doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> May 2005 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: How to realize the low data rate in CSS Date Submitted: [] Source: Rainer Hach Company: Nanotron Technologies Address: Alt-Moabit 61, 10555 Berlin, Germany Voice: +49 30 399 954 207 E-Mail: r.hach@nanotron.com Re: [] Abstract: [] Purpose: material to be discussed 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. Hach, Nanotron <author>, <company>

The actual 1Mb/s mode 2 x 3 information bits are May 2005 The actual 1Mb/s mode 2 x 3 information bits are mapped onto 2 x 4 code bits. 2 x 4 code bits are modulated onto 1 chirp symbol by using DQPSK Modulator (1 Mb/s) Data-rate: 1 Mb/s S/P Symbol Mapper P/S Mapper QPSK Binary Data 1 3 3 4 1 S/P 1 1 2 2 S/P Symbol Mapper P/S 1 3 3 4 1 DBO-QCSS Signal CSK Gen. 2450 MHz PHY modulation 8-ary Differentially Bi-Orthogonal Quaternary-Chirp-Spread-Spectrum (DBO-QCSS) Modulator for 1 Mb/s Data-rate Hach, Nanotron

Actual mapping scheme ham_dist = 0 2 2 2 4 2 2 2 2 0 2 2 2 4 2 2 May 2005 Actual mapping scheme ham_dist = 0 2 2 2 4 2 2 2 2 0 2 2 2 4 2 2 2 2 0 2 2 2 4 2 2 2 2 0 2 2 2 4 4 2 2 2 0 2 2 2 2 4 2 2 2 0 2 2 2 2 4 2 2 2 0 2 2 2 2 4 2 2 2 0 avg_dist = 2.2857 8-ary Bi-Orthogonal Symbol Mapping Table Decimal (m) Binary (b0,b1,b2) Bi-Orthogonal Code (01,02,03,04) 0 000 1 001 2 010 3 011 4 100 5 101 6 110 7 111 1 1 1 1 1 -1 1 -1 1 1 -1 -1 1 -1 -1 1 -1 -1 -1 -1 -1 1 -1 1 -1 -1 1 1 -1 1 1 -1 Hach, Nanotron

The actual proposal for lower data rate May 2005 The actual proposal for lower data rate 1 x 3 information bits are Mapped onto the 4 code bits. 4 code bits are modulated onto 1 chirp symbol by using DBPSK Modulator (250 Kb/s) Data-rate: 250 kb/s Binary Data FEC Encoder r=1/2 S/P Symbol Mapper P/S 1 1 1 1 3 3 4 1 1 DBO-BCSS Signal CSK Gen. 2450 MHz PHY modulation 8-ary Differentially Bi-Orthogonal Binary-Chirp-Spread-Spectrum (DBO-QCSS) Modulator for 250 Kb/s Data-rate Hach, Nanotron

Lower data rate by modified mapping scheme (1) May 2005 Lower data rate by modified mapping scheme (1) 4-ary Symbol Mapping Table ham_dist = 0 3 2 3 3 0 3 2 2 3 0 3 3 2 3 0 avg_dist = 2.6667 Decimal (m) Binary (b0,b1) Bi-Orthogonal Code (01,02,03,04) 0 00 1 01 2 10 3 11 1, 1,-1,-1 1,-1, 1, 1 -1, 1,-1, 1 -1,-1, 1,-1 Effective Data rate: 2 bits /6us = 330 kBit/s Hach, Nanotron

Lower data rate by modified mapping scheme (2) May 2005 Lower data rate by modified mapping scheme (2) 4-ary Symbol Mapping Table Decimal (m) Binary (b0,b1) Bi-Orthogonal Code (01,02,03,04) ham_dist = 0 4 4 0 avg_dist = 4 0 00 1 01 1, 1, 1, 1 -1,-1,-1,-1 Effective Data rate: 1 bits /6us = 165 kBit/s Pro Original code words We achieve lower rate by taking something away Con Doesn‘t meet the 250 kBit Hach, Nanotron