[Sls-rfm] Fw: CCSDS Review of CCSDS 401.0-P-25.1, Radio Frequency and Modulation SystemsPart 1: Earth Stations and Spacecraft - new proposal
Enrico.Vassallo at esa.int
Enrico.Vassallo at esa.int
Tue Jun 28 07:33:27 UTC 2016
Wai,
yes, the mask will remain as is. We only (re)define the applicable lower
frequency limit.
Thanks for your agreement. I will prepare RID disposition and final
version of the recommendation.
Regards, Enrico
From: "Fong, Wai H. (GSFC-5670)" <wai.h.fong at nasa.gov>
To: "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>, "Sank, Victor
J. (GSFC-567.0)[AS and D, Inc.]" <victor.j.sank at nasa.gov>
Cc: "Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>,
"sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>
Date: 27/06/2016 21:47
Subject: Re: [Sls-rfm] Fw: CCSDS Review of CCSDS 401.0-P-25.1,
Radio Frequency and Modulation SystemsPart 1: Earth Stations and
Spacecraft - new proposal
Enrico,
Compromise 1: This is fine.
Compromise 2: "that the phase noise of the communication chain should be
limited according to the mask given in figure 2.4.23-1 for channel symbol
rates equal or above 10 Ms/s for which the lower mask limit shall be 100
Hz; that the same mask should be used for channel symbol rates below 10
Ms/s by setting the lower validity limit in accordance with the mission
channel symbol rate and PLL loop bandwidth.”
This means that Figure 2.4.23-1 remains the same? If so, then the
compromise is fine.
Regards,
Wai Fong, Ph.D.
Communications Engineer
Flight Microwave and Telecommunications Systems Branch
NASA Goddard Space Flight Center
Code 567
Greenbelt, MD 20771
From: Enrico Vassallo <Enrico.Vassallo at esa.int>
Date: Monday, June 27, 2016 at 5:32 AM
To: Victor Sank <victor.j.sank at nasa.gov>, Wai Fong <wai.h.fong at nasa.gov>
Cc: "Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>, "
sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>
Subject: RE: [Sls-rfm] Fw: CCSDS Review of CCSDS 401.0-P-25.1, Radio
Frequency and Modulation SystemsPart 1: Earth Stations and Spacecraft -
new proposal
Victor and Wai,
are you ready to accept my compromise or to further discuss it? I would
like to try and close this review in the next days so that I can send all
the needed documentation to the Secretariat by next Friday.
Please advise, Enrico
From: "Sank, Victor J. (GSFC-567.0)[AS and D, Inc.]" <
victor.j.sank at nasa.gov>
To: "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>, "Fong, Wai
H. (GSFC-5670)" <wai.h.fong at nasa.gov>
Cc: "sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>, "
Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>
Date: 16/06/2016 14:40
Subject: RE: [Sls-rfm] Fw: CCSDS Review of CCSDS 401.0-P-25.1,
Radio Frequency and Modulation SystemsPart 1: Earth Stations and
Spacecraft - new proposal
Enrico,
I just want to state that I was in agreement with Wai but
was negligent in not sending an email. We will discuss your compromise
suggestion.
Thanks,
Victor
From: Sls-rfm [mailto:sls-rfm-bounces at mailman.ccsds.org] On Behalf Of
Enrico.Vassallo at esa.int
Sent: Thursday, June 16, 2016 5:41 AM
To: Fong, Wai H. (GSFC-5670) <wai.h.fong at nasa.gov>
Cc: sls-rfm at mailman.ccsds.org; Marco.Lanucara at esa.int
Subject: [Sls-rfm] Fw: CCSDS Review of CCSDS 401.0-P-25.1, Radio Frequency
and Modulation SystemsPart 1: Earth Stations and Spacecraft - new
proposal
Dear Wai,
nobody else submitted any comments to my first proposal so we are down to
two RIDs where the two of us have a different view.
Here's my compromise proposal. Have a look at it and let me know if it
could be OK for you.
1) MB-01
I partly agree and partly disagree with you.
Disagreement:
Also 16-32-64APSK are defined for the first time in this recommendation
and not in other parts of 401.
Agreement:
It is true that pi/2-BPSK symbols for the frame headers are only defined
and studied so far for the two standards mentioned.
Compromise:
New recommends (6):
“that the use of a frame header (see A1.5) and of QPSK pilot symbols
should be used to improve the acquisition and tracking performance”
The new section A1.5 should be as in the RID but with an initial line
saying that the spec is only for systems compliant with CCSDS 131.2-B-1
and CCSDS 131.2-B-1 and that for systems compliant with CCSDS 131.0-B-2
further work is needed.
We then add the task to the charter.
2) SM-01
Here I also partly agree and partly disagree with you.
Disagreement:
Recommends (7) limits the phase noise mask to channel symbol rates equal
to or above 10 Ms/s. Therefore, using the typical 10^-4 for 2BL/Rs one
gets 1000 Hz, which is already larger than the 100 Hz proposed by the RID
Agreement:
The recommendation does not prevent somebody from using 64-APSK at 100
ks/s. In that case, one would not know which phase noise mask to use.
