Synchronization error will lead to inter symbol interference as well as inter carrier interference. Therefore, synchronization is extremely crucial to OFDM systems.

同步错误不但会导致符号间干扰，还会导致信道间干扰，因此同步是OFDM的关键技术。

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Moreover, serious ISI (Inter-Symbol Interference) and ICI (Inter-Carrier Interference) can be readily circumvented by introducing CP (Cyclic Prefix).

而且，循环前缀的引入消除了符号间干扰(ISI)，避免了信道间干扰(ici)。

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When a synchronization error exists, the orthogonality between sub-carriers can't be maintained, serious inter-carrier interference is introduced and demodulation performance will be degraded greatly.

当存在同步错误时，子载波之间的正交性遭到破坏，从而引起严重的载波间干扰，使解调性能大大下降。

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