頻移傳輸 的英文怎麼說

中文拼音 [bīnzhuànshū]
頻移傳輸 英文
frequency shift transmission
  • : Ⅰ形容詞(次數多) frequent Ⅱ副詞(屢次) frequently; repeatedly Ⅲ名詞1 [物理學] (物體每秒鐘振動...
  • : Ⅰ動詞1. (移動) move; remove; shift 2. (改變; 變動) change; alter Ⅱ名詞(姓氏) a surname
  • : 傳名詞1 (解釋經文的著作) commentaries on classics 2 (傳記) biography 3 (敘述歷史故事的作品)...
  • : Ⅰ動詞1 (運輸; 運送) transport; convey 2 [書面語] (捐獻) contribute money; donate 3 (失敗) l...
  1. Otherwise, this paper introduces the concept of the principle signal in the same channel transferred bidirectional and the phasic equalizer

    並對這些器件的測試結果進行了討論。講述了同信號雙向原理及相均衡器的簡單概念。
  2. 8b / 10b encoding adapt the characteristic of fiber channel very well, it has been used in high - speed fiber transmission broadly. it avoids the appearance of continuous “ 1 ”, “ 0 ”, offers plenty of bit synchronization time information, enhances the stability of output light signal, reduces interference between signals and offers proper redundancy to check error through transmission

    它避免了連「 1 」 、連「 0 」碼的出現,提供了豐富的位同步定時信息,減少了直流基線漂,提高了光出功率的穩定性,減少了高低分量,改善了信號間的串擾,提供了適當的冗餘,便於檢測系統中帶來的錯誤。
  3. The equation including the nonlinear dispersion, i. e. the modified nonlinear schrodinger ( mnls ) equation, is a better model. in this thesis, we take mnls solitons as a model for femtosecond soltions. then based on the recently developed direct perturbation theory for perturbed mnls equation, we study the raman self - frequency shift of femtosecond solitons and its suppression by the means of frequency filters. for this purpose, first, we define the physical parameters of mnls solitons ; next, through the direct perturbation theory for perturbed mnls equation, under adiabatic approximation, we obtain the evolving parameters of mnls soliton on our questions and then choose the parameters of frequency filters based on it ; at last, we directly numerically simulated our questions by split - step fourier ( ssf ) method after improving the arithmetic of the differentiation of the nonlinear item for satisfying mnls equation

    本論文以mnls孤子作為光纖飛秒孤子的模型,通過新近建立的mnls孤子直接微擾理論,研究光纖中由拉曼效應引起的飛秒孤子在中的自,以及通過率濾波對自的抑制。為此,首先給出描述mnls孤子的各物理量,然後用mnls孤子直接微擾理論,解析地得到這些問題絕熱近似下的孤子參數演化,並由此選擇率濾波的參數,最後用分步傅里葉方法,在對非線性項微商的演算法做出了適合於mnls孤子的改善後,對拉曼效應及率濾波進行了直接數值模擬,其中率濾波參數用微擾理論確定。
  4. Further investigated and analyzed composition structure and flow data that dsa ' s formation of image is systematic at first in this paper, carried on intact summing up to the data in the system, having given out the plan of design of high speed and large capacity data channel of digital formation of image system of x - ray ; deeper discussion of control way on sdram, give solution that many pieces of sdram works togetherses of realizing heavy capacity, designing of heavy capacity deposit board realize storing at a high speed to vision data by frame on the basis of this ; through further investigations of interface of pci bus, optimize back end state machine design and urge procedure making with lower, giving intact pci interface scheme that realize high speed dma data transmission and satisfy request of video transmitting ; further investigate the figure systematic design method of programmable logic devices, due to the difficult point of drifting about of enabled signal in fifo in common use and setting up and keeping of output signal, method has been proposed of improving stability of system making use of signal utilizing the phase locking ring in fpga to offer a lot of clocks to move thus realize coordinating the data between every module of system to transmit at a high speed by making use of fifo

    本文首先對數字減影血管造影( dsa )成像系統的組成結構和數據流向進行了深入研究和分析,並對系統中的數據流向進行了完整的歸納和總結,給出了x線數字成像系統中的高速大容量數據通道的設計方案;在對sdram的控制方式做了深入探討后,給出了實現大容量多條sdram共同工作的解決方案,在此基礎上設計了大容量幀存板實現對圖象數據進行高速存儲;通過對pci總線介面的深入研究,優化後端狀態機設計和低層驅動程序開發,給出了完整的pci介面方案實現高速dma數據,完全可以滿足視要求;深入研究了基於大規模可編程器件的數字系統設計方法,針對通用fifo使能信號漂出數據難于建立和保持等設計難點,提出了利用fpga中的鎖相環提供多個時鐘相的信號來提高系統穩定性的解決方案,從而實現利用fifo來協調系統各模塊之間的數據高速
  5. According to the guidline, two nd : yag lasers have been designed and set up, one is end - pumped by lower output power ld using a selfoc micro lens, and the other is end - pumped by high output power ld using a pair of lenses are designed, and the characteristics such as output power and power stabilization of both solid - state lasers are investigated. thirdly, when an empty liquid crystal cell is inserted in the cavity of the nd : yag laser pumped by high power ld, the laser can operates in single axial mode. finally, according to the relationship between the laser output power and the longnitudinal a ld - end - pumped nd : yag laser sensor for displacement measurement has been investigated theoretically and demonstrated experimently, the results indicate that when the mean radius of pumping inside the laser cavity is far less than that of the oscilating laser mode, the exponential of the output power is a gauss function of the longitudinal positon of focused spot of ld pumping beam, both the measurement range and the sensitivity are dependent on the incident pumping power, as the incident pumping power is increased, the measurement range is enlarged and the sensitivity is improve d

