Park et al. May, 2009 Submission doc.: IEEE g Project: IEEE P 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:[ ], FAX: [], Re: [IEEE P g] Abstract:[This document provides constant amplitude multi-rate DSSS for smart utility networks] Purpose:[Discussion in 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 Slide 1.

Park et al. May, 2009 Submission doc.: IEEE g 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

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

Park et al. May, 2009 Submission doc.: IEEE g Slide 4 1. Motivation  Challenges  Higher (Multiple) data rate supports  Coexistence with 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

Park et al. May, 2009 Submission doc.: IEEE g 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 IEEE O-QPSK PHY CA-CDM (CA-DSSS)

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

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

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

Park et al. May, 2009 Submission doc.: IEEE g 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

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

Park et al. May, 2009 Submission doc.: IEEE g Slide 11 Data symbol (Binary) b 0 b 1 b 2 p Chip Values c 0 c 1 c 2 c Mapping Table

Park et al. May, 2009 Submission doc.: IEEE g Slide 12 Characteristics Similar structure to IEEE 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

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