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；
But to the CW pulse signal with changing carrier wave frequency, common filter cannot achieve narrowband filter, whereas broadband filter cannot reach the request of the signal-noise ratio.
可是，对于载波频率不断变化的CW脉冲信号，普通的滤波器难以实现窄带跟踪滤波，而宽带滤波又不能达到提高信噪比的要求。
From signal to noise ratio analysis of the modulation signal, we choose the phase modulation method as the suitable carrier modulation for the twisted-pair.
本章首先分析了各种数字载波调制方法，从调制信号信噪比的角度分析说明基于相位调制的方法适合作为双绞线载波调制的方法。
Their main function is to simulate the satellite signal from the really satellite on the satellite orbit through changing code phase, Doppler shift, carrier and signal-to-noise ratio.
其主要功能就是通过改变码相位、多普勒频移、载波和信噪比来模拟卫星轨道上真实卫星发射的信号。
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.
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。
To the question of Carrier Synchronization with low signal-to-noise ratio (SNR) and High Dynamic , using the method of combining FLL with PLL to actualize the carrier tracking.
针对极低信噪比高动态条件下载波同步问题，采用锁频环（FLL）和锁相环（PLL）相结合的方法来实现载波跟踪。
Aiming at problem of precisely carrier tracking on the condition of high dynamic and low signal-to-noise ratio, four schemes are proposed in this dissertation.
针对高动态、低信噪比条件下的载波精跟踪问题，本文提出了四种解决方案。
Aiming at problem of precisely carrier tracking on the condition of high dynamic and low signal-to-noise ratio, four schemes are proposed in this dissertation.
针对高动态、低信噪比条件下的载波精跟踪问题，本文提出了四种解决方案。
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