UWB PHY Status Update and Discussion on Modulation and Preamble Code Selection

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: TG4a UWB PHY status on July 20th, 2005 IEEE SF Date Submitted: July 21th, 2005 Source: Philippe Rouzet (STMicroelectronics) Contact: Philippe Rouzet Voice: +41-22-929-5866, E-Mail: philippe.rouzet@st.com Abstract: Intermediate status of UWB PHY activity at IEEE SF, as of July 20th Purpose: To provide a basis for further discussion PHY UWB and possibly resolution of issues and selection of modulation and preamble code 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. Philippe Rouzet (STM)

2. UWB PHY sub-groups As a reminder, the Technical Sub-Editors (TSE) and the liaison to IEEE 802.19 coexistence are: 1) Bandplan TSE: Saeid Safavi 2) Pulse modulation TSE: Phil Orlik 3) Pulse compression techniques TSE: Ismail Lakkis 4) Simulation TSE: Matt Wellborn 5) Sub-GHz UWB-PHY TSE: Mark Jamtgaard 6) Liaison to IEEE 802.19 Patricia Martigne Philippe Rouzet (STM)

3. Bandplan • The list of criteria for Bandplan Selection has been approved (doc 05/0355r03 with 11 criteria ), after discussion and approval of a couple of modifications • No presentations were made about the alternate bandplans to the one previously selected at Cairn’s • The Bandplan approved at Cairn’s has been confirmed after voting (selection among a list of proposed bandplans presented in doc 05/0389r02, 78 % in favor ). • No further activity planned at SF’s Philippe Rouzet (STM)

4. Pulse Modulation (1/2) • The list of criteria for Modulation has been presented, 1 technical modification has been discussed and accepted, then the list has been approved by unanimous consent (doc 05/0424r1 ) • New presentations of possible modulations have been shown by their authors (3 presentations): 5/0231r7, 05/0428r0 , 05/0429r00 • It remains to put all proposed modulations in the criteria table for easiness of comparison. • It is desirable to progress in the discussion to resolve potential issues and prepare the selection of the appropriate modulation. Among others: • Usage of modulation for non coherent receivers • Modulation and channel coding • … Philippe Rouzet (STM)

5. Pulse Modulation (2/2) • Approved Modification • 05/0424r0 in criteria 3, replace existing text with “peak to peak voltage shall be specified, one volt peak to peak or less is preferable”. Philippe Rouzet (STM)

6. Pulse Compression (1/4) • The list of criteria for Pulse Compression has been approved by unanimous consent (doc 05/0379r02 Pulse Compression Criteria for UWB PHY. ) • Two presentations of possible coding for preamble have been shown by their authors • Proposal 1 05/0456 r0 • Proposal 2 05/0337r02 • It remains to put the proposed schemes in the criteria table for easiness of comparison. • Huan Bang Li: Presented Document 05/0440r0 Results and Feasibility of DSS UWB with optional CSS UWB. Discussion on this will continue during next Pulse Modulation slot Philippe Rouzet (STM)

7. Pulse Compression (2/4) • It is desirable to progress in the discussion to resolve potential issues and prepare the selection of the appropriate coding scheme. Among others: • For proposal 1: • Place of the start delimiter • Order of the +, - symbols in the code sequence • Usage of the proposed sequence for ranging messages (variable length preamble) • Spectral lines in long sequences? • For proposal 2: • Present simulation results (e.g. autocorrelation/ crosscorrelation properties Philippe Rouzet (STM)

8. Pulse Compression (3/4) • It is desirable to progress in the discussion to resolve potential issues and prepare the selection of the appropriate coding scheme. Among others: • For both proposals : • Define the next steps for defining the appropriate codes for data Philippe Rouzet (STM)

9. Pulse Compression (4/4) • A motion has been unanimously approved to adopt the format of preamble S field as defined in document 0456 01, together with the summary definition as per slide 12 (title “summary (preamble only) • It is confirmed that this S preamble format is applicable for communication and ranging, in all 3 modes (coherent, diff. coherent, non coherent) • New work will start to define the data symbol format Philippe Rouzet (STM)

10. Sub-GHz UWB PHY • A presentation of a possible solution for sub–GHz PHY has been made (doc 5/0390r1) • A straw poll has indicated that more technical information is desired to approve the current proposed solution or move to a modified or new one • One proposal is to align with the list of criteria for bandplan, modulation and pulse compression as defined for UWB PHY above 3 GHz, with the appropriate modifications. • Sub GHz UWB Phy sub technical Editor agrees and will present a list of criteria together with the corresponding selected parameters of proposition presented in doc 5/0390r1 Philippe Rouzet (STM)

11. Misc. • Two points have been mentionned or discussed: • Interoperability between coherent and non coherent devices. Current situation is: • All devices must be capable of both PRFs (low and High , see doc 05/0456r 01) • The mode of operation is decided above the MAC • In a given network (e.g. cell), only one mode exists at a time • Need to discuss on other topics (e.g. PHY PPDU Header etc…) • Next UWB PHY slot (Thursday July 21th) will be dedicated to • Pulse modulation • Mandatory data rate discussion • Channel Model update Philippe Rouzet (STM)