FBMC系统改进序列算法的定时同步技术  

Timing Synchronization Technology of Improved Sequence Algorithm in FBMC System

作　　者：李同庆 宋志群[1] 刘玉涛[1] 魏恒舟 LI Tongqing;SONG Zhiqun;LIU Yutao;WEI Hengzhou(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团第五十四研究所,石家庄050081

出　　处：《电讯技术》2023年第3期421-426,共6页Telecommunication Engineering

摘　　要：为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进行改进并引入到FBMC系统中。利用共轭对称结构能够提高定时精度和加权处理能够更好地抵抗频偏影响的特点设计同步序列,进行共轭对称和加权处理。仿真结果表明,基于改进序列的Park算法相较共轭对称序列的TR1算法,其信噪比提前3 dB达到了100%定时准确率,实现了低信噪比下的高精度定时同步,且具有更强的抗频偏性能;相较原Park算法,相同信噪比下,改进序列的Park算法的频偏均方差(Mean Square Error,MSE)也小于原Park算法的频偏MSE,抗频偏性能表现更优。To improve the timing synchronization accuracy and anti-frequency offset performance of filter bank multicarrier(FBMC)system under low signal-to-noise ratio(SNR),the improved Park measure function in timing synchronization is introduced into FBMC system based on the similarity between FBMC system and orthogonal frequency division multiplexing(OFDM)system.Synchronous sequences are designed by using the features that conjugate symmetry structure can improve the timing accuracy and the weighting process can better resist the influence of frequency offset.Simulation results show that compared with that of TR1 algorithm based on conjugate symmetric sequences,100%timing accuracy of the proposed algorithm is reached with 3 dB SNR ahead and high precision timing synchronization is achived under low SNR with stronger anti-frequency offset performance.Compared with that of the original Park algorithm,under the same SNR,the frequency offset mean square error(MSE)of the Park algorithm with the improved sequence is also smaller,and the anti-frequency offset performance is better.

关 键 词：滤波器组多载波(FBMC)系统 定时同步 训练序列 抗频偏性能 

分 类 号：TN919.3[电子电信—通信与信息系统]