The training sequence of channel estimation in frequency domain should have flat spectrum, which can estimate channel fast and exactly.
作为频域信道估计的训练序列要求具有平坦的频谱特性，可以快速准确地对信道进行估计。
A sound flat tax policy will benefit people on all portions of the income spectrum.
单一税将有利于各个收入阶层。
Both the Flat-Field method and the method which utilize the solar radiation spectrum are used on reflectance, inversion in order to transform radiant brightness image into reflectance, image.
并采用了平场域法、利用太阳辐射光谱两种方法对图像进行反射率反演，将辐亮度值反演为绝对反射率值。
The results of performance test show that the generator can generate chaotic noise with arbitrary distribution, flat power spectrum and good randomicity.
性能测 试结果表明：混沌噪声产生器能够产生具有任意分布和平坦功率谱的混沌噪声，且随机性较好。
The absorption curve on VS-spectrum of the former was flat and broad, while the latter was sharp and narrow and gave a bright blue shade.
前者可见光谱宽而平坦，而三啮结构的甲-铜络合物的吸收曲线则相对较窄而尖锐，色光较明亮。
The typical erbium-doped fiber gain spectrum is a combination of a high-intensity region and a flat part spectrum, and the power difference has limited the bandwidth of EDSFS.
典型的掺铒光纤增益谱线由一个谱峰和后面的谱肩组成，它们之间的功率差异造成了对光纤陀螺可应用的EDSFS带宽和平坦度的限制。
In order to achieve flat multi-wavelength output, a long-period fiber grating with loss peak at 1530 nm is used to obtain flat gain spectrum.
为了获得平坦的多波长输出，在谐振腔里使用了一个损耗峰位于1530nm处的长周期光纤光栅，以获得较为平坦的增益谱。
The noise spectrum at the modulator output is not flat.
调节器输出的噪声频谱并不平滑。
The noise spectrum at the modulator output is not flat.
调节器输出的噪声频谱并不平滑。
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