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maximum diversity
相关语句
  最大分集
     The MIMO channel model that joints space diversity with Doppler diversity is set up. Based on it, we show that the maximum diversity order is MrMr(L + 1)(Q + 1).
     给出了联合考虑空间分集与Doppler分集的MIMO系统模型,推导出了时变多径衰落信道下系统所能获得的最大分集阶为MrMr(L+1)(Q+1),并提出了利用空时编码、预编码和OFDM技术相结合来提高系统性能的方法。
     The MIMO channel model that joints space diversity with Doppler diversity is set up. Based on it, we show that the maximum diversity order is MtMr(L+1) (Q+1). Then, the scheme which joints OFDM technique in this situation is proposed.
     给出了联合考虑空间分集与Doppler分集的MIMO系统模型,推导出了时变多径衰落信道下系统所能获得的最大分集阶为MtMr(L+1)(Q+1),并提出了利用空时编码、预编码和OFDM技术相结合来提高系统性能的方法。
短句来源
     But as to the diversity gains, STCM and STBC can achieve the maximum diversity that the system provides, while LST only obtains a small part of it because of its limited application.
     但对分集增益而言 ,网格空时码和分组空时码均可达到系统所能提供的最大分集增益 ,而分层空时码由于受实现方式的制约 ,只能得到其中一部分分集增益 .
短句来源
     Simulation shows that this novel system not only acquires maximum diversity gain brought by space-time structure at the full rate, but also improves data transmission rate compared to the traditional frequency domain channel estimation systems of Alamouti space-time block codes associated with OFDM.
     仿真结果表明,这种新系统获得了空时结构所带来的全速率下的最大分集增益, 而且具有比Alamouti空时分组编码与OFDM相结合的频域信道估计系统更高的数据传输率。
     The MIMO channel model that joints space diversity with Doppler diversity is set up. Based on it, we show that the maximum diversity order is ML(Q+1). Then, the coding scheme in this situation is proposed.
     给出了联合空间分集与Doppler分集的多天线发送多天线接收(MIMO)系统模型,推导出了时变衰落信道下系统所能获得的最大分集阶为ML(Q+1),并提出了实现该分集增益的编码方法.
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  “maximum diversity”译为未确定词的双语例句
     The proposed scheme adopts subcarrier grouping and linear precoding, which can guarantee the maximum diversity gain and facilitate the process of encoding and decoding.
     该技术采用子载波分组与线性预编码方案,通过适当的子载波分组,可以保证系统获得最大的分集增益,并使系统编译码的的复杂程度大为降低;
短句来源
     The content of CO_2 in air has a slightly negative correlation to species,the richness index of species and the diversity,maximum diversity and evenness index of community,with the correlation figures of -0.160, -0.263, -0.072,-0.117 and -0.031 respectively,which proves that the content of organic matter in soil and the content of CO_2 in air are the important elements influencing the community variation of cave animals.
     空气中CO2的含量与物种数、物种丰富度指数、群落多样性指数、群落最大多样性指数和群落优势度指数都成不显著负相关,相关系数分别为-0.160、-0.263、-0.072、-0.117和-0.031。 由此证明土壤有机质的含量和空气中CO2的含量是影响洞穴动物群落变化的重要因子。
短句来源
     Now we can conclude that maximum diversity and diversity has the direct relation to the number of the elements.
     因为植被景观系统的最大景观多样性指数、景观多样性指数最小,但受到人类活动的干扰最大;
短句来源
     Theoretical analysis and computer simulation results show that STCDC- O FDM can achieve the maximum diversity (both spatial and multipath diversities) a nd has the advantages of being independent from the number of transmit antennas and having a lower implementation complexity.
     理论分析和计算机仿真结果表明 :该空频编码算法不仅能获得完全分集增益 (包括空间分集和信道多径分集 ) ,而且还具有与发送天线数量无关、计算量小和实现容易等优点
短句来源
  相似匹配句对
     is maximum.
     的影响极大。
短句来源
     (2) maximum of species diversity(H_(max));
     (2)最大多样度(H_(max));
短句来源
     Diversity of the World
     论世界的多样性
短句来源
     Species Diversity
     物种多样性
短句来源
     The diversity and evenness of the Wolf spider subcommunity were maximum in grass land.
     狼蛛更群落多样性和均匀度以草地最高。
短句来源
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  maximum diversity
The maximum diversity problem (MDP) consists of identifying, in a population, a subset of elements, characterized by a set of attributes, that present the most diverse characteristics among the elements of the subset.
      
One of the major goals of rational design of combinatorial libraries is to design libraries with maximum diversity to enhance the potential of finding active compounds in the initial rounds of high-throughput screening programs.
      
