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arXiv 2104.01023eess.SP
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双选择性信道下MIMO空时编码OTFS的信道估计

Channel Estimation for MIMO Space Time Coded OTFS under Doubly Selective Channels

Roberto Bomfin, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

摘要:

针对双色散信道下的多输入多输出(MIMO)系统,提出了一种基于唯一字(UW)的信道估计方法,并将其应用于空时编码(STC)的正交时频域(OTFS)系统。OTFS调制由于其在时间和频率上扩展数据符号的特性,最近已经被提出作为时变信道下的鲁棒技术。另一个相关方面是在发射机和接收机处采用多个天线。因此,我们考虑了STC MIMO系统的循环延迟分集在发送端和最大比合并在接收端,我们开发了一个基于UWB的信道估计方案的多个发射天线。我们表明,最近提出的SISO帧优化方案是直接适用于MIMO。此外,我们数值评估的帧错误率(FER)的OTFS和OFDM与2x2和4x 4 MIMO,其中时变信道估计使用基于UW的方法。仿真结果表明,对于高阶调制和更高码率的MIMO-STC系统,OTFS比OFDM具有更大的优势。

英文摘要:

In this paper, we present a unique word (UW)-based channel estimation approach for multiple-input multiple-output (MIMO) systems under doubly dispersive channels, which is applied to orthogonal time frequency space (OTFS) with space time coding (STC). The OTFS modulation has been recently proposed as a robust technique under time varying channels due to its property of spreading the data symbols over time and frequency. Yet another relevant aspect is the employment of multiple antennas at the transmitter and receiver. Therefore, we consider an STC MIMO system with cyclic delay diversity at the transmitter and maximum ratio combining at the receiver, where we develop a UW-based channel estimation scheme for multiple transmit antennas. We show a recently proposed frame optimization scheme for SISO is directly applicable to MIMO. In addition, we evaluate numerically the frame error rate (FER) of OTFS and OFDM with 2x2 and 4x4 MIMO, where the time varying channel is estimated using the UW-based approach. The FER results reveal that OTFS becomes more advantageous than OFDM for MIMO-STC systems with higher order modulation and code rate.

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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