甚高频数据交换系统(VDES)中的帧同步方案
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摘要
甚高频数据交换系统中,由于卫星相对船和地面站相对运动产生较大的速度差,从而造成接收信号有较大的多普勒频偏和传输时延。针对这类问题,基于甚高频数据交换系统的各链路,分别提出对应的高性能和高准确率的帧同步方案。该方案简单、易于实现,为对应链路的信号解调算法提供了解调参数,为提高整体链路的传输效率提供了依据。仿真结果表明,帧同步方案的频偏估计精度比较高,满足解调参数需求。
引文
[1]熊雅颖.海事通信技术新进展——VDES系统[J].通信世界,2016(2):35-40.
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[4]王佩.星载AIS系统设计及算法研究[D].北京:北京邮电大学,2014.
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[2]巩海方.谈甚高频数字交换系统(VDES)[J].中国海事,2016(3):53-55.
[3]吴团锋,杨喜根,李际平.一种基于FFT的联合帧同步和频偏估计算法[J].电子与信息学报,2006,28(5):840-843.
[4]王佩.星载AIS系统设计及算法研究[D].北京:北京邮电大学,2014.
[5]Gansman J A,Fitz M P,Krogmeier J V.Optimum and suboptimum frame synchronization for pilot-symbolassisted modulation[J].IEEE Transactions on Communications,1997,45(10):1327-1337.
[6]Choi Z Y,Lee Y H.Frame synchronization in the presence of frequency offset[J].IEEE Transactions on Communications,2002,50(7):1062-1065.
[7]Koo Y,Lee Y H.A joint maximum likelihood approach to frame synchronization in presence of frequency offset[C]//IEEE International Conference on Communications,2002,3(3):1546-1550.
[8]Recommendation M.2092-0,Technical characteristics for a VHF data exchange system in the VHF maritime mobile band(Recommendation ITU-R M.2092-0)[J].International Telecommunications Union,2015.
[9]Steendam H,Moeneclaey M.Low-SNR limit of the Cramer-Rao bound for estimating the carrier phase and frequency of a PAM,PSK,or QAM waveform[J].IEEE Communications Letters,2001,5(5):218-220.