基于同步数字通信接收机的载波频偏补偿算法
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摘要
针对无线数字通信中的载波频率同步问题,提出一种适用于同步数字通信接收机的载波频率偏移(CFO)估计算法。本算法适用于任何技术标准,估计范围大,对固定CFO范围时无法得到充足的前导符号相位信息场景尤其适用。其具备不局限于前导符号的性质、定时同步和CFO估计最大值不受前导周期影响等优点。首先利用分数时间段得到粗略的CFO估计,然后借助前导符号周期的相位差信息对上述结果进行改进,从而得到精确的CFO估计。最后通过仿真证明了算法的性能。
A carrier frequency offset(CFO) estimation algorithm for synchronous digital communication receivers is proposed for carrier frequency synchronization in wireless digital communication. This algorithm is applicable to any technical standard, and the estimation range is large, and is especially suitable for scenes where sufficient preamble phase information cannot be obtained when the CFO range is fixed. It has the advantages of not being limited to the nature of the preamble symbol, timing synchronization and maximum CFO estimation not being affected by the preamble period. Firstly, a rough CFO estimate is obtained by using the fractional time period. Then, the above results are improved by means of the phase difference information of the preamble period, so as to obtain an accurate CFO estimate. Finally, the simulation indicates the performance of this proposed algorithm.
A carrier frequency offset(CFO) estimation algorithm for synchronous digital communication receivers is proposed for carrier frequency synchronization in wireless digital communication. This algorithm is applicable to any technical standard, and the estimation range is large, and is especially suitable for scenes where sufficient preamble phase information cannot be obtained when the CFO range is fixed. It has the advantages of not being limited to the nature of the preamble symbol, timing synchronization and maximum CFO estimation not being affected by the preamble period. Firstly, a rough CFO estimate is obtained by using the fractional time period. Then, the above results are improved by means of the phase difference information of the preamble period, so as to obtain an accurate CFO estimate. Finally, the simulation indicates the performance of this proposed algorithm.
引文
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[2]Hwang T,Yang C,Wu G,et al.OFDM and Its Wireless Applications:A Survey[J].IEEE Transactions on Vehicular Technology,2009,58(4):1673-1694.
[3]Abdzadeh-Ziabari H,Shayesteh M G.Robust Timing and Frequency Synchronization for OFDM Systems[J].IEEE Transactions on Vehicular Technology,201160(8):3646-3656.
[4]Yang T,Hu L.An Improved Frequency Offset Estimation Algorithm For OFDM System[C]//2010 International Conference on Information,Networking and Automation(ICINA).Kunming:IEEE,2010:10-13:IEEE,2010.
[5]Moose P H.A Technique For Orthogonal Frequency Division Multiplexing Frequency Offset Correction[J].IEEE Transactions on Communications,199442(10):2908-2914.
[6]Classen F,Meyr H.Frequency Synchronization Algorithms For OFDM Systems Suitable For Communication Over Frequency Selective Fading Channels[C]//Vehicular Technology Conference,1994 IEEE 44th[s.l.]:IEEE,1994:1655-1659.
[7]Miaoudakis A,Koukourgiannis A,Kalivas G.Carrier Frequency Offset Estimation and Correction for Hiperlan/2 WLANs.[C]//International Symposium on Computers&Communications.IEEE,2002:693-698.
[8]Ieee B E.IEEE Standard for Local and Metropolitan Area Networks--Part 15.4:Low-Rate Wireless Personal Area Networks(LR-WPANs)[C]//IEEE Std802.15.4-2011(Revision of IEEE Std 802.15.4-2006)[s.l.]:IEEE,2011:1-212.