A Soft-Output STBC Decoder for Aeronautical Telemetry

Authors

  • Yves Louet IETR/CentraleSupelec, France
  • Rami Othman IETR/CentraleSupelec, France
  • Alexandre Skrzypczak Zodiac Data Systems, Colombelles, France

DOI:

https://doi.org/10.26636/jtit.2020.138319

Keywords:

continuous phase modulation (CPM), pulse amplitude modulation (PAM), shaped offset quadrature phase shift keying (SOQPSK), space time block coding (STBC), ternary symbol

Abstract

Alamouti encoding is a well-known space time block encoding technique used to improve the received signal quality in Rayleigh fading channels. In aeronautical telemetry, this encoding technique is applied to shaped offset quadrature phase shift keying tier generation (SOQPSK-TG) modulation in order to handle the two-antenna issue. It is provided for in telemetry-related IRIG standards. In this paper, we propose a unique decoding architecture for Alamouti-encoded SOQPSK-TG signals, taking advantage of pulse amplitude modulation decomposition with soft and hard outputs. We exploit this result to obtain a Viterbi algorithm (VA) for hard decoding and a soft output Viterbi algorithm (SOVA) for soft and hard decoding, with a twofold benefit: operation using one trellis structure, unlike decoders that are based on the 8-waveforms cross-correlated trellis-coded quadrature modulation (XTCQM) approximation, and very attractive bit error rate performance, as well as a complexity trade-off.

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Submitted

2023-05-17

Published

2020-03-30

Issue

No. 1 (2020)

Section

ARTICLES FROM THIS ISSUE

License

Copyright (c) 2020 Journal of Telecommunications and Information Technology

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

[1]
Y. Louet, R. Othman, and A. Skrzypczak, “A Soft-Output STBC Decoder for Aeronautical Telemetry”, JTIT, vol. 79, no. 1, pp. 13–20, Mar. 2020, doi: 10.26636/jtit.2020.138319.