譜帶擴展 的英文怎麼說

中文拼音 [pǔdàikuòzhǎn]
譜帶擴展 英文
band spreading
  • 譜 : Ⅰ名詞[書面語]1 （按類別或系統編成的書或冊子等） table; chart; register 2 （指導練習的格式或圖形）...
  • 擴 : 動詞（擴大） expand; enlarge; extend
  1. When signals pass high power amplifier, they would be distorted in amplitude and phase, leading to spectrum spread and distortion of in - band signals, both of which would weaken performance of the whole system in turn

    在無線通信中，信號在通過高功率放大器時會產生幅度和相位失真，造成頻譜擴展以及帶內信號畸變，導致整個系統性能的降低。
  2. By theory and practice simulation, the several types of constant envelope modulation techniques are analyzed and compared, including theirs modulation principle, phase path, the modulated wave envelope, power spectrums, error bit rate and the influence of its power spectrums of the band - limited and non - linear, etc. especially we have researched the ijf - oqpsk modulation technique, and the performance of its inter - symbol interference and time jitter free, and its strongly resisting of spectral spreading

    結合理論和實驗模擬結果，分析討論了衛星通信中的各種恆包絡調制技術，對它們的調制原理，相位路徑，已調波包絡，功率譜密度，誤碼性能，以及帶限非線性通道對其功率譜的影響等方面都作了研究和比較。特別研究了ijf ? oqpsk在消除碼間干擾和定時抖動方面的性能及其優良的旁瓣特性和抑制頻譜擴展特性。
  3. From the research of ijf - oqpsk, we draw the conclusion that, compared with bpsk, qpsk and msk modems, in the band - limited and non - linear channel, it has nearly constant envelope, less spectral spreading, better pe performance and the less interference of the adjacent channel, et. so, it is more suitable for the satellite communication channel

    通過對ijf ? oqpsk的分析研究可知，它相對于傳統的bpsk和qpsk調制方式，在帶限非線性通道下，具有包絡近似恆定，頻譜擴展小， eb no惡化小，對鄰道產生干擾弱等優點，因而它更適合於衛星通道。
  4. In the second chapter, a wideband mimo channel model with multiple - tap was integrated according to the angle of departure of the transmitting signal and its spread angle, the angle of arrival of the receiving signal and its spread angle, power azimuth spectra, doppler spectrum and the geometric construction of antenna array both sides of transmit and receive, on the basis of full research on the theories of space - time channel model proposed in the recent literature

    第二章在對最近文獻中提出的一些空時通道模型理論進行詳細研究的基礎上，根據發射信號的離開角及其擴展角、接收信號的到達角及其擴展角、功率方位譜、多普勒譜和收發兩端天線的拓撲結構，綜合了一個多抽頭的寬帶mimo通道模型。
  5. Enhanced variable rate codec speech service option 3 for wideband spread spectrum digital systems

    寬帶頻譜擴展數字系統用增強的可變率編譯碼器語音服務選擇3
  6. Evrc 3 software distribution for tia - 127 - a - enhanced variable rate codec speech service option 3 for wideband spread spectrum digital systems

    Tia - 127 - a的軟體配置.寬帶頻譜擴展數字系統用增強的可變率編譯碼器
  7. Rapd ( random amplified polymorphic dna ), which bases on the polymerase chain reaction ( pcr ), is by far one of the most commonly molecular techniques to uncover dna sequence polymorphisms. the basic priciple of this technique is that an arbitrary primer ( usually lobp oligonudetide ) is used to amplify random segments of dna, and a small number of fragments will be amplified when the primer anneals on each strand over a length range. if sequence variation is present at the priming site, then a fragment may not be amplied, so the dna polymorphic can be detected

    Rapd （隨機擴增多態性dna ）技術是二十世紀90年代發展起來的一項dna分子多態性檢測技術，它建立於聚合酶鏈式反應（ pcr ）技術基礎之上，利用隨機合成的寡聚核苷酸序列為引物（一般為10個bp ） ，分別與dna的兩條單鏈結合，在dna聚合酶的作用下，對基因組的特定區域進行pcr擴增，其電泳結果為不同大小和數目的dna譜帶即rapd圖譜，可反映基因組相應區域的dna多態性。
  8. According to the current problems such as low quantum efficiency. limited available sun energy spectrum range, and inefficient recovery, resulted from the practical using of photocatalysis, using the narrowband semiconductor cds ( eg = 2. 5ev ) to compound with tio2 seems to be an effective solution. since it will not only enlarge the region of the absorption with the proper narrow band of cds but also improve the photodegradation efficiency on account of the band overlap of the two, which makes the photo induced electron and holes separate more easily

    本文針對光催化技術應用中存在的tio _ 2光催化量子效率低，吸收利用太陽能光譜范圍有限，催化劑回收困難等問題，通過窄禁帶半導體cds （ e = 2 . 5ev ）的復合，對納米tio _ 2進行了改性研究，一方面，由於cds的窄禁帶寬度可以擴展薄膜的光譜吸收范圍，另一方面，由於能帶的交疊，提高了光生電子和空穴的分離效率，從而提高了薄膜的光催化降解效率。
  9. High rate speech service option 17 for widebande spread spectrum communications systems

    寬帶頻譜擴展通信系統用高速語音服務選擇17
  10. Optical code multiple access ( ocdma ) communication system is a spectral spreading system. all users in the system share all the bandwidth in the same time. because of the using of the almost infinitude bandwidth in the fiber, ocdma system will become more and more important in future ultra - high speed lan and online computer communication system

    光碼分多址（ ocdma ）通信系統，作為一種擴展頻譜系統，用戶同時共享所有帶寬，因為可以充分利用光纖中的巨大帶寬資源，因此在未來超高速局域網和實時計算機通信系統中將扮演重要角色。
  11. Distribution automation using distribution line carrier systems - part 5 - 3 : lower - layer profiles ; spread spectrum adaptive wideband profile

    使用分配線載波系統的分配自動化.第5 - 3部分:低層文件.擴展譜帶適配的寬帶截面
  12. Ss - ffh distribution automation using distribution line carrier systems - lower layer profiles - spread spectrum - fast frequency hopping ss - ffh profile

    使用配線配電線路載波系統的配電自動化.低層輪廓.擴展譜帶快速跳頻
  13. Ss - ffh distribution automation using distribution line carrier systems - part 5 - 5 : lower layer profiles - spread spectrum - fast frequency hopping ss - ffh profile

    使用配線載波系統的分配自動化.第5 - 4部分:低層輪廓.擴展譜帶快速跳頻
分享友人
分享到 Line

分享到臉書