文献类型：期刊文献

英文题名：Matrix Pencil-Based Channel Estimation Algorithm for OTFS in Fractional Doppler Channels

作者：Liang, Yuanyi[1];Yuan, Weina[1];Wu, Yue[1];Fan, Pingzhi[2]

机构：[1]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China;[2]Southwest Jiaotong Univ, CSNMT Int Cooperat Res Ctr MoST, Informat Coding & Transmiss Key Lab Sichuan Prov, Chengdu 611756, Peoples R China

年份：2024

卷号：28

期号：9

起止页码：2191

外文期刊名：IEEE COMMUNICATIONS LETTERS

收录：;EI(收录号：20242816673005);WOS:【SCI-EXPANDED(收录号:WOS:001314323800035)】；

基金：The work of Pingzhi Fan was supported by NSFC project No.62020106001. The associate editor coordinating the review of this letterand approving it for publication was M. C. Aguayo-Torres.

语种：英文

外文关键词：Channel estimation; Doppler shift; Delays; Estimation; Symbols; Noise; Indexes; OTFS; matrix pencil (MP); channel estimation; fractional Doppler

摘要：Orthogonal Time Frequency Space (OTFS) modulation is a promising modulation technology, which can meet the communication requirements of future high-speed mobile scenarios. In OTFS modulation, obtaining channel state information (CSI) is crucial for data detection. We show that the delay-doppler (DD) domain channel estimation problem can be transformed into an exponential sinusoid signal parameter estimation problem in delay-time (DT) domain using Inverse Discrete Fourier Transform (IDFT). Hence, we propose a Matrix Pencil (MP)-based channel estimation algorithm to achieve fractional Doppler channel estimation. This algorithm can accurately decompose coherent Doppler shifts without the need of Doppler search space in presence of inter-Doppler interference (IDI), and thus has lower computational complexity. Our simulation results verify that the normalized mean square error (NMSE) and bit error rate (BER) of the proposed algorithm can outperform the baseline algorithms.