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Non-coherent rate-splitting for multibeam satellite forward link: practical coding and decoding algorithms

机译：多波束卫星前向链路的非相干速率分离：实用的编码和解码算法

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Non-Coherent Rate-Splitting (NCRS) was recently proposed as a practical multiuser coding and decoding scheme to increase the spectral efficiency of multibeam satellite communication systems. In this paper, we further study the practical realization of NCRS. We propose a modified coding scheme (${mathrm {NCRS}}^{*}$) that is robust to a nonzero time offset among beams. In NCRS*, as opposed to NCRS, the beams send independently channel encoded and modulated waveforms.We assess the performance of NCRS* in terms of the achievable rate region. It is shown that NCRS* performs worse than NCRS, but better than or comparable to other competing schemes, which, as opposed to NCRS*, require flexible bandwidth allocation or perfect synchronization at the transmitter. We also propose a new N-MAP algorithm for the practical implementation of NCRS* receivers. Similar to the existing UMAP algorithm, N-MAP takes into account the modulation used by, and the time offset between, the signals received from the different beams. In most cases, however, N-MAP has a significantly lower complexity than U-MAP.
机译：非相干速率分离（NCRS）最近被提出作为一种实用的多用户编码和解码方案，以提高多波束卫星通信系统的频谱效率。在本文中，我们将进一步研究NCRS的实际实现。我们提出了一种改进的编码方案（$ {\ mathrm {NCRS}} ^ {*} $），它对波束之间的非零时间偏移具有鲁棒性。与NCRS相反，在NCRS *中，光束独立发送通道编码和调制的波形。我们根据可达到的速率区域来评估NCRS *的性能。结果表明，NCRS *的性能比NCRS差，但比其他竞争方案好或与之相当，与NCRS *相比，它要求在发射机上灵活地分配带宽或实现完美的同步。我们还为NCRS *接收机的实际实现提出了一种新的N-MAP算法。类似于现有的UMAP算法，N-MAP考虑了从不同波束接收到的信号所使用的调制以及它们之间的时间偏移。但是，在大多数情况下，N-MAP的复杂度明显低于U-MAP。

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