理论分析和仿真实验证明，在负信噪比条件下该方法可有效提高对DS-SS信号载波的检测能力。
Then we detect and estimate the carrier frequency of negative SNR DS-SS Signal have done. Theoretic analysis and simulation prove the validity of the arithmetic.
讨论了高动态、低信噪比、长伪码序列扩频信号的伪码捕获、跟踪、载波跟踪与数据解调方法。
The paper discusses the acquisition and tracking of the PN code and the tracking of the carrier in high dynamic range , low SNR and long PN code.
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。
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.
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。
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.
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。
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.
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。
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.
并采用新的相位估计方式估计含相位噪声的载波相位，提升了该条件下的环路信噪比。
With improved phase estimation method, a carrier signal phase with phase noise can be estimated, while loop SNR also increases.
方案中提出了：相关搜索、FFT检测信号载波的方法，解决了低信噪比、大频差条件下扩频码的同步捕获难题；
The method was Correlate search and FFT carrier detection, which could solve the problem of the capture of the spread spectrum code under the condition of low SNR and big frequency offset.
研究了LS算法及其DFT改进算法，并将高斯白噪声信道中的信噪比估计方法引入到单载波频域均衡系统中。
LS algorithm and DFT-based algorithm were studied and signal-to-noise estimation algorithms in AWGN channel were introduced to SC-FDE systems.
研究了LS算法及其DFT改进算法，并将高斯白噪声信道中的信噪比估计方法引入到单载波频域均衡系统中。
LS algorithm and DFT-based algorithm were studied and signal-to-noise estimation algorithms in AWGN channel were introduced to SC-FDE systems.
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