子载波调制矢量包括信息元分量和抑制元分量。
The modulating vectors for the subcarriers consist of the information-bearing components and the reduction components.
一定的传输距离和发射光功率情况下，不同的子载波数存在一个最佳的光调制指数，使得系统载噪比最大；
Under a certain deliver distance and the light power, the different sub-carries number to exist a best optical modulation index, making the system's carrier-to-noise ratio biggest.
它先将原始数据流复制成多路并行数据，经频域扩频和时域扩频，再调制到互相正交的子载波上传输。
It copies the original data stream to several parallel data streams, spreads them in both time and frequency domain, then modulates them to orthogonal sub-carriers for transmission.
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