Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS)

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANS)
Submission Title Study of mm wave propagation
modeling to realize WPANs Date Submitted
September 2003 Revised Source Toshiyuki
Hirose Company Siemens k.k. Address 20-14,
Higashi-Gotanda 3-Chome Shinagawa-ku, Tokyo
141-8641, Japan Voice 81(3) 5423-8855, Fax
81(3) 5423-8728, E-mail toshiyuki.hirose_at_siem
ens.com Re Millimeter wave propagation
characteristics Abstract 60GHz-band
Propagation characteristics are presented in this
document Purpose Contribute to mm wave
interest group for WPANs 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 or
organization. The material in this document is
subject to change in form and content after
further study. The contributor reserves 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.
Submission
Slide1
ltToshiyuki Hirosegt, ltSiemens K.K. gt

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Study of mm wave propagation modeling to realize
WPANs
The following individuals support this proposal
as co-authors Akira AKEYAMA (NTT Advanced
Technology Corp.) Kouichi SAKAMOTO (Murata
Manufacturing Co., Ltd.) Ami Kanazawa
(Communications Research Laboratory)
Submission
Slide2
ltToshiyuki Hirosegt, ltSiemens K.K. gt

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Study of mm wave propagation modeling to realize
WPANs 60GHz-Band is expected to realize a very
high rate transmission system. But due to its
very large propagation loss, it will be a very
short distance communication system. In this
document, several propagation characteristics are
presented for the promotion of new system
proposals. Large propagation loss and high speed
data rate transmission limit to the link budget,
and Line of Sight (LoS) path is available only
for communications. Maximum distance of this
very short distance communication are several
meters to several ten meters depending on the
antenna gain. ? Propagation loss in home
environment ? Effect of path distance for delay
spread ? Effect of desk ? Effect of
building material ? Effect of transmitter and
receiver siting ? Effect of movement of
persons in the hall  This measurement results are
a summary of the experimental works done in a
collaboration research project for
Millimeter-wave Ad-Hoc communication in YRP.
Submission
Slide3
ltToshiyuki Hirosegt, ltSiemens K.K. gt

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? Propagation loss in a home environment
An example of propagation at 60GHz loss in a home
environment
Submission
Slide4
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Indoor propagation loss parameters
From ITUP.1238-1
Frequency N L
900MHz 33 9 (1 floor), 19(2 floors), 24(3 Floors)
1.2-1.3GHz 32
1.8-2.0GHz 30 154(n-1)
4GHz 28
5.2GHz 31 16(1 Floor)
60GHz 22
(NLoss Coefficient)
(LLoss factor by wall)
Ltotal20log10fNlog10dLf(n)-28 (dB)
Results shows N20 will be available
Lf depends on the construction material of the
wall
Submission
Slide5
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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? Effect of path distance for Delay spread
Indoor propagation characters are affected by
furnishing, furniture and PC tool. Delay-Distance
characteristic in both LOS and NLOS are presented

Measurement Parameters
Submission
Slide6
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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LOS R.M.S Delay
Delay-distance characteristic in LOS
and NLOS
Floor plan of experimental room
NLOS R.M.S Delay vs. Distance characteristic 
Submission
Slide7
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Conclusion
Experimental results show in LOS propagation
environment ? Delay spread increases with site
distance increase ? Delay spread increases with
antenna beam-width increase ? No significant
difference between 60GHz and 70GHz  Difference of
delay-distance characteristic in LOS and NLOS ?
LOS with little furniture and desk Delays are 6
to 7nS ? NLOS with furniture and desks Delays
are 14 to 16nS
Submission
Slide8
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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? Effect of desk Millimeter-wave WPAN is
expected to be used in homes, offices, exhibition
halls and gardens. For home and office use, two
ray propagation model will be applied in the case
that the propagation path is set along a plane.
In case of using of a note-type PC card slot on
the desk, the reflection from desk plane affect
the received signal level. Usually this effect is
called 2-ray pass model.