Maximum diversity was generally observed in heterogeneous permanent habitats with mixed vegetation structure but hedges are important to produce biomass for predators.
      
The most diverse and representative set of lingonberry specimens was obtained when samples were selected with the Maximum diversity program.
      
Nepalese accessions showed maximum diversity followed by Chinese accessions.
      
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Research results imply that the performance of space-time trellis codes achieving the maximum diversity mainly depends on minimum determinant among all possible differential signal matrix,as well as the appearance probability of this value.An optimization algorithm of STTC(Space-Time Trellis Cods) is proposed in this paper,and some better performance codes are introduced.As the simulation results show,0.3-1dB is improved on those proposed by exhaustive search.

我们研究表明 :在达最大分集增益前提下 ,网格空时码的性能不仅与差矩阵的最小行列式值有关 ,而且还与该最小值的出现概率有关 .本文在此基础之上 ,提出一种基于距离谱的网格空时码优化算法 ,并给出了一些性能更好的网格空时码编码方案 .仿真结果显示 ,本文给出的网格空时码比采用穷搜索算法得到的有 0 3- 1dB的增益 .

Space Time Codes which combined space diversity with time diversity can obtain great higher spectral efficiency than the systems fixed with only one transmit antenna and one receive antenna. In this paper, the coding gains, diversity gains and spectral efficiency of the previous space time codes are analyzed systematically according to the concept of pair wise error probability. As the results show, the spectral efficiency that LST can obtain is greater than that the two other Space Time Codes obtain. But...

Space Time Codes which combined space diversity with time diversity can obtain great higher spectral efficiency than the systems fixed with only one transmit antenna and one receive antenna. In this paper, the coding gains, diversity gains and spectral efficiency of the previous space time codes are analyzed systematically according to the concept of pair wise error probability. As the results show, the spectral efficiency that LST can obtain is greater than that the two other Space Time Codes obtain. But as to the diversity gains, STCM and STBC can achieve the maximum diversity that the system provides, while LST only obtains a small part of it because of its limited application.

空时编码综合了空间分集和时间分集的优点 ,能够获得远大于单天线系统的频带利用率 .从成对错误概率的角度出发 ,详细分析比较了现有 3种空时编码的编码增益和分集增益 ,以及它们与频带利用率之间的关系 ,结果表明 ,分层空时码可以获得的频带利用率远大于其他两种空时码 ;但对分集增益而言 ,网格空时码和分组空时码均可达到系统所能提供的最大分集增益 ,而分层空时码由于受实现方式的制约 ,只能得到其中一部分分集增益 .

Urban greenbelt landscapes, including park, street, road, and courtyard greenbelts, are an important component of urban ecosystems. The study of urban greenbelt landscapes is essential for quantifying and improving the quality a city's environment. In this paper, based on the spatial characteristics of urban greenbelt landscape, an index system and content were put forward for urban greenbelt landscape evaluation. The classification and distribution of urban greenbelt landscape patches, and their spatial characteristics,...

