But OFDM is very sensitive to frequency offset and phase noise, so synchronization is the key problem for OFDM system.

但是OFDM技术对频率偏移和相位噪声很敏感，所以同步是OFDM系统中的关键问题。

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It is proved that UV channel is a minimum phase system and can use blind equalizer. Ber is not sensitive to the step size and tap number for CMA blind equalizer.

还证明了紫外信道是最小相位系统，可以进行盲均衡，结果指出，只要迭代次数足够，CMA盲均衡器输出误码率与滤波器阶数、迭代步长关系不是很明显。

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This system combines a highly insulated cooler with a liquid nitrogen reservoir so to maintain temperature sensitive samples at vapor phase temperatures.

该冷却器高度绝缘，带有液氮容器，保持样品的气相温度。

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