Measurement parameters for the 2 ray pass model
 
Submission
Slide9
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Additional propagation loss from reflection of a
wood desk
Submission
Slide10
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Additional propagation loss from reflection of a
metal desk
Submission
Slide11
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Equation of 2 ray pass model
D Path length h Path height
Reflection coefficient G-1(wood),G1 (metal)
Conclusion of effect of desk
Experimental results show that the received
signal decreased significantly and increased up
to 6dB according to the location of the terminal.
This additional propagation loss will impose
restrictions on system design concepts
Submission
Slide12
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Exact solution for the Fresnel zone radius
For checking the correctness of the 2 ray model,
Fresnel zone radius shall be calculated. The
currently used equation is an approximation, and
to confirm the actual radius, an exact equation
was introduced as below
Exact solution
Approximation
Submission
Slide13
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Angle difference from Axis
Variation of Visibility Angle by Distance
60GHz Fresnel Zone Radius
Exact solution of Fresnel zone (Distance 4m)
Submission
Slide14
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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? Effect of building material Indoor
propagation characteristics are affected by
reflection from and transmission through the
building material. Penetration loss is an
essential factor to consider for the re-use of
frequency in mm-WPAN

Measured penetration loss of wall-materials in
60GHz-band
Wall material Penetration loss
Concrete wall 40dB or more
Outside siding board wall 25dB
Plywood wall 6dB
Glass wall 2-4dB
 
Submission
Slide15
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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  Complex permittivity of construction materials
To calculate the reflection and transmission
characteristics from/through the building
material, the complex permittivity of
construction materials are indispensable.
Complex permittivity measuring system
Submission
Slide16
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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An Example of measurement

Concrete
Equivalent complex permittivity of some
construction materials
Material 62GHz 70GHz
Plaster Board 2.17-j0.01 3.17-j0.01
Glass 6.24-j0.17 6.16-j0.13
Porous Gravel 1.8-j0.09 1.8-j0.09
Grass 1.0-j0.02 1.0-j0.02
Submission
Slide17
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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? Effect of movement of persons in the exhibition
hall  Statistical characteristic of shadowing
loss due to human movement was measured. The
width of the exhibition hall 22m13m (wooden
inner walls)
Measurement Parameters
Submission
Slide18
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Measurement Procedure and Scenery
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The width of the hall 22m13m (wooden inner
walls)
An exhibition hall scenery
Measurement layout in an exhibition hall
Submission
Slide19
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Variation of Received Signal
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Sample measurement
Submission
Slide20
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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The Variation of Averaged Continuous Shadowing
Durations
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The difference of shadowing duration becomes
clearly dependent on path length.
Submission
Slide21
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Conclusion of shadowing duration
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Doc.IEEE802.15-03/0365
Shadowing Duration Attenuation 1530dB
Shadowing duration depends on path distance.
Attenuation gt 30dB Shadowing duration is
independent from path distance.
Submission
Slide22
ltToshiyuki Hirosegt, ltSiemens K.K. gt
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Reference T.Suzuki, et al, Millimeter-wave
Ad-Hoc Wireless Access System-(9)RMS Delay
Measurements In Indoor Radio Channels-TSMMW2002,p
-9(2002-03)   N.Sakamoto, et al, Indoor
propagation Experiment at 60GHz and 70GHz-A study
of propagation characteristic in an office
environment- TECNICAL REPORT OF
IEICE.RCS2002-3001,pp157-162(2003-03)   N.Kuribaya
shi, et al, Millimeter-wave Ad-Hoc Wireless
Access System?-(4) (4)Receiving Power Time
Variation Characteristics in 70GHz Band Indoor
Propagation TSMMW2003,2-4,(2003-03)   F.Ohkubo,
et al, Millimeter-wave Ad-Hoc Wireless Access
System?-(5)Statistical characteristic of
shadowing loss due to human movement
TSMMW2003,2-5,(2003-03)   N.Kuribayashi, et al,
Millimeter-wave Ad-Hoc Wireless Access
System-(8)60GHz Band propagation Loss
Characteristics Along the Surface of
Wooden/Metallic Desk Planes- TSMMW2002,p-8(2002-0
3)   T.Hirose, et al, Millimeter-wave Ad-Hoc
Wireless Access System-(7) Strict Solution of
Fresnel Zone Radius and Visibility Estimation-
TSMMW2002,p-8(2002-03)
Submission
Slide23
ltToshiyuki Hirosegt, ltSiemens K.K. gt