Urban greenbelt landscapes, including park, street, road, and courtyard greenbelts, are an important component of urban ecosystems. The study of urban greenbelt landscapes is essential for quantifying and improving the quality a city's environment. In this paper, based on the spatial characteristics of urban greenbelt landscape, an index system and content were put forward for urban greenbelt landscape evaluation. The classification and distribution of urban greenbelt landscape patches, and their spatial characteristics, in Ningbo City were examined based on GIS and the theory of landscape ecology. Finally, a comprehensive evaluation was conducted for the urban greenbelt landscapes for each of the administrative areas of Ningbo City. ;The results indicate: (1) the urban greenbelt landscape is an important component of an urban ecosystem. An urban greenbelt landscape can consist of four structural elements: patch, corridor, matrix and edge. Urban greenbelt landscapes are characterized by fragmentation, instability, gradient, and patchiness. They are fragmented by other urban landscape structure associated with traffic and energy infrastructure, unstable due to changes from old city rebuilding and new city expansion, characterized by a gradient of increasing green cover from city center to outskirt, and patchy in structure. (2) In urban ecosystems, large patches may be more important in ecological function than small patches. Small patches supplement the large ones in function. Urban greenbelt patches were divided into four size groups: small patches (<500m 2 in area), medium (500~3000m 2), medium-large size patches (3000~10000m 2) and large size patches (>10000m 2). Small and medium size patches covered 28^40% and 35^61% of the areas in the urban greenbelt landscape, respectively. They were affinitive to the inhabitation in the city and consisted of domestic greenbelt, street greenbelt in residential areas and along roads. The medium-large and large patches constituted 0^75% of the patches but 1/3 of the urban greenbelt landscape. They mostly belonged to public greenbelt park, zoo, hotel, enterprise, and institutions. (3) The landscape diversity was 0^717 (maximum diversity=1^386). The diversity of Jiangdong and Haishu district (0^907 and 0^816) was higher than Jiangbei district (0^295) and the dominance of Jiangbei district was the highest among the three administrative areas, which indicates one kind of greenbelt type was preponderant in this district, and the greenbelt types of Jiangdong and Haishu district was comparatively proportional. The evenness for the city was low (0^629), which indicated the landscape types were not even in abundance and the whole ecosystem was controlled by the few greenbelt landscape types. The landscape fragmentation was 0^292 for the city as a whole. It was 0^383 and 0^652 in Jiangdong and Haishu district where the building speed was high. The fragmentation in Jiangbei district was small because its speed of city building is slower than the other districts. The total isolation in Jiangbei district was the highest in the city (2^636), indicating that greenbelts were relatively concentrated; it was smaller in Jiangdong and Haishu districts (1^209 and 0^778). The greenbelt line corridor density was 2^237km/km 2 in Ningbo City. The greenbelt line corridor density in Haishu district was greater than those in Jiangdong and Jiangbei districts, as the road density in old urban areas was greater than those in new urban areas. The fractal dimension was small for the city as a whole (1^373), indicating the planning principle for city development and building was linier. (4) Fuzzy comprehensive assessment method was used to evaluate greenbelt landscape with indices of urban greenbelt landscape structure and green overlay; the results indicates that the spatial structure of the greenbelt landscape in Ningbo City was good, and the greenbelt landscape in Jiangdong district has the most desirable and that in the Jiangbei district has the least desirable structure. (5) The urban greenbelt landscape no

城市绿地景观的空间结构分析是城市景观生态系统研究的重要内容和基本特色之一。分析了城市绿地景观生态系统的空间结构元素及其特征 ,运用景观生态学的原理 ,在 GIS支持下对宁波市城市绿地景观缀块的等级与分布、空间结构的度量进行了研究和分析 ,并对该市的城市绿地景观按行政单元进行了综合评价。研究结果表明 ,宁波市城市绿地缀块个数以面积小于 5 0 0 m2 的小型缀块为主 (95 .3 2 % ) ,而缀块面积大于 3 0 0 0 m2 的大中型和大型缀块虽然个数较少 (仅 0 .75 % ) ,却是构成该市城市绿地景观的主体 (面积占3 5 .99% )。宁波市城市绿地景观多样性指数为 0 .71 7,均匀度为 0 .6 2 9,景观优势度为 0 .6 6 9,聚集度为0 .870 ,破碎度为 0 .2 92 ,总分离度为 1 .45 6 ,绿地廊道密度为 2 .2 3 7,分维数为 1 .3 73。城市绿地景观总体表现为类型分布不均 ,各种类型相差较大 ,破碎度较小 ,多样性程度不高。综合评价结果为江东区最佳 ,景观结构最为合理 ,海曙区次之 ,江北区较差 ,全市总体上较好。研究结果为宁波市城市绿地景观生态系统...

城市绿地景观的空间结构分析是城市景观生态系统研究的重要内容和基本特色之一。分析了城市绿地景观生态系统的空间结构元素及其特征 ,运用景观生态学的原理 ,在 GIS支持下对宁波市城市绿地景观缀块的等级与分布、空间结构的度量进行了研究和分析 ,并对该市的城市绿地景观按行政单元进行了综合评价。研究结果表明 ,宁波市城市绿地缀块个数以面积小于 5 0 0 m2 的小型缀块为主 (95 .3 2 % ) ,而缀块面积大于 3 0 0 0 m2 的大中型和大型缀块虽然个数较少 (仅 0 .75 % ) ,却是构成该市城市绿地景观的主体 (面积占3 5 .99% )。宁波市城市绿地景观多样性指数为 0 .71 7,均匀度为 0 .6 2 9,景观优势度为 0 .6 6 9,聚集度为0 .870 ,破碎度为 0 .2 92 ,总分离度为 1 .45 6 ,绿地廊道密度为 2 .2 3 7,分维数为 1 .3 73。城市绿地景观总体表现为类型分布不均 ,各种类型相差较大 ,破碎度较小 ,多样性程度不高。综合评价结果为江东区最佳 ,景观结构最为合理 ,海曙区次之 ,江北区较差 ,全市总体上较好。研究结果为宁波市城市绿地景观生态系统的规划、设计提供了生态学依据 ,为“生态园林城市”建设提供了理论依据

 
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