doc.: IEEE 802.15-<doc#> <month year> <month year> doc.: IEEE 802.15-<doc#> doc.: IEEE 802.15-<doc#> 01/01/2019 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Suggestions for Harmonization of the DSSS PHY] Date Submitted: [ December 2009 ] Source: [Michael Schmidt, David Howard, Liang Li,Tae-Joon Park, Seong-Soon Joo, Wun-Cheol Jeong, Jong-Suk Chae, Kuor Hsin Chang, Scott Weikel, Clint Powell, Rick Enns] Company: [Atmel, On-Ramp Wireless, Vinno/Huawei, ETRI, Elster Electricity, Consultants] E-Mail: [michael.schmidt@atmel.com, david.howard@onrampwireless.com, liang_1@yahoo.com, tjpark@etri.re.kr, ssjoo@etri.re.kr, wjeong@etri.re.kr, jschae@etri.re.kr, kuor-hsin.chang@us.elster.com, scott.j.weikel@us.elster.com, cpowell@ieee.org, enns@stanfordalumni.org] Re: [ TG4g ] Abstract: Purpose: Suggestions for Harmonization of the DSSS PHY 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. Page 1 <author>, <company> <author>, <company>

Goals DSSS proposal to meet requirements of TG4g PAR 01/01/2019 Goals DSSS proposal to meet requirements of TG4g PAR Support interoperability with 2.4 and sub GHz legacy Explicit support for NA, Europe, Korea, China Complement to FSK and OFDM proposals

(2) single spreading scheme for (SHR, PHR) (preamble) 01/01/2019 O-QPSK Modulator Binary Data From PSDU CC ½(1) Interleaving(1) DSSS CA-CDM (SHR,PHR) Preamble DSSS(2) Notes: (1) is optional for CA-CDM (Constant Amplitude Code Division Multiplex) (2) single spreading scheme for (SHR, PHR) (preamble)

Agreements Support for 802.15.4-2006 OQPSK for 915 and 2450 MHz 01/01/2019 Agreements Support for 802.15.4-2006 OQPSK for 915 and 2450 MHz Reference modulator Outer Forward Error Correction Coding & interleaving (optional for CA-CDM) Single preamble for .4g modes Frequency bands and channel plan

Further Efforts Harmonization spreading modes Mode selection mechanism 01/01/2019 Further Efforts Harmonization spreading modes Mode selection mechanism Best method to support for 802.15.4- 2006 OQPSK (915 and 2450 MHz)

01/01/2019 IEEE 802.15.4 -OQPSK support OQPSK with RC (raised cosine) shaping only Nyquist so EVM requirements are not violated In contrast to half-sine shaping, there are no MSK-like spectral side-lobes addressing issues with 915/2450 MHz IEEE-802.15.4- OQPSK signals (reduced ACI, out-of-band emissions at band- edge). No interoperability issues with legacy devices Give up GMSK and Pre-coding Simplify

Harmonization of Spreading Modes for legacy and non-legacy Modes 01/01/2019 Harmonization of Spreading Modes for legacy and non-legacy Modes Pip Attribute called “phy{Name}SpreadingMode” with values “DSSS” or “CA-CDM” Both non-legacy modes apply the same (SHR, PHR) structure with simple (N,1) spreading Both non-legacy modes can be distinguished by a dedicated SFD value. Both SFD values need to be defined Problems related to IQ images are less relevant due to the PN nature of preamble (see doc #824)

Harmonization of Spreading Modes for legacy and non-legacy Modes 01/01/2019 Harmonization of Spreading Modes for legacy and non-legacy Modes

DSSS-Non-legacy Modes for 915 MHz 01/01/2019 DSSS-Non-legacy Modes for 915 MHz Chip Rate: 1000 kchip/s (SHR,PHR) (64,1) spreading PSDU Modes RateMode DSSS-Code ½ CC FEC + interleaver Data rate [kbps] (16,1) yes 31.25 1 (16,4) * Legacy code 125 2 (8,4) 250 3 none 500

01/01/2019 DSSS-Modes for 915 MHz The (16,4) DSSS code is equivalent to the IEEE-802.15.4 legacy O-QPSK code for 915 MHz. So the legacy mode can be enabled by bypassing the CC-FEC and interleaver and prepending the legacy (SHR,PHR) with (16,4) spreading. Preamble of legacy mode and non-legacy mode can be sensed at the same time since the RF-bandwidth is the same. The (8,4) code is the code given in doc #738 with optimal Hamming distance of 4 (extended BCH code).

