CCSDS – LDPC Decoder Applications

The CCSDS (The Consultative Committee for Space Data Systems) published an “experimental specification” for near-earth and deep space communication in 2007. The document was contributed to CCSDS by NASA (National Aeronautics and Space Administration). In 2011 the LDPC codes were adopted by a blue book as “recommended standard”.

The documents describe ten LDPC codes, one optimized for near-earth communication (block length 8176), and all others optimized for deep space communication. The block lengths of the deep space codes were selected such that three lengths of information words exist (1024, 4096, and 16384).

Standard	Low Density Parity Check Codes for Use in Near-Earth and Deep Space Applications, Orange Book, Issue 2, Experimental Specification.
	TM Synchronization and Channel Coding, Blue Book, Issue 2, Recommended Standard.
Organization	CCSDS (The Consultative Committee for Space Data Systems)
Publication	2007 (Orange Book) 2011 (Blue Book)
Documents	CCSDS 131.1-O-2 CCSDS 131.0-B-2
Applications	Near-Earth and deep space communication
IP Core	CCSDS LDPC Encoder and Decoder
LDPC Codes	10
	Block Length	Information Word	Submatrix Size	Code Rates
	8176	7154	511	7/8
	1280	1024	128	4/5
	1536	1024	256	2/3
	2048	1024	512	1/2
	5120	4096	512	4/5
	6144	4096	1024	2/3
	8192	4096	2048	1/2
	20480	16384	2048	4/5
	24576	16384	4096	2/3
	32768	16384	8192	1/2