov
S.I.
Distance / m
S.I.
0.0
0.2
0.4
0.6
0.8
1.0
Ryt
ov
300 400 500 600 700 800 900
0.20
0.25
0.30
0.35
1000m
1200m
1100m
S.I.
Wavelength / nm
Rytov 方差
0.50
0.75
1.00
1.25
1.50
Ryt
ov
Scintillation index (S.I.) and Rytov Variation vs distance
Scintillation index (S.I.) and Rytov Variation vs Wavelength
0.0 0.2 0.4 0.6 0.8 1.0
0.000
0.002
0.004
0.006
0.008
0.010
0.012
0.014
PD
F
Light Intensity
Log-normal Exponential Gamma-Gamma
Comparison of 3 Models PDF (Probability density function)
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 6 Nan Chi, Yu Zeng
September 2015
Atmospheric turbulence model Negative Exponential Model : Strong Turbulence Log-Normal Model: Weak Turbulence Gamma-Gamma Model: From weak to strong Turbulence
0.01 0.02 0.03 0.04
1E-3
0.01
0.1
BE
R
N噪声功率
Ngative exponential Gamma-Gamma Lognormal
BER under different Model
Turbulence affect light intense and BER Gamma-Gamma are preferred over other model 。
Noise Power N
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 7 Nan Chi, Yu Zeng
September 2015
Background Noise
Background Noise Impact : Saturate Receiver Affect Receiver Sensitivity
Reduce Background Impact : Reduce Receiver View Angle Reduce Receiver Antenna Size Choose Proper Optical
Bandpass Filter
Sun Noise Model : Black Body Model 2
0( )2r
B r
DP L
Sun Radiation vs Wavelength
Black Radiation vs Wavelength
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 8 Nan Chi, Yu Zeng
September 2015
Modulation
PPM : Immunity to Certain Interference Power Efficient
Bandwidth Requirements
4 6 8 10 12 14
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
BE
R
SNR(dB)
OOK 2PPM 4PPM
Average Power Comparison of PPM and OOK
Bandwidth Requirements Comparison of OOD and PPMOOK 、 2PPM 、 4PPM BER vs SNR
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 9 Nan Chi, Yu Zeng
September 2015
Pre equalization
analog circuit digital circuit
Pre - equalizer based on FIR filter
Original Signal LED Modulated Signal
Pre-Equalized Transmission Signal
Pre-Equalized Received Signal
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 10 Nan Chi, Yu Zeng
September 2015
6 8 10 12
1E-3
0.01
0.1
BE
R
SNR
预均衡 没有预均衡
@BER=3.810-3
After pre-equalization BER is significantly reduced, when the
signal to noise ratio is less than 10 the 7% FEC error threshold
cna still met
Equalized
Un-Equalized
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 11 Nan Chi, Yu Zeng
September 2015
Diversity reception technology
Space Linear diversity :MRC : High Gain, High ComplexityEGC : Gain less than MRC , lower
complexitySC : Minimum Complexity , worst Gain
Optical receiver1
Optical receiverN
Data in
VL
C channel
Optical
transmitter
A1 AN
...Optical receiver2
PPM
modulation
A2
Data out
PPM demodulation
� 0 2 4 6
1E-3
0.01
0.1
BE
R
SNR1/SNR2
MRC EGC SC
2 3 4 5
1E-3
0.01
BE
R支路个数
@3.810-3
BER comparison
MRC sub path vs BER
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 12 Nan Chi, Yu Zeng
September 2015
Simulation
背景光噪声
大气湍流
Pre
-eq
ual
izat
ion
Up
sam
ple
PIN
ĂĂ
PP
M m
odu
lati
on
Do
wn
sam
ple
A1
An
i branch
ĂĂ ě
PP
M d
emo
du
lati
on
Merge output D
ata
ou
t
Da
ta i
n
发射端 接收端传输信道
Pre-Equalization : FIR pre-equ
Diversity and number paths : 4 MRC
Turbulence Model : Gamma-Gamma
Modulation : 4-PPM
Transmitter Channel Model Receiver
Turbulence
Background Noise
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 13 Nan Chi, Yu Zeng
September 2015
Background vs Minimum Transmission Power
Angle of Half(deg) 45
LED Number 3600
Distance(m) 1000
Order of Pre-Equ 5
Bandwidth ( MHz)
400
0.010 0.015 0.020 0.025 0.030 0.035
1E-4
1E-3
0.01
0.1
BE
R
W发射功率( )
30uW 40uW 50uW
@BER=3.810-3
0.0 0.1 0.2 0.3 0.4 0.5 0.6
1E-5
1E-4
1E-3
0.01
0.1
@BER=3.810-3
BE
R
W发射功率( )
300uW 400uW 500uW 600uW 700uW 800uW
Receiver angle of 33° , BER vs Transmission Power under
different Interference
Receiver angle 115° , BER vs Transmission Power under
different Interference
33.8 10BER ,Every 10μW Noise power increase will
results individual LED minimum
Transmission Power increase 5mW
Transmission Power Transmission Power
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 14 Nan Chi, Yu Zeng
September 2015
Equalization circuit
Pattern generator
Error detector
Cl ock
Data out
EA
Bi as Tee
Power supplier LED Lens Pi n
AWG
Pre-amplifier
EA
Vari abl e attenuatorSpl i tter
OSC
BER Testset
OOK
Red LED
Pre-Equalized
LED
Realtime
Transmission
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doc.: IEEE 15-15-0720-00-007a
Submission
Slide 15 Nan Chi, Yu Zeng
September 2015
( a ) Eye diagram no Equalization
( b ) Eye diagram with Equalization
Effective Results
1.95 2.00 2.05 2.10
1E-5
1E-4
1E-3
0.01
0.1
1
BE
R
300M 400M
V驱动电压( )
@3.810-3
Higher Driver voltage Reduce BER, but should under safe LED driver voltage limit
-6 -4 -2 0 2 4 61E-10
1E-9
1E-8
1E-7
1E-6
1E-5
1E-4
1E-3
0.01
0.1
BE
R
°接收端偏移角度( )
300M 400M
@BER=3.810-3 300MHz , variation angel 5° ;400MHz , variation angel 3° 。
Receiver Angel
Driving Voltage
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doc.: IEEE 15-15-0720-00-007a
Submission
September 2015
Conclusion
Creative Points
Results
Simulation : VLC Outdoor
Transmission Model
Transmission Key poings
VLC Outdoor Free Space Transmission Model
Experiment: 100Mbps OOK
Realtime transmission system
Future work : More
improvement Setup long
distance VLC Platform
Pilot study on Outdoor Free Space VLC Transmission
Paper:Jiayi Zhao, Nan Chi. Indoor LED location technique comparison study[J]. Light and lighting ,2015,01:34-41
Slide 16 Nan Chi, Yu Zeng