1. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 1 Chang-Soon Choi, NICT Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Two-path channel model for wireless desktop applications] Date Submitted: [March, 2006] Source: [Hirokazu Sawada, Chang-Soon Choi, Yozo Shoji and Hiroyo Ogawa] Company [National Institute of Information and Communications Technology (NICT)] Address [3-4, Hikarino-Oka, Yokosuka, Kanagawa, 239-0847, Japan] Voice:[+81.46.847.5096], FAX: [+81.46.847.5079], E-Mail:[sawahiro@nict.go.jp, cschoi@nict.go.jp, shoji@nict.go.jp and hogawa@nict.go.jp] Re: [] Abstract:[This contribution describes a two-path channel model for wireless desktop applications.] Purpose:[Contribution to mmW TG3c meeting.] 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.

2. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 2 Chang-Soon Choi, NICT Two-path channel model for wireless desktop applications Hirokazu Sawada, Chang-Soon Choi, Yozo Shoji and Hiroyo Ogawa National Institute of Information and Communications Technology (NiCT), Japan

3. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 3 Chang-Soon Choi, NICT Motivation - S-V model - S-V model has the difficulty to express wireless desktop applications - No parameters describing height dependence - Complex - Simple two-path model is proposed for these applications. L = number of clusters; K l = number of multipath components (number of rays) in the l-th cluster; = multipath gain coefficient of the k-th ray in the l-th cluster; T l = arrival time of the first ray of the l-th cluster;  k,l = delay of the k-th ray within the l-th cluster relative to the first path arrival time, T l ; Ref: IEEE 802.15-05-0412-00-003c

4. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 4 Chang-Soon Choi, NICT Two-path model example 1: High quality video/image sharing h1h1 Tx h2h2 L d1d1 d2d2 Rx Desk - Usage: Short-range communications in desktop environments - Line of Sight (LOS) conditions - Application scenario: high quality video/image sharing

5. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 5 Chang-Soon Choi, NICT Two-path model example 2: Hot-spot service scenario Tx L d1d1 d2d2 Rx Desk h2h2 Wall - Application scenario: hot-spot service

6. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 6 Chang-Soon Choi, NICT - Simple two-path model L d1d1 d2d2 Direct Reflected h1h1 h2h2 for directly transmitted signal for reflected signal from the ground CIR h(t) = complex impulse response (CIR), transmitter signal c = velocity of light T = Arrival time for directly transmitted signal = Arrival time for reflected signal from the ground = Reflection coefficient Proposed two-path model - Two-path model is suitable to express height dependence. - Two-path model is deterministic and simple.

7. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 7 Chang-Soon Choi, NICT Path loss under proposed two-path model If, Approximation - Path loss of two-path model = path length difference = wavelength of electromagnetic wave d 1 - d 2 Receiver height, h 2 [mm] Path loss, P r /P t [dB] Two-path Free-space h1=150mm L=3m f=62.5GHz Fig. Calculated path loss vs. receiver height

8. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 8 Chang-Soon Choi, NICT Experimental verification h 1 =150mm h 2 =100 ～ 200 mm L=3 m Tx Rx 2 m 0.7 m Wooden table - Experimental conditions

9. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 9 Chang-Soon Choi, NICT Experimental conditions: photograph Rx side Tx side InstrumentHP8510C VNA Sweep frequency61-64GHz # of frequency points801 Distance resolution191mm The number of average times 128 Table sizeWooden, 1.2m×3.6m, Height: 0.7m Room size2.7m×15m×13m AntennaConical horn antenna Experimental conditions Distance resolution (191mm) was limited by measurement equipments 3m

10. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 10 Chang-Soon Choi, NICT TX-Rx AntennaConical Horn Antenna Beam width60 deg (E-plane) 60 deg (H-plane) PolarizationVertical wave Out-view Antenna pattern Conical horn antenna

11. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 11 Chang-Soon Choi, NICT Results: Path loss vs. receiver height Receiver antenna height [mm] Path loss [dB] Meas. Two-path Free-space - Proposed two-path model is suitable to express the height dependence in wireless desktop environments (cf. difficult in S-V model)

12. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 12 Chang-Soon Choi, NICT Typical response under low path-loss conditions - Two rays are 26.7dB higher than other multipath rays - Measured frequency response is well-matched to calculated one Time [ns] h 1 =150mm h 2 =125mm Relative power [dB] 26.7dB Path loss [dB] Frequency [GHz] Two rays are included Measured Calculated Fig. Power Delay Profile (PDP) Fig. Frequency Response -Two-path model is suitable to model this condition h 2 =125mm h 1 =150mm

13. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 13 Chang-Soon Choi, NICT Time [ns] Relative power [dB] 10.7dB h 1 =150mm h 2 =100mm Frequency [GHz] Path loss [dB] h 1 =150mm Measured Calculated h 2 =125mm - Two-rays are only 10.7dB higher than other multipath rays - Severe frequency fading effects can be observed -Two-path model + S-V model is required Fig. Power Delay Profile (PDP) Fig. Frequency Response frequency selective fading Two rays are included Typical response under high path-loss conditions

14. doc.: IEEE 802. 15-06-0109-00-003c Submission March 2006 Slide 14 Chang-Soon Choi, NICT Summary - Two-path model is proposed for wireless desktop applications 1) Two-path model is suitable to express height dependence of transceiver. 2) Under low path-loss condition, two-path model is suitable. 3) Under high path-loss condition, two-path model + S-V model is required. - Two-path model should be included in mmW channel models