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, Hanaa Al‐Bitar · NAVIGATION Journal of the Institute of Navigation · 2020
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.