[Sls-slp] FW: updated symbol rate description for prox-1

[Kazz, Greg (US 312B)]

Dear SLP WG,

As discussed at our SLP WG meeting in London today.

Regards,
Greg

From: Stefano Petri <Stefano.Petri at esa.int>
Date: Tuesday, November 5, 2024 at 6:12 AM
To: Kazz, Greg (US 312B) <greg.j.kazz at jpl.nasa.gov>
Subject: [EXTERNAL] updated symbol rate description for prox-1
Dear Greg,
As discussed, proposal description for the symbol rate field:

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.
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.
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.
The minimum symbol rate allowable is 1,000 symbols/s.
In S-band, the maximum symbol rate value allowable is 4,096,000 symbols/s.
The sign bit is always transmitted as a positive value and the ‘all ones’ that is, ‘11111’ exponent value is excluded.

NOTE: Symbol Rate assignment must take into consideration the actual spectrum available.
NOTE: The default hailing symbol rate is 2,000 sps, which is LDPC (2048,1024) encoded.
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%.


An additional point, at paragraph B3.2.2.2 I believe there’s a typo, it should read "Type 5" instead of “Type 4”



Stefano

ESA - European Space Agency

Stefano Petri
TT&C Communications Systems Engineer

End-to-end System Comms Section (TEC-SET)
End-to-End Systems Division (TEC-SE)
Directorate of Technology, Engineering and Quality (TEC)

European Space Research and Technology Centre (ESTEC)
Keplerlaan 1, PO Box 299
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