1.
Project: IEEE P 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, Sangdaewon-dong, Jungwon-gu, Sungnam-si, Kyungki-do, Korea , (2) Alt-Moabit 60, Berlin, Germany]
Voice:[(1) , (2) ], FAX: [],
[(1) (2)
Re: []
Abstract: []
Purpose: [Submit Comment Resolution of SB]
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
Kyung-Kuk Lee, Rainer Hach

2.
Comment : 6.5a.5.1
20g
Comment : 6.5a.4.6
Comment : 6.5a.4.6
Accept in principle
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
The example will be reworked due to comment
Kyung-Kuk Lee, Rainer Hach

3.
Comment : 6.5a.2.2
bit
Kyung-Kuk Lee, Rainer Hach

4.
Comment : 6.5a.2.1
6.5a.2.5
Kyung-Kuk Lee, Rainer Hach

5. Comment 1983200023: 6.5a.5.1 2006. 11. : Additional Editorial 0.005
The value of 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
Kyung-Kuk Lee, Rainer Hach

6. Properties of Quantized CSS Signal
Properties of Quantized CSS Signal
Floating-Point Spectrum
Fixed-Point (4-bit) Spectrum
Kyung-Kuk Lee, Rainer Hach

7. Fixed-Point (4-bit) Waveform
Properties of Quantized CSS Signal
Floating-Point Waveform
Fixed-Point (4-bit) Waveform
(MSE = )
Kyung-Kuk Lee, Rainer Hach

8. Reject Comment 1983100023: 6.5a.5.1 Comment 1983000023: 6.5a.4.3
Comment : 6.5a.5.1
Comment : 6.5a.4.3
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
Accept: Replace by is either „not added or added twice“
Reject
Comment : 6.5a.2.6
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
Kyung-Kuk Lee, Rainer Hach

9. Comment 1982800023: 6.5a.4.3 Comment 1981500023: Figure E28 and E29
Comment : 6.5a.4.3
In equation 1a, since chirp is described, the time should probably be squared.
Comment : Figure E28 and E29
Reject
The assumptions and conditions for these simulations have been subject of numerous discussions with TAG19.
Kyung-Kuk Lee, Rainer Hach

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

11.
Comment : 6.5a.5.1
Using |f| does not give a response normalised on the centre frequency. Applies several times in this para.
Comment : 6.5a.4.3
Comment : page 55
Need to Re-alignment
Kyung-Kuk Lee, Rainer Hach

12.
Comment : page 49
Kyung-Kuk Lee, Rainer Hach

13.
Comment : 6.5a.2.2
bit
Kyung-Kuk Lee, Rainer Hach

14.
Comment : 6.5a.4.3
&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?
Comment : 6.5a.2.6
Accept in principle
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
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
Comment : 6.5a
The 2450MHz CSS physical layer violates the PAR.
Comment : E6.5
typo "sytstems"
Kyung-Kuk Lee, Rainer Hach

15.
Comment : 6.5a.5.4
Comment : 6.5a.5.4
non-overlapping
Comment : 6.5a.2.2
upper
Kyung-Kuk Lee, Rainer Hach

16.
Comment : 6.5a.4.2
Accept in principle, replace
replace "more orthogonal"
with "increase effective span of the vector space" Orthogonal is a absolute.
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”
Comment : 6.5a.4.6
Accept, Replace
replace with 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
Input data:
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 :
Q :
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)]
Kyung-Kuk Lee, Rainer Hach

17. Comment 1850100023: All Comment 1847300023: page 49
Comment : All
Please look over the use of italics and upright text within the equations of this draft.
Need to upgrade
Comment : page 49
Same with
Comment
Comment : page 42
same with comment
Kyung-Kuk Lee, Rainer Hach