時變多徑通道 的英文怎麼說

中文拼音 [shíbiànduōjìngtōngdào]
時變多徑通道 英文
time variable data
  • 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...
  • 徑 : Ⅰ名詞1 （狹窄的道路; 小路） footpath; path; track 2 （達到目的的方法） way; means 3 （直徑的簡稱...
  • 通 : 通量詞（用於動作）
  • 道 : Ⅰ名詞（道路） road; way; route; path 2 （水流通過的途徑） channel; course 3 （方向; 方法; 道理） ...
  • 通道 : thoroughfare; passageway; pass; enterclose; gallery; drong; tunnel; avenue; alure; way; row; key ...
  1. 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。
  2. The new method is a modified pts method, and can make good compromise between performance and computational complexity. the dissertation explores, by means of computer simulation, how the conventional method based on amplitude - limiting and filtering affects the performances of wavelet packet modulation signals, and presents a new method, namely, selective mapping / amplitude limiting / filtering method, which proves to be effective, simple, and have better ber performance

    並基於自子波變換和時間、尺度解析度的概念，從理論和模擬實驗兩方面對通道建模和時間/尺度rake接收機進行了分析，並與傳統的kake接收機進行了比較，結果表明時間/尺度聯合分集能有效地克服高速衰落多徑通道的影響。
  3. Aiming at the lower performance and floor effect of the traditional orthogonal frequency division multiplexing channel estimation, the ofdm channel estimation algorithm based on wavelet recursive least square support vector machine ( wrls - svm ) is proposed

    摘要針對傳統多徑衰落下的ofdm導頻通道估計性能低下，地板效應的缺陷，提出了基於導頻的小波遞歸最小二乘支持向量機（ wrls - svm ）時變通道頻率估計演算法。
  4. Combined with the data - selected schemes proposed, the computational complexity of this method can be lowered. the performance of the presented rls method is analyzed by simulations, and it is shown that this method is interesting for application. 4 time - selective channel signal model based on multipath - doppler diversity representation is given in multi - path fast fading channel, and rls space - time receiver algorithm based on time - varied constraint condition is presented and the computational complexity of this method is analyzed

    4 、針對多徑快衰落通道下的ds - cdma系統，給出了基於多徑-多譜勒觀點描述的1百安電弓卜科東兔j憶學協士學位論文時間選擇性通道的信號模型，提出了基於變約束條件下的遞歸最小二乘空時接收機演算法並分析演算法的運算量，最後通過模擬分析了所提出的方法的性能。
  5. The principles, schemes and performances of mc - cdma are illustrated in this thesis. the model of time - varying multi - path is analyzed and realized

    本文簡要介紹了mc - cdma的基本原理、系統結構和性能，分析並實現了多徑時變通道的數學模型。
  6. Statistics and simulations of wssus time - varying simulations multipath channel

    時變多徑通道的統計特性與模擬
  7. In this paper, the fundament, the system architecture and the application of orthogonal frequency division multiplexing ( ofdm ) were discussed, and the mathematic model of time - varying multi - path based on the discussion of mobile fading channel characteristic were analysed, and the channel model were discussed by computer simulation

    本文首先簡要介紹了正交頻分復用（ ofdm ）的基本原理、系統組成以及ofdm的實際應用。在分析移動通道衰落特性的基礎上，分析了多徑時變通道的數學模型；並用計算機模擬的方法對通道模型進行了討論。
  8. With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )

    但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。
  9. Second, the popularization and application of internet technology has a revolutionary impact on the compiling and publication of the academic journals and gives a lot more and newer to the editorial work : sufficient information supplies editorials with a good environment to make in - advance plans ; the open and comprehensive information system makes editorials compile journals and update reviewer database in time and accurately ; editorials can accept papers and submit papers for reviewing by internet communication tools ; editorials can also contact the authors conveniently by emails for decline or revision of the papers ; the department of editorial and print plant can exchange data through the net for printing hard copies ; more sale methods are made based on the internet ; more ways are made for readers " feedback

    其次，網路技術的普及和應用還使學術期刊編輯、出版的工作方式發生了變革，賦予了編輯工作更多更新的內容：信息量的充分為編輯制訂計劃創造了良好的信息環境；信息的開放與全面使編輯可以及時準確地組稿和更新審稿人數據庫，編輯還可利用網路通信工具實現稿件送審；可以利用網路及時與作者聯系方便稿件的退修；對印刷版，可以利用網路方便地在編輯部和印刷廠之間傳遞數據；為期刊網上發行渠道的開通提供了平臺；拓寬了讀者反饋的途徑。此外，學術期刊光盤版和網路版的出現為學術期刊的經營提出了一種新的模< wp = 4 >式。
  10. Rtce is based on forecasting the inherent vulnerabilities to propagation of hf time - varying channel, including multipath delay, doppler spread, selective fading, interference, so this paper also introduces characteristics of hf channel in the beginning. familiar rtce systems all adopt envelope method that bello brought forward

