space diversity 中文意思是什麼

space diversity 解釋
空間分集
  • space : n 1 空間；太空。2 空隙，空地；場地；（火車輪船飛機中的）座位；餘地；篇幅。3 空白；間隔；距離。4 ...
  • diversity : n. 1. 不同，異樣，差異。2. 繁多，多種，多樣，駁雜，參差。
  1. Stbc ( space time block code ) is the main method to realize mimo diversity, and it is good at mitigating the influence of wireless multipath fading

    而stbc （ spacetimeblockcode ，空時分組碼）則是實現mimo分集的重要手段，長于對抗通道的多徑衰落。
  2. The characters of this antenna lie in three points : using yagi - uda antenna to obtain antenna gain through the radial direction ; making full use of the space of the base station along the z - axis direction to get array gain ; arranging the antenna array properly to achieve pattern diversity in azimuth plane

    其特點集中體現在三個方面:在天線徑向通過八木天線的形式獲得增益;充分利用基站空間在z向組成陣列獲取陣列增益;利用開關八木天線方向圖可重構的特性，通過合理的布局，在方位面內實現角度分集。
  3. The theoretical analysis shows that any human activities, responsible for the changes of rock, air, water, soil and biology inside or outside the caves, will influence inevitably cave animals in terms of such levels as molecule, cell organelle, cell, tissue, organ, system, individual, population, society and ecosystem. these effects can be observed on cave animal ' s shape - building, activity, tissue structure, metabolism, space - time distribution, biothythm, structure of population and society, food chain, bio - relation, diversity of population and society, and function of the above - mentioned levels

    理論分析表明，凡是能夠引起地表和洞穴巖石、空氣、水、土壤、生物等變化的一切人類活動都不可避免地使洞穴動物在分子、細胞器、細胞、組織、器官、系統、個體、種群、群落和生態系統各級層次上產生效應，這些效應具體表現在影響洞穴動物形態建成、行為、組織結構、新陳代謝、時空分佈、生物節律、種群和群落結構、食物鏈結構、生物關系、種群和群落多樣性以及各層次所表現的功能的多少、快慢、強弱等方面。
  4. Configuration space against the defects of product family model is constructed for targeting diversity of customer needs and conjoint analysis is applied to decompose the customer preference into the utility of different product attributes

    該方法針對現有產品族模型用於配置設計中存在的問題，構造了支持產品配置的設計空間，並運用聯合分析方法將顧客期望分解為各產品特性的質量效用。
  5. In the genetic process of reproduction, crossover and mutation of the chromosomes in this method, these operators pr, pc and pm are produced randomly within some space, the scale of population and all kinds of genetic probability are also adjusted randomly so that the diversity individuals of population is ensured. the ga of dynamic population scale passes more information of paternal chromosomes to the offspring, which is beneficial to search the global optimization or quasi - global optimization

    該方法在染色體進行繁殖、交叉、突變的遺傳過程中，在某一范圍內隨機選取p _ r ， p _ c ， p _ m ，動態調整種群規模，保證了種群個體的多樣性；選擇同父本分別進行三種遺傳過程使得父本染色體中有更多的信息傳遞給子代，這有利於搜索全域最優解或準最優解。
  6. The analysis of the performance and its comparison to space time transmit diversity ( sttd ) are presented in this chapter. the link level simulations are performed. finally we discuss the effects of feedback delay and feedback error on the performance

    第五章首先介紹了閉環發送分集的原理；接著對其性能進行了仔細的分析，完成了鏈路級模擬，並與開環發送分集進行了對比；最後討論了反饋延遲、錯誤對性能的影響。
  7. Space - time codes can be divided into tree mainly parts : bell layered space - time architecture ( blast ), space - time trellis codes ( sttc ) and space - time block codes ( stbc ). in this paper, we mainly compare the performance of blast and stbc in many aspects, such as design criterion, transmission rate, diversity gain, diversity combining, bit error rate and channel capacity etc. in this paper, we first respectively analysed the instantaneous received symbol energy - to - noise ratio of v _ blast in the diversity combining methods of maximal ratio combining ( mrc ), equal gain combing ( egc ) and selective combing ( sc )

