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<title>NGU direction</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I welcome the discussion within NGU on Ed’s ideas below.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Greg<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Greenberg, Edward
(313B) <br>
<b>Sent:</b> Monday, September 27, 2010 4:06 PM<br>
<b>To:</b> 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<br>
<b>Subject:</b> NGU direction<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><br>
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:<br>
<br>
A. If we want to get better uplink coding gain the onboard transponder needs to
be upgraded to accomplish the following:</span><o:p></o:p></p>
<ol start=1 type=1>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The
receiver must provide soft symbols to the code decoder </span><o:p></o:p></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The
receiver design should require less power in the carrier to allow more
powe<span style='color:#1F497D'>r</span> in the data. </span><o:p></o:p></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The
receiver should provide a mechanism to perform time correlation in the
ranging syatem </span><o:p></o:p></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The
transceiver should be capable of providing ranging in the TLM channel when
the ranging rate is lower than the data rate</span><o:p></o:p></li>
<ul type=circle>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level2 lfo1'><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif"'>This will effect the TLM rate because of
interference but we should determine its accepability</span><o:p></o:p></li>
</ul>
</ol>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>B.
The requirement for short command with low receiver latency for emergency
commanding in tumbling events has significantly decreased or vanished.</span><o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l1 level1 lfo2'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Near
earth missions have lots of power to support high rates even to omni
antennas </span><o:p></o:p></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l1 level1 lfo2'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>deep
space missions require safe modes for responding to anomalies with reduced
but constant communication connections</span><o:p></o:p></li>
</ul>
</blockquote>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>C.
Better codes like the 1024 rate 1/2 LDPC code can provide 8db performance
improvement.</span><o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l2 level1 lfo3'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>This
can be accomplished using a TC lite protocol eliminating the BCH code or
using AOS with frames locked to codeblocks.</span><o:p></o:p></li>
</ul>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><br>
<br>
So maybe the NGU WG should be expanded to include <span style='color:#1F497D'>Radio</span>
person<span style='color:#1F497D'>n</span>el (including the Software defined
radio), R.F. Modulation and link and coding protocol personnel. </span>
<o:p></o:p></p>
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