A novel design of OFDM-based space-frequency codes is proposed such that the maximum achievable diversity gain is available.
提出了一种基于OFDM达到最大可达分集增益的空频码设计方案。
Last, for the problem that the high decode complexity of space-frequency code, detailed steps of sphere decode algorithm is provided.
最后针对空频码解码采用最大似然译码复杂度较高的问题，给出了球形译码算法的详细步骤。
The complex sphere decoding has lower complexity compared with real sphere decoding for space-frequency block codes with PSK modulation.
对于PS K调制下的空频块码，复数球形译码相对实数球形译码有较低的复杂度。
The mechanism of the performance degration for space-frequency spectrum estimation due to ChannelMismatching and Sensor Coupling is analyzed.
分析了空间谱估计中多信号源方向和频率估计中通道失配和阵元互耦导致系统性能下降的机制。
Based on OFDM system, a novel space-frequency-time code which combined trellis-coded modulation with differential space-time block code was proposed.
基于OFDM(正交频分复用)系统，提出了一种新的空频时三维编码，将网格编码调制和差分空时分组码进行组合链接设计。
The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
The differential coding is performed in the time domain, while the space-frequency coding is processed in the frequency domain to achieve the diversity ga.
该方法在时域进行差分编码，而在频域进行空频编码以获得分集增益。
In this paper, we propose a diagonal space-frequency (DSF) block codes over frequency-selective Rayleigh fading channels and study performance of the code.
本文提出了频率选择性瑞利衰落信道中的对角空频分组码(DSF)，研究了码的性能。
The MIMO-OFDM channel estimation method is researched based on the system design, and a space-frequency domain optimal pilot-tones design algorithm is presented.
从系统设计角度研究了MIMO-OFDM系统的信道估计方法，提出一种基于空频域的最优导频设计算法。
Underwater acoustic channel is a time-space-frequency variant channel, having a character for narrow bandwidth, high ambient noise level and strong interference of multipath.
而由此构成的水声信道是一个空间与频率响应随机快速变化的传输信道，存在窄带、高噪及强多途干扰。
The Internet cookie Report page of the Security Space Web site offers some frequency analysis through associating the cookie names with the server that issues them.
SecuritySpaceWeb网站的InternetcookieReport网页通过将这些cookie的名称和发行它们的服务器联合起来，从而提供了一些频率分析。
Patterns in the data: the frequency of recurring patterns in the data determines how effective compression will be for a particular table space or partition.
数据中的模式：对于特定的表空间或分区，数据中重复出现的模式的出现频率将决定压缩的效果。
In this paper, a method imaging with variant space frequency linear interferometric fringe is presented and is demonstrated by experiments.
本文提出利用变空间频率直线干涉条纹对目标成像的方法，并用实验进行验证。
The space frequency distribution on rear focal plane restores to the distribution of complex amplitude on image plane.
后焦面上的频率分布还原成像面上的光场复振幅空间分布。
The procedure for deriving the stochastic road irregularities is given with the application of space frequency domain road model.
从空间路面频率谱出发给出了模拟随机路面谱的方法。
The utilization rate of licensed spectrum is very low in the time domain, frequency domain and space domain, while the unlicensed band is overcrowded seriously.
大部分授权频段在时域、频域和空间域的利用率很低，而公共频段出现了严重的频谱拥挤。
Atomic frequency Standard is the frequency and time benchmark of space technology and time awarding system, directly determining the quality of satellite communications.
原子频标是空间技术和授时系统的频率与时间基准，直接决定了卫星通信的质量。
This scheme is based on the rotor flux, through the fixed switching frequency and using space vector modulation (SVPWM) method vector control.
本文方案是基于转子磁链定向、通过固定开关频率、运用空间矢量调制(SVPWM)方法的矢量控制。
Weapon systems, communication systems and so on in the modern war send electromagnetic waves with different intensity and frequency, which are pollution to the space.
在现代战场中，武器系统、通讯系统和干扰系统等均会发射出强度、频率不同的电磁信号，这些电磁信号会对战场空间构成严重的电磁污染。
When the driving frequency is high enough, a large number of ions are trapped and the induced space charge field makes a great many of electrons stay in the discharge volume.
当外加电压频率足够高时，大量离子被俘获在放电空间，空间电荷场又引起足够多的电子滞留在放电空间。
The L F signals are transformed by entropy based on wavelet packet algorithms for best basis selection, and the results are displayed in time- frequency space namely phase plane.
该方法采用基于熵的小波包最佳基选取准则，对局部损伤信号进行自适应小波包分解，将分解结果显示于时—频空间即相平面上。
If the space shift invariance is replaced by the time shift invariance, the high resolution frequency estimation can be obtained using a single vector sensor.
如果将空间的位移变成时间的延迟，单个矢量传感器可以实现高分辨率的频率估计。
Maintaining the output character of the system, the voltage space vector control was improved which made the switching frequency decrease 50%.
对空间电压矢量方法进行了改进，在不改变系统输出特性的前提下，使开关频率降低了50%。
The research revealed that telephone has created new modes of interaction and communication, and has changed rural actors 'interaction in terms of space, frequency and targets.
研究发现，电话创造了新的交往和互动方式，使互动空间的形态和范围、互动的频度、互动的对象和互动的强度等都发生了不同程度的变化。
The traditional neural network correction has a good adaptivity to the noise. But with a stronger low frequency space noise, the correction effect is very poor.
传统的神经网络非均匀性校正算法对噪声具有较好的自适应性，但当空间低频噪声较大时，校正效果明显下降。
Therefore, the space charge reduction factor equation based on the sheath helix model is inappropriate at high frequency.
因此，使用螺旋导电面模型在较高频段计算空间电荷降低因子是不合适的。
The results of experiments indicated that the control strategy was correct and effective in suppressing the low frequency and large amplitude vibration of flexible space structures.
实验研究结果表明，该控制方案对空间柔性结构的低频大幅振动有很好的控制效果。
The study shows that the difference of the space charge reduction factor between the sheath model and the perfect conducting tube is small at high frequency.
结果表明，螺旋导电面模型相对理想导电圆筒中的空间电荷降低因子在较高频段变化不大。
The control signals of invertor are produced by space vector modulation to achieve a small torque ripple and constant switch frequency.
以空间矢量调制方法来获得逆变器的开关信号，实现了小的转矩脉动和恒定的开关频率。
There are six grades of space frequency, twelve grades of time frequency, twelve grades of visual field and different showing-time for each patterns.
该装置可以显示水平光栅、垂直光栅和棋格信号，具有六档不同的空间频率、十二档时间频率、十二档视野范围和显示时间控制。
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