fading time 中文意思是什麼

fading time 解釋
衰落時間
  • fading : 淡變
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  1. A channel estimator for multi - carrier system in fast time - varying fading channels

    一種快時變通道下多載波傳輸系統的通道估計方法
  2. Therefore, during system design, cascade coding combining reed - solomon codes and convolutional codes is utilized ; in addition, time - direction and frequency - direction interleaves are added to alleviate channel fading

    因此在進行系統設計時，採用了rs碼與卷積碼的級聯編碼方案，並同時加入時間交織和頻率交織來對抗通道衰落。
  3. As a combination of ofdm with space - time coding technique, mimo - ofdm becomes more and more important in the future wireless communication systems, the mimo - ofdm system can not only effectively enhance the transmission rate and capacity of the wireless communication system but also greatly mitigate the effections of mufti - path fading and interfere

    Mimo - ofdm技術將ofdm與空時編碼技術有機的結合在一起，能夠大幅度的提高無線通信系統的通道容量和傳輸效率，並能有效的抵抗多徑衰落、抑制干擾和噪聲。
  4. Shortwave channel is time varying transmission channel. it has dispersion in frequency and time domains. this characteristics hinds the data transmi - ssion at high speed and the correction of received data. in this dissertation i have analyzed the statistic characteristic of shortwa - ve channel, established the model of shortwave channel and simulated the rayl eigh fading distribution. the technology of spreading spetrum has been proved that it has the capability for anti - multipath and discerning multipath

    在短波通信中，由於通道的時間色散和頻率色散，引起多徑展寬和多徑衰落，前者限制了數據的傳輸速率，後者造成短波數據通信中出現突發錯誤，為了解決多徑效應對短波通信的影響，本文所做工作如下：首先詳細分析了短波通道的統計特性，建立其數學模型；其次分析了擴頻通信的特點，從理論上證明擴頻技術不僅具有抗多徑干擾能力，而且具有分離多徑的能力；介紹了傳統的rake分集合併技術的特點。
  5. 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。
  6. And the impact of processing conditions on the electrochemical performance of the porous sn - cu alloys was investigated. results showed that it was good to add more verdigris and to make the annealing time longer for improving the performance. however, the problem of capacity fading can not be solved completely by this method

    並對制備合金材料過程中所添加物質的種類和比例、燒結時間等工藝參數對合金的性能的影響進行了分析，發現添加堿式碳酸銅，並且增大添加比例以及延長燒結時間對電極材料的循環壽命有利，但是不能根本解決容量衰減的問題。
  7. Particularly, cr4 + - doped crystals as passive q - switch ( saturable absorber ) have got extensive attention, such as cr4 + : yag ， cr4 + : gsgg ， cr4 + : mg2sio4 and cr4 + : yso, which have the advantages of wild absorption band, good saturable absorption, long restored time, good photo - chemical stability, no fading, good thermal conductivity and high damage threshold

    特別是近年來，摻cr4 +離子的各種晶體如cr4 + : yag ， cr4 + : gsgg ， cr4 + : mg2sio4和cr4 + : yso等作為被動調q開關受到了廣泛的關注。它們具有很寬的吸收帶和良好的飽和吸收性質，恢復時間較長，光化學性質穩定，無退化現象，熱導性好，損傷閾值高。
  8. The theoretic formulas imply that mimo system can make use of multipath fading in full of scatter enviorment and its channel capcacity is in proportion to the transmt or receive antenna. 2. paper mainly explains the basic principle of bell laboratory layered space - time ( blast ) architecture

    2 .論文重點闡述了實現mimo系統中空間復用技術的貝爾實驗室空時分層（ blast ）結構的基本原理， blast結構作為實現mimo系統巨大容量的一種有效的手段，其核心是基於排序的串列干擾消除（ osic : orderingsic ）檢測演算法。
  9. Because the hybrid acquisition scheme ( combines parallel search with serial search ) based on the correlator provides the flexibility in the trade - off between the mean acquisition time and system complexity and is easy to implement, it ? focus on the scheme here. on the other hand, this paper analyzes the effect of multiple access inference ( mai ) on the code acquisition performance for the multipath fading channels

    基於相關器解擴的串-並混合方案由於有著可在平均捕獲時間和電路復雜程度（這是捕獲電路的兩個重要指標）這兩個技術指標間靈活折衷的優點和易於實現的特點，本文的重點就放在該方案中。
  10. The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above

