carrier-to-noise power ratio
carrier-to-noise power ratio 载波 carrier power to noise power ratio 载波功率与噪声功率比
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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.
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；
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