衰落落天線 的英文怎麼說

中文拼音 [shuāilàlàtiānxiàn]
衰落落天線 英文
fading reducing antenna
  • 衰 : 衰動詞（衰弱） decline; wane
  • 落 : 落名詞[方言] （北方對蓮花落的俗稱） a kind of folk song
  • 線 : 名詞1 （用絲、棉、金屬等製成的細長的東西） thread; string; wire 2 [數學] （一個點任意移動所構成的...
  • 衰落 : decline; be on the wane; go downhill; fading; decay; decaying; lapse; erode
  1. A move had to be made because that merry old soul, the grasswidower in question, who appeared to be glued to the spot, didn t appear in any particular hurry to wend his way home to his dearly beloved queenstown and it was highly likely some sponger s bawdyhouse of retired beauties off sheriff street lower would be the best clue to that equivocal character s whereabouts for a few days to come, alternately racking their feelings the mermaids with sixchamber revolver anecdotes verging on the tropical calculated to freeze the marrow of anybody s bones and mauling their largesized charms betweenwhiles with rough and tumble gusto to the accompaniment of large potations of potheen and the usual blarney about himself for as to who he in reality was let xx equal my right name and address, as mr algebra remarks passim

    該離開了，因為這位讓老婆守活寡的快活的人兒253好像被膠膘在這里了，他一點兒也不急於回到他那頗可懷念眷戀的王后鎮家中去。今後幾天內，要是想知道這個形跡可疑的傢伙的下落，老鴇搜羅幾名年老色衰的佳人兒在下謝里夫街那邊開起來的窯子倒是可以提供最可靠的線索。他忽而講了一通發生在熱帶附近的六響左輪槍奇聞，打算把她們人魚們嚇得毛骨悚然，忽而又對她們那大塊頭的魅力加以苛刻的挑賜，其間還大杯大杯地暢飲私造的威士忌酒，興致勃勃地胡亂開一陣心。
  2. In chapter 4, a simulation approach is presented, which combines the outdoor radio propagation model, the eigen - driven patterns of handset diversity antenna with two feed ports and combining schemes of receiving signals, to investigate the performance of a dual antenna handset under co - channel interference ( cci ) and multi - path fading environment

    第四章首先用本徵激勵方向圖的概念來產生手機雙埠分集天線的接收信號矢量，然後將其與城市室外電波傳播模型、分集合併方式相結合，建立了分析在具有共道干擾和多徑衰落環境中手機雙天線系統的性能模型。
  3. When the aerials are down, and your spirit is covered with snows of synicism and the ice of pessimism, then you are grown old, even at 20, but as long as your aerials are up, to catch waves of optimism, there is hope you may die young at 80

    然而，當你心靈中的電臺天線墜落，憤世嫉俗悲觀絕望的冰雪覆蓋了你的靈魂時，你就衰老了-即使你只有20歲，但只要你心靈中的電臺天線始終挺立，捕捉著生命中樂觀的電波，那麼，你就有希望死於耄耋之年而仍然年輕。
  4. 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
  5. Simulation results show that abf - csma / ca protocol can realize space - division - multiple - access ( sdma ) and provide very high channel utilization. chapter 3 considers employing smart antennas in the central access point ( cap ) of wireless internet access networks

    第三章研究了智能天線在internet無線接入網路中的應用，主要考慮使用智能天線對抗同通道干擾與多徑衰落，增加覆蓋范圍，並在mac層實現智能天線與網路的有機結合。
  6. The simulation results based on siso and mimo systems show that the proposed scheme could effectively eliminate the time - variant fading characteristics of wireless channel and under an acceptable demand of ber, the frequency efficiency is enhanced