    但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。
  11. Abstract : by comparing the channel capacities hetwem orthogonal space - time block coding and multi - antenna array system over rayleigh fading channel, some capacity loss for orthogonal space - time block coding is obtained, which is a function of the code rate, the rank of channel matrix and the number of transmitter and receive antennas, although the system of orthogonal space - time block codes is simple and easy to implemented. if is also shown that there is no capacity loss only if both the code rate and the channel matrix rank are all one

    文摘:在研究瑞利衰落條件下正交空時分組編碼通道容量的基礎上，將其與多發送多接收天線系統的通道容量進行了比較.比較結果表明，正交空時分組碼雖編碼簡單，易於實現，但在通道容量方面存在較大的損失，損失的程度與編碼碼率、通道矩陣的秩及收發天線數等因素有關.進一步研究表明只有當編碼碼率和通道矩陣的秩都為1時，才沒有通道容量的損失
  12. Section 4 researches on pilot symbol aided space - time 2d rake receiver in rayleigh fading channel. two kinds of 2d - rake receivers are proposed, one is the interference zeros force 2d - rake receiver ( zf - 2drake ). simulation results reveal zf - 2drake has the better performance than the conventional 2d - rake receiver

    研究了rayleigh通道下2種導頻輔助的空時2d - rake接收機結構:干擾置零2d - rake接收機（ zf - 2drake ）和基於空時通道估計的時空級聯2d - rake接收機（ spce - 2drake ） ，推導了它們的誤碼率性能。
  13. Diversity receiving technique for synchronous time spreading signal in time - varying fading channels

    時變衰落通道中同步時間擴展信號的分集接收技術
  14. Two approaches to improve the robustness of the detector, each based on a different theirs distortion mechanism. one is based on the modeling as fast fading distortion ( ffd ) whose optimum detector is the segmented replica correlator ( src ). the second approach is replica correlation integration ( rci ) for time spreading channel ( tsd )

    從頻率擴展通道（ fastfadingdistortion ， ffd ）和時間擴展通道（ timespreadingdistortion ， tsd ）的形成機理出發建立了目標回波的數學模型，指出ffd和tsd的最佳檢測器分別為分段副本相關器（ src ）和副本相關積分器（ rci ） 。
  15. Under rayleigh fading channel, we also simulated and compared ber in siso 、 simo and mimo systems. secondly, based on careful study the ber and the channel capacity under white noise channel under mpsk modulation when the channel is rayleigh fading, we duduced the expressions of stbc ’ s ber and channel capacity under rice and nakagami fading. and also analysed the performances through numerical simulation using matlab to testify the exactitude of the dudeced expressions. finally, there exists an error floor of stbc through studying on its performance on time - selectiv fading channel. we analysed the reason and proposed two new decode combination scheme to eliminated the error floor and the performance of stbc on time - selective fading channel is improved. and also compared the two scheme ’ s complication and snr gain

    這些結果大部分是閉式結果，能比較準確地衡量空時塊碼的性能，並對不同衰落的性能做了相互比較，其結果對空時塊碼的實際應用具有一定的指導意義。實際的通道是時變的，分析了空時塊碼在時間選擇性衰落通道中產生誤差地板效應的主要原因是存在碼間干擾（ isi ） ，在此基礎上提出了兩種能消除誤差地板效應的譯碼合併方案，並對這兩種方案的復雜度和信噪比增益進行了比較。
  16. By changing the multiple time - varying fading factors of the strong tracking filter, mstkf switches between kalman filtering and strong tracking filtering

    通過直接改變強跟蹤濾波器的多重時變漸消因子， mstkf在卡爾曼濾波和強跟蹤濾波兩種工作狀態之間切換。
  17. The characteristic of the time - variety channel may be represented by rayleigh fading and doppler frequency shift

    這種通道的時變特性可用瑞利衰落和多普勒頻移來表徵。
  18. In this dissertation, multiuser detection and space - time processing are combined to suppress multiple access interferences and inter - symbol interferences ( isi ) jointly in multipah fading channels with large delay spread

    本文組合多用戶檢測和空時處理技術，在大時延擴展的多徑衰落通道條件下，研究多址干擾和符號間串擾的聯合抑制。
  19. In mis paper the muitipath radio channel ' s characters were discussed in detail, they include the multipath number distribution, the muftipafh time delay distribution and the muitipath small scale fading distribution. their distribution taws were theoretically derived by new ideas and were simulated in computer, the results were wem proved according with the actual tests published in ieee papers

    新的參數分佈模型能夠用實際測試結果進行修正，模擬出的結果與權威文獻發表的實測數據吻合較好，而以往的經驗分佈只是本文推導出的參數分佈在一定情況下的特例。
  20. A new approach to equalization of linear single - input single - output time - selective fading channel

    時間選擇性衰落通道迫零均衡新方法
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