Re: [Sls-rfm] CCSDS Review of CCSDS 401.0-P-25.1, Radio Frequency and Modulation Systems­Part 1: Earth Stations and Spacecraft

[Enrico.Vassallo at esa.int]

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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