1. Submission Title: [SFD comparison] Date Submitted: [18−July−2006]
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [SFD comparison]
Date Submitted: [18−July−2006]
Source: [Michael Mc Laughlin] Company [Decawave Ltd.]
Address [25 Meadowfield, Sandyford, Dublin 18, Ireland]
Voice:[+353−1− ], FAX: [What’s a FAX?], E−Mail:
Re: [ a.]
Abstract: [Compares properties of two SFDs which have been proposed]
Purpose: [To promote discussion in a.]
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(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
Mc Laughlin, Decawave

2. July 2006
Two SFDs which have been proposed are compared by looking at the correlator outputs.
The two sequences are:
V = −0−+0−00 −0−+0− − − − −−−0−
Y = +−000−0+ 0−− −+00−00 +−−−−0− − −++0 −+−−−000
where a + sign indicates a positive preamble sequence, a – sign indicates a negative preamble sequence and a 0 indicates 31 (or 127) zeros.
Mc Laughlin, Decawave

3. July 2006
Sequence V correlator output using Length 31 code 3 as inner code
Mc Laughlin, Decawave

4. July 2006
Sequence Y correlator output using Length 31 code 3 as inner code
Mc Laughlin, Decawave

5. July 2006
Sequence V correlator output using Length 31 code 2 as inner code
Mc Laughlin, Decawave

6. July 2006
Sequence Y correlator output using Length 31 code 2 as inner code
Mc Laughlin, Decawave

7. Lots of -2 outputs before the main output
July 2006
Sequence V correlator output using Length 31 code 2 as inner code
Lots of -2 outputs before the main output
Mc Laughlin, Decawave

8. This is the only -2 before the main output
July 2006
Sequence Y correlator output using Length 31 code 2 as inner code
This is the only -2 before the main output
Mc Laughlin, Decawave

9. July 2006
Non – coherent
The non coherent results were compared also, and show almost identical results
Mc Laughlin, Decawave

10. Conclusions (coherent case)
July 2006
Conclusions (coherent case)
Both will work very well for coherent with the long detector
Sequence V has the advantage of two outputs for the short detector
Sequence Y has the advantage of only one -2 output compared to lots for sequence V before the +4 for the short detector
Mc Laughlin, Decawave