ccsds 131.0-b-2

More documents

Recommendations

Info

CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING10.5.2 If high-speed efficiency is needed for ‘32-bit compatibility’ (with 32-bit processors,for example), then the length of the codeblock shall be a combined multiple of 4 and theinterleaving depth.10.5.3 When only octet compatibility is required, lengths for Transfer Frames (L in octets)shall be determined using the following equation:such that L is a positive integer,L = (255-2E-q) IwhereE = error correction capability,q = number of virtual fill symbols per R-S codeword, andI = interleaving depth.10.5.4 When 32-bit compatibility is required, the Transfer Frame length must be chosen sothata) it is expressed by the equation in 10.5.3; andb) the codeblock length (255-q)I (in octets) is a multiple of 4.10.6 CASE 4: CONCATENATEDThe allowable lengths of Transfer Frames when the concatenated (Reed-Solomon andconvolutional) coding is used are the same as those for the Reed-Solomon–only case (Case3) shown in 10.5.10.7 CASE 5: TURBO10.7.1 The Transfer Frame lengths shall be selected to match the information block lengthsfor the selected Turbo code.NOTE – The Turbo Codes specified in section 5 of this Recommended Standard are blockcodes.10.7.2 Only the following information block lengths shall be used (values are in octets):a) 223;b) 446;c) 892;d) 1115.CCSDS <strong>131.0</strong>-B-2 Page 10-2 August 2011
CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODINGNOTE – Performance for only the above block lengths (i.e., Transfer Frame lengths) hasbeen validated by CCSDS and approved for use (values are in octets).10.8 CASE 6: LDPC10.8.1 The Transfer Frame lengths must match the information block lengths for the selectedLDPC code.NOTE – The LDPC Codes specified in section 7 of this Recommended Standard are blockcodes.10.8.2 When the rate-7/8 LDPC code is used, the only allowable Transfer Frame length is892 octets.10.8.3 When the 1/2-, 2/3-, and 4/5-rate LDPC codes are used, the allowable Transfer Framelengths are 128 octets, 512 octets, or 2048 octets.CCSDS <strong>131.0</strong>-B-2 Page 10-3 August 2011
Page 1 and 2:
Recommendation for Space Data Syste
Page 3 and 4:
CCSDS RECOMMENDED STANDARD FOR TM S
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14: CCSDS RECOMMENDED STANDARD FOR TM S
Page 63: CCSDS RECOMMENDED STANDARD FOR TM S
show all

ccsds 131.0-b-2

Create successful ePaper yourself

Delete template?

Save as template?