    Mimo技術核心是空時編碼（ stc ） 。空時編碼主要分為三種:分層空時碼（ blast ） 、空時格碼（ sttc ）和空時塊碼（ stbc ） 。本文主要對分層空時碼和空時塊碼這兩種編碼方式在設計準則、傳輸速率、分集增益、接收合併、比特差錯率和通道容量等方面進行了較為詳盡的研究。
  8. The results indicated that as the intensity of sward cleavage increased, elymus nutans and other plants that had high requirements in soil aeration and resource space presented an increased competitive edge and the species that had low requirements in soil aeration and resource space presented an opposite picture ; low - intensity sward cleavage could help increase species diversity to a certain extent, but the diversity index appeared to decline as a whole as the cleavage intensity increased ; the effects of sward cleavage on functional groups of the vegetations showed in such manner as e. nutans - represented grasses increased in their composition with the intensity of sward cleavage raised, and sedges and forbs decreased in their compositions with the intensity of sward cleavage raised ; sward cleavage showed a significant improving effect on primary productivity of the meadows and was capable of increasing the proportion of quality - grass biomass to the total plant biomass ; sward cleavage could be independently employed as an effective measure to rehabilitate and improve alpine - meadow grasslands and thus played a basic and key role in the technical combination aiming at establishing hay fields characterized by e. nutans

    結果表明：垂穗披堿草等對土壤通透性和資源空間要求較高的物種，競爭力隨劃破強度的增加而上升，而對土壤通透性和資源空間要求相對較低的物種則相反；輕度劃破干擾對提高物種豐富度具有一定的促進作用，但多樣性指數則總體上表現為隨劃破強度的增加而呈下降的趨勢；劃破干擾對植被功能群的影響表現為以垂穗披堿草為代表的禾草類組分隨干擾強度的增加而顯著上升，莎草類和雜類草組分隨干擾強度的增加而顯著下降；劃破干擾對草地初級生產力的提升具有顯著的促進作用，且可顯著增加植物總量中優質牧草的比重；劃破干擾可獨立作為高寒草甸類草地恢復與改良的有效措施，在定向培育垂穗披堿草型割草場的技術組合中具有核心和基礎性的地位。
  9. Comparing with the system which does not space - time code, space - time coding can obtain transmit diversity and increase channel capacity without frequency bandwidth loss

    與空間未編碼系統相比，空時編碼可以在不犧牲帶寬的情況下起到發射分集和提高功率增益的作用。
  10. However, in practical systems, the deployment of antenna array is difficult due to the size and / or price limitation. recently a new form of space diversity, which is based on relay channel model and through users ’ help for each other, named cooperative diversity has become an atructive technology

    但是由於尺寸，能量，價格等因素限制，在移動終端使用多根天線具有一定的困難，最近一種基於中繼通道模型的，同時利用多個用戶的互相協助而實現空間分集的技術? ?協同分集技術，成為一個新的研究熱點。
  11. Because of the affection of noise and signal fading, in order to high data rate access and high quality, wireless communication need new technology to improve the link reliability and enhance the spectrum efficiency. mimo ( multiple input and multiple output ) can enhance the spectrum efficiency and increase channel capacity greatly, and reduce the multipath affection without spectrum band and power increasing. the 3th generation mobile communication wcdma is coming, with the purpose of putting mimo, stbc ( space time block coding ), space diversity into practice of wcdma systems, in order to lay the foundation of 3g toward 4g, this dissertation has done some research under this background

    在發射機和接收機使用多個天線進行數據傳輸的多輸入多輸出（ mimo ）技術，可以在不增加帶寬和天線發送功率的條件下，成倍的提高頻譜利用率，提高系統的通道容量，還可以抗多徑干擾。第三代移動通信wcdma即將到來，為了將多天線技術（ mimo ） ，空間分集技術，空時編碼技術用到wcdma系統中去，為第三代移動通信向第四代移動通信系統平穩過渡奠定一定的基礎，需要做一些理論上的研究。
  12. A joint frequency and space diversity scheme is presented which can reduce computational cost. 3. an adaptive bit, power and subcarrier allocation is presented

