实际的OFDM系统通常会使用虚拟子载波，以此来避免发送信号受到发送端成形低通滤波器的影响。

In practical OFDM systems, virtual subcarriers are usually used to avoid the transmitted data being distorted by the low-pass filter on the transmitter side.

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实际的OFDM系统通常会使用虚拟子载波，以此来避免发送信号受到发送端成形低通滤波器的影响。

In practical OFDM systems, virtual subcarriers are usually used to avoid the transmitted data being distorted by the low-pass filter on the transmitter side.

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