1. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Constant Amplitude Multi-Rate DSSS for Smart Utility Networks] Date Submitted: [May, 2009] Source: [Tae-Joon Park, Wun-Cheol Jeong, Kyo-Hoon Son, Hoyong Kang, Seong-Soon Joo, Jong-Suk Chae (ETRI)] Address [] Voice:[+82-42-860-6902], FAX: [], E-Mail:[tjpark@etri.re.kr] Re: [IEEE P802.15.4g] Abstract:[This document provides constant amplitude multi-rate DSSS for smart utility networks] Purpose:[Discussion in 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. Slide 1.

2. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 2 Constant Amplitude Multi-Rate DSSS for Smart Utility Networks Tae-Joon Park, Wun-Cheol Jeong, Kyo-Hoon Son, Hoyong Kang, Seong-Soon Joo, Jong-Suk Chae ETRI

3. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 3 Contents 1.Motivation 2.Modulator Diagram 3.CA-DSSS Modulation 4.Summary

4. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 4 1. Motivation  Challenges  Higher (Multiple) data rate supports  Coexistence with 15.4-2006 legacy devices  Simple and cost-effective PHY spec.  Proposed PHY 1.Data rates Multi rates covering low to high speed connections 2.Backward compatibility Coexisting with 15.4 PHY based networks 3.Low power and cost-effectiveness Simple RF circuitry Low power RF AMP due to constant envelop input

5. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 5 2. Modulator Diagram ① Basic Rate ② Extended Rate Bit-to- Symbol Symbol- to-Chip O-QPSK Modulator Modulated Signal Binary Data From PPDU b4b4 v4v4 1 2 IEEE802.15.4 O-QPSK PHY CA-CDM (CA-DSSS)

6. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 6 3. CA-DSSS Modulation Support Data Rates –Basic Rates : r ∈ {100, 250} kbps IEEE802.15.4 compatible (≤ 127 Bytes) DSSS PHY O-QPSK –Extended Rate : 750 kbps CA-CDM(Constant Amplitude Code Division Multiplex)

7. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 7 Basic Rates Data rates: r ∈ {100, 250} Kbps DSSS PHY O-QPSK of IEEE802.15.4 –Symbol-to-chip mapping table is the same as that of IEEE802.15.4-2006 O-QPSK PHY Specification provides Normally CRC-16, Optionally CRC-32 Coexist with legacy IEEE802.15.4 PHY devices PHY (MHz) Spreading parametersData parameters Chip rate (kchip/s) Modulation Bit rate (kb/s) Symbol rate (ksymbol/s) Symbols 868/915 400O-QPSK1002516-ary Orthogonal 1000O-QPSK25062.516-ary Orthogonal 24502000O-QPSK25062.516-ary Orthogonal - IEEE802.15.4-2006

8. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 8 Extended Rate PHY (MHz) Spreading parametersData parameters Chip rate (kchip/s) Modulation Bit rate (kb/s) Symbol rate (ksymbol/s) Symbols 868/9151000O-QPSK750250 4-ary Orthogonal, CA-CDM 24502000O-QPSK750250 4-ary Orthogonal, CA-CDM Data rate: 750Kbps CA-CDM –Binary modulated output chips  Low power and cost effective Similar to IEEE802.15.4 modulator –Adding a new symbol-to-chip mapping table of CA-DSSS for CA-CDM

9. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g b4b4 c4c4 S/P b0b0 a0a0 b1b1 a1a1 b2b2 a2a2 b3b3 a3a3 Σ c4c4 P/S b0b0 a0a0 b1b1 a1a1 b2b2 a2a2 b3b3 a3a3 Σ Σ Σ Σ Decision b4b4 CA-CDM Transmitter & Receiver Ex) Transmitter Receiver

10. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Transmitter example b4b4 c4c4 S/P b0b0 a0a0 b1b1 a1a1 b2b2 a2a2 b3b3 a3a3 Σ CA-CDM CDM

11. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 11 Data symbol (Binary) b 0 b 1 b 2 p Chip Values c 0 c 1 c 2 c 3 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 Mapping Table

12. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g Slide 12 Characteristics Similar structure to IEEE 802.15.4 modulator –No drastic changes in modulator structure –Reuse of 15.4 modulation for basic rates support –Simple addition of symbol-to-chip mapping table with CA-CDM’s for extended rate support Constant envelop output signal –Simple RF circuitry –Low power RF AMP due to constant envelop input –Conventional Multi-code CDM Linear sum of multiple orthogonal codes Large amplitude fluctuation Highly linear amplifier is required Simple (de)modulator structure

13. Park et al. May, 2009 Submission doc.: IEEE 802.15-09-0301-01-004g 4. Summary CA-DSSS supports multiple data rates. CA-DSSS is compatible to market proved IEEE 802.15.4 PHY devices. CA-DSSS simplifies (de)modulator structure substantially. Low power RF AMP lowers the cost of transceivers.