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中文摘要：
在OFDM系统重复结构频偏估计的基础上，提出了基于多符号封装正交频分复用（MSE-OFDM）重复结构的大范围频偏估计方法；基于最大似然准则的时域信道估计方法和训练序列的峰均比尽可能小的条件，找到了一种时域峰平比恒定、频域比较平坦的MSE-OFDM信道估计用的训练序列．仿真结果表明，所提出的信道和频偏估计方法有效地提高了系统性能且训练序列时频域均比较平坦．
英文摘要：
Based on frequency-offset estimation for the OFDM system, a frequency-offset estimation technique for the Multi-symbol encapsulated OFDM system utilizing the repetitive signal structure to enlarge the estimation range is implemented. The channel estimation method based on the maximum likelihood principle is proposed, in which the training sequence has a relatively fiat spectrum and constant peak to average ratio（PAR）. Simulation results indicate that the proposed frequency offset and channel estimation methods are feasible for the MSE-OFDM system and improve its performance with a training sequence flat in the time and frequency domain.
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