• International Telemetering Conference Proceedings, Volume 60 (2025)

  International Foundation for Telemetering, 2025-10
• LEVERAGING PILOT SEQUENCE ORTHOGONALITY FOR LOW COMPLEXITY SPACE-TIME CODING RECEIVERS

  Ait Sidi Ali, Oussama; Thomas, Alain; Le Gal, Bertrand; Tajan, Romain; SAFRAN DATA SYSTEMS; IRISA Laboratory; IMS Laboratory (International Foundation for Telemetering, 2025-10)

  This paper explores CPM waveforms used for telemetry purposes, with a specific focus on SOQPSK TG standard and its integration with Space-Time Coding to address the two-antenna problem. Cur rent state-of-the-art receiver algorithms face challenges, including delays, error propagation, and poor performance at low SNR levels. To address these issues, this paper introduces a novel re ceiver design leveraging improved correlation properties of new pilot sequences. The proposed design performs CSI estimation at the pilot detection stage, thus eliminating iterative processes, mitigating long synchronization times, and enhancing receiver performance at lower SNR levels.
• Telemetry Spectrum Encroachment Review of Related WRC-27 Agenda and Domestic Threats

  Chalfant, Tim; Williams, Guy; International Consortium for Telemetry Spectrum (International Foundation for Telemetering, 2025-10)

  A review of international and domestic spectrum issues that present challenges for the future use of radio frequency telemetry after the 2023 World Radiocommunications Conference (WRC-23). Several agenda items addressed there have a potential for telemetry spectrum encroachment and are presented in this paper. Agenda topics of telemetry interest in future World Radiocommunications Conferences (WRCs), in particular several agenda items that will be considered at the 2027 World Radiocommunications Conference (WRC-27), are a particular focus. International telemetry vendors, suppliers, and users need to be aware of, and potentially engage with, their national administrations on these items to protect and preserve spectrum for the future of aeronautical mobile telemetry.
• ELIMINATING UNDETECTED ERRORS IN LDPC–CPM DECODERS

  Perrins, Erik; Department of Electrical Engineering and Computer Science, The University of Kansas (International Foundation for Telemetering, 2025-10)

  In error control coding, an undetected error occurs when the received code word passes the parity check even though errors are present. Such errors are a critical concern in many applications because a passed parity check at the receiver is taken to mean that the received code word is error free. In this paper, we outline the key operating principles and differences between the two constituent decoders in the system. Our high-level discussion reveals insights on two strategies that can be used in an LDPC–CPM decoder to eliminate undetected errors. The first is a brute-force approach of performing an additional decoding iteration to confirm (or rebut) a passed parity check. The second is a simple and elegant check-node-splitting approach that can be incorporated into the LDPC code itself. We provide numerical results and operating scenarios where these techniques are recommended for use.
• DENSITY EVOLUTION ANALYSIS OF PUNCTURED IRIG-106 LDPC CODES: TOWARD CONTESTED SPECTRUM RESILIENCY

  Perrins, Erik; Cummins, D. Andrew; Mitchell, David G. M.; Department of Electrical Engineering and Computer Science, The University of Kansas (International Foundation for Telemetering, 2025-10)

  Recently, random puncturing was shown to be a promising solution to reduce the coding over head and improve the spectral efficiency of low-density parity-check (LDPC) codes designed for the continuous phase modulation (CPM) waveforms of the Advanced-Range TeleMetry (ARTM) program. In this paper, we perform an asymptotic iterative decoding analysis of punctured ARTM LDPC codes. We determine iterative decoding thresholds for this family of codes for structured and unstructured puncturing patterns. Prudent selection of puncturing patterns will allow us to create spectrally efficient codes of various rates across the target operational regime. We show that it is possible to identify puncturing patterns in the underlying code protographs that result in catastrophic iterative decoding failure, thereby informing the combinatorial search for robust puncturing schemes that preserve performance while enabling tactical rate adaptation.

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