空時發射分集 的英文怎麼說

中文拼音 [kōngshífāshèfēnjí]
空時發射分集 英文
sttd space time transmit diversity
  • 空 : 空Ⅰ形容詞（不包含什麼; 裏面沒有東西或沒有內容; 不切實際的） empty; hollow; void Ⅱ名詞1 （天空） s...
  • 時 : shí］Ⅰ名1 （比較長的一段時間）time; times; days:當時at that time; in those days; 古時 ancient tim...
  • 發 : 名詞（頭發） hair
  • 射 : Ⅰ動詞1 （用推力或彈力送出） shoot; fire 2 （液體受到壓力迅速擠出） discharge in a jet 3 （放出） ...
  • 分 : 分Ⅰ名詞1. （成分） component 2. （職責和權利的限度） what is within one's duty or rights Ⅱ同 「份」Ⅲ動詞[書面語] （料想） judge
  • 集 : gatherassemblecollect
  1. Barrier cracks cannot stop the extending of a fracture, and the strength of the sample is reduced by almost one magnitude because of the existing barrier cracks. there are great differences of ae distribution between specimens with non - penetrate crack and specimens with penetrate crack. as for penetrate crack, ae occurs near the two end of the crack, and for non - penetrate crack, crack, ae occurs near the two end of the crack, and for non - penetrate crack, ae occurs near the front edge of crack, which can be explained well by the theory of 3 - d fracture ; ae distribution near the outer part of collinear crack is similar with that of the end of penetrate crack, and inner part of collinear cracks will run - through with high loads

    關于預制裂紋系對巖石破裂的影響，集中討論了：空障礙體構造不能阻止主裂紋的擴展，反而會使巖石的破裂強度降低近一個量級；由於構造的不同，非穿透切口樣品和穿透切口樣品的聲發射空間分佈特點有本質區別，穿透切口樣品的微破裂在切口兩端發育，而非穿透切口樣品的微破裂在切口兩端之間切口前緣處發育，這用三維破裂理論可以很好地解釋；含共線構造的巖石，裂紋外端的聲發射分佈與單裂紋構造中裂紋端部的聲發射分佈相似，裂紋內端聲發射有密集分佈，在應力達到一定水平時，內端部發生錯斷，而不是貫通。
  2. 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。
  3. At the same time, to achieve space, time and frequency diversity, some research is done on stf technology, which joints transmit diversity and ofdm technology

    同時對發射分集技術和ofdm相結合，通過適當的編碼技術來獲得空、時、頻分集的空時頻編碼技術進行了一定的研究。
  4. The data acquisition of the pet has several kind of mode. there are deferent mode divided by deferent standard. there are empty scan, trans - scan and emission scan. the emission scan could be divided into 2d and 3d by space and be divided into static scan, dynamic scan, gated scan and whole body scan

    Pet的數據採集有很多種工作方式，從不同的角度有不同的劃分方法，例如我們從臨床角度將採集模式分為：空白掃描、透射掃描和發射掃描。發射掃描又可從空間上分為2d和3d方式；從時間上分為靜態掃描，動態和門控採集，此外還有全身採集。
  5. The newly developing transmit diversity and space - time codes are just one of the most important schemes to improve wireless spectrum efficiency

    而近年來提出的發射分集和空時碼就是能夠有效提高無線頻譜利用率最重要的方案之一。
  6. Space - time coding for transmitting diversity

    發射分集中的空時編碼技術
  7. The bigger the diameter, the high the heat efficiency, but the weak the temperature increasing ability, length has less effect on the heat efficiency, tilt angle has less effect on the flow field and temperature field while it is larger than 30 degree, vacuum degree and emissivity have great effect on the flow field and temperature field while there is a great temperature difference between the liquid in the tube and the surroundings, the furring has less effect on the heat transfer but should be cleaned up in 3 - 5 years because of poor water quality, the higher the solar flux or the more the temperature difference between the liquid and the surrounding, the more the heat loss and the lower the heat efficiency

    分析了各種因素對太陽能真空集熱管流場和溫度場的影響。直徑越大，熱效率越高，但升溫能力弱；長度對熱效率影響不大；傾斜角度大於30后，自然對流已經能夠充分進行，考慮以能夠吸收到最大太陽輻射為主；真空度和發射率對熱效率和溫度場影響很大，尤其是在介質溫度與環境溫度差異比較大時；水垢對傳熱影響較小但由於水質的問題應該被3 5年清洗一次；太陽輻射強度越大，介質溫度與環境溫度差異越大，熱損失越大，效率越低； 4
  8. In respect of direct radiation in air and from the ground, real - time measurements are undertaken by 10 fixed stations of the radiation monitoring network ( figure 1 ) which send data back to hko every minute. the air is also sampled at these sites to cover the inhalation pathway. to enable early response, an automatic gamma spectrometry system at ping chau, the station closest to daya bay, continuously samples the air, carries out measurements and transmits the results to hko, all automatically

    該網路由十個固定監測站所組成，不停地測量香港境內空氣及土壤中放射性物質的直接照射，並每分鐘實時把測量結果傳回天文臺總部。此外，每個監測站亦會抽取空氣樣本，監測呼吸途徑中放射性物質。為了在發生事故時能盡快作出應變，天文臺在香港最接近大亞灣的平洲設立了一套自動伽馬譜法系統，不停地收集空氣樣本，作實時實地的輻射測量，並將測量結果全自動地傳送回天文臺。
  9. 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。
  10. Space - time block coding is a new technique that combines coding, modulation and transmit diversity. it has been an ideal candidate for improving wireless communication performance and increasing data rates in systems with bandwidth constraints

    空時分組編碼是將編碼、調制和發射分集技術結合起來的一種新興技術，它是改善無線通信性能、提高帶限系統數據速率的一種理想的選擇。
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