Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [COBI-8 with Offset QPSK for 802.15.4b 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 119613] Voice: [65-6874-5687] FAX: [65-6774-4990] E-Mail: [chinfrancois@i2r.a-star.edu.sg] Re: [Response to the call for proposal of IEEE 802.15.4b, Doc Number: 15-04-0239-00-004b] Abstract: [This presentation compares all proposals for the IEEE802.15.4b PHY standard.] Purpose: [Proposal to IEEE 802.15.4b Task Group] 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. Francois Chin, Institute for Infocomm Research (I2R)

2. Proposed Symbol-to-Chip Mapping (8-chip Code Set C8) 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 C8for Coherent Despreading only) • The following Root Sequences are found through exhaustive search with identical low cross correlation and autocorrelation, in base 10: 9 18 23 29 33 36 46 58 66 71 72 92 111 113 116 123 132 139 142 144 163 183 184 189 197 209 219 222 226 232 237 246 Francois Chin, Institute for Infocomm Research (I2R)

4. Simulation models Discrete exponential channel model –-Sampled version of diffuse channel model offer by Paul with 4x sampling rate; –At least 10000 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: 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 Snapshot Of Normalized Correlation Values with 6 octet as example Francois Chin, Institute for Infocomm Research (I2R)

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

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

9. 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. AWGN, Rolloff = 0.2 Francois Chin, Institute for Infocomm Research (I2R)

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

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

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

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

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