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arXiv 1404.0971cs.ITmath.IT
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用于卫星通信的随机接入方法中干扰消除的改进信道估计

Improved channel estimation for interference cancellation in random access methods for satellite communications

Karine Zidane, Jérôme Lacan, Marie-Laure Boucheret, Charly Poulliat

摘要:

在卫星通信的背景下,随机接入(RA)方法可以显著增加吞吐量并减少网络上的延迟。最近的RA方法是基于多用户多址传输在同一时间和频率相结合的干扰消除和迭代解码在接收机。通常,假设在接收器处可获得干扰的完全知识。在实践中,干扰项必须被准确地估计以避免性能下降。在叠加信号的情况下,最近已经提出了几种估计技术。在本文中,我们提出了一种改进的信道估计技术,结合估计使用的自相关方法和期望最大化算法,并使用导频符号辅助调制,以进一步提高性能,实现最佳的干扰消除。

英文摘要:

In the context of satellite communications, random access (RA) methods can significantly increase throughput and reduce latency over the network. The recent RA methods are based on multi-user multiple access transmission at the same time and frequency combined with interference cancellation and iterative decoding at the receiver. Generally, it is assumed that perfect knowledge of the interference is available at the receiver. In practice, the interference term has to be accurately estimated to avoid performance degradation. Several estimation techniques have been proposed lately in the case of superimposed signals. In this paper, we present an improved channel estimation technique that combines estimation using an autocorrelation based method and the Expectation-Maximization algorithm, and uses Pilot Symbol Assisted Modulation to further improve the performance and achieve optimal interference cancellation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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