1. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [CSS Comment Resolution of Sponsor Ballot] Date Submitted: [Nov. 2006] Source: [(1) Kyung-Kuk Lee (2) Rainer Hach] Company [(1) Orthotron Co., Ltd., (2) Nanotron Technologies] Address [(1) 709 Kranz Techono, 5442-1 Sangdaewon-dong, Jungwon-gu, Sungnam-si, Kyungki-do, Korea 462-120, (2) Alt-Moabit 60, 10555 Berlin, Germany] Voice:[(1) 82-31-777-8198, (2) +49 30 399 954 207 ], FAX: [], E-Mail: [(1) kyunglee@orthotron.com, (2) r.hach@nanotron.com] Re: [] Abstract:[] Purpose:[Submit Comment Resolution of SB] 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.

2. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 2 20g Comment 1987900023: 6.5a.5.1 Comment 1987800023: 6.5a.4.6 Comment 1987700023: 6.5a.4.6 QPSK Output phase sequence does not agree with mapper input sequence and Table 26c symbol map, i.e. (-1+j) is mapped to -pi/2 in the example and pi/2 in Table 26c Accept in principle The example will be reworked due to comment 1928800023

3. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 3 Comment 1987600023: 6.5a.2.2 bit

4. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 4 Comment 1987500023: 6.5a.2.1 6.5a.2.5

5. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 5 Comment 1983200023: 6.5a.5.1 The value of 0.0025 implies about 0.5 dB amplitude and 4 degree phase RMS accuracy. This seems too strict for low cost devices, sometimes measured through an integral : Additional Editorial 0.005

6. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 6 Floating-Point SpectrumFixed-Point (4-bit) Spectrum Properties of Quantized CSS Signal

7. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 7 Floating-Point WaveformFixed-Point (4-bit) Waveform (MSE = 0.0041) Properties of Quantized CSS Signal

8. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 8 Comment 1983000023: 6.5a.4.3 Comment 1982900023: 6.5a.2.6 The text says "The constant tau(m) is either added or subtracted", however eq. 1b shows (1-(-1)^n)tau(m) which means that the delay is eithen not added or added twice The use of QPSK differential encoding, although improves robustness to frequency offsets, incurs a significant sensitivity degradation due to "squaring loss" effect when used after a low-rate encoder The commenter states concern about sensitivity degradation of DQPSK. This statement is true for a very simple and straightforward combination of the demodulator and decoder. However it is envisioned that by known techniques a siginificant part of the sensitivity loss can be recovered with reasonable extra effort. Comment 1983100023: 6.5a.5.1 Accept: Replace by is either „not added or added twice“ Proposed Reject.

9. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 9 Comment 1981500023: Figure E28 and E29 Comment 1982800023: 6.5a.4.3 In equation 1a, since chirp is described, the time should probably be squared. Proposed Reject The commenter obviously has strong experience and a very accurate feeling and expectation on the behaviour of 802.11b/g and 802.15.4 in practice. The effect observed by the commenter might be caused by the assumptions made in Table E1 on the shapes of the transmit spectra and receive filters which at some point might be too conservative. Unfortunately the assumptions and conditions for these simulations have been subject of numerous discussions with TAG19 and thus cannot be changed easily. We apologize if some gap between simulation and reality remains.

10. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 10 Comment 1970800023: 6.5a.5.1 Comment 1970700023: 6.5a.5.1 Comment 1970600023: 6.5a.5.1 Recommended Measurement Conditions: - Resolution BW: 100 KHz - Video BW: 1 KHz Need to add measurement conditions, as in 6.8a.11.2 incorrect inequality sign - does not tie up with fig 20g range is at least strangely specified and may be completely wrong. I think you are trying to say "between 11 and 22MHz"

11. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 11 Comment 1970500023: 6.5a.5.1 Comment 1970400023: 6.5a.4.3 Comment 1970300023: page 55 Using |f| does not give a response normalised on the centre frequency. Applies several times in this para. Need to Re-alignment Bit 9 …Bit 11

12. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 12 Comment 1970200023: page 49

13. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 13 Comment 1970100023: 6.5a.2.2 bit

14. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 14 Comment 1953100023: 6.5a.4.3 Comment 1953000023: 6.5a.2.6 Comment 1940400023: 6.5a &these time and frequency parameters are assumed to be derived from a reference crystal in a locked manner&'. Is this trying to say that ppm error in chirp sub-band centre frequencies, in chirp rate, and time gaps should all be equal? Feedback memory of 4 does not seem to be explained by the equation for DQPSK output - nowhere in the equation references the fourth sample back in memory The 2450MHz CSS physical layer violates the PAR. Comment 1933600023: E6.5 typo "sytstems" Add the following reference to the first paragraph of 6.5a.2.6: For a detailed explanation of the index variables n and k, please see 6.5a.4.3 Accept in principle

15. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 15 Comment 1932100023: 6.5a.5.4 Comment 1932000023: 6.5a.5.4 Comment 1931900023: 6.5a.2.2 non-overlapping upper

16. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 16 Comment 1928900023: 6.5a.4.2 Comment 1928800023: 6.5a.4.6 replace "more orthogonal" with "increase effective span of the vector space" Orthogonal is a absolute. replace 1 1 0 1 0 0 with 0 1 0 1 1 0 and rework the example based on this Table 26a shows that this choice generates all possible combinations of phase and is more illustrative than the example given where the subchirp coefficients degrade to only -1-j and -1+j Accept, Replace Input data: 0 1 0 1 1 0 Demux, I: 0 0 1, Q: 1 1 0 Serial to parallel, I: { 0 0 1}, Q{ 1 1 0} Bi-orthogonal Mapping (r=3/4), I : 1 -1 1 -1 Q : -1 -1 1 1 P/S and QPSK symbol mapping, Mapper Input: (1-j), (-1-j), (1+j),(-1+j) QPSK Output Phase: -π/2, π, 0, π/2 D-QPSK Coding (Initial phase of 4 feedback memory for D-QPSK are all π/4) -π/4, -3π/4, π/4, 3π/4 Sub-chirp sequence of D-QCSK output: [exp(-jπ/4) * subchirp(k=1), exp(-j3/4 π) * subchirp(k=2), exp(jπ/4) * subchirp(k=3), exp(j3/4 π) * subchirp(k=4)] The time gaps are chosen to “give the four different sub-chirp sequences more orthogonallity”. by “to make the four sequences even closer to being orthogonal” Accept in principle, replace

17. doc.: IEEE802. 15-06-0448-03-004a Submission 2006. 11. Kyung-Kuk Lee, Rainer Hach Slide 17 Comment 1850100023: All Comment 1847300023: page 49 Comment 1847200023: page 42 Please look over the use of italics and upright text within the equations of this draft. Same with Comment 1970200023 same with comment 1987500023 Need to upgrade