    本文首先介紹了ld泵浦nd : yag激光器的發展狀況、主要特性及其應用,從四能級速率方程出發,推導了ld泵浦nd : yag激光器的閾值、出功率和斜效率的表達式,並簡述了激光器的工作原理、結構型式和倍方法;其次,以空間相關的速率方程為基礎,提出了ld端面泵浦nd : yag激光器的設計方法,給出了一定泵浦耦合方式下,振蕩光模尺寸、最佳出耦合率、泵浦光模尺寸、泵浦光焦斑位置等參數的選取依據,以此為依據,設計了自聚焦透鏡耦合小功率ld泵浦nd : yag激光器和透鏡組耦合高功率ld泵浦nd : yag激光器,對激光器的出功率和功率穩定性等特性進行了實驗研究;再次,在帶尾纖出的高功率ld泵浦nd : yag激光腔內插入一隻空液晶盒,觀察到了激光器以單縱模運轉;最後,根據泵浦光焦斑端面位置對激光出功率的影響規律,提出了ld端面泵浦nd : yag激光位感新方法,並進行了理論和實驗研究,研究結果表明:當激光晶體內泵浦光平均光斑半徑遠小於振西安理工大學碩士學位論文蕩光束腰半徑時,激光出功率的自然指數與泵浦光焦斑的縱向位置成高斯變化規律,測量范圍和靈敏度依賴于泵浦功率,隨著泵浦功率的增加,測量范圍擴大,靈敏度提高,當端面泵浦功率為7 . 24w (最大出功率為1 . 926w )時,激光位感器的測量范圍和靈敏度分別是13 . 045mm和0 . 148mw / pm 。
  6. The videos, voices, data combined traffic and high speed data are becoming more and more predominent in the future, and how to efficiently transfer this multi - medium integrated - data is one of the researcher ' s interesting field. the cdma system, which has striking advantages of anti - multipath fading, soft capacities and large capacities over fdma and tdma systems, has been focused by all of the countries

    未來信息社會中,圖象,話音,數據相結合的多媒體業務和高速數據業務量越來越佔主要地位,如何有效地這種多媒體數據,已經成為動通信中的研究熱點之一。擴技術由於具有抗多徑,軟容量和時分多址與分多址更大的容量和優勢,而受到各國研究者的重視。
  7. Bits supplies the synchronous timing signal to these equipments inside the telecommunicationt building, such as dps, atm, no. 7, dxc, tm & adm in sdh, don and in etc. the related techniques are involved in the content of synchronization ne twork, timing distribution, the timing signal transportations x impairments etc. the second chapter tells the structure and the function of the building integrated timing system. the third chapter summarizes the digital synchronization network techniques, which emphasizes the basic concept of synchronization networks analyzes the necessity of building the synchronization network and introduces all kinds of synchronization methods. the fourth chapter represents the transportation of the synchronization signal

    本文第二章講述了通信樓綜合定時系統的構成及作用:第三章概述了數字同步網技術,著重描述了同步網的基本概念,分析了建立同步網的必要性,講述了各種同步方法;第四章闡述了同步定時信號的;第五章介紹了bits設備所支持的同步狀態消息;第六章、第七章為本文的重點,通過對時鐘信號建立數學模型,從理論上分析時鐘內部噪聲和相位瞬變產生時鐘定時信號損傷的原理,企圖尋找到更好地控制率漂的方法。
  8. And pays emphasis on analyzing the system structure and system flow, the core techniques, the channel characteristic and parameters of dvb - t system. the system adopts some core techniques such as cofdm, a lot of tps ( transmission parameter signalling ) insert and guard interval, and so on. so it can withstand high - level ( up to odb ), long delay static and dynamic multipath distortion

    論文首先描述了數字電視地面廣播的需求條件,技術難點和目前存在的問題,並重點分析了dvb - t系統結構流程,核心技術及系統通道特性和參數,該系統採用了cofdm (編碼正交分多路復用) ,大量導信號插入和保護間隔技術等核心技術,使之能抵抗高電平( 0db ) ,長延時的靜態和動態多徑失真,有利於數字和模擬電視的混合,它的多載波調制模式功能和性能在動和便攜接收、同網等方面具有獨特的優勢。
  9. The advantages of using leo satellite are as following : on the one hand the satellite orbit is low, so the transmission delay is short, the power loss is small ; on the other hand the development of cell communication, multi - access, frequency multiplex and etc also provide a technique guarantee to the leo satellite - mobile - telecommunication. so the leo system is considered to be a satellite - mobile - communication system with a great future