    分集技術，重點介紹了一種空間頻率聯合分集接收技術，它能夠大幅度降低計算量； 3
  13. Among the non - coherent transmit diversity technologies, differential transmit diversity is a remarkable technique. in this thesis we consider the combining diversity of the differential transmit diversity and receive diversity. the potential of space diversity was discussed and the error performance of combining diversity system was investigated

    本論文採用聯合分集的方式將差分發送分集技術與接收分集技術相結合，進一步探討了空間分集在抗衰落方面的潛力，並對基於聯合分集技術的多天線通信系統進行了研究。
  14. Spatial multiplexing and space diversity gain of a system can be extracted through mimo technique

    多輸入多輸出（ mimo ）技術可以為系統提供空間復用增益和空間分集增益。
  15. The fourth part considered how to improve system performance by adopting transmission diversity in flat fading channels. in the traditional space - time trellis code design, the space diversity, time diversity and channel code are concerned together to get best space diversity, time diversity and code gain

    傳統的空時格碼把空間分集、時間分集和前向糾錯編碼聯合設計，以n摘要獲得最大的空間分集、時間分集、通道編碼的增益。
  16. And diversity is a technique of extensive use and maturation, a technique of more inexpensive investment with more improvement in wireless communication. the common diversity be classified as space diversity, polarization diversity, frequency diversity, and time diversity etc. this paper focus on implement of space diversity and polarization diversity in digital field

    無線傳輸在自然界中存在大量不相關的多徑信號，分集技術是通信中的一種廣泛應用的、成熟的技術，一種用相對較低廉的投資就可以大幅度的改進無線鏈路性能的強有力的接收技術。
  17. One of the convertion technologies of space diversity is antenna array, which is researched and ultilized in 3g and beyond 3g system

    空間分集技術的一種傳統的應用技術是通過多天線或天線陣列實現，並在3g ， beyond3g等系統中得到研究和應用。
  18. Among the effective methods to mitigate the fading in wireless communications is transmit diversity, which can utilize the space diversity of transmit antennae to generate the receive diversity and improve the performance of the forward link

    發送分集技術是對抗無線通道衰落的重要手段，它能將發送天線的空間分集轉化為接收機可以利用的分集方式，以改善前向鏈路的性能。
  19. In this part, the two anterior chapters mainly discuss the various basic theories used by the designing for the propagation paths of the electric wave. the theories include the computation methods for the fade and the loss of various propagation paths and obstructions, the engineering estimation methods of the flat fading and frequency selected fading, the designing methods of space diversity and frequency diversity, etc. at the same time, the special designing method of the sea - across path is discussed in detail

    本文首先闡述了微波中繼通信工程設計中的相關知識，其中前兩章主要論述了線路設計中所用到的種種理論基礎知識，包括對于各種路徑情況、障礙情況的衰落與損耗的不同計算方法，平衰落與選擇性衰落中斷率的估算方法，天線分集和頻率分集技術的理論知識和設計方法等等。
  20. Firstly, we introduce the principles of turbo codes and present the simulation results and performance analysis. secondly, considering some factors on which performance depends, we give some design criterias of turbo codes. finally, in consideration of characteristics of mobile channel, we investigate the combination of turbo coding technique and space diversity technique, namely, space time turbo coding ( sttuc ) technique

    本文緊密圍繞turbo編碼技術，首先介紹turbo碼的基本思想和原理，同時給出了turbo碼的性能模擬及分析；然後結合turbo的性能要求，給出提高編碼性能的一些設計準則；最後結合移動通道的特點，詳細的討論了具有空間分集的turbo編碼技術? ?空時turbo編碼（ sttuc ）技術。
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