基于多速率星地环路的SC-CFDMA上行符号同步方法

doi:10.11959/j.issn.1000-436x.2015298

Abstract

Abstract:

SC-CFDMA(single carrier code and frequency division multiple access) system,whose synchronization is more difficult than that of common orthogonal multi-carrier systems,requires the symbol synchronization to achieve a chip-level precision.Therefore,a synchronization method based on multi-rate satellite-ground loop is proposed.This method extends the closed-loop control on the non-sampling points of the loop through raising the control rates of some loop components,so as to promote the adaptability to users with different speeds.Besides,the state-space equations of the loop and related components are derived.The Matlab simulation results show that,even in GEO satellite system,the synchronization method proposed can adjust the SC-CFDMA uplink symbol timing errors between several supersonic users within chip-level duration,thus providing stable communication.

Key words: satellite communication, SC-FDMA, symbol synchronization, multi-rate, closed-loop control

Dan DING,Nai-ping CHENG,Yu-rong LIAO. SC-CFDMA uplink symbol synchronization method based on multi-rate satellite-ground loop[J]. Journal on Communications, 2015, 36(Z1): 181-187.

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References 15

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类别	参数	取值
系统基本参数	总子载波数N	1 024
	子载波集大小M	64
	训练序列类型	Gold码
	卫星类型	GEO透明转发卫星
系统误差来源	卫星摄动影响	1 m/s
	本地钟源漂移影响	1 ns/s
	电离层闪烁影响	10 ns/s
	A/D采样处信噪比	-27～-20 dB
影响性能的参数	子载波集内用户数	4个、8个、16个
	控制速率提升倍数	2⁹、2¹⁰、2¹¹
	训练序列长度	511 bit、1 023 bit
	用户终端运动速度	1马赫、4马赫、8马赫
	系统采样速率/伪码速率	20.48 MHz、40.96 MHz

SC-CFDMA uplink symbol synchronization method based on multi-rate satellite-ground loop

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