随着调制阶数的增加，正交空时分组码的性能越来越差，但传输速率变大；
If the modulation order is different, the higher the order is, the worse the performance is, but the transmitting rate is bigger.
对给定调制参数的余弦-高斯光束，通过适当选取分数傅里叶变化阶数可以获得平顶的光强分布。
A flat-topped beam can be achieved by a suitable choice of the transform order for the Cosine-Gaussian beams with the modulation parameter.
对调制器的结构和设计技术进行了研究，根据系统要求设计了量化器位数，调制器过采样比和阶数。
The architecture and design methods of - modulators are studied . based on it , the bits of quantizer , oversampling - ratio and the orders of modulator have been designed.
结果表明，作为调制通道的导模阶数越低，调制效率越高。
Results show that the lower guide mode acting as the modulation channel is, the larger modulation index can be obtained.
结果表明，作为调制通道的导模阶数越低，调制效率越高。
Results show that the lower guide mode acting as the modulation channel is, the larger modulation index can be obtained.
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