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.

中文翻译：

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优化消息结构和通道编码的协同设计，以降低第二代伽利略信号的TTD

最近，已经研究了GNSS消息结构和相关的信道编码方案的联合设计，以减少首次定位时间（TTFF），尤其是减少时钟和星历表数据（CED）的时间。 。在此背景下，本文提出了一种共同设计导航消息和信道编码方案结构的新方法。这种新的协同设计使我们能够减少检索CED的时间，同时增强了在恶化的信道条件下的纠错能力。为了满足这些要求，设计了一些结构化编码方案，它们在非遍历信道假设下提供了最大距离可分离（MDS）和全分集特性。