2 1 telemetry system concept

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Unformatted text preview: ............................................................................... 2-1 TELEMETRY SYSTEM CONCEPT..................................................................... 2-3 TM SYNCHRONIZATION AND CHANNEL CODING .......................................... 3-1 3.1 3.2 3.3 3.4 4 PURPOSE............................................................................................................... 1-1 SCOPE .................................................................................................................... 1-1 ORGANIZATION .................................................................................................. 1-1 REFERENCES ....................................................................................................... 1-2 OVERVIEW OF CCSDS TELEMETRY SYSTEM .................................................. 2-1 2.1 2.2 3 Page INTRODUCTION .................................................................................................. 4-1 ENCODER FOR THE (7,1/2) RECOMMENDED CODE .................................... 4-1 ENCODER FOR THE RECOMMENDED PUNCTURED CONVOLUTIONAL CODES ................................................................................ 4-3 SOFT MAXIMUM LIKELIHOOD DECODING OF CONVOLUTIONAL CODES ................................................................................ 4-4 PERFORMANCE OF THE RECOMMENDED (7,1/2) CONVOLUTIONAL CODE .................................................................................. 4-7 PERFORMANCE OF THE RECOMMENDED PUNCTURED CONVOLUTIONAL CODES ................................................................................ 4-9 REED-SOLOMON CODE ............................................................................................ 5-1 5.1 5.2 5.3 5.4 5.5 INTRODUCTION .................................................................................................. 5-1 ENCODER.............................................................................................................. 5-2 INTERLEAVING OF THE REED-SOLOMON SYMBOLS................................ 5-4 HARD ALGEBRAIC DECODING OF REED-SOLOMON CODES................... 5-5 PERFORMANCE OF THE RECOMMENDED REED-SOLOMON CODES ..... 5-6 CCSDS 130.1-G-1 Page v June 2006 TM SYNCHRONIZATION AND CHANNEL CODING —SUMMARY OF CONCEPT AND RATIONALE CONTENTS (continued) Section 6 CONCATENATED CODES: REED-SOLOMON AND CONVOLUTIONAL ...... 6-1 6.1 6.2 6.3 7 INTRODUCTION .................................................................................................. 6-1 ENCODING AND DECODING A CONCATENATED CODE ........................... 6-2 PERFORMANCE OF THE RECOMMENDED CONCATENATED CODING SYSTEMS.............................................................................................. 6-4 TURBO CODES............................................................................................................. 7-1 7.1 7.2 7.3 7.4 8 Page INTRODUCTION .................................................................................................. 7-1 TURBO ENCODER ............................................................................................... 7-2 TURBO DECODER ............................................................................................... 7-4 PERFORMANCE OF THE RECOMMENDED TURBO CODES ....................... 7-7 IMPORTANT ANCILLARY ASPECTS OF THE CODING SYSTEM .................. 8-1 8.1 8.2 8.3 8.4 8.5 8.6 GENERAL.............................................................................................................. 8-1 RANDOMIZATION OF THE CODED OUTPUT ................................................ 8-1 CODEBLOCK SYNCHRONIZATION................................................................. 8-4 CERTIFICATION OF THE DECODED DATA (FRAME INTEGRITY CHECKS) ......................................................................................... 8-7 CODE TRANSPARENCY..................................................................................... 8-9 REMAPPINGS OF THE BITS............................................................................. 8-10 ANNEX A GLOSSARY ................................................................................................... A-1 ANNEX B ACRONYMS AND ABBREVIATIONS .......................................................B-1 ANNEX C RATIONALE FOR TURBO CODE PARAMETER SELECTIONS ....... C-1 Figure 2-1 2-2 3-1 3-2 3-3 Layered Telemetry Service Model ............................................................................... 2-2 Telemetry Data Structures ............................................................................................ 2-5 Coding System Block Diagram: Concatenated Codes ................................................. 3-2 Coding System Block Diagram: Turbo Codes ............................................................. 3-3 Capacity Limits on the BER Performance for Codes with Rates 1/2, 1/3, 1/4 and 1/6 Operating over a Binary Input AWGN Channel ............... 3-4 3-4 Shannon Sphere-Packing Lower Bounds on the WER Performance for Codes with Varying Information Block Length k and Rates 1/6, 1/4, 1/3, 1...
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