摘要
为了提高BPM短波数据服务性能,一种有效的途径是研究合理的数据调制方式。针对现有BPM短波授时系统的时码发播实验方案存在数据传输率低、易受干扰等问题,在不影响现有系统信号格式的基础上,提出一种可应用于BPM短波授时系统的高速率OFDM(orthogonal frequency division multiplexing)数据调制方式。给出了一种兼容性设计方案,分析了基带OFDM系统模型,提出了一种基于频率分集的OFDM数据调制方式以抵抗短波信道的频率选择性衰落。通过理论分析与几种具有代表性的参数设计方案的仿真实验,初步验证了提出的数据调制方式的有效性,同时针对实际工程应用给出了一些有参考价值的结论与建议。
Studying a reasonable mode of data modulation is an effective approach to improve the performance of BPM HF data service.Aiming at the problem of low data transmission rate and easy to be interfered in existing BPM HF time service system,a new high speed OFDM(orthogonal frequency division multiplexing)data modulation method which can be applied to BPM HF time transmitting system is proposed in this paper,without affecting the existing system signal format.Firstly,a compatibility design scheme is given;then,the baseband OFDM system model is analyzed,and a frequency diversity based OFDM is used to resist frequency selective fading of the shortwave channel;finally,the related parameters of the system implementation plan are calculated.Through theoretical analysis and simulation experiments of several typical parametric design schemes,the validity of the proposed data modulation method is preliminarily verified.At the same time,some valuable conclusions and recommendations are given for practical engineering applications.
作者
袁江斌
华宇
李实锋
闫温合
胡召鹏
YUAN Jiang-bin;HUA Yu;LI Shi-feng;YAN Wen-he;HU Zhao-peng(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《时间频率学报》
CSCD
2019年第2期169-175,共7页
Journal of Time and Frequency
基金
国防创新基金资助项目(CXJJ-16Q209)
中国科学院“西部之光”人才培养计划西部青年学者B类基金资助项目(Y507YR6301)
关键词
BPM
数据调制
正交频分复用技术
频率分集
BPM
data modulation
orthogonal frequency division multiplexing(OFDM)
frequency diversity
