1. doc.: IEEE 15-06-0298-01-004a July, 2006 Project: IEEE 802.15 Study Group for Wireless Personal Area Networks (WPANs) Submission Title: [SFD Design] Date Submitted: [June 2006] Source: [Zafer Sahinoglu]: Company1 [Mitsubishi Electric Research Labs, Inc.] Address [201 Broadway, 8 th floor, Cambridge, MA 02139] Voice: [(617) 621 7588 ] Re: [802.15.4a] Abstract:[] Purpose:[discuss SFD design options] 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 15-06-0298-01-004a July, 2006 Objective There are two SFDs –Short SFD for the high data rate option –Long SFD for the low data rate option Long SFD is redesigned because it was broken in D2 (Thanks to Vern and Francois) There is still a very large margin to improve the long SFD

3. doc.: IEEE 15-06-0298-01-004a July, 2006 The SFD in D3: SFD-B SS1 SS #1 SS #2SS #4SS #2SS #3 SS #4 SFD B

4. doc.: IEEE 15-06-0298-01-004a July, 2006 Correlation Properties of SFD-B SS #1 SS #2SS #4SS #2SS #3 SS #4 SFD B Coherent Side-lobe: 9 Non-Coherent side-lobe: 12 SS #1 = [ - 0 0 0 + - 0 - ] SS #2 = [ + 0 0 0 - + 0 + ] SS #3 = [ 0 - + + 0 0 + 0 ] SS #4 = [ 0 + - - 0 0 - 0 ] SFD-B |SFD-B| 2*|SFD-B|-1

5. doc.: IEEE 15-06-0298-01-004a July, 2006 Suggestion: SFD-V V #1 V #2 SFD V Coherent Side-lobe: 4 Non-Coherent side-lobe: 7 16 Symbols48 Symbols V1 = [-1 0 -1 1 0 -1 0 0] V2 = [0 1 0 1 0 0 -1 1 1 0 0 0 1 -1 0 0 1 0 0 1 -1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 -1 -1 -1 0 -1 1 0 0 0 1 1 0 0] SFD-V |SFD-V| 2*|SFD-V|-1

6. doc.: IEEE 15-06-0298-01-004a July, 2006 Comparison of Short SFD Correlations Preceding preamble symbols factored in.

7. doc.: IEEE 15-06-0298-01-004a July, 2006 Comparison Table Code TypeSide-lobe (Coherent)Side-lobe (Non-Coherent) SFD-B 912 SFD-V 47 Autocorrelation side-lobes of the LONG SFD Code TypeSide-lobe (Coherent)Side-lobe (Non-Coherent) SFD-B 22 SFD-V 22 Autocorrelation side-lobes of the Short SFD

8. doc.: IEEE 15-06-0298-01-004a July, 2006 Summary Suggestion – Adopt SFD V as the long SFD in IEEE for the low data rate option –Adopt the first 8 bits of the SFD V as the short SFD for the high data rate option