May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 1

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

Submission Title: Status report on non-coherent ranging team activitiesDate Submitted: May, 16th 2005Source: Patricia Martigne (responsible for the 802.15.4a sub-group on non-coherent ranging)Company: France Telecom R&DAddress: 28 Chemin du Vieux Chêne – BP98 – 38243 Meylan Cedex - FranceVoice: +33 4 76 76 44 03E-Mail: patricia.martigne@francetelecom.comAbstract: Companion document to doc 15-05-225r1

Purpose: This document is a presentation of the status report included in doc 15-05-225r1 on non-coherent ranging team activity.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

May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 2

Activities within non-coherent ranging team

Need for creation of such a team appeared on the 11/04/2005 Ranging conference call

4 conference calls held (14/04 – 19/04 – 03/05 – 10/05)

Technical discussions happened on :• Leading edge detection importance for ranging• Relevance of OOK in a non-coherent context• Preamble• Time Hopping• Big or small pulse approach• Peak voltage

May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 3

Issues within non-coherent ranging team

Leading edge detection needed for ranging to consider only energy detection receivers (integration resolution in the order of 2ns), not energy collection receivers (integration resolution of 50ns) to have only 1 pulse per chip, and not a burst of pulsesto have the PRF as low as possible (according to FCC and CMOS limitations)

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May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 4

Issues within non-coherent ranging team

Acquisition by non-coherent receivers preamble to be chosen carefully to ensure the

acquisition process is performed in a timely manner (Vern's question on the 17th of May on feasibility for non-coherent receivers to perform ranging with a preamble being no longer than 4ms); may be accompanied by a TH coding

Low complexity, low power consumption, and easy way of setting the threshold :OOK modulation seems to serve all of these purposes for non-coherent receivers

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May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 5

Issues within non-coherent ranging team

Peak voltage limitation given by FCC rules (0dBm/50MHz) and CMOS 90nm

technology (1,2Vpp) to be taken into account for decision on the minimum PRF value

In line with Atlanta's technical agreement non-coherent receivers are to be fully considered :to allow to have only non-coherent receivers, TWR-TOA should be the preferred technique to perform ranging.

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May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 6

Current proposals for non-coherent ranging

"Small pulse voltage" approach

"Big pulse voltage" approach

Complementary use of Time Hopping coding

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May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 7

Proposed work for Cairns

Checking calculation of minimum PRF vs max peak voltage

TH issue (with a view of isolation in SOP condition, smoothing the spectrum, having a time-signature for easier detection of leading edge detection by non-coherent receivers)

Preamble issue

Preferred bandwidth? (500MHz, 1GHz, 1.5GHz)

May 2005

Patricia MARTIGNE

doc.: IEEE 802. 15-05-0317-00-004a

Submission

Slide 8

Proposed work between Cairns and San Francisco

Needed clock? (with consideration of accuracy, time-drifts, cost)

Continuation of discussions initiated in Cairns