doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> Jan 2005 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: [17 Jan, 2004] Source: [Francois Chin, Lei Zhongding, Sam Kwok, Manjeet Singh] 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) <author>, <company>

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 0 1 0 1 1 1 0 0 (Root – 5C) 1 1000 0 0 1 0 1 1 1 0 2 0100 0 0 0 1 0 1 1 1 3 1100 1 0 0 0 1 0 1 1 4 0010 1 1 0 0 0 1 0 1 5 1010 1 1 1 0 0 0 1 0 6 0110 0 1 1 1 0 0 0 1 7 1110 1 0 1 1 1 0 0 0 8 0001 0 0 0 0 1 0 0 1 9 1001 1 0 0 0 0 1 0 0 10 0101 0 1 0 0 0 0 1 0 11 1101 0 0 1 0 0 0 0 1 12 0011 1 0 0 1 0 0 0 0 13 1011 0 1 0 0 1 0 0 0 14 0111 0 0 1 0 0 1 0 0 15 1111 0 0 0 1 0 0 1 0 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)

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: 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)

Frequency Response– raised cosine filter r=0.2 Jan 2005 Source - 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy Frequency Response– raised cosine filter r=0.2 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 250kHz pass band; 3, Tx digital FIR filter; 4, 8 taps; Francois Chin, Institute for Infocomm Research (I2R)

Impulse response of Tx filter – raised cosine filter r=0.2 Jan 2005 Source - 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy Impulse response of Tx filter – raised cosine filter r=0.2 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 250kHz pass band; 3, Tx digital FIR filter; 4, 8 taps; Francois Chin, Institute for Infocomm Research (I2R)

PSD for Half-sine with Tx filter Jan 2005 Source - 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy PSD for Half-sine with Tx filter 100kbps; 400k chip rate; 600k bandwidth; half sine pulse shape; 8 taps FIR Tx filter; Raised cosine filter with r=0.2; 4x over sampling rate; (1.6M sampling rate) Francois Chin, Institute for Infocomm Research (I2R)

Nonlinear PA Characteristics Jan 2005 Source - 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy Nonlinear PA Characteristics Francois Chin, Institute for Infocomm Research (I2R)

Impact of PA Nonlinearity: 4x sampling rate Jan 2005 Source - 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy Impact of PA Nonlinearity: 4x sampling rate (2) (1) (1) Tx PSD without Tx filter or PA (2) Tx PSD with Tx filter, no PA (3) Tx PSD with Tx filter and PA At 4x sampling rate, the impact of PA nonlinearity is neglectable. (3) Francois Chin, Institute for Infocomm Research (I2R)

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

Proposal for preamble Preamble of 15.4 standard: Jan 2005 Proposal for preamble Preamble of 15.4 standard: Preamble proposed for COBI-8 consists of 8 octets (each octet comprises the least significant symbol ‘0000’ and the most significant symbol ’0111’) and the chip sequence will be [-1 1 -1 1 1 1 -1 -1 -1 -1 1 -1 -1 1 -1 -1 ] Francois Chin, Institute for Infocomm Research (I2R)

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)

Synchronisation Performance Jan 2005 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) No Frequency offset Francois Chin, Institute for Infocomm Research (I2R)

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

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) 20 octets in each packet 20,000 packets for Monte-Carlo simulation No Sync error Non-coherent demodulation No SFD detection Francois Chin, Institute for Infocomm Research (I2R)

AWGN Jan 2005 Enhanced COBI-8 differs from DSSS by ~ 2dB due to quasi-orthogonal cross correlation among the sequences Francois Chin, Institute for Infocomm Research (I2R)

AWGN: Ideal Sync. vs. Correlation Sync. Jan 2005 Source: 15-04-0628-03-004b-proposal-preamble-struture-ieee-802-15-4b-phy AWGN: Ideal Sync. vs. Correlation Sync. DSSS performance from previous page matches this Packet Number: 10000 PSDU Length: 20 Byte Tx/Rx Over Sample Rate: 2 Channel Over Sample Rate: 4 Frame Detection: No SFD: No Francois Chin, Institute for Infocomm Research (I2R)

Non-Coherent Receiver Jan 2005 Non-Coherent Receiver Francois Chin, Institute for Infocomm Research (I2R)

Jan 2005 Coherent Receiver Francois Chin, Institute for Infocomm Research (I2R)