[Sls-ngu] FW: NGU direction

[Enrico.Vassallo at esa.int]

Fine with me. Bring it to the joint RFM/NGU/C&S meeting with a proper 
input paper.

We shall also make sure that as of the Spring meeting NGU, C&S and RFM do 
not take place at the same time unless joint.

Regards, Enrico



From:
"Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov>
To:
"sls-hru at mailman.ccsds.org" <sls-hru at mailman.ccsds.org>, 
"sls-ngu at mailman.ccsds.org" <sls-ngu at mailman.ccsds.org>
Date:
28/09/2010 14:34
Subject:
[Sls-ngu] FW: NGU direction
Sent by:
sls-ngu-bounces at mailman.ccsds.org



All,
 
I welcome the discussion within NGU on Ed?s ideas below.
 
Ed is pointing out that a lot of the functionality that NGU would require 
to advance the state of the art of the current TC standard is within the 
scope of functionality of the on-board radio. Another aspect he did not 
touch upon is link layer security ? this function could also be done 
within the radio.
 
Thanks,
 
Greg
 
From: Greenberg, Edward (313B) 
Sent: Monday, September 27, 2010 4:06 PM
To: Lee Pitts; Victor Sank; Shames, Peter M (313B); SDLS WG; Howie Weiss; 
Johnson, Charles E (4400-Affiliate); Kazz, Greg J (313B); David Israel; 
Moe Kluksdahl; Lindolfo Martinez; Gain Paolo Calzolari; Takahiro Yamada; 
Edwards, Charles D (6000); Pollara, Fabrizio (3320); Hamkins, Jon (332B); 
Andrews, Kenneth S (332B); Hooke, Adrian J (9000); Lee, Dennis K (332C); 
Gilles Moury; Guy Lesthievent
Subject: NGU direction
 

I have been searching for a way to achieve a new a effective uplink and 
keep running into stone walls.  The following is what I understand:

A. If we want to get better uplink coding gain the onboard transponder 
needs to be upgraded to accomplish the following:
1.      The receiver must provide soft symbols to the code decoder 
2.      The receiver design should require less power in the carrier to 
allow more power in the data. 
3.      The receiver should provide a mechanism to perform time 
correlation in the ranging syatem 
4.      The transceiver should be capable of providing ranging in the TLM 
channel when the ranging rate is lower than the data rate
This will effect the TLM rate because of interference but we should 
determine its accepability
B.  The requirement for short command with low receiver latency for 
emergency commanding in tumbling events has significantly decreased or 
vanished.
Near earth missions have lots of power to support high rates even to omni 
antennas 
deep space missions require safe modes for responding to anomalies with 
reduced but constant communication connections
C.  Better codes like the 1024 rate 1/2 LDPC code can provide 8db 
performance improvement.
This can be accomplished using a TC lite protocol eliminating the BCH code 
or using AOS with frames locked to codeblocks.


So maybe the NGU WG should be expanded to include Radio personnel 
(including the Software defined radio), R.F. Modulation and link and 
coding protocol personnel.    
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