光拍频干扰噪声大大地降低了单信道的载噪比，严重地劣化了系统的性能，因而必须加以抑制。
OBI noise drastically reduces CNR of each channel and seriously degrades the system performance, therefore must be suppressed.
为了提高收视质量，对系统设计中的载噪比和复合三次差拍（CTB）指标必然提出更高的要求。
As a result, it would carse more serious noiSe and distortion, In order to improve the reception quality, we are asked to make better design of a carrier for its noise ratio and CTB target.
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.
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