presentation about my paper. User body shadowing analysis by UTD simulation model (Communication engineering)

1. [ The Modeling of User Body ]
Shadowing based on the UTD
Radio Technology Lab (prof. C.H. Kim)
Kim Changhoe
RadioTechnologyLab
Seoul National University

2. INDEX
1. Introduction
2. UTD Model
3. Experiment Model
4. Result of UTD & Experiment Model
5. Conclusion
RadioTechnologyLab
Seoul National University

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1. Introduction (1/2)
echnology
aboratory L
 Shadowing effect means the phenomenon that obstacle including building or
 Human is the nearest obstacle of the mobile (receiver)
 Human can disturb wave propagation in indoor environment
RadioTechnologyLab
Seoul National University
 Shadowing Effect
mountain attenuates the received signal power
 Important when we model the channel
 Human & wave propagation
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1. Introduction – Problem set (2/2)
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 Shadowing effect by user (specially, in a indoor environment)
 Reflection, diffraction should be considered
RadioTechnologyLab
Seoul National University
 What is the Problem ?
 How can We Solve ?
UTD Exact
calculation
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Body
shadowing
effect

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2. UTD Model (1/4)
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 UTD (Uniform Geometrical Theory of Diffraction)
 Effective method for analyzing diffraction of material
We can obtain numerical analysis values
 Three types of diffraction situation (Scattering, Radiation, Coupling)
Scattering Radiation Coupling
X Only Rx or Tx Tx & Rx
RadioTechnologyLab
Seoul National University
Stick to
material
Concept
Figure
Tx
Rx
material
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Tx
Rx
Tx
Rx
material material
Model
Contents

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2. UTD Model (2/4)
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 NLOS(non-LOS) component
 Including the distance, material and diffraction effect should be
involved
RadioTechnologyLab
Seoul National University
 Lit Zone
 LOS(Line-of-Sight) component
 Dependent on the distance mainly
 Shadow Zone
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2. UTD Model – Scattering (3/4)
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RadioTechnologyLab
Seoul National University
When Rx is in Lit zone,
푬푺,푳푶푺 = 푬ퟎ푹푳풅풆−풋풌풔푺ퟏ + 푬ퟎ
 푬ퟎ = E-field of LOS component
 R = UTD reflection coefficient, L = distance coefficient
 When Rx is in Shadow zone,
푬푺,푵푳푶푺 = 푬ퟏ푻ퟏ
풆−풋풌풔푺ퟐ
√풔푺ퟐ
+ 푬ퟐ푻ퟐ
풆−풋풌풔푺ퟑ
√풔푺ퟑ
 E1, E2 = E field at Q1’, Q2’ respectively
 T1, T2 = UTD diffraction coefficient (Q1’-Q1, Q2’-Q2)
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2. UTD Model – Radiation (4/4)
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푬푹,푳푶푺 = 푪ퟎ푯ퟏ 풄풐풔 휽풍 풆−풋풌풔푹ퟏ
√풔푹ퟏ
 푯ퟏ = Radiaton Coefficient in Lit zone
 푪ퟎ = propotional factor, 휽풍 = angle between LOS line and normal line of Rx
RadioTechnologyLab
Seoul National University
 When Rx is in Lit zone,
 When Rx is in Shadow zone,
푬푹,푵푳푶푺 = 푪ퟎ푯ퟐ[풆−풋풌풕ퟏ
풆−풋풌풔푹ퟐ
풔푹ퟐ
+풆−풋풌풕ퟐ
 푯ퟐ=Radiation coefficient in Shadow zone
 푡1, 푡2= arc length respectively Q3-Rx and Q4-Rx
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풆−풋풌풔푹ퟑ
풔푹ퟑ
]

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3. Experiment Model
echnology
aboratory L
RadioTechnologyLab
Seoul National University
 Experiment Model
 The power of received signal is measured
 Rx moved from 휽 = ퟎ° to 휽 = ퟑퟔퟎ° at intervals of 10°
 Frequency of the signal is 2.4GHz
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Chest
Model
Head
Model
Rx-User
(d)
15cm 2cm
Antenna
Height
(Rx)
140cm 170cm

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4. Result – Chest Model (1/2)
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 Measurement pattern is similar with the scattering model
 Scattering model and data dependent on LOS and reflection
component from 휽 = ퟎ° to SSB angle
 Deep fades exist
RadioTechnologyLab
Seoul National University
 Received Power
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4. Result – Head Model (2/2)
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 Also similar pattern with Scattering Model
 Scattering Model and data dependent on LOS and reflection
component from 휽 = ퟎ° to SSB
RadioTechnologyLab
Seoul National University
 Received Power
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5. Conclusion
echnology
aboratory L
 User shadowing effect can be solved by UTD Scattering or Radiation
Model
 Experiment data is similar with Scattering model for
chest model and head model
RadioTechnologyLab
Seoul National University
 UTD Simulation
 the pattern of received power
Future Work
 Experiments based on the motion of user
 Another band frequency (for indoor)
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Reference
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[1] Kim Changhoe, Jung jaehoon, Kim Seongchul, “A Study on the
Modeling of User Body Shadowing based on the UTD”, in Proc. KICS Int,
Conf Commun, Jeju, Korea, June, 2014
[2] J. H. Jung, J. H. Choi, Y.H. Kim and C.H. Kim, “A Study on the User-
Shadowing based on the Ray-tracing”, in Proc. KICS Int, Conf Commun,
pp. 247-248, Pyeongchang, Korea, Jan, 2014
[3] D.A. Mcnamara, C.W. Pistorius, and J.A. Malherbe, “Introduction to the
Uniform Geometrical Theory of Diffraction”, Boston, MA: Artech House,
1990.
RadioTechnologyLab
Seoul National University
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