1. 5 May 2019
5 mai 2019
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: TG4a UWB PHY preamble/modulation status on Sept 22th, 2005 IEEE Garden Grove
Date Submitted: Sept 22th, 2005
Source: Philippe Rouzet (STMicroelectronics)
Contact: Philippe Rouzet TG4a UWB Technical Editor
Voice: ,
Abstract: Intermediate status of UWB PHY activity at IEEE GG, as of Sept. 19th
Purpose: To provide a basis for further discussions and meetings in 15.4a PHY UWB group during IEEE Garden Grove session Sept To help prepare simulations for codes and timing selection before mid October 2005.
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
Philippe Rouzet (STM)
Philippe Rouzet

2. To help prepare discussion on LDC
5 mai 2019
Purpose
To help prepare simulations for codes, FEC and timings selection before mid October 2005.
To help prepare discussion on LDC
Philippe Rouzet (STM)

3. Preamble Structure Preamble Header Payload SYNC/CE SYNC SFD S S S S S
5 mai 2019
Preamble Structure
Preamble
Header
Payload
SYNC/CE
SYNC
SFD S S S S S S S -S or -S -S -S S S S
SYNC : Synchronization Field
SFD : Start Frame Delimiter Field
CE : Channel Estimation Filed
NOTE : Only the content of S field is specified (not the polarity or placement within the preamble)
Preamble length : 50 us, or 500 us or 4 ms
Philippe Rouzet (STM)

4. Preamble Code Structure
5 mai 2019
Preamble Code Structure
Ternary Codes (length 31) S1 S2 S3 S4 S5 S6
Ternary Codes (length 127) S1 S2 S3 S4 S5
Philippe Rouzet (STM)

5. Differentially Coherent
5 mai 2019
Summary (Preamble)
Ternary Modulation
Coherent Ternary
Non-Coherent Ternary
Differentially Coherent
LPRF
a1. Peak PRF (MHz)
247
a2. Average PRF (MHz)
123.5
code duration (microseconds)
4.02
0.51
HPRF
30.875
1.00
Preamble length is an integer multiple of the S field
Mandatory Low PRF Mode
Adaptive Peak PRF (mechanism TBD) : MHz & MHz
All devices should support both PRFs
Codes : the set of 6 PBTSs (1) of length 31 (within a cyclic shift)
Optional High PRF
Peak PRF : 247 MHz
Codes : the set of 5 PBTSs of length 127 (within a cyclic shift)
(1) Perfect Balanced Ternary Sequences
Philippe Rouzet (STM)

6. Data Modulation *PEAK PRF values are given as an example
5 mai 2019
Data Modulation
*PEAK PRF values are
given as an example
Currently 3 values are
being discussed:
61.750
247
494
S codes and semi-symbols
(12 first of 16 bursts)
are both continuously
scrambled
Length of air symbols
will be determined after
the FEC is defined * *
S positionned within the 12 first slots, 4 last slots always 0
Philippe Rouzet (STM)

7. About timings and other parameters to be defined
5 mai 2019
About timings and other parameters to be defined
Pulse shape to be chosen
Preamble:
duration known (thus PHY Sync/Header “almost known”)
S field polarity to be fixed (auto/cross correlation properties, spectrum smoothing)
S field position within Preamble to be fixed (same )
Data modulation:
Scrambler selected (?)
Target data rates fixed  …
PEAK PRF to be determined (values and number of PRFs)
FEC to be selected (both for Coherent and Non Coherent)
In addition, Interframe Spacing must also be discussed
THEN
(In-Air) Frame duration (function of payload and preamble types) can be determined
 Hypothesis on LDC ( function of typical applications) can be elaborated
Philippe Rouzet (STM)