January 2011 Doc IEEE 802 15 11 0063

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January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Project: IEEE P 802.

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ UWB PHY 15. 6 D 2 Comment-Resolutions ] Date Submitted: [] Source: [ Marco Hernandez ] Company: [NICT] Address: [3 -4 Hikarino-oka, Yokosuka, 239 -0847, Japan] Voice: [+81 46 -847 -5439] Fax: [+81 46 -847 -5431] E-Mail: [] Re: [In response to the comment-resolution process of 1 st letter ballot of 802. 15. 4 f] Abstract: [] Purpose: [Material for discussion in technical comments to the UWB PHY] 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 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S 10 -017 • Comment: The synchronization symbol for SFD may produce confusion as the preamble sequences have elements {0, 1}. • Proposed changed: Replace inversion of bits: 0 to 1, 1 to 0. Submission Slide 2 by to indicate Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S 10 -019 • Comment: Static scrambling is no needed as the LFSR used for TH can be employed for dynamic scrambling with better spectrum characteristics. • Proposed change: Replace static scrambling by dynamic scrambling. Submission Slide 3 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Pulse

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Pulse waveform • Burst pulse option has an spectrum with spikes that cause a large backup in amplifiers. Solution: randomize data. • There was a long discussion about this. LETI/FT want to use fixed sequences, while I initially and TI later suggested dynamic scrambling. We made a compromise: DPSK modulations employ static scrambling and on-off modulation employs dynamic scrambling. Submission Slide 4 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Static

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Static scrambling • Dynamic scrambling Submission Slide 5 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The LFSR used for TH and dynamic chip scrambling is there for both modulations anyhow. We can use it for dynamic scrambling for both modulations as well. • Moreover, the spectral characteristics of dynamic scrambling is better than static scrambling. Submission Slide 6 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 D 2 Comment S 10 -018 • Comment: The SDF for on-off modulation is too long for practical purposes. • Proposed change: Replace current SFD by Submission Slide 7 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Current

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Current SFD for on-off modulation: • • There was a misunderstanding in the meaning of symbol –Si. As it was proposed for DPSK modulations, it was interpreted as a change of polarity. For on-off modulation, energy detection does not have polarity. • However, –Si means inversion of bits: (0 ->1, 1 ->0). Submission Slide 8 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Assuming

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Assuming the SHR as • and energy-detection front-end: Submission Slide 9 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The correlation properties of SHR respect to S 1(high SNR): Submission Slide 10 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution The correlation

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution The correlation properties of SHR respect to Submission Slide 11 (high SNR): Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • During

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • During preamble detection the SFD is undetected. • During SFD detection, the preamble is undetected. • The SHR is more efficient as Submission Slide 12 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Assuming

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • Assuming the SHR as • and energy-detection front-end: Submission Slide 13 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The correlation properties of SHR respect to S 1(high SNR): Submission Slide 14 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The correlation properties of SHR respect to SFD template [S 0, S 1 S 0] (high SNR): Submission Slide 15 Marco H. , NICT

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The

January 2011 Doc: IEEE 802. 15 -11 -0063 -01 -0006 Proposed Resolution • The detection of SFD has to be done with S 1 only (with further processing to discard the preamble) or to change the SFD template similar to 4 a. • It is far more efficient to use: Submission Slide 16 Marco H. , NICT