doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> May 2010 Project: IEEE P802.15 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 138632] Voice: [65-6408-2530] FAX: [] E-Mail: [chinfrancois@i2r.a-star.edu.sg, kwokys@i2r.a-star.edu.sg zhangliang@vinnotech.com] Re: [Response to the call for proposal of IEEE 802.15.4G] Abstract: [This presentation compares all proposals for the IEEE802.15.4G standard.] Purpose: [Proposal to IEEE 802.15.4G 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. I2R, Vinno <author>, <company>

May 2010 Motivation 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. I2R, Vinno

Current C(8,4) in Std draft May 2010 Current C(8,4) in Std draft Decimal Value Binary Symbol Chip Value 0000 00000001 1 1000 11010000 2 0100 01101000 3 1100 10111001 4 0010 11100101 5 1010 00110100 6 0110 10001100 7 1110 01011101 8 0001 10100010 9 1001 01110011 10 0101 11001011 11 1101 00011010 12 0011 01000110 13 1011 10010111 14 0111 00101111 15 1111 11111110 I2R, Vinno

Cross-correlation Characteristics for Current C(8,4) in Std draft May 2010 Cross-correlation Characteristics for Current C(8,4) in Std draft (a) cross-correlations of all 16 COBI-C8 codes (b) cross-correlation of one COBI-C8 code No modulation; no over-sampling (all in real numbers) I2R, Vinno

Cross-correlation Characteristics for Current C (8,4) in Std draft May 2010 Cross-correlation Characteristics for Current C (8,4) in Std draft (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) I2R, Vinno

Proposed New Symbol-to-Chip Mapping (8-chip Code Set C8) May 2010 Proposed New 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 odd-bit inversion. The first 8 and last symbols are both shifted versions of each other . I2R, Vinno

Other Root Sequences (8-chip C8 for Coherent Despreading only) May 2010 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 I2R, Vinno

Cross-correlation Characteristics for Proposed C8 May 2010 Cross-correlation Characteristics for Proposed C8 (a) cross-correlations of all 16 COBI-C8 codes (b) cross-correlation of one COBI-C8 code No modulation; no over-sampling (all in real numbers) I2R, Vinno

Cross-correlation Characteristics for Proposed C8 May 2010 Cross-correlation Characteristics for Proposed C8 (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) I2R, Vinno

Autocorrelation Characteristics of C8 May 2010 Autocorrelation Characteristics of C8 Autocorrelation of all 16 COBI-C8 sequences No modulation; no over-sampling (all in real numbers) I2R, Vinno

Autocorrelation Characteristics of C8 May 2010 Autocorrelation Characteristics of C8 Autocorrelation of all 16 COBI-C8 sequences O-QPSK modulation; 2x over-sampling (complex domain) I2R, Vinno

System Performance Simulation parameters & assumptions: May 2010 System Performance 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 I2R, Vinno

Performance Comparison (BER) <month year> doc.: IEEE 802.15-<doc#> May 2010 Performance Comparison (BER) I2R, Vinno <author>, <company>

Performance Comparison (PER) <month year> doc.: IEEE 802.15-<doc#> May 2010 Performance Comparison (PER) I2R, Vinno <author>, <company>

Summary and Suggestion May 2010 Summary and Suggestion New proposed COBI-C8 can support low-complexity non-coherent receiver Suggestion: Adopt New Cobi-C8 chip sequence and instead of the current C(8,4) sequence in draft. I2R, Vinno