130x1g2 - CCSDS

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TM SYNCHRONIZATION AND CHANNEL CODING—SUMMARY OF CONCEPT AND RATIONALECONTENTS (continued)FigurePage9-7 Logic Diagram of the Encoder.................................................................................... 9-189-8 Logic Diagram of the Decoder ................................................................................... 9-199-9 Turbo-CRC Encoder ................................................................................................... 9-199-10 Block Diagrams for Implementing the (Optional) (a) ‘NRZ-L to NRZ-MConversion’ and (b) Its Inverse .................................................................................. 9-229-11 Realization of symmetric, non-uniform, midrise quantizer, q = 4. Quantizerbounds are normalized to the clipping level A. ............................................................C-29-12 Quantization Law when Using the Quantization Strategy 2, for the Case of q = 4. ....C-29-13 Example of Comparison between Quantization Clipping Threshold 1 andQuantization Clipping Threshold 2, when Applied to CC+RS ConcatenatedCodes with R = 1/2 and R = 7/8 ....................................................................................C-3D-1 Comparison of Turbo Code Performance with Block Length-ConstrainedLower Bound ............................................................................................................... D-2D-2 Performance Comparison for Pseudo-Random and Algorithmic Permutations .......... D-4D-3 Interpretation of Permutation ....................................................................................... D-4Table4-1 Puncturing Patterns for the CCSDS Punctured Convolutional Code Rates ................. 4-46-1 Frame Lengths for All Interleaving Depths .................................................................. 6-3CCSDS 130.1-G-2 Page x November 2012
TM SYNCHRONIZATION AND CHANNEL CODING—SUMMARY OF CONCEPT AND RATIONALE1 DOCUMENT PURPOSE, SCOPE, AND ORGANIZATION1.1 PURPOSEThis report contains the concept and supporting rationale for TM Synchronization andChannel Coding developed by the Consultative Committee for Space Data Systems(CCSDS). It has been prepared to serve two major purposes:a) to provide an introduction and overview for the Channel Coding concept upon whichthe detailed CCSDS TM Synchronization and Channel Coding specifications(reference [3]) are based;b) to describe and explain the codes considered and to supply the supporting rationale.Supporting performance information along with illustrations are also included. This reportprovides a broad tutorial overview of the CCSDS TM Synchronization and Channel Codingand is aimed at helping first-time readers to understand the Recommended Standard. It is notintended to provide all necessary knowledge for successfully designing telemetrycommunication links.In no event will CCSDS or its members be liable for any incidental, consequential, orindirect damages, including any lost profits, lost savings, or loss of data, or for any claim byanother party related to errors or omissions in this report. This document is a CCSDSinformational Report and is therefore not to be taken as a CCSDS Recommended Standard.The actual Recommended Standard is in reference [3].1.2 SCOPEThe concepts, protocols and data formats developed for the TM Synchronization and ChannelCoding described herein are designed for space communications links, primarily betweenspacecraft and ground elements. Data formats are designed with efficiency as a primaryconsideration; i.e., format overhead is minimized. The results reflect the consensus of expertsfrom many space agencies.This document provides supporting and descriptive material only: it is not part of theRecommended Standard. In the event of any conflict between the TM Synchronization andChannel Coding Recommended Standard (reference [3]) and the material presented herein,the Recommended Standard shall prevail.1.3 ORGANIZATIONAn overview of the CCSDS Telemetry System is presented in section 2, which introduces thenotion of architectural layering to achieve transparent and reliable delivery of scientific andengineering sensor data (generated aboard remote space vehicles) to the users located inspace or on Earth.CCSDS 130.1-G-2 Page 1-1 November 2012
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130x1g2 - CCSDS

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