ccsds 131.0-b-2

CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING1 0 0 0 1 1 0 1and[z 0 , . . ., z 7 ] = [u 7 , . . ., u 0 ][u 7 , . . ., u 0 ] = [z 0 , . . ., z 7 ]1 1 1 0 1 1 1 11 1 1 0 1 1 0 01 0 0 0 0 1 1 01 1 1 1 1 0 1 01 0 0 1 1 0 0 11 0 1 0 1 1 1 10 1 1 1 1 0 1 11 1 0 0 0 1 0 10 1 0 0 0 0 1 00 0 1 0 1 1 1 01 1 1 1 1 1 0 11 1 1 1 0 0 0 00 1 1 1 1 0 0 11 0 1 0 1 1 0 01 1 0 0 1 1 0 0NOTES1 Discussion of dual basis representation is contained in 4.4.2.2 Further information relating the dual basis (Berlekamp) and conventionalrepresentations is given in annex F. Also included is a recommended scheme forpermitting the symbols generated in a conventional encoder to be transformed to meetthe symbol representation required by this document.4.3.10 CODEBLOCK SYNCHRONIZATIONCodeblock synchronization of the Reed-Solomon decoder shall be achieved by synchronizationof the Attached Sync Marker associated with each codeblock. (See section 8.)NOTE – At the receiving end, the ambiguity between true and complemented data must beresolved so that only true data is provided to the Reed-Solomon decoder. Data inNRZ-L form is normally resolved using the 32-bit Attached Sync Marker, whileNRZ-M data is self-resolving.4.4 DISCUSSION4.4.1 SYMBOL INTERLEAVINGSymbol interleaving is accomplished in a manner functionally described with the aid offigure 4-2. (It should be noted that this functional description does not necessarilycorrespond to the physical implementation of an encoder.)CCSDS 131.0-B-2 Page 4-6 August 2011