CA-CDM-Non-legacy Modes for 915 MHz 01/01/2019 CA-CDM-Non-legacy Modes for 915 MHz Chip Rate: 1000 kchip/s (SHR,PHR) (64,1) spreading PSDU Modes RateMode CA-CDM-Code(TPC+ Hadamard spreading) ½ CC FEC + Interleaver Data rate [kbps] (64,8) yes 62.5 1 (32,8) 125 2 none 250 3 (16,9) 500(562.5)

01/01/2019 CA-CDM-Modes for 915 MHz CA-CDM is composed of (4,3)x(4,3) TPC (Turbo Product Code) and Hadamard spreader (4,3)x(4,3) TPC The horizontal code is the first order Reed-Muller code (Hadamard code). The vertical code is the odd parity check code. Iterative decoding can be employed to enhance the code performance. High spreading gain. CA-CDM-Code (4,3)x(4,3) TPC Minimum Distance Spreading gain (dB) Data rate [kbps] (64,8) 4 12.0 62.5 (32,8) 9.0 250 / 125 (16,9) 6.0 500(562.5)

DSSS-Non-legacy Modes for 2450 MHz 01/01/2019 DSSS-Non-legacy Modes for 2450 MHz Chip Rate: 1000 2000 kchip/s (SHR,PHR) (64,1) (128,1) spreading PSDU Modes RateMode DSSS-Code ½ CC FEC + interleaver Data rate [kbps] (16,1) (32,1) yes 31.25 1 (16,4) (32,4) * Legacy code 125 2 (8,4) (16,4) 250 3 none (8,4) 500

01/01/2019 DSSS-Modes for 2450 MHz The (32,4) DSSS code is equivalent to the IEEE-802.15.4 legacy O-QPSK code for 2450 MHz. So the legacy mode can be turned on by bypassing FEC and interleaver and prepending the legacy (SHR,PHR) with (32,4) spreading. Preamble of legacy mode and non-legacy mode for this band can be sensed at the same time since the RF-bandwidth is the same. The (16,4) code is the legacy code of 915 MHz. The (8,4) code is the code given in doc #738 with optimal Hamming distance of 4 (extended BCH code). Performance simulations of the non-legacy DSSS modes showed similar results for 915 MHz and 2450 MHz (AWGN, ITU-B) for a given RateMode.

CA-CDM-Modes for 2450 MHz Chip Rate: 2000 kchip/s (SHR,PHR) 01/01/2019 CA-CDM-Modes for 2450 MHz Chip Rate: 2000 kchip/s (SHR,PHR) (128,1) spreading PSDU Modes RateMode CA-CDM-Code(TPC+ Hadamard spreading) ½ CC FEC + interleaver Data rate [kbps] (128,8) yes 62.5 1 (64,8) 125 2 none 250 3 (32,9) 500(562.5)

01/01/2019 CA-CDM-Modes for 2450 MHz CA-CDM is composed of (4,3)x(4,3) TPC (Turbo Product Code) and Hadamard spreader (4,3)x(4,3) TPC The horizontal code is the first order Reed-Muller code (Hadamard code). The vertical code is the odd parity check code. Iterative decoding can be employed to enhance the code performance. High spreading gain. CA-CDM-Code (4,3)x(4,3) TPC Minimum Distance Spreading gain (dB) Data rate [kbps] (128,8) 4 15.0 62.5 (64,8) 12.0 250 / 125 (32,9) 9.0 500(562.5)

01/01/2019 Name of the PHY The name “SUN-DSSS PHY” is not appropriate for various reasons: This PHY is a multi-rate PHY supporting various data rate by different spreading modes. We have “DSSS” spreading, “CA-CDM” spreading or no spreading at all (e.g. refer to DSSS 915MHz mode 3 – 500kbps). Spreading is not unique for this PHY, since it is also utilized by the OFDM PHY (frequency spreading). “SUN” might be problematic with SUN micro systems. A suggested name is MR-OQPSK PHY. This is in accordance with the name "MR-FSK PHY“ (MR = Multi Rate).