低轨卫星通信中SCMA系统载波同步算法设计

doi:10.12305/j.issn.1001-506X.2021.05.24

Abstract

Abstract:

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.

Key words: Doppler frequency shift, carrier synchronization, sparse code multiple access (SCMA), satellite communication

CLC Number:

TN911.23

Jiayi ZHANG, Zhongyang YU, Min ZHU, Baoming BAI, Wei LIU, Qilong RONG. Design of carrier synchronization algorithm for SCMA system in LEO satellite communication[J]. Systems Engineering and Electronics, 2021, 43(5): 1354-1360.

Figures/Tables 9

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References 28

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资源	频偏	相偏
资源块1	Δf₁T_s=0.40	${\theta _1} = \frac{\pi }{3}$
资源块2	Δf₂T_s=0.30	${\theta _2} = \frac{\pi }{2}$
资源块3	Δf₃T_s=0.35	${\theta _3} = - \frac{\pi }{3}$
资源块4	Δf₄T_s=0.35	${\theta _4} = \frac{\pi }{4}$

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

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