Design of carrier synchronization algorithm for SCMA system in LEO satellite communication

被引：0
作者：
Zhang J. [1 ]
Yu Z. [1 ]
Zhu M. [1 ]
Bai B. [1 ]
Liu W. [2 ]
Rong Q. [2 ]
机构：
[1] State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an
[2] The 7th Research Institute of China Electronics Technology Group Corporation, Guangzhou
来源：
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | 2021年 / 43卷 / 05期
关键词：
Carrier synchronization; Doppler frequency shift; Satellite communication; Sparse code multiple access (SCMA);
D O I：
10.12305/j.issn.1001-506X.2021.05.24
中图分类号：
学科分类号：
摘要：
To improve the spectral efficiency of low earth orbit (LEO) satellite communications and combat existing large Doppler frequency shifts, a sparse code multiple access (SCMA) technique is considered for LEO satellite communications, and a data-aided carrier synchronization scheme is proposed for the SCMA system. In this scheme, a stepwise correlation algorithm and a maximum-likelihood algorithm are used to estimate frequency offset and phase offset, respectively. Then, the distribution pattern of the pilot and data symbols is optimized according to the characteristic of the proposed stepwise correlation algorithm. Simulation results show that, taking an SCMA system with 6 users sharing 4 resources as an example, the proposed carrier synchronization scheme using the two optimized frame structures with less pilot overhead can achieve higher estimation accuracy and better error performance than that using the classical frame structure. © 2021, Editorial Office of Systems Engineering and Electronics. All right reserved.
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页码：1354 / 1360
页数：6
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