1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Jan 2005
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [COBI-8 with Offset QPSK for b High Rate Alt-PHY for 868MHz band]
Date Submitted: [6 Jan, 2004]
Source: [Francois Chin] Company: [Institute for Infocomm Research, Singapore]
Address: [21 Heng Mui Keng Terrace, Singapore ]
Voice: [ ] FAX: [ ]
Re: [Response to the call for proposal of IEEE b, Doc Number: b]
Abstract: [This presentation compares all proposals for the IEEE b PHY standard.]
Purpose: [Proposal to IEEE b Task Group]
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
Francois Chin, Institute for Infocomm Research (I2R)
<author>, <company>

2. Proposed Symbol-to-Chip Mapping (8-chip Code Set C8)
Jan 2005
Proposed Symbol-to-Chip Mapping (8-chip Code Set C8)
Decimal Value
Binary Symbol
Chip Value
0000
(Root – 5C) 1
1000 2
0100 3
1100 4
0010 5
1010 6
0110 7
1110 8
0001 9
1001 10
0101 11
1101 12
0011 13
1011 14
0111 15
1111
The sequences are related to each other through cyclic shifts and/or conjugation (i.e., inversion of odd-indexed chip values)
Francois Chin, Institute for Infocomm Research (I2R)

3. Other Root Sequences (8-chip C8 for Coherent Despreading only)
Jan 2005
Other Root Sequences (8-chip C8 for Coherent Despreading only)
The following Root Sequences are found through exhaustive search with identical low cross correlation and autocorrelation, in base 10:
Francois Chin, Institute for Infocomm Research (I2R)

4. Simulation models –At least 10000 random channel realizations;
Jan 2005
Simulation models
Discrete exponential channel model
–-Sampled version of diffuse channel model offer by Paul with 4x sampling rate;
–At least random channel realizations;
–PER calculated on 20 bytes PPDUs with preamble;
Francois Chin, Institute for Infocomm Research (I2R)

5. Proposal for preamble Preamble of 15.4 standard:
Jan 2005
Proposal for preamble
Preamble of 15.4 standard:
Preamble here proposed for 15.4b 868MHz consists of 8 octets
(each octet comprises the least significant symbol ‘0000’ and the most significant symbol ’0111’)
Francois Chin, Institute for Infocomm Research (I2R)

6. Auto-correlation of un-modulated COBI-8
Jan 2005
Auto-correlation of un-modulated COBI-8
Snapshot Of Normalized Correlation Values with 6 octet as example
Francois Chin, Institute for Infocomm Research (I2R)

7. Synchronisation Performance
Jan 2005
Synchronisation Performance
Simulation parameters & assumptions:
AWGN
O-QPSK + half-sine pulse shaping + Transmit filtering Raised cosine (r=0.2)
4x 1.6MHz (chip rate = 400kcps)
Frequency offset 30ppm
Francois Chin, Institute for Infocomm Research (I2R)

8. Synchronisation Performance
Jan 2005
Synchronisation Performance
Francois Chin, Institute for Infocomm Research (I2R)

9. System performance Simulation parameters & assumptions:
Jan 2005
System performance
Simulation parameters & assumptions:
Flat fading & 250ns rms delay spread Rayleigh Channel model
O-QPSK modulation + half sine pulse + Transmit filtering Raised cosine (r=0.2 & 0.6)
20 octets in each packet
50,000 packets for Monte-Carlo simulation
No Sync error
Non-coherent demodulation
No SFD detection
Francois Chin, Institute for Infocomm Research (I2R)

10. Jan 2005
AWGN, Rolloff = 0.2
Francois Chin, Institute for Infocomm Research (I2R)

11. Non-Coherent, Rolloff = 0.2
Jan 2005
Non-Coherent, Rolloff = 0.2
Francois Chin, Institute for Infocomm Research (I2R)

12. Jan 2005
Coherent, Rolloff = 0.2
Francois Chin, Institute for Infocomm Research (I2R)

13. Jan 2005
AWGN, Rolloff = 0.6
Francois Chin, Institute for Infocomm Research (I2R)

14. Non-Coherent, Rolloff = 0.6
Jan 2005
Non-Coherent, Rolloff = 0.6
Francois Chin, Institute for Infocomm Research (I2R)

15. Jan 2005
Coherent, Rolloff = 0.6
Francois Chin, Institute for Infocomm Research (I2R)