1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Comment resolutions for CID#821 and #1220]
Date Submitted: [June 17, 2010]
Source: [Takaaki Hatauchi1, Hendricus De Ruijter2, Hiroshi Harada3, Fumihide Kojima3, Ryuhei Funada3, Sum Chin Sean3, Kazuo Kubo4, Tomonori Sato5, Kentaro Sakamoto6, Aiichiro Kashiwagi7, Takahiro Banno8, Hirohito Nishiyama9]
Company [1Fuji Electric, 2Silicon Laboratories, 3NICT, 4Panasonic, 5Toshiba Toko Meter Systems, 6Tokyo Gas, 7Osaka Gas, 8Toho Gas, 9Mitsubishi Electric Corp.]
Address [11, Fuji-machi, Hino-city, Tokyo, , Japan]
Voice: [ ], FAX: [ ],
Re: [TG4g comment resolution]
Abstract: [Comment resolutions for CID #821 and #1220 related to preamble in 4-FSK]
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.
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2. <month year>
doc.: IEEE <doc#>
Summary
This document describes the proposed resolution on the comments related to preamble in 4-FSK modulation.
The following comments are addressed;
CID#821 and #1220.
Page 2
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3. Comment resolution CID#821 CID#1220
“The preamble for 4GFSK is not explicitly specified.”
CID#1220
“SHR shall never be sent in 4(G)FSK modulation, and it should be avoided for PHR as well.”
Proposed resolution (for both comments)
Accept in principle: “SHR (preamble and SFD) shall be modulated in 2 level FSK or GFSK. Only PHR and PSDU shall be modulated in 4 level FSK or GFSK.”
Rationale
Preamble shall be modulated in 2 level, in order for receiver to work properly (AFC and signal detection).
SFD shall be modulated in 2 level as well, as it is designed to work in 2 level modulation and it also provides more robustness.
PHR shall be modulated in 4 level, as modulation order is not specified in PHR and interoperability issue would be solved at MAC and higher layer.

4. Proposed changes to the draft
6.12a.1.2 Bit-to-symbol mapping
Insert the following paragraph and figure “In case that 4 level FSK/GFSK is used, only PHR and PSDU shall be encoded in 4 levels. SHR shall be encoded in 2 levels at half the data rate and at triple the modulation index. PPDU encoding for 4 FSK/GFSK is shown in Figure A.”
Figure A – PPDU encoding for 4FSK/GFSK