论文标题
使用压缩传感的OTFS调制中的叠加通道估计
Superimposed Channel Estimation in OTFS Modulation Using Compressive Sensing
论文作者
论文摘要
正交时间频率空间（OTFS）技术是一种二维调制方法，可在延迟多普勒（DD）域中多路复用信息符号。 OTFS在高速无线通信中打击现有的高多普勒转移。但是，OTF中的常规频道估计遭受了高驾驶机高架的苦难，因为防护符号占据了DD域网格的很大一部分。在本文中，提出了一个叠加的通道估计，该估计可以完全估算通道参数而无需考虑飞行员开销和性能退化。由于DD域中的通道状态信息（CSI）稀疏，因此使用了稀疏的恢复算法正交匹配追踪（OMP）。此外，我们所提出的方法不会遭受高峰值与平均功率比（PAPR）的困扰。为了检测信息符号，采用了一个消息传递（MP）检测器，该检测器利用了DD通道表示的稀疏性。
Orthogonal time frequency space (OTFS) technique is a two-dimensional modulation method that multiplexes information symbols in the delay-Doppler (DD) domain. OTFS combats high Doppler shift existing in high speed wireless communication. However, conventional channel estimation in OTFS suffers from high pilot overhead because guard symbols occupy a significant part of the DD domain grids. In this paper, a superimposed channel estimation is proposed which can completely estimate channel parameters without considering pilot overhead and performance degradation. As the channel state information (CSI) in the DD domain is sparse, a sparse recovery algorithm orthogonal matching pursuit (OMP) is used. Besides, our proposed method does not suffer from high peak to average power ratio (PAPR). To detect information symbols, a message passing (MP) detector, which exploits the sparsity of DD channel representation, is employed.
