Joint STO and DFO Estimation for SEFDM in Low-Earth-Orbit Satellite Communications

被引：2

作者：

Liang, Xiaohu ^{[1
,2
]}

Niu, Hehao ^{[3
]}

Liu, Aijun ^{[2
]}

Gao, Zhixiang ^{[2
]}

Zhang, Yunyang ^{[2
]}

机构：

[1] Southeast Univ, Sch Informat Sci & Engn, Nanjing 210000, Peoples R China

[2] Army Engn Univ, Sch Commun Engn, Nanjing 210000, Peoples R China

[3] Natl Univ Def Technol, Inst Elect Countermeasure, Hefei 230037, Peoples R China

来源：

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS | 2022年 / 58卷 / 04期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Maximum likelihood estimation; Low earth orbit satellites; Frequency division multiplexing; OFDM; Indexes; Simulation; Frequency estimation; Doppler frequency offset (DFO); low-earth-orbit (LEO) satellite communications; maximum likelihood (ML) criterion; spectrally efficient frequency division multiplexing (SEFDM); symbol timing offset (STO);

D O I：

10.1109/TAES.2021.3140186

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

In this article, a joint symbol timing offset (STO) and Doppler frequency offset (DFO) estimation algorithm is proposed for spectrally efficient frequency division multiplexing (SEFDM) system in the downlink of low-earth-orbit (LEO) satellite communications. Considering the nonorthogonality of SEFDM, the proposed algorithm is derived by maximizing likelihood function. To reduce computation complexity of STO estimator, all unnecessary terms in likelihood function are ignored. Further, the proposed CFO estimator is simplified by replacing the inverse trigonometric function with polynomial approximation. According to relevant standards issued by the International Telecommunications Union and the 3rd Generation Partnership Project, simulation parameters are set to evaluate the estimation performance. Simulation results show that the proposed algorithm is robust to different packing factors of SEFDM, and outperforms traditional estimation methods.

引用

页码：3725 / 3729

页数：5

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