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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS) Submission Title: [UWB: a solution for location awareness in TG4 applications]

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Presentation on theme: "Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS) Submission Title: [UWB: a solution for location awareness in TG4 applications]"— Presentation transcript:

1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANS) Submission Title: [UWB: a solution for location awareness in TG4 applications] Date Submitted: [January 2003] Revised: [14 January 2002] Source: [Roberto Aiello] Company [Discrete Time Communications] [Vern Brethour] Company [Time Domain] Uri Kareev Company [Pulsicom Technologies], Re: [UWB for location awareness] Abstract: [This presentation is an introduction to UWB for location awareness for TG4 applications.] Purpose: [Tutorial contribution] Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual or organization. The material in this document is subject to change in form and content after further study. The contributor reserves 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

2 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 2 UWB: a solution for location awareness in TG4 applications Roberto Aiello Discrete Time Communications Vern Brethour Time Domain Uri Kareev Pulsicom Technologies

3 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 3 Summary TG4 applications that require location awareness Requirements Methods of location estimation Flight time measurements Relevant issues

4 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 4 Application examples Building automation (ease of installation and maintenance) Home automation Inventory (hospital, warehouses, file tracking, etc.) People tracking (resource optimization in offices), optimize efficiency/security in factories, etc.)

5 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 5 Location relevant requirements No mobility or low speed requirement Relatively fast response time for tracking Centimeters to meters resolution and accuracy Low power (long battery lifetime) Low cost

6 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 6 Methods for location awareness Fixed infrastructure –Access points synchronization –Inverse GPS triangulation Ad hoc network –No engineered access points –Only relative distances between nodes are known Ad hoc network with fixed references –Some network nodes fix location and provide reference –2 references to fix in 2D, 3 references to fix in 3D

7 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 7 Location measurement with time of arrival Time of arrival –TX sends UWB signal at time t 0 –RX 1 receives UWB signal at time t 1 –RX 2 receives UWB signal at time t 2 Absolute time of arrival –Calculate distance (TX-RX 1 ) = (t 1 – t 0 )*c –Estimate location with distances –Requires clock synchronization between access points and nodes Relative time of arrival (differential) –Calculate distance difference (d 1 -d 2 ) = (t 1 -t 0 )-(t 2 -t 0 )*c = (t 1 -t 2 )*c –No need for synchronization with the node –Estimate location with curves intercepts –Requires clock synchronization between access points t0t0 RX1 RX2 RX3 RX4 TX t1t1 t3t3 t2t2 t4t4

8 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 8 Time of arrival characteristics Line-Of-Sight –Time of arrival = distance –Resolution inversely proportional to risetime (proportional to bandwidth) –UWB works well for time of arrival measurement Non-Line-Of-Sight –Always catch the earliest path –Additional error caused by difference between shortest radio path and direct path) –Additional error gets better with information from multiple nodes and additional algorithms

9 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 9 Time of arrival performance UWB –10 centimeters accuracy in LOS with minimum processing –Few centimeters accuracy achievable in NLOS with post-processing algorithms Narrowband (ISM or U-NII) –3m accuracy in LOS with minimum processing –Few meters in accuracy achievable in NLOS with post-processing algorithms Location awareness advantages –No location information -> go look for the object –Location information (narrowband) -> go find the object –Location information (UWB) -> go get the object

10 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 10 Example of location measurements (units in mm)

11 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 11 Office trial (units in m)

12 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 12 UWB advantages High accuracy (proportional to bandwidth) Robust to multipath and to interference Low power consumption Leads to low cost implementation

13 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 13 Other issues relevant to TG4 Communication and location potentially require processing different paths Communication and location are probably separate functions Most of location function is PHY related -> no MAC modifications required

14 doc.: IEEE /050r0 Submission January 2003 DTC – TDC - Pulsicom, Aiello - Brethour - KareevSlide 14 Conclusions UWB is a natural technology for location awareness Provides additional feature beyond a communications only platform UWB works in multipath environments where narrow band approaches are challenged


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