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信噪比

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The feature list correlation algorithm can be adopted in the calculation of the similarity measurement of the machine vision object matching.

机器视觉目标匹配中,匹配相似性测量应用特征列表相关算法计算,可有效减少处理时间,并且匹配具有较高的峰值系数和峰值信噪比,可以清晰识别目标。

For the machine vision object matching, the feature list correlation algorithm can be adopted in the calculation of the matching similarity measurement.

目标匹配识别中,特征列表相关算法可以有效减少计算时间,匹配具有较高的峰值系数和峰值信噪比,清晰识别目标。

Accuracy of pre-stack migration velocity analysis is impacted by S/N and resolution of seismic data, geometry (mainly about observation aperture) and imaging method, which is difficult for quantitative evaluation.

叠前偏移速度分析的精度受地震数据的信噪比和分辨率、地震观测系统及成像方法的影响,很难进行定量的估计。

Pre-Tertiary oil reservoirs in the South Yellow Sea are old and deeply buried, and there are some difficult problems to be solved in the seismic explorations such as weak reflection energy, low signal-to-noise ratio and poor imaging quality.

南黄海前古近系油气储层时代老、埋藏深,地震勘探中仍存在反射能量弱、信噪比低和成像质量差等难题。

In this paper, we present the idea of virtual plate for aspheric testing based on moire phase-shifting technology, i.e. when testing steep aspheric wavefronts, interferometry directly used CCD camera for high resolution to obtain supervision with interferometry saved in the frame memory produces moire patterns. Finally, we cancel the noise by means of low pass frequency .

在检测非球面波前时,我们改变以往传统的零位补偿检验手段,而利用高分辨率的CCD相机直接对被检非球面进行数据采样,并把获得的干涉条纹和预先储存在储存器里的参考干涉图进行叠加,从而得到电子莫尔条纹,然后对获得的电子莫尔条纹进行低通滤波,滤掉噪声中含有的高频成分,以提高图像的信噪比

The signal-noise ratio model is theoretical basis of optimization system design and uprating system imaging ability.

信噪比模型的建立为进一步优化系统设计、提高系统成像能力提供了理论基础。

Simulations show the effectiveness and feasibility to reduce the loss of surds and to enhance the SNR (Signal-to-noise Ratio).

该方法在很大程度上抑制了噪声,又减少了语音段清音的损失,提高了信噪比。仿真结果表明了该方法的可行性和有效性。

We design an efficient measurement to estimate the skywave delays, and get the arrival time of groundwave and skywave separately in poor SNR.

该文设计出一种估计天波延迟的高效处理方法,在低信噪比条件下分离出了地波和天波的到达时刻。

However, this is mostly true for signals we receive directly, like noise sources, and not so much for signals from broadcast stations coming to us through skywave propagation. I aim the antenna for minimum noise pickup, which results in the best signal to noise ratio. In some situations it is quite possible to fully tune out a noise source such as a TV or computer monitor.

喜欢听干扰台的有福了,VOA和干扰台的信号不会是一个方向来的,把环对准VOA信号最强的方向,那么在另外方向的干扰信号就会衰减,VOA来的斗争指示你会听得更清),我更感兴趣的是最小噪声拾取,这会带来会好的信噪比,在一些情况下,很有可能将电视或电脑带来的噪声剔出出去。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法,给出了导频图案,通过仿真实验表明,该算法与理想的信道状态信息曲线非常接近,信噪比差距约在2dB左右,并且在快衰落条件下具有较好的稳定性,其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点,论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统,模拟了整个系统的信号流程,进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能,并根据各种不同的条件:例如高斯噪声、多径衰落、有无保护间隔等,对系统的误码特性进行了评估,为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导,提出了以256点IFFT/FFT为核心和以512点IFFT/FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案,它们在参数选取和性能指标上有所差异,均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置,针对本设计系统的应用环境和系统硬件的性能速率,提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡,结合模拟前端搭建数字中频平台,设计了基带处理的DSP软件模块并进行系统调试,基本实现了一套完整的OFDM调制解调方案。

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Plunder melds and run with this jewel!

掠夺melds和运行与此宝石!

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻,也许正是在通往天国的路上,我体验着这白色的晕旋。

When you click Save, you save the file to the host′s hard disk or server, not to your own machine.

单击"保存"会将文件保存到主持人的硬盘或服务器上,而不是您自己的计算机上。