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diversity method
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     In addition,the energy center method can be applied to the data compressed by Dechirp. The wavelength diversity method will be invalid for this case because of the fact that LFM signal will be transferred into single frequency pulse signal after Dechirp compression.
     能量重心法同样适用于经过Dechirp压缩处理后的数据 ,但此时波长差异法不再适用 ,因为线性调频信号经过Dechirp脉压后将变成单频脉冲信号。
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  “diversity method”译为未确定词的双语例句
     Wavefront sensing using phase diversity method
     基于相位差法的波前检测技术
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     As an effective transmitter diversity method over frequency selectie fading channel, space frequency-orthogonal frequency division multiplexing (SF-OFDM) has got more attention to it.
     在频率选择性衰落环境下,作为一种有效的传输分集体制,空频 正交频分复用(spacefrequency orthogonalfrequencydivisionmultiplexing,SF OFDM)技术得到了广泛的关注。
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     This technique takes advantage of spatial independence of target and jammer,uses coarray with frequency diversity method,increases the spatial resolution more than one time,and decreases the number of grating lobes greatly.
     该方法利用目标和干扰源的空间独立性,通过对编队构形优化,结合频率分集,实现了抗干扰功能,且方向分辨率提高1倍以上,栅瓣数目大为减少。
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     Under exploiting MIMO-OFDM communication system spatial signal resources, diversity algorithms based on one preamble symbol for MIMO-OFDM frame and symbol timing synchronization are presented in this paper. The diversity method overcome hurdle in timing synchronization performance decline on high speed wireless multipath channel deep fading. The detail diversity algorithms aiming for frame and symbol timing synchronization are described.
     应用MIMO-OFDM无线通信系统的空间信号资源,提出了基于单个前导符号的MIMO-OFDM系统帧定时和符号定时同步的分集算法,以克服高速无线多径信道中深衰落对MIMO-OFDM系统定时同步性能的影响,给出了具体的帧定时、符号定时同步的分集算法以及在高速无线多径信道COST207模型下帧定时和符号定时同步的仿真结果。
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  相似匹配句对
     Diversity of the teaching method;
     教学方法的多样性;
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     Method
     材料和方法
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     Method. u.
     方法:利用紫外分光光度法和溶解度法。
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     THE JACKKNIFING METHOD FOR ESTIMATING THE INDEX OF DIVERSITY
     用刀切法估计多样性指数
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     Diversity in the Bibliometrics
     文献计量学的歧议
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  diversity method
In this paper we present an enhanced transmission diversity method to solve the problem of high correlation among channels.
      
The P, C, and L strategies were used and combined with eitherrandom selection within the group or the Relative Diversity method.Two samples of 90 accessions were obtained at random withoutconsidering the classification.
      
The DIVERSITY method was developed and tested for statewide use in Kentucky, but we believe it is also practical and applicable for use in almost any other area.
      
We also see that the second path diversity method provides consistently good speech quality compared to the MD method.
      
This diversity method works only in combination with channel coding when using the same receiver structure as in the one antenna case.
      
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Time-frequency code is a code that L frequencies are filled in N-time-chip according to error-correction coding principles. Each N-time-chip is a codeword corresponding to one of 2~m messages with m binary digits. The N-time-chip blocks as N L-ary digits codewords have the longest possible code distance. If L channels using L frequencies are independent from each other, each digit of the codewords is almost independent. At the receiver the processing is equivalent to comparing the recived sequence with sequence...

