Conference Proceedingshttp://hdl.handle.net/10150/5955602026-04-13T18:57:20Z2026-04-13T18:57:20ZInternational Telemetering Conference Proceedings, Volume 60 (2025)http://hdl.handle.net/10150/6796012026-02-12T01:11:07Z2025-10-01T00:00:00ZInternational Telemetering Conference Proceedings, Volume 60 (2025)
2025-10-01T00:00:00ZLEVERAGING PILOT SEQUENCE ORTHOGONALITY FOR LOW COMPLEXITY SPACE-TIME CODING RECEIVERSAit Sidi Ali, OussamaThomas, AlainLe Gal, BertrandTajan, Romainhttp://hdl.handle.net/10150/6796002026-02-12T01:10:38Z2025-10-01T00:00:00ZLEVERAGING PILOT SEQUENCE ORTHOGONALITY FOR LOW COMPLEXITY SPACE-TIME CODING RECEIVERS
Ait Sidi Ali, Oussama; Thomas, Alain; Le Gal, Bertrand; Tajan, Romain
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.
2025-10-01T00:00:00ZTelemetry Spectrum Encroachment Review of Related WRC-27 Agenda and Domestic ThreatsChalfant, TimWilliams, Guyhttp://hdl.handle.net/10150/6795992026-02-12T01:10:31Z2025-10-01T00:00:00ZTelemetry Spectrum Encroachment Review of Related WRC-27 Agenda and Domestic Threats
Chalfant, Tim; Williams, Guy
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.
2025-10-01T00:00:00ZELIMINATING UNDETECTED ERRORS IN LDPC–CPM DECODERSPerrins, Erikhttp://hdl.handle.net/10150/6795982026-02-12T01:10:25Z2025-10-01T00:00:00ZELIMINATING UNDETECTED ERRORS IN LDPC–CPM DECODERS
Perrins, Erik
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.
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