doc.: IEEE 802.15-04-0112-01-004a
March 2004
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
[Spatio-Temporal UWB Propagation Channel Characterization]
[14 March, 2004]
[Katsuyuki Haneda (1), Jun-ichi Takada (1) and Takehiko Kobayashi (2)]
[(1) Communications Research Laboratory UWB Technology Institute /
Tokyo Institute of Technology,
(2) Communications Research Laboratory UWB Technology Institute /
Tokyo Denki University]
Address
[3-4, Hikarino-oka, Yokosuka city, Kanagawa 239-0847 Japan]
Voice
[]
E-Mail:
[(1) {haneda, takada}@ap.ide.titech.ac.jp, (2) koba@c.dendai.ac.jp ]
Re: [Status report of the 802.15.4a channel modeling subgroup]
Abstract: [This contribution describes the results of spatio-temporal propagation channel
measurements in a typical home environments in Japan. ]
Purpose: [Reports on UWB channel measurement for IEEE802.15TG4a]
Submission Title:
Date Submitted:
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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.
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The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may
be made publicly available by P802.15.
Submission
Slide 1
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Spatio-Temporal UWB
Propagation Channel
Characterization
Katsuyuki Haneda (1), Jun-ichi Takada (1)
Takehiko Kobayashi (2)
Communications Research Laboratory
(1) Tokyo Institute of Technology
(2) Tokyo Denki University
Presented by Honggang Zhang, Yuko Rikuta
Communications Research Laboratory
Submission
Slide 2
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Table of contents
• Spatio-temporal channel measurement
technique
• Specifications of experiment
• Measurement site
• Path identification results
• Clusters in spatio-temporal domain and their
relation to physical structure of the
environment
• Diffuse scattering
Submission
Slide 3
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Channel measurement technique (1)
• Double directional measurement
• Spatial transfer function distribution
measurement by VNA in conjunction with
synthetic array antennas in Tx and Rx
• Ray path identification by deterministic
approach based on the SAGE (Ref. [1])
– Successive Interference Cancellation type
implementation
Submission
Slide 4
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Channel measurement technique (2)
• Spherical wave array mode vector was
used (Ref: [2])
• Derived ray path parameters
– DOD, DOA, TOA, curvature radius of the
spherical wave and variation of spectra with
respect to amplitude and phase
Submission
Slide 5
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Specifications of experiment
• 3.1 to 10.6 GHz
• Angular resolution: 10 deg in both Tx and
Rx sides
• Antennas: wideband monopole antennas
• SNR at the receiver: about 30 dB
• Calibration: use a function of the VNA
• Measurement site: LOS in a typical home
environment in Japan (Ref: [3])
Submission
Slide 6
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Measurement site
Submission
Slide 7
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Submission
Slide 8
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Identification of the detected paths
Submission
Slide 9
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Submission
Slide 10
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Spatio-temporal characteristics of identified paths
(100 waves) and their clusterization
Submission
Slide 11
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Clusterization procedure
• The whole paths were clusterized
intuitively by human recognition on the
delay-angular map.
• We can observe sub-clusters in clusters A
and E (expressed in red lines).
Submission
Slide 12
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Clusters A
Reflection from the window
(including window glass
and metal frame)
Submission
Slide 13
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Cluster B
Reflection from the
displays
Submission
Slide 14
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Cluster C
Reflection from adjacent
room through wooden
door
Submission
Slide 15
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Cluster D
Ceiling, floor and door
reflection (includes two
bounces, ex. ceiling/door)
Submission
Slide 16
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Clusters E
Reflection from the window
(including window glass
and metal frame)
Submission
Slide 17
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Intra-cluster properties
Cluster
Mean
Spread
(containing
multipaths)
Angular
Delay
Angular
Delay
Mean
power
A (18)
85.74
27.26
17.77
1.57
-100.21
B (34)
231.92
22.31
8.96
3.22
-98.93
C (4)
269.63
30.61
1.37
1.86
-105.36
D (22)
270.14
20.00
1.90
1.36
-98.76
E (18)
305.92
22.21
4.50
1.38
-100.50
* Units are angle: deg, delay: ns, power: dBm.
Submission
Slide 18
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Findings on the clusters
• Spatio-temporal clusters are determined by a physical
structure of the environment.
– Specular reflections or specular diffractions are the dominant
mechanisms.
• Spatial and temporal characteristics are highly correlated.
• Delay spread of the reflected waves from one scatterer
is related to the
– Height of the room, if more than two bounces are considered
(scatterer bounce + ceiling or floor reflection)
– Size of the scatterer
Submission
Slide 19
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Extracted power
Submission
Slide 20
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Spatio-temporal spectrum from
measured data and estimated 100 waves
Red: Spectrum of measured data
Green: Detected paths by the SAGE
Submission
Slide 21
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Residual spectrum after the
extraction of 100 waves
Red: Residual spectrum
Submission
Slide 22
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Spatio-temporal characteristics of identified paths
(100 waves) and their clusterization
Submission
Slide 23
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Residual components after the extraction of
100 waves
-110 dBm
-115 dBm
-120 dBm
-125 dBm
Submission
Slide 24
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Findings on the residual components
• About 30 % of the measured power still
remains unextracted even if 100 waves
were extracted by the SAGE.
• The residual component = diffuse
scattering which is hard to characterize by
our deterministic approach.
• Further investigations on the diffuse
components should be continued.
Submission
Slide 25
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
Summary
• Paths and clusters identification based on
the physical phenomena.
• Whole received power was divided into
the deterministic components (70%) and
the diffuse components (30%).
• Site-specific models are appropriate if the
indoor UWB channels are simulated, i.e.
ray tracing + diffuse scattering.
Submission
Slide 26
Communications Research Laboratory
doc.: IEEE 802.15-04-0112-01-004a
March 2004
References
• Channel measurement system:
[1] Haneda et. al., UWBST2003, Reston, VA, USA,
Nov. 2003.
[2] Haneda et. al., accepted for IWUWBS joint
with UWBST 2004, Kyoto, Japan, May 2004.
• Channel measurement result:
[3] Haneda et. al., submitted to WPMC04, Padova, Italy,
Sept. 2004.
Submission
Slide 27
Communications Research Laboratory