Time-frequency code is a code that L frequencies are filled in N-time-chip according to error-correction coding principles. Each N-time-chip is a codeword corresponding to one of 2~m messages with m binary digits. The N-time-chip blocks as N L-ary digits codewords have the longest possible code distance. If L channels using L frequencies are independent from each other, each digit of the codewords is almost independent. At the receiver the processing is equivalent to comparing the recived sequence with sequence of each known codeword using error-correction coding principles, so that the ability of error-correction code can be fully utilized. This diversity method using time-frequency code is known as time-frequency coding diversity. It is an important method of constructing troposcatter communication systems. Considerations of its parameter selection, the method of its generation matrix formulation, and the coding method are discussed in this paper. Some results of the coding scheme are given in the appendix,

时频编码分集是对流层散射通信的一种重要体制。本文讨论了参数选择的原则和生成矩阵的求法,从而导出了通用的编码方法,得出了几种实际的編码方案,并用计算机算出了这些方案的全部码组。

Simple close form expressions for different diversity methods′ theoretical performance are derived in this paper under the assumption of perfect channel estimation.When channel estimation error should be considered,we can simply substitute the original E s/N o in each expression with a new effective value.Simulation results validate the correction of this method.Based on the performance bounds determined by these new expressions,we study the performance of the two closed loop modes with different...

Simple close form expressions for different diversity methods′ theoretical performance are derived in this paper under the assumption of perfect channel estimation.When channel estimation error should be considered,we can simply substitute the original E s/N o in each expression with a new effective value.Simulation results validate the correction of this method.Based on the performance bounds determined by these new expressions,we study the performance of the two closed loop modes with different Doppler frequency and different processing methods at the UE (user equipment).

本文推导了有精确信道估计时 ,各种常见分集方法在平坦瑞利衰落信道中的理论性能 ,通过对有效信噪比的简单替换我们将这些结论推广到考虑实际信道估计误差的情况 ,仿真结果验证了这些公式的正确性 .据此我们可得到两种闭环发分集模式的理论性能界 ,以此为参考和目标我们研究了两种闭环分集模式在不同Doppler频率和不同预测处理方式下的实际性能

Calycanthaceae is a small family with 4 genera and 10 species. In the present paper, a cladistic analysis is made using the methods of Maximal Same Steps, Minimal Parallel Evolution and Synthetic Maximal Diversity Method developed by Xu. According to the cladistic analysis, it is suggested that Chimonanthus may be an earliest branch from pre-Calycanthaceae, which almost retains all primitive characters of the ancestor, while Sinocalycanthus is closely related to Calycanthus. Both Sinocalycanthus...

Calycanthaceae is a small family with 4 genera and 10 species. In the present paper, a cladistic analysis is made using the methods of Maximal Same Steps, Minimal Parallel Evolution and Synthetic Maximal Diversity Method developed by Xu. According to the cladistic analysis, it is suggested that Chimonanthus may be an earliest branch from pre-Calycanthaceae, which almost retains all primitive characters of the ancestor, while Sinocalycanthus is closely related to Calycanthus. Both Sinocalycanthus and Calycanthus are of transit genera from primitive to advanced taxa in the Calycanthaceae, and Idiospermum is the most advanced in the family.

蜡梅科是一个仅有4属,10种的小科,将蜡梅科的生物信息数字化,利用徐克学的和谐性分析程序,剔除了不合理的性状安排,判别关系含糊的性状极性,利用最大同步法,最小平行演化法及最大离散量分支分类法,对由性状再分析后获得的数值矩阵进行运算,推导分支图,明确各属之间的发生、发展和演化的关系。结果表明:椅子树亚科(Idiospermoideae)的椅子树属(Idiospermum Blake)在整个蜡梅科(Calycanthaceae)的演化水平中是最高的,它的进化性状最多,同时它与蜡梅亚科(Calycanthoideae)的其它三个属很早就按照各自的方向平行演化了,蜡梅亚科的蜡梅属(ChimonanthusLindley)表现的属性最原始,它是从蜡梅科的祖先中分离出的最早类群,随后夏蜡梅属(Sinocalycanthus Cheng & S.Y.Chang)与美国蜡梅属(Calycanthus L.)从蜡梅科祖先中相继分离出来,这两个属的亲缘关系最近,拥有许多共同的性状.

 
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