doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 1 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: [13 Jan, 2004] Source: [Francois Chin, Lei Zhongding, Sam Kwok, Manjeet Singh] 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

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 2 The sequences are related to each other through cyclic shifts and/or conjugation (i.e., inversion of odd-indexed chip values) Proposed Symbol-to-Chip Mapping (8-chip Code Set C 8 ) Decimal ValueBinary SymbolChip Value (Root – 5C)

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 3 Other Root Sequences (8-chip C 8 for Coherent Despreading only) The following Root Sequences are found through exhaustive search with identical low cross correlation and autocorrelation, in base 10:

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 4 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; Source b-proposal-preamble-struture-ieee b-phy

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 5 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; Source b-proposal-preamble-struture-ieee b-phy

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 6 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) Source b-proposal-preamble-struture-ieee b-phy

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 7 Nonlinear PA Characteristics Source b-proposal-preamble-struture-ieee b-phy

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 8 Impact of PA Nonlinearity: 4x sampling rate (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. (1) (2) (3) Source b-proposal-preamble-struture-ieee b-phy

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 9 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;

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 10 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’) and the chip sequence will be [ ]

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 11 Auto-correlation of un-modulated COBI-8 Snapshot Of Normalized Correlation Values with 6 octet as example

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 12 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 Synchronisation Performance

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 13 Synchronisation Performance

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 14 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 –50,000 packets for Monte-Carlo simulation –No Sync error –Non-coherent demodulation –No SFD detection System Performance

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 15 AWGN

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 16 Non-Coherent Receiver

doc.: IEEE b Submission Jan 2005 Francois Chin, Institute for Infocomm Research (I 2 R) Slide 17 Coherent Receiver