    實時選頻技術是基於對短波電離層時變通道固有的不利於電波傳播的各種因素，包括通道的多徑展寬、多普勒展寬、選擇性衰落、噪聲干擾等的預測的基礎上實現的，所以在開篇對短波通道的特點進行了詳細的介紹。
  11. And key technologies of mc - cdma, channel estimations and diversity combinations, are mainly studied for the application of mc - cdma. the channel estimation based on pilot carriers is analyzed, and an improved method with wiener filtering is presented. simulations of the method are carried in time - varying multi - path channel

    本文分析了基於導頻的通道估計演算法，提出了採用維納濾波平滑的改進估計演算法，並在多徑時變通道下進行了計算機模擬，對系統各參數分別對通道估計誤差和誤碼率性能的影響做了詳細分析和比較，從而證明了演算法和改進的有效性。
  12. When the high rate data is transmitted through bandlimited channels in mobile communications, the intersymbol interference ( isi ) caused by channel distortion and multipath propagation will bring decoding error. it needs to adopt appropriate techniques to remove or reduce this kind of interference

    當在帶限通道上傳輸高速數據時，會因為通道畸變和多徑效應產生的碼間干擾而產生誤碼，這就需要採用適當的技術來消除或減少這種干擾。
  13. For power control of listening users, forward power control method are introduced based on full, multichannel, filtered report, and collision method etc. the full report method has redundancy report information, and its real - time performance is bad, multichannel report is introduced to improve the real - time performance, and filtered report is introduced to eliminate the redundancy information, finally the collision method introduced can not only get higher real - time performance but also diminish the redundancy information ; 2. in order to meet the requirements of making the dynamic simulation of trunking group system, the ms ’ s random move equation is brought forward, the simulation of ms ’ s distribution is done and the integrated channel model are presented ; 3. the smart predicative model of power control is introduced to overcome the delay and track the change of the complicated network, with this model, the power control ‘ s performance is greatly improved

    全匯報方法存在冗餘的匯報信息，而且實時性較差，為了改善實時性提出了多通道的匯報方式，為了改善冗餘匯報而提出了篩選法，最後介紹的碰撞法在減少冗餘信息的同時又提高了實時性;二、為了集群功率控制動態模擬的需要，提出了移動臺的隨機運動方程，進行了有關移動臺的分佈模擬，建立了綜合的通道模型;三、希望克服延時和跟蹤復雜網路環境變化，提出了功率控制的智能預測模型，通過智能預測模型可以改善功率控制的性能，著重介紹了採用神經網路的方法實現智能預測的通用模型，從而跟蹤復雜多變的無線環境，諸如慢衰落及快衰落（包括多徑衰落、多普勒效應所引起的衰落）等網路特徵，達到預測功率需求;四、採用二級正交碼和智能天線（空分多址）的方法進行組內用戶的識別，改進功率控制效果;五、話權用戶的前向和反向功率控制方法;六、對引入gota的cdma系統提出了復合容量表示方法，並作容量分析，探討有關gota系統的qos問題。
  14. However, the administration of distribution is very much difficult in actual and subjected to many elements effects, such as, being difficult to formulate the distribution plan, being difficult to the selection of distribution way, being difficult to deliver goods on time, the evaluating criterion not definite, driver work time not sure, easily fatigue, loss and damage of goods in the process of distribution ; meanwhile, distribution, still is subjected to many un - controlled elements effects in the process of operation, for example, the distribution areas of client communication networks in way the limitation of vehicle passing through service time requirement change of stream of cars and so on

    然而現實當中物流配送管理非常困難，受到許多因素的影響，如難以制訂配送計劃、難以選擇配送路徑、難以按時交貨、配送績效評價基準不明確、司機工作時間不定、易疲勞以及貨物在配送過程中的遺失和損壞等；與此同時，物流配送在操作的過程中，還受到許多不可控因素的影響，如客戶的分佈區域、道路交通網路、車輛通行限制、送達時間要求、車流量變化等，為此必須加強物流配送系統的規劃和設計。
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