Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence
According to the Consultative Committee for Space Data Systems (CCSDS) recommendation for Telecommand (TC) synchronization and coding, the Communications Link Transmission Unit (CLTU) consists of a start sequence, followed by coded data, and a tail sequence, which might be optional depending on the...
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2025-01-01
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| author | Rebecca Giuliani Massimo Battaglioni Marco Baldi Franco Chiaraluce Nicola Maturo |
| author_facet | Rebecca Giuliani Massimo Battaglioni Marco Baldi Franco Chiaraluce Nicola Maturo |
| author_sort | Rebecca Giuliani |
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| description | According to the Consultative Committee for Space Data Systems (CCSDS) recommendation for Telecommand (TC) synchronization and coding, the Communications Link Transmission Unit (CLTU) consists of a start sequence, followed by coded data, and a tail sequence, which might be optional depending on the employed coding scheme. With regard to the latter, these transmissions traditionally use a modified Bose-Chaudhuri–Hocquenghem (BCH) code, to which two state-of-the-art Low-Density Parity-Check (LDPC) codes were later added. A low-complexity approach classically used to detect CLTU termination is to choose a non-correctable string as the tail sequence, and then exploit the decoder failure on that sequence as termination detection. This works very well with the BCH code, for which bounded-distance decoders are employed. Instead, when the same approach is employed with LDPC codes and probabilistic belief propagation iterative decoders, the scenario becomes more challenging. In this paper, we study CCSDS-compliant space communications in which LDPC codes are employed, and analyze the TC rejection probability both theoretically and through intensive numerical simulations. Such a performance figure, being the rate at which CLTUs are discarded, should clearly be minimized. Our numerical analysis considers many different choices of the system parameters (e.g., length of the CLTU, decoding algorithm, maximum number of decoding iterations). Particular attention is devoted to the probability of not-acknowledged termination, i.e., the probability that the tail sequence is not recognized. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-7a6b7f9d362546ca978e6f904425b2be2025-01-25T00:00:34ZengIEEEIEEE Access2169-35362025-01-01138924894010.1109/ACCESS.2025.352705710833618Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail SequenceRebecca Giuliani0https://orcid.org/0009-0007-7981-4718Massimo Battaglioni1https://orcid.org/0000-0002-8539-4007Marco Baldi2https://orcid.org/0000-0002-8754-5526Franco Chiaraluce3https://orcid.org/0000-0001-6994-1448Nicola Maturo4https://orcid.org/0000-0003-4371-6028Department of Information Engineering, Università Politecnica delle Marche, Ancona, ItalyDepartment of Information Engineering, Università Politecnica delle Marche, Ancona, ItalyDepartment of Information Engineering, Università Politecnica delle Marche, Ancona, ItalyDepartment of Information Engineering, Università Politecnica delle Marche, Ancona, ItalyEuropean Space Agency, ESTEC, Noordwijk, The NetherlandsAccording to the Consultative Committee for Space Data Systems (CCSDS) recommendation for Telecommand (TC) synchronization and coding, the Communications Link Transmission Unit (CLTU) consists of a start sequence, followed by coded data, and a tail sequence, which might be optional depending on the employed coding scheme. With regard to the latter, these transmissions traditionally use a modified Bose-Chaudhuri–Hocquenghem (BCH) code, to which two state-of-the-art Low-Density Parity-Check (LDPC) codes were later added. A low-complexity approach classically used to detect CLTU termination is to choose a non-correctable string as the tail sequence, and then exploit the decoder failure on that sequence as termination detection. This works very well with the BCH code, for which bounded-distance decoders are employed. Instead, when the same approach is employed with LDPC codes and probabilistic belief propagation iterative decoders, the scenario becomes more challenging. In this paper, we study CCSDS-compliant space communications in which LDPC codes are employed, and analyze the TC rejection probability both theoretically and through intensive numerical simulations. Such a performance figure, being the rate at which CLTUs are discarded, should clearly be minimized. Our numerical analysis considers many different choices of the system parameters (e.g., length of the CLTU, decoding algorithm, maximum number of decoding iterations). Particular attention is devoted to the probability of not-acknowledged termination, i.e., the probability that the tail sequence is not recognized.https://ieeexplore.ieee.org/document/10833618/LDPC codessatellite communicationstail sequenceTelecommand |
| spellingShingle | Rebecca Giuliani Massimo Battaglioni Marco Baldi Franco Chiaraluce Nicola Maturo Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence IEEE Access LDPC codes satellite communications tail sequence Telecommand |
| title | Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence |
| title_full | Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence |
| title_fullStr | Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence |
| title_full_unstemmed | Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence |
| title_short | Telecommand Rejection Probability in CCSDS-Compliant LDPC-Coded Space Transmissions With Tail Sequence |
| title_sort | telecommand rejection probability in ccsds compliant ldpc coded space transmissions with tail sequence |
| topic | LDPC codes satellite communications tail sequence Telecommand |
| url | https://ieeexplore.ieee.org/document/10833618/ |
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