載波導頻系統 的英文怎麼說

中文拼音 [zǎidǎobīntǒng]
載波導頻系統 英文
carrier pilot system
  • : 載Ⅰ名詞(年) year : 一年半載 six to twelve months; six months to a year; 三年五載 three to five ...
  • : Ⅰ名詞1 (波浪) wave 2 [物理學] (振動傳播的過程) wave 3 (意外變化) an unexpected turn of even...
  • : 動詞1. (引導) lead; guide 2. (傳導) transmit; conduct 3. (開導) instruct; teach; give guidance to
  • : 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...
  • : 系動詞(打結; 扣) tie; fasten; do up; button up
  • : Ⅰ名詞1 (事物間連續的關系) interconnected system 2 (衣服等的筒狀部分) any tube shaped part of ...
  • 波導 : [物理學] (用在微波波段傳輸電磁波的裝置) waveguide; duct
  • 系統 : 1. (按一定關系組成的同類事物) system 2. (有條理的;有系統的) systematic
  1. 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結構流程,核心技術及通道特性和參數,該採用了cofdm (編碼正交分多路復用) ,大量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傳輸,它的多調制模式功能和性能在移動和便攜接收、同網等方面具有獨特的優勢。
  2. This article describes a way of special ultrasonic system which monitors thermal stress in seamless welded rails. this monitoring system is a non destructive testing system, which adopts avr mcu and high - precise time chip processing as the core of it, and adopts the critically refracted longitudinal wave as the object of measuring. my studying focuses on the theory of the monitoring system, which will be listed in this arctile : according to the snell theory, the theory of motivating of critically refracted longitudinal wave is described in details, and the finite element software is used to emulate the propagating course. the formulas of calculating the pts of swr are taken from the acoustoelasticity theory, and the calculating the parameters is introduced. according to assemble materials, three kinds of ways of monitoring the pts of swr using critically refracted longitudinal wave are described, which are measuring the sound - time in changeless distance, ultrasonic critical - angle refractomery and frequency spectrum, the first way of ways is used in this experiment system. the factors, which effect the monitoring system, are assaid in some degree based

    本文的研究工作重點在無縫焊接鋼軌溫度應力測量的理論模塊,包括根據snell原理,研究極限折射縱的激發機理,並使用有限元軟體ansys進行模擬;根據聲彈性理論以及公式推出計算無縫焊接鋼軌中的溫度應力的公式,並對其中參數的求解方法進行介紹;根據收集的資料,介紹了三種使用極限折射縱測量無縫焊接鋼軌溫度應力的方法,即固定距離測量聲時法、臨界角折射法和譜分析法,本實驗使用的是第一種;根據實驗經驗以及相關資料,分析了影響極限折射縱測量溫度應力的幾個因素,並提出了相應的解決方法;根據實驗的需要,獨立設計並加工出相關配套的實驗設備,包括實驗鋼塊、有機玻璃楔塊、固定件、荷外框裝置等。
  3. The spot responder system which is the necessary part of ctcs is analyzed in the dissertation and three key technologies of the channel in the responder system are researched. firstly, a new kind of rectangular plate magnetic inductive loop antenna is designed to transmit the power frequency. researching the near field inter - inductive characters, the relationship among the inductive efficiency, the perimeter and the conductor width of the antenna is found out

    本文在對ctcs中的點式應答器原理及組成進行分析和消化的基礎上,對中通道的幾個關鍵技術進行了詳盡的研究,主要分為三個方面: 1 ,提出並研製了新型的片式環形磁感應天線,並對傳輸能量的天線的近場互感特性進行了分析,得到互感效率隨天線的周長大小以及帶寬度的變化規律,並通過計算機模擬和試驗對天線的近場瓣圖進行了研究;通過分析寬帶匹配技術中的實法理論,設計了信號天線的寬帶匹配網路。
  4. 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

    針對多傳輸對偏移敏感,對同步要求高的特性,論文首先介紹了多ofdm技術,分析了同步偏移對ofdm性能的影響,給出了基於和循環前綴的兩種典型的同步方法。
  5. It is necessary in digital communication system that carrier recovery can compensate frequency offset and phase jitter brought by transmission and modulation. this paper is mainly focused on carrier recovery technique. we introduce the channel model at cable headed and receiving site. firstly, we introduce the principle of carrier recovery and give some algorithms of them, which are directed - decision, reduced constellation and frequency sweeping

    本論文緊緊圍繞著數字通信中的恢復技術,在介紹了有線通信所用的調制解調通道模型后,首先闡述了恢復技術的思想和基本原理,在此基礎上給出了三種恢復演算法,即判決向演算法、簡化星座判決演算法和掃演算法,並且給出了其各自的模擬圖:然後深入研究了一種適合高階qam並且能糾正較大偏的恢復技術:極性判決演算法。
  6. It is composed of thirteen functin ? components including two 3 - db y - junction power splitter, two directional couplers, two waveguide attenuators and one polarizer of waveguide itself. the prominent feature of the device is that it has a beat detection function with respect to the single y - branch mioc device, and it plays an important role in improving the inertial - grade and the high precision steady - aim system because of the beat detection function. farthermore it has direct influence on the improvement of the high flexibility, shockproof and overload - resistance for the steady - aim system

