frequency diversity

The results showed that parameters Index of Diversity(ⅰ), Variance of Phenotypic Frequency ( VPF), Variance of Phenotypic Value ( VPV) and Coefficient of Variation ( CV) are more effective on evaluating different methods for core collection selection among 8 studied parameters.

结果表明，在所选8个参数中，多样性指数、表型方差、表型频率方差及变异系数为对比不同核心种质取样方法间优劣的有效参数；

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Multiple Input Multiple Output ( MIMO) antenna is a typical spatial diversity technique, by combining multiple antennas space-time block coding with orthogonal frequency division multiplexing ( OFDM) forming space-frequency block coding, In multipath channel fading conditions, which also can get additional frequency diversity gain.

多输入多输出天线既是一种空间分集技术，将多天线中的空时分组编码与正交频分复用技术相结合构成空频分组编码，在多径衰落信道条件下还可以获得额外多径分集增益。

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Certain Topics on Time-Frequency Coded Diversity Techniques

时频编码分集技术中的几个问题

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Frequency Diversity to Suppress Glint in Wide-Band MMW Radar

频率分集技术对宽带毫米波雷达目标角闪烁的抑制

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Space or multi-antenna diversity techniques are particularly attractive as they can be readily combined with other forms of diversity, e.g., time and frequency diversity, and still offer dramatic performance gains under these bases.

空间或多天线分集技术由于可以与其它如时间分集，频率分集技术相结合，并在其基础上提供很大的性能增益，而成为一种很有吸引力的技术。

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A Synchronizing System in 4-time 4-frequency Coded Diversity Receiver

四时四频编码分集接收的同步系统

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On the basis of existing space-time block code, frequency diversity is studied and a new space-time-frequency code is further designed and applied in the OFDM system, which encodes information in spatial, temporal and frequency domain.

在现有的空时分组码的基础上，研究频率分集进一步发展设计了新的在空间、时间、频率域上三维编码的空时频码，并将其应用于OFDM系统中。

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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 research on OFDM spectrum sensing algorithm utilizes only the time diversity and frequency diversity to improve detection performance without utilizing spatial diversity.

目前针对OFDM信号的频谱感知算法研究只利用时域分集和频域分集提升检测性能，而没有考虑利用空间分集提升检测性能。

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This provided advance study and brought forward the high removes resolution and frequency diversity.

提出用高分辨率和频率分集解决多径效应问题.

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Analysis and Performance of Multicarrier Frequency Diversity Spread Spectrum Code Division Multiple Access Communication System

多载波频率分集扩展频谱码分多址通信系统及性能分析

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It can obtain time diversity, spatial diversity and frequency diversity at the same time. So it not only can effectively combat the frequency selective fading in the course of spread, but also the spectrum efficiency is greatly improved.

它将时间分集、空间分集和频率分集有机地结合起来，不仅可以有效地抵抗信号传播过程中遭遇的频率选择性衰落，而且频谱利用率得到很大地提高。

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The combination of these two technologies makes good use of space diversity, frequency diversity and time diversity to improve the system capacity and the ability of anti-interference.

两者的结合充分利用了空间分集、频率分集和时间分集来改善系统的容量和抗噪声性能。

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Moreover the combined performance of frequency diversity and time diversity can be gained by using time-frequency RAKE receiver.

接收端使用时频RAKE接收机，可以使系统具有频偏分集和时延分集的性能。

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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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A frequency-based matrix diversity strategy is applied in the traditional Genetic Algorithm.

在传统的遗传算法中,引入一种基于频率矩阵的种群多样性策略.

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