1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Juli 2005
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [CSS editing session, SF, tuesday]
Date Submitted: [Juli 19, 2005]
Source: Rainer Hach
Company: Nanotron Technologies
Address: Alt-Moabit 61, Berlin, Germany
Voice:
Re: [15.4a draft]
Abstract: [overview over status and topics under discussion]
Purpose: [Structure for CSS editing time slot]
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
Rainer Hach, Nanotron
<author>, <company>

2. CSS, SF, tuesday Overview over actual word doc Topics under discussion
Juli 2005
CSS, SF, tuesday
Overview over actual word doc
Topics under discussion
Rainer Hach, Nanotron

3. Fine adjustment of timing values
Juli 2005
Fine adjustment of timing values
Timing values are tightly connected with clock and thus crystal values.
What is the optimum crystal value for our system?
Rainer Hach, Nanotron

4. Clock values and sampling rate
Juli 2005
Clock values and sampling rate
Clock and sampling rate values are crucial for power consumption of the system
If the sampling rate is higher than the base clock, an additional PLL is required for synthesizing it
Higher clock increases power consumption of digital circuitry
High sampling rate might decrease power consumption of analog circuitry
Availabilty, price, precision of crystals
Rainer Hach, Nanotron

5. Coding and data rates, reminder
Juli 2005
Coding and data rates, reminder
Two data rates are intended:
1 Mbit/s, which leads to increased
robustness against bursty interference
(even double payload size requires only half of the time of 15.4 packet)
250 kBbit/s after coding leads to increased robustness against constant, noise like interference
Rainer Hach, Nanotron

6. Juli 2005
Coding and data rates
The biorthogonal ¾ code is a cheap way to realize some coding gain for both data rates.
The performance of the code for the low data should be matched with the acquistion performance
=> SHR and PHR have to be determined before the code for the low rate !
Rainer Hach, Nanotron

7. SHR and PHR Preamble: 8 chirp symbols (48us, const phase)
Juli 2005
SHR and PHR
Preamble: 8 chirp symbols (48us, const phase)
SFD: 4 chirp symbols (24 us, sequence tbd)
PHR: 8 chirp symbols (8 bit-length field, plenty of margin for coding and reserved bits )
Rainer Hach, Nanotron