论文标题
基于位置的压缩通道估计和高迁移率系统的试验设计
Position Based Compressed Channel Estimation and Pilot Design for High Mobility OFDM Systems
论文作者
论文摘要
随着许多国家 /地区的高速列车（HST）的发展，在HST中提供宽带无线服务变得至关重要。正交频划分多路复用（OFDM）由于其高光谱效率而被广泛用于宽带无线通信。但是，OFDM对高移动性通道引起的时间选择性敏感，该通道花费了大量的频谱或时间资源来获得准确的通道状态信息（CSI）。因此，DM系统高速公路中的渠道估计是一个长期的挑战。在本文中，我们首先提出了一个新的基于位置的高运动通道模型，其中利用HST的位置信息和多普勒偏移来确定主要通道系数的位置。 ％以这种方式，我们可以降低估计复杂性并设计传输的飞行员。它旨在降低试点信号与提出的通道模型之间的相干性，从而可以提高通道估计精度。仿真结果表明，所提出的方法比在高运动通道上实现了比现有的通道估计方法更好的性能。此外，我们举例说明了设计的飞行员代码手册，以显示拟议方案的实际适用性。
With the development of high speed trains (HST) in many countries, providing broadband wireless services in HSTs is becoming crucial. Orthogonal frequency-division multiplexing (OFDM) has been widely adopted for broadband wireless communications due to its high spectral efficiency. However, OFDM is sensitive to the time selectivity caused by high-mobility channels, which costs large spectrum or time resources to obtain the accurate channel state information (CSI). Therefore, the channel estimation in high-mobility OFDM systems has been a long-standing challenge. In this paper, we first propose a new position-based high-mobility channel model,in which the HST's position information and Doppler shift are utilized to determine the positions of the dominant channel coefficients. %In this way, we can reduce the estimation complexity and to design the transmitted pilot.Then, we propose a joint pilot placement and pilot symbol design algorithm for compressed channel estimation. It aims to reduce the coherence between the pilot signal and the proposed channel model, and hence can improve the channel estimation accuracy. Simulation results demonstrate that the proposed method achieves better performances than existing channel estimation methods over high-mobility channels. Furthermore, we give an example of the designed pilot codebook to show the practical applicability of the proposed scheme.
