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<p class="MsoNormal">Dear SLP WG,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As discussed at our SLP WG meeting in London today.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Greg<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span lang="EN-GB" style="font-size:12.0pt;color:black">From:
</span></b><span lang="EN-GB" style="font-size:12.0pt;color:black">Stefano Petri <Stefano.Petri@esa.int><br>
<b>Date: </b>Tuesday, November 5, 2024 at 6:12</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span lang="EN-GB" style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>Kazz, Greg (US 312B) <greg.j.kazz@jpl.nasa.gov><br>
<b>Subject: </b>[EXTERNAL] updated symbol rate description for prox-1<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB">Dear Greg,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">As discussed, proposal description for the symbol rate field:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Bits 48-63 of the LINK ESTABLISHMENT & CONTROL directive shall indicate the symbol rate in symbols per second. This value is a binary16-bit whose format is specified by the IEEE 754 standard for half-precision floating
point numbers i.e., 1 sign bit (always set positive), 5 bits exponent, and 10 bits mantissa/significand.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To derive the value of this field, the symbol rate in symbols per second shall be divided by 2^16 and then converted to IEEE 754 half-precision floating point.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To derive the symbol rate value from the field value, the opposite operation shall be done, i.e. the floating point value shall be multiplied by 2^16.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The minimum symbol rate allowable is 1,000 symbols/s.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">In S-band, the maximum symbol rate value allowable is 4,096,000 symbols/s.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The sign bit is always transmitted as a positive value and the ‘all ones’ that is, ‘11111’ exponent value is excluded.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">NOTE: Symbol Rate assignment must take into consideration the actual spectrum available.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">NOTE: The default hailing symbol rate is 2,000 sps, which is LDPC (2048,1024) encoded.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">NOTE: Symbol rate values in the range from 1,000 symbol/s to 4,096,000 symbols/s are represented with a precision of 0.1%.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">An additional point, at paragraph B3.2.2.2 I believe there’s a typo, it should read "Type 5" instead of “Type 4”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Stefano<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:8.0pt;color:#747678">ESA - European Space Agency</span></b><span lang="EN-GB" style="font-size:8.0pt;color:gray"><br>
<br>
</span><b><span lang="EN-GB" style="font-size:8.0pt;color:#00A1E0">Stefano Petri</span></b><span lang="EN-GB" style="font-size:8.0pt;color:gray"><br>
TT&C Communications Systems Engineer<br>
<br>
End-to-end System Comms Section (TEC-SET)<br>
End-to-End Systems Division (TEC-SE)<br>
Directorate of Technology, Engineering and Quality (TEC)<br>
<br>
<b>European Space Research and Technology Centre (ESTEC)</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands<br>
<a href="mailto:Stefano.Petri@esa.int"><span style="color:gray">Stefano.Petri@esa.int</span></a> | <a href="https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!PACoEZnlASkMXhGuNhKJeaA-CU7nro61m6kyX1qFTe0J7dsWiudJ4wrSZ-g3TFlVBYpvY-wfSbS0jQ4ZwYZry6w6UyWgs7F3$"><span style="color:gray">www.esa.int</span></a><br>
T +31 6 81 36 67 79</span><span lang="EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
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