March 2004 Communications Research Laboratory Slide 1 doc.: IEEE 802.15-04-0112-01-004a Submission Project: IEEE P802.15 Working Group for Wireless Personal

March 2004

Communications Research LaboratorySlide 1

doc.: IEEE 802.15-04-0112-01-004a

Submission

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

Submission Title: [Spatio-Temporal UWB Propagation Channel Characterization]Date Submitted: [14 March, 2004]Source: [Katsuyuki Haneda (1), Jun-ichi Takada (1) and Takehiko Kobayashi (2)]Company [(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) [email protected] ]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]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 802.15-04-0112-01-004a

Submission

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 RikutaCommunications Research Laboratory

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doc.: IEEE 802.15-04-0112-01-004a

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Table of contents• Spatio-temporal channel measurement tech

nique

• Specifications of experiment

• Measurement site

• Path identification results

• Clusters in spatio-temporal domain and their relation to physical structure of the environment

• Diffuse scattering

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doc.: IEEE 802.15-04-0112-01-004a

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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

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doc.: IEEE 802.15-04-0112-01-004a

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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

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doc.: IEEE 802.15-04-0112-01-004a

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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])

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Measurement site

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Identification of the detected paths

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Spatio-temporal characteristics of identified paths (100 waves) and their clusterization

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Clusterization procedure

• The whole paths were clusterized intuitivel

y by human recognition on the delay-angul

ar map.

• We can observe sub-clusters in clusters A

and E (expressed in red lines).

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Reflection from the window (including window glass and metal frame)

Clusters A

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Reflection from the displays

Cluster B

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Reflection from adjacent room through wooden door

Cluster C

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Ceiling, floor and door reflection (includes two bounces, ex. ceiling/door)

Cluster D

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Reflection from the window (including window glass and metal frame)

Clusters E

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Intra-cluster properties

Cluster (containing multipaths)

A (18)

B (34)

C (4)

D (22)

E (18)

Mean

Angular Delay

Spread

Angular Delay

85.74

231.92

269.63

270.14

305.92

27.26

22.31

30.61

20.00

22.21

17.77

8.96

1.37

1.90

4.50

1.57

3.22

1.86

1.36

1.38

Mean power

-100.21

-98.93

-105.36

-98.76

-100.50

* Units are angle: deg, delay: ns, power: dBm.

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Findings on the clusters

• Spatio-temporal clusters are determined by a physical structure of the environment.– Specular reflections or specular diffractions are the dominant me

chanisms.

• 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 (sc

atterer bounce + ceiling or floor reflection)

– Size of the scatterer

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Extracted power

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Spatio-temporal spectrum from measured data and estimated 100 waves

Red: Spectrum of measured data

Green: Detected paths by the SAGE

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Residual spectrum after the extraction of 100 waves

Red: Residual spectrum

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Spatio-temporal characteristics of identified paths (100 waves) and their clusterization

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-115 dBm

-110 dBm

-120 dBm

Residual components after the extraction of 100 waves

-125 dBm

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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.

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doc.: IEEE 802.15-04-0112-01-004a

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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.

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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.

Documents

March 2004 Communications Research Laboratory Slide 1 doc.: IEEE 802.15-04-0112-01-004a Submission Project: IEEE P802.15 Working Group for Wireless Personal