doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [New C(8,4) chip sequence for Multi-rate OQPSK Modulation ] Date Submitted: [12, May, 2010] Source: [Francois Chin, Yuen-Sam Kwok, Liang Zhang, Liang Li, Tao Xin, Haitao Liu] Company: [Institute for Infocomm Research, Singapore, Vinno, Huawei, SIMIT] Address: [1 Fusionopolis Way #21-01 Connexis South Tower, Singapore ] Voice: [ ] FAX: [] Re: [Response to the call for proposal of IEEE G] Abstract:[This presentation compares all proposals for the IEEE G standard.] Purpose:[Proposal to IEEE G 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 g Submission May 2010 I 2 R, Vinno Slide 2 Current (8,4)-DSSS code sequence for high rate mode does not support non-coherent receiver. It is desirable choose a code sequences that supports low- complexity non-coherent receiver. Motivation

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 3 The sequences are related to each other through cyclic shifts and odd-bit inversion Proposed New Symbol-to-Chip Mapping (8-chip Code Set C 8 ) Decimal ValueBinary SymbolChip Value (Root – 5C)

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 4 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 g Submission May 2010 I 2 R, Vinno Slide 5 Cross-correlation Characteristics for Proposed C 8 No modulation; no over-sampling (all in real numbers) (a) cross-correlations of all 16 COBI-C8 codes(b) cross-correlation of one COBI-C8 code

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 6 (a) cross-correlations of all 16 COBI-C8 codes(b) cross-correlation of one COBI-C8 code With O-QPSK modulation; 2x over-sampling (complex domain) Cross-correlation Characteristics for Proposed C 8

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 7 Autocorrelation Characteristics of C 8 Autocorrelation of all 16 COBI-C8 sequences No modulation; no over-sampling (all in real numbers)

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 8 Autocorrelation Characteristics of C 8 Autocorrelation of all 16 COBI-C8 sequences O-QPSK modulation; 2x over-sampling (complex domain)

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 9 Cross-correlation Characteristics for Current C(8,4) in Std draft No modulation; no over-sampling (all in real numbers) (a) cross-correlations of all 16 COBI-C8 codes(b) cross-correlation of one COBI-C8 code

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 10 (a) cross-correlations of all 16 COBI-C8 codes(b) cross-correlation of one COBI-C8 code With O-QPSK modulation; 2x over-sampling (complex domain) Cross-correlation Characteristics for Current C (8,4) in Std draft

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 11 Simulation parameters & assumptions: –O-QPSK + Raised cosine pulse shape with roll-off factor = 0.8 –20 octets in each packet –20,000 packets for Monte-Carlo simulation –No Sync error –No SFD detection –Both Coherent and Non-coherent demodulation System Performance

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 12 Performance Comparison (BER)

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 13 Performance Comparison (PER)

doc.: IEEE g Submission May 2010 I 2 R, Vinno Slide 14 New proposed COBI-C 8 can support low-complexity non- coherent receiver Summary