frequency space的例句大全

An Improved Image Enhancement Method Using Nonlinear Extrapolation in Frequency Space

一种改进的频域非线性外推图像增强方法

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For the problem of image enhancement, an improved nonlinear extrapolation method in frequency space is proposed.

针对图像增强的问题, 提出了一种改进的频域非线性外推方法.

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Parsimonious methods were composed by the three groups i. e data transformation, additive tree and reconstruction of phylogenetic of phylogeny in frequency space.

俭约性方法中主要分为三类：数据转换方法、距离叠加树方法和频率空间重建系统发育的方法。

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An improved image enhancement algorithm by contour threshold nonlinear extrapolation in frequency space was proposed.

对非线性外推图像增强算法进行分析，充分考虑图像高频分量的局部特征，提出一种新的非线性滤波剪切策略包络阈值剪切算法。

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Imaging interferometric lithography ( IIL) uses multiple exposure to record different portions of the spatial frequency space of mask and greatly increases resolution.

成像干涉光刻技术（IIL）利用多次曝光分别记录物体空间频率的不同部分，极大地提高了成像质量，其中大角度倾斜照明是对OAI的扩展。

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The common diversity be classified as space diversity, polarization diversity, frequency diversity, and time diversity etc.

通常的分集有空间分集、极化分集、频率分集、时间分集等，本文对分集研究技术的研究主要是空间分集和极化分集在数字域的实现等。

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The relations between two dimension time frequency power spectrum and two dimension space frequency power spectrum, time frequency and space frequency are presented.

建立了二维时间频率功率谱与二维空间频率功率谱之间的关系；建立了时间频率与空间频率之间的关系；

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The performance of a Multiple Input Multiple Output ( MIMO) system in ideal and non-ideal propagation conditions, which is established using Space Time Coding and Space Division Multiplexing techniques and operates in a wireless indoor environment in the 17 GHz frequency band is discussed.

讨论了MIMO系统在理想和非理想传输条件下的性能，系统工作在无线室内环境17GHz频宽内。

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In this dissertation, the estimation algorithms of time-varying frequency selective channel in modern wireless communication systems including WCDMA uplink, WCDMA downlink with space time transmit diversity and MIMO system are investigated.

本文主要研究在现代无线移动通信系统中如何估计同时存在频率选择性和时间选择性衰落的信道，包括WCDMA上行链路，采用双天线空时发射分集的WCDMA下行链路和MIMO系统。

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A space-time-frequency ( STF) coded orthogonal frequency division multiplexing ( OFDM) transmitter diversity scheme for fast fading frequency selective channels is proposed. The proposed STF-OFDM transmission scheme owns time diversity gain.

提出了一种基于空间时间频率（STF）编码的正交频分多路复用（OFDM）发射分集方案，这种传输方案可用于频率选择性快衰落信道。

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A subspace-based blind channel estimator has been developed for space time coding orthogonal frequency division multiplexing ( STC-OFDM) system with two transmit antennas and two receive antennas.

针对使用2个发射天线和2个接收天线并且采用循环前缀的空时编码正交频分复用系统（STC-OFDM），提出了一种信道盲估计算法，并给出信道可被辨识的条件。

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Space time coded modulation has been shown to efficiently use transmits diversity in Raleigh fading channel. Then, the investigation indicates that decreasing the amounts of subbands, and utilizing the diversity characteristic adequately in frequency domain of OFDM is an effective approach to reduce the performance degradation.

文中接着通过研究表明，在子带自适应编码调制中，减少选取子带的个数，充分利用OFDM频域上的分集特性是一种可以降低信道时变带来性能恶化的有效途径。

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Mathematics analysis in frequency domain for sample time staggered space vector modulation technique

错时采样空间矢量调制技术的频域数学分析

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Study on the Space-Time Coding for Frequency and Time Selective Fading Channels

频率和时间选择性衰落信道下的空时编码技术研究

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The filter is featured with center frequency of 65.28 MHz, code rate of 4.08 Mbit/ s ( with tap space of 0.245 μ s) and duration of 250.735 μ s. The ratio of self related peak value to maximum sidelobe is 26 dB.

匹配滤波器的中心频率为65.28MHz，编码速率为4.08Mbit／s（抽头间隔为0.245μs），持续时间为250.735μs，自相关峰值与最大旁瓣比为26dB。

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However, the traditional diversity techniques, such as time diversity and frequency diversity, take up extra system resources. Although space diversity needs no additional resources, it is difficult to achieve in hardware.

但是传统的分集技术，如时间分集、频率分集，需要占用额外的系统资源，空间分集虽然不需要额外的资源，但是在硬件上难于实现。

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Sample time staggered space vector modulation ( STS-SVM) technique is a novel switching modulated strategy, which can acquire much high equivalent switching frequency at fairly lower device switching frequency and have excellent harmonic characteristics.

错时采样空间矢量调制是一种新型的开关调制策略，能够在较低的器件开关频率下实现较高等效开关频率的效果，具有良好的谐波特性。

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Natural Frequency Formulas for Underground Structures with Consideration of Infinite Space Effect of Rock Medium

计入岩土介质无限空间效应的地下结构自振特性计算公式

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The coaxial inner slotted structure waveguide is simulated and analyzed numerically, the change of the work frequency and space between work modes of coaxial structure is studied with the inner slotted.

通过仿真和数值分析，研究了同轴波导加内开槽后模式之间间隔和工作频率前后的变化情况；

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At the same time, space vector groups are optimized, the optimized SVPWM can guarantee output performance of converter does not fall when switching frequency properly decrease.

采用优化后的开关矢量，可以在减小器件开关次数的情况下，仍能保证变频器输出性能。

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