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Waveletanalysisusingsofthresholdingfilteringinlect
- 在采集信号时,如果传感器没有前置放大, 则传感器输出的压电信号的信噪比会比较低。本文利用小波域软阈值滤波方法对未采用前置放大而采样得到的 信号进行小波分析,大幅度地提高了信号的信噪比,提取的目标信号位置与理论位置吻合的很好。这表明可以通 过小波分析方法很好地改善热超声信号的信噪比,从而降低对微波致热超声成像采集系统中前置放大器的要求-When human tissue is irradiated by microwave pulses, there is thermo2acoust
dtect-small-target
- An Efficient Method of Small Targets Detection in Low SNR. infrared image .single fly target-An Efficient Method of Small Targets Detection in Low SNR. infrared image .single fly target
gjlj
- 重点研究 了低信噪比﹑多径瑞利衰落信道条件下，基于高阶累积量的OFDM信号盲识别技 术。提出了利用奇数阶累积量区分OFDM信号与单载波信号的方法，并对基于三 阶和五阶累积量的算法进行了仿真分析。 -﹑ Focus on the low SNR multipath Rayleigh fading channel conditions, based on cumulant OFDM signal blind identification technology. Made a dist
Non-linear-quadratic-programming
- 描述底层流体和岩性特征，为储层的进一步识别提供更多的物性参数-Describe the properties of subsurface fluid and lithology,and perfectly retrived for further analysis even on the SNR was low
OFDM-signals-with-low-SNR
- 针对认知无线电系统中正交频分复用( OFDM )信号参数估计这一重要问题, 利用OFDM 信号的循环谱实现了符号周期的盲估计。-For cognitive radio systems, orthogonal frequency division multiplexing (OFDM) signal parameter estimation of this important issue, the cyclic spectrum of the OFDM signal to achieve the
channel-aware-decsision-fusion
- Information fusion by utilizing multiple distributed sensors is studied in this work. Extending the classical parallel fusion structure by incorporating the fading channel layer that is omnipresent in wireless sensor networks, we derive the lik
on-the-modulation-technology-in-OFDM
- 在 OFDM 数学原理和收发模型的基础上，本文对帧同步、定时同步、频率同 步和采样同步给 OFDM 系统所产生的影响进行了理论分析，同时讨论了基于循环 前缀或训练符号的典型 OFDM 同步算法。参考 802.11a 突发数据帧结构和系统参 数，分析几种 OFDM 同步算法用于突发分组传输的性能；在分析了几种经典的信 道估计算法基础上,通过对复杂度和性能的折衷，选择一种适合本文系统的估计 算法。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
Image-Denoising-by-Adaptive-Kernel-Regression
- This paper introduces an extremely robust adaptive denoising filter in the spatial domain. The filter is based on non-parametric statistical estimation methods, and in particular generalizes an adaptive method proposed earlier by Fukunaga [1]
cyclostationary-at-low-snr
- cooperative cyclostationary in cognitive radio at low SNR , a good reference
PSKmodulation
- 提出了一种不仅计算量小，而且可以在低信噪比下正确识别相位调制信号的方法。利用Matlab工具进行仿真，仿真结果表明，在信噪比不低于2 dB的情况下，对PSK子类调制信号的识别率可以达到93 以上。 -Proposed a method of calculating only a small amount, and can correctly identify the phase modulation signal at a low SNR. Use Matlab tool for simul
sigma-delta-modulation
- 高精度、低功耗模数转换器是当今集成电路设计模拟领域的研究热点之一，采用sigma-delta调制原理和过釆样原理的模数转换器广泛使用在音频、数字网络、电子测量等系统中。此类模数转换器，为降低信号带内的量化噪声功率，而釆用噪声整形技术，为提高模数转换器的信噪比，使用过采样技术，将基带中的量化噪声调制到了高频区域，这样就增加了基带中的信噪比，也就是增加了转换器的有效量化位数，由于采用较高的过采样率，Sigma-Delta ADC的转换速率相对较低，高精度和较低转换速率的特点，使得Sigma-Delt
QPSK
- Direct sequence spread spectrum (DSSS) communication systems has been widely used in these years for its advantage of wide spectrum, low working Signal-to-Noise ratio (SNR), anti-interference, anti-multipath effect and capability of LPI and LPD.
bit-and-power-loading2
- 本文提出了一种算法，根据不同的噪声容限分配数据位，从而实现不等错误保护（UEP）。 新的方法是基于非UEP分配算法。新算法设计通过集成一个新的SNR-排序方案，可抗非平稳脉冲噪声和信道变化。仿真结果表明，该高度保护的比特流分布在低信噪比的大量载波上，从而确保由非平稳噪声信噪比引起的变化，不会多少影响这些载波。此外，窄带干扰不会干扰大量的重要数据。-This paper proposes an algorithm that distributes bits according to diffe
carrier-synxronization-OQPSK
- This article contains analyses of the performance of various carrier synchronization loops for offset quadrature phase-shift-keying (OQPSK) modulation, all motivated in one form or another by the maximum a posteriori (MAP) estimation of carrier
DVB_S2X
- 2014 年2 月，DVB 组织通过了最新的DVB-S2 扩展版技术规范DVB-S2X。DVB-S2X 作为第二代卫星广播电 视标准DVB-S2 的扩展，能够进一步提高带宽利用率，并为未来可能出现的移动应用提供了甚低信噪比(VL-SNR) 模式。 本文重点介绍和分析了DVB-S2X 几项新的技术改进。-In February 2014, DVB Organization adopted new DVB-S2 specification extended edition DVB-S2X.
linear-Bregman-super-resolution-
- 低信噪比下的二维联合线性布雷格曼迭代快速超分辨成像算法 文章-Low SNR two-dimensional joint linear Bregman iteration of the fast super-resolution imaging algorithm.