Optimizing the co-design of message structure and channel coding to reduce the TTD for a Galileo 2nd generation signal

Lorenzo Ortega, Charly Poulliat, Marie Laure Boucheret, Marion Aubault-Roudier, Hanaa Al-Bitar

Peer Reviewed

Abstract: Recently, the joint design of the GNSS message structure and the associated channel-coding scheme have been investigated as a means to reduce the Time-To-First-Fix (TTFF) and particularly the time to retrieve the Clock and Ephemerides Data (CED). In this context, a new method to co-design the navigation message and the channel-coding scheme structure is proposed in this paper. This new co-design enables us to reduce the time to retrieve the CED while enhancing error-correction capabilities under degraded channel conditions. In order to fulfill such requirements, some structured coding schemes are designed, which provide both maximum distance separable (MDS) and full diversity properties under a non-ergodic channel assumption.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 67, Number 3
Pages: 471 - 492
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https://doi.org/10.1002/navi.382
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