    器件的工作長為1 . 3 m ,集分束器、合束器、起偏器/檢偏器、相位調制器、吸收器等十三個功能單元於一體,除了單y多功能集成光路器件具備的功能外,它還具有拍檢測功能,因而對提高慣級和高精度穩瞄起著重要的作用,並直接影響著穩瞄的高機動性、抗沖擊力和過能力的提高。
  7. 2 the electromagnetic compatibility ( emc ) of the new radio induction system is analyzed, this paper studies the affections for the new radio induction system excited by the conductive interference and radiated interference, this paper also studies the affection to the out - space environment excited by the new radio induction system. 3 this paper studies the applications in analog carrier communication for the new radio induction system from the mod - d

    2研究了新型無線感應的電磁兼容性,分析了傳干擾對新型無線感應的影響,分析了輻射干擾對新型無線感應的影響;分析了新西南交通大學博士研究生學位論文第11頁? ? 3主要從調幅( am 、 dsb 、 ssb ) 、窄帶調相( nbpm ) 、窄帶調( nbfm )等調制解調中研究了新型無線感應在模擬通信中的應用並進行了模擬,研究了上述調制解調相應的解調增益。
  8. A pilot subcarrier - based joint frequency offset correction and channel estimation method for ofdm systems

    中一種基於的聯合率偏移糾正和通道估計方法
  9. ( 3 ) a blind channel estimator based on the aid of pseudo - pilot - symbols ( pps ) is proposed in term of the two characters of ofdm system : the finite alphabet property of information symbols and independent property between subchannels

    ( 3 )利用ofdm傳輸的信息符號為有限字符集和各子的相互獨立特性,提出了用偽符號( pps )進行通道的盲估計演算法。
  10. A group of orthogonal frequency carriers are used in ofdm system to improve the using rate of spectrum. if the orthogonal character can be held and ignore the inter - channel interference ( ici ), the symbol error character of ofdm depend on the modulate of source codes. this dissertation propose the theoretic formula of ofdm - qam and ofdm - psk in this precondition

    為了提高譜利用率, ofdm使用了一組正交的子來傳輸信號,若能保證各子間的正交性不被破壞、不考慮通道間干擾( ici ) ,則ofdm的誤碼性能由信元調制方案的誤碼性能決定,文中推了該情況下ofdm - qam和ofdm - psk的理論誤碼率公式。
  11. Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity. these applications include not only system performance improvement, but also reduction of the peak to average power ratio in mimo - ofdm systems. under these backgrounds, this paper first studies space - time block codes under the single carrier, flat fading situation, discusses the encoding / decoding principle and its performance under different channels. then, the author focused on the performance of space - time codes under time selective and frequency selective channels, uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation

    在上述背景下,本文以單,平坦衰落通道下的空時分組碼為切入點,深入分析了其編譯碼原理和在不同通道情況下的性能;以此為基礎,後文展開了對空時分組碼在多,時間選擇性和率選擇性衰落通道下的性能研究,通過理論推和充分的模擬,揭示了空時/分組碼在時選擇性衰落通道中的性能變化的根本原因;在以上對多中空時分組碼的研究的過程中,作者發現了空時分組碼在降低峰平比方面應用的可行性,提出了一種降低峰平比的新方法。
  12. The list betterments aimed at the properties of system : through the testing of dc voltage, pulse width and inverting voltage and frequency can be regulated online to fit for different steady load ; reducing speed ripples by compensating with nonzero voltage working proportional time ; adopting the technology of harmonics suppression. as a result, the high precision and wide speed control is realized and the step out is overcome

    針對的性能指標,做了如下改進:對直流側電壓的檢測,在線調整逆變器通脈寬、輸出電壓和率,可以適應不同大小的恆負;並用非零電壓矢量作用時間進行補償的方法,減小電機的低速脈動;加入了諧抑制技術等。
  13. Firstly, in wireless environment, receiver has no know the time delay between transmitter and itself. in ofdm system, ofdm data is transmitted as one symbol, so in order for correct demodulation, the correct start of symbol should be got from ofdm system to reduce the effect of isi. secondly, the high frequency utilization in ofdm is based on the orthogonal properties of sub carriers. if frequency offset is generated, the orthogonal properties among sub carriers will lost, that will cause inter carrier interference ( ici ) and high ber of system

    Ofdm技術也存在著一些缺陷,首先,在無線環境中傳輸的ofdm信號對定時要求高,為了減少碼間串擾( isi )影響,必須從接收信號中提取出正確的符號起始位;其次, ofdm率偏移敏感, ofdm技術的高譜利用率和傳輸可靠性均以子的正交性為基礎,如果接收機和發射機之間發生率偏移,子之間就會失去正交性,致嚴重的子間干擾( ici ) ,降低性能。
  14. The influence such as the arranging of measurement sensors, wavelet ’ s resolution ( related to sampling frequency ) is also discussed. conclusions are : ( 1 ) there is critical resolution existing in moving force identification. when the resolution is lower, large local error arises, and when higher, good results will be present

    本文還研究了小解析度(與信號采樣率關聯) 、測點排布等因素對識別結果的影響,得出如下結論: daubechies ( 1 )在車橋的移動荷和預應力識別過程中存在臨界解析度,低於此解析度會致產生局部較大誤差,高於它時識別效果良好,且隨著解析度的增大會有微小改善。
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