    低軌道衛星是一種運行於1000公里左右的高空中的人造衛星,利用leo衛星實現個人通信的優點在於:一方面衛星的軌道高度低,使得延時短、路徑損耗小,多個衛星組成的星座可實現真正的全球覆蓋,率復用更有效:另一方面蜂窩通信、多址、點波束、率復用等技術的發展也為低軌道衛星動通信提供了技術保障。
  10. The real - time mobile video surveillance system includes : the surveillance subsystem of control center, the station surveillance subsystem, the vehicle subsystems and transmission subsystems

    實時動視監控系統包括:控制中心監視子系統、車站監視子系統、車載子系統和子系統。
  11. In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly. multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers. by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable

    在wcdma系統中,為正確解擴解調接收到的擴信號,接收機本地產生的擴碼( pn碼)相位必須和接收信號中的擴碼相位完全同步;同時動通信環境中的信號由於接收機和發射機之間的直達路徑有可能被建築物或其他障礙物所阻礙,總是經過折射或反射的多條路徑后才到達接收機,從而產生多徑通道。
  12. Aimed at the characteristics that multi - carrier transmission is sensitive to frequency offset and require high synchronization performance, firstly multi - carrier ofdm technique is introduced, the influence of synchronization offset to ofdm system is analyzed and two kinds of typical synchronization methods are given based on pilot and cp in the paper

    針對多載波對載波偏敏感,對同步要求高的特性,論文首先介紹了多載波ofdm技術,分析了同步偏對ofdm系統性能的影響,給出了基於導和循環前綴的兩種典型的同步方法。
  13. The mobile multimedia communication system need to support the transmission of high - speed data and variable speed data compared with the ordinary spread spectrum communication. the data rate ranges from several kbps to hundred kbps for wide up to 2mbps. in order to assure different data rate to transmission in the same spread spectrum bandwidth, we need to use different lengths and orthogonal pn codes

    動通信系統所提供的數據速率一般只有幾kbps ,而動多媒體通信所要求的數據速率范圍為幾mbps甚至幾十mbps ,在同一擴系統內多媒體的擴比也不一樣,就要採用不同長度的偽碼,而且偽碼之間必須保證正交性或準正交性。
  14. The two rails are not only signal lines of track circuits, but also loop current line of locomotive traction current in electrified railway block

    在電氣化鐵路區段,兩條鋼軌既是信號的線又是機車牽引電流的迴流線。
  15. Code division multiple access ( cdma ) communications systems being possessed of the merits of great capacity and soft hand - off and so on must have taken a significant role in future wireless communications systems. because pn sequences used in communications systems are been vertical completely, when numbers of user are more, there are multiple access interference ( mai ) in cdma and serving quality in communications systems is reduced

    碼分多址( cdma )通信系統以譜利用率高、系統容量大、率管理容易,軟切換、動臺發射功率低、通道的速率高等優點代表了新一代動通信,在未來的無線通信系統中必將扮演極為重要的角色。
  16. This series of products also claim that " m " was connected, it clenched the teeth after adopting the end tooth, the whorl is joined, it suitable radio communication, cellular telephone and office land network make electric signal transmit and join radio frequency cable spend among a small circle

    該系列產品亦稱「 m 」接頭,它採用了端齒嚙合,螺紋連接,它適用無線電通訊、動電話及小范圍局域網路作電信號連接射電纜之用。
  17. Mimo - ofdm has been regarded as the key technology of b3g communication system because it can improve system capacity and spectrum efficiency. however, ofdm is very sensitive to frequency offset

    由於能夠顯著改善譜效率、提高數據速率和系統容量, mimo - ofdm技術被廣泛認為是后三代動通信系統( b3g )的關鍵技術。
  18. Aiming at these problems, this thesis analyzes how cofdm technology is used to implement wireless video transmission under the condition of high moving speed

    針對這些問題,本文探討將cofdm技術用於高速動條件下無線視的實現方案。
  19. In the future, we will increase the number of the frequency - hopped sub - bands. it will solve the inter - symbol interference ( isi ) perfectly. then the system will be used on the test out of labs

    后續的工作只要把十六進制改為八進制(此工作不難)的數字鍵控系統,藉以提高跳的子帶數目,即增加跳點,可期適于海上的應用。
  20. The author considered great numbers of transmission characteristics of real channel in lms model and properly simplified it according to requirement in the project. the key characteristics in the model include multi - path fading, shadow fading, doppler shift, propagation noise, multi - path delay and and state transform of three status homogeneous markov chain described by lms model, etc. the key characteristics of channel are properly collocated and made to be the evidence theory of hardware implementation

    Lms模型考慮了大量的實際通道特性,結合課題需求,實現過程中對lms模型做了適當簡化,考慮了其中的多徑和陰影衰落、多普勒播噪聲、多徑延遲以及lms模型所描述的三狀態齊次markov鏈的狀態轉換等,對其所描述的主要通道特性適當組合,以此作為硬體實現時的理論依據。
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