研究了改进的基于特征子空间的平滑算法，加深了零陷深度，提高了系统的信噪比。
The improved smooth algorithm based on the characteristic sub-space used deepen the null to fall the depth, enhanced the system's signal to noise ratio.
在低信噪比情况下，提出了一种基于循环对角码的改进的酉空时码设计。
Based on cyclic diagonal codes, an improved design of unitary space-time codes (USTC) at low SNR is proposed.
用平均分段信噪比和感知语音质量评价(PESQ)测试，改进算法编码质量接近于g。
Testing with the average segment SNR and Perceptual Evaluation of Speech Quality (PESQ), the improved algorithm is close to g.
针对超声无损检测中超声信号受噪声污染、信噪比不高的情况，提出了一种新的基于改进阈值函数的小波域超声信号去噪方法。
Aimed at the ultrasonic signal polluted by noises, which is low in SNR, a method of the ultrasonic signal denoising in wavelet domain based on an improved threshold function was put forward.
最后提出了一种改进的评价方法——视觉加权信噪比模型(VWSNR)。
Finally, an improved algorithm of image quality assessment is presented, which is Vision and Weighted Signal-to-Noise Ratio (VWSNR).
为了处理低信噪比（S/N）的VLBI观测数据，我们对现有的条纹搜索方法做了改进。
We have improved fringe search method for processing VLBI data at low signal-noise ratio (S/N).
仿真实验显示：无论是信噪比还是最小平方误差，改进的软阈值函数比其它三种改进的阈值函数的效果都要好一些。
Simulations show that the improved soft-thresholding function is obviously better than the other three improved thresholding functions in terms of SNR and MSE.
文中根据对输入信噪比的估计，在NLMS算法基础上提出一种改进的LMS算法。
According to the estimated SNR of input signals, this paper proposes a modified LMS algorithm on the basis of the NLMS algorithm.
最后分别对改进的FFT校频技术及锁相环进行了仿真分析，结果表明该方法在低信噪比下仍具有良好的性能。
Finally, a simulation analysis for the improved FFT frequency correction technology and phase-lock loop is maked, the result shows that the method also has a good performance in the low SNR situation.
最后，论文提出了一些新的自适应技术，如波特率估计、信噪比估计等，并给出了应用这些技术的自适应调制解调器的改进方案。
Finally, the thesis proposes several newly adaptive technologies, like the estimation of baud rate and SNR. And corresponding improvements are also discussed.
实验结果表明，与传统的EZW算法相比，该改进算法明显提高了图像压缩的峰值信噪比。
Experimental result shows that compared to the traditional EZW, the improved algorithm can increase the peak signal to noise radio (PSNR for short) of image compression.
最后作者提出一种改进型LS信道估计算法，该算法考虑了LS算法中噪声的影响，从而提高了低信噪比下信道估计的精度。
Finally, an improved channel estimation algorithm based on LS algorithm is presented. Considering the infection of the noise, the new algorithm has better performance under low SNR.
实验结果表明：改进算法的复杂度明显降低，且信号识别正确率及适用信噪比范围都有很大程度的提高。
The experimental result shows that the complexity of the improved method is reduced greatly. Furthermore, the correct recognition rate and the range of SNR are also increased significantly.
为提升NQR信号信噪比，根据NQR信号的特点，提出了一种基于改进阈值函数小波变换的NQR信号去噪方法。
In this work, a signal process method for NQR signals is presented, which is based on wavelet transform and specially designed for the detection of pentaerythritol tetranitrate with NQR.
摘要：目的提出一种改进的基于区域增长的水脂分离方法，使其可以在低信噪比情况下更可靠。
Abstract: Objective An improved water-fat separation method based on region -growing was proposed for use in regions with low signal-noise ratio (SNR).
数值试验结果表明，新模型在信噪比等方面比单纯的用一种滤波有较大的改进。
Numerical experiments show that the combined model has more improvement on signalnoiseratio(SNR) than using only one filter.
实验结果表明，SPIHT改进算法与原来的SPIHT算法相比，在相同的压缩比下可以获得更高的峰值信噪比。
Experiments show that the improved SPIHT algorithm could provide higher PSNR value than the original SPIHT algorithm at the same compression rate.
基于有限衍射波束的高帧率超声成像系统能实现快速成像，但由于仅通过一次发射事件成像，信噪比较低，本研究针对该问题提出一种改进方案。
The poor image quality in the high frame rate (HFR) ultrasonic imaging system is due to the fact that only one transmission event is used for constructing images.
而在HSL颜色空间，构建了一类基于多结构元形态的边缘梯度…更多检测算法，提出了改进的多结构元彩色形态边缘检测算法，并作了信噪比比较分析。
The improved method of realizing edge detection is proposed based on multi-structuring elements color morphological, and comparative analysis of signal to noise ratio has been made.
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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