为了减小正交频分复用系统受频率偏差的影响，在OFDM系统中设计了一种新的载波频偏估计算法。

To reduce the impact of carrier frequency offset in OFDM system, this thesis designs a new carrier frequency offset estimation scheme for OFDM system.

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OFDM系统自身的正交多载波调制特点，决定了其对定时误差和载波频率偏差十分敏感。

The orthogonal multicarrier modulation, which is the main character of OFDM, determines that it is very sensitive to both timing synchronization error and carrier frequency offset.

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定时偏差会导致码间干扰，频率偏差会破坏子载波间的正交性，引起子载波间干扰，从而使系统整体性能急剧下降。

Timing offset causes inter-symbol interference, and frequency offset would destroy the orthogonality between subcarriers, causing ICI, which lead to a sharp decline in overall system performance.

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