doc IEEE 802 15 04 0112 00 004

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Project: IEEE P 802. 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. 4 a 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 IEEE 802. 15 TG 4 a] Submission Title: Date Submitted: Source: Company Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission Slide 1 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Path-Loss Exponents of Ultra Wideband Signals in Line-of-Sight Environments 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 -00 -004 a 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 -00 -004 a 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 -00 -004 a 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 -00 -004 a 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 d. B • 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 -00 -004 a March 2004 Measurement site Submission Slide 7 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Submission Slide 8 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Identification of the detected paths Submission Slide 9 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Submission Slide 10 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a 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 -00 -004 a 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 -00 -004 a 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 -00 -004 a March 2004 Cluster B Reflection from the displays Submission Slide 14 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a March 2004 Cluster C Reflection from adjacent room through wooden door Submission Slide 15 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a 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 -00 -004 a 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 -00 -004 a March 2004 Intra-cluster properties Cluster Mean Spread (containing multipaths) 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: d. Bm. Submission Slide 18 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a 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 -00 -004 a March 2004 Extracted power Submission Slide 20 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a 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 -00 -004 a 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 -00 -004 a 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 -00 -004 a March 2004 Residual components after the extraction of 100 waves -110 d. Bm -115 d. Bm -120 d. Bm -125 d. Bm Submission Slide 24 Communications Research Laboratory

doc. : IEEE 802. 15 -04 -0112 -00 -004 a 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 -00 -004 a 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 -00 -004 a March 2004 References • Channel measurement system: [1] Haneda et. al. , UWBST 2003, 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 WPMC 04, Padova, Italy, Sept. 2004. Submission Slide 27 Communications Research Laboratory