Compromise:
I would do as we did for another issue in the ECSS standard, linking the
lower integration limit to the mission specific symbol rate and PLL
bandwidth.
Therefore, keeping a factor 10 margin in our pockets, I would propose to
re-write recommends (7)
from
(7) that the phase noise of the communication chain should be
limited according to the mask given in figure 2.4.23-1 for channel symbol
rates equal or above 10 Ms/s;
to
(7) that the phase noise of the communication chain should be
limited according to the mask given in figure 2.4.23-1 for channel symbol
rates equal or above 10 Ms/s for which the lower mask limit shall be 100
Hz; that the same mask should be used for channel symbol rates below 10
Ms/s by setting the lower validity limit in accordance with the mission
channel symbol rate and PLL loop bandwidth.
Would you be able to accept this compromise? The ESA colleagues
originating the RIDs are OK.
Regards, Enrico
----- Forwarded by Enrico Vassallo/esoc/ESA on 16/06/2016 11:17 -----
From: Enrico Vassallo/esoc/ESA
To: "Fong, Wai H. (GSFC-5670)" <wai.h.fong at nasa.gov>
Cc: "Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>, "
Salvador.Marti at esa.int" <Salvador.Marti at esa.int>, "
sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>
Date: 20/05/2016 08:48
Subject: Re: [Sls-rfm] CCSDS Review of CCSDS 401.0-P-25.1, Radio
Frequency and Modulation SystemsPart 1: Earth Stations and Spacecraft
Wai,
your position is noted.
I will open discussion after June 10 waiting for other WG members'
comments.
Regards, Enrico
From: "Fong, Wai H. (GSFC-5670)" <wai.h.fong at nasa.gov>
To: "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>, "
sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>
Cc: "Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>, "
Salvador.Marti at esa.int" <Salvador.Marti at esa.int>
Date: 19/05/2016 20:22
Subject: Re: [Sls-rfm] CCSDS Review of CCSDS 401.0-P-25.1, Radio
Frequency and Modulation SystemsPart 1: Earth Stations and Spacecraft
Enrico,
My comments are:
1. ESA-MB-01: The addition of proposed text to specify pi/2-BPSK
symbols is inconsistent with the rest of the text that recommends only
QPSK, OQPSK, 8PSK, 16APSK, 32APSK, or 64APSK, modulations. In addition,
since pi/2-BPSK only exist in CCSDS 131.2-B-1 and CCSDS 131.2-B-1 and not
in 401.0-B, it has not been studied formally as a modulation technique
where we would need evaluate the modulation and demodulation complexities.
I would reject this RID.
2. ESA-SM-01: The inclusion of 10Hz-100Hz specification of the
phase noise mask is necessary because there is no lower bound on symbol
rate of the recommendation. Recommends (2) in fact specifies QPSK, OQPSK,
or 8PSK modulations below 10 Ms/s where there could be significant AWGN
noise power. Missions trying to operate with very narrow of loop
bandwidths to mitigate AWGN noise need to know that they could increase
phase noise. I would reject this RID as well.
The rest I agree with.
Regards,
Wai Fong, Ph.D.
Communications Engineer
Flight Microwave and Telecommunications Systems Branch
NASA Goddard Space Flight Center
Code 567
Greenbelt, MD 20771
From: <sls-rfm-bounces at mailman.ccsds.org> on behalf of Enrico Vassallo <
Enrico.Vassallo at esa.int>
Date: Thursday, May 19, 2016 at 9:49 AM
To: "sls-rfm at mailman.ccsds.org" <sls-rfm at mailman.ccsds.org>
Cc: "Marco.Lanucara at esa.int" <Marco.Lanucara at esa.int>, "
Salvador.Marti at esa.int" <Salvador.Marti at esa.int>
Subject: [Sls-rfm] CCSDS Review of CCSDS 401.0-P-25.1, Radio Frequency and
Modulation SystemsPart 1: Earth Stations and Spacecraft
Dear All,
this is to inform you of the outcome of the above review.
CNES, DLR, INPE and JAXA concurred with the pink sheets.
ESA and EUM generated 3 RIDs each. They are attached for your review.
My proposal is:
1) ESA-MB-01
We were initially thinking of adding Pi/2-BPSK symbols definition as an
additional recommendation in 401. However, it makes more sense to have it
inside recommendation 2.4.23 that becomes self standing.
Disposition: ACCEPTED
2) ESA-ML-01
Makes the recommendation ECSS compatible (specifications cannot be in
footnotes).
Disposition: ACCEPTED
3) ESA-SM-01
The phase noise between 10 and 100 Hz is not important for this kind of
missions with at least 10 Ms/s (even for 1 Ms/s that is behind recommends
(2)).
Disposition: ACCEPTED
4) EUM-XE-001
Editorial clarification.
Disposition: ACCEPTED
5) EUM-XE-002
Editorial.
Disposition: ACCEPTED
6) EUM-XE-003
Almost editorial. In the ESA implementation, pilots are used also for
lower order modulations but the suggestion of this RID is reasonable.
Disposition: ACCEPTED
If I do not hear from you by June 10, I will assume that the WG concurs
with my proposed disposition and will send disposed RIDs and final version
of the recommendation to the CCSDS management for approval.
Regards, Enrico
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