一种新的OFDM系统载波频率偏移估计和跟踪方案
A Novel Carrier Frequency Offset Estimation and Tracking Scheme for OFDM
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摘要: 针对载波偏移使OFDM系统出现严重的子载波干扰和性能的下降，该文提出一种OFDM频偏估计和跟踪方案，载频捕获阶段频偏估计采用时域内插入等值导频的方法，载频跟踪阶段不需要导频，而是利用循环前缀来估计频率偏移并进行校正。仿真结果证实，该方案中导频辅助的频率偏移估计和载频跟踪不仅估计范围大，而且估计值准确，频偏校正后系统的性能能达到信道理想估计条件下的误比特率。Abstract: In this paper, a carrier frequency offset estimation and tracking scheme for OFDM is presented. Pilot-Symbol-Aided (PSA) estimation is used to estimate carrier frequency offset in OFDM system, and the carrier frequency tracking applies the cyclic prefix. The simulation results prove the PSA estimation of frequency offset is precise, and the carrier frequency tracking is available.
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Schmidl T M, Cox D C. Robust frequency and timing synchronization for OFDM[J].IEEE Trans.on Comm.1997, 45(12):1613-1621[2]Moose P H. A technique for orthogonal frequency division multiplexing frequency offset correction[J].IEEE Trans. on Comm.1994, 42(10):2908-2914[3]Zhao Y, Haggman S G. Sensitivity to Doppler shift and carrier frequency errors in OFDM systems-The consequences and solutions. in Proc. IEEE 46th Vehicular Technology Conf.,Atlanta, GA, Apr.28-May 1, 1996: 1564-1568.[4]Cimini L J. Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing. IEEE Trans. on Comm., 1985, COM-33(7): 665-675.[5]Chen Bor-sen.[J].Tsai Chang-lan. Frequency offset estimation in an OFDM system. 2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications, Taoyuan, Taiwan, (SPAWC01.2001,:-[6]Chang Sekchin, Powers E J. Cancellation of inter-carrier interference in OFDM system using a nonlinear adaptive filter. 2000 IEEE International Conference on Communications, 2000 (ICC2000). New Orleans, LA, USA, 2000, 2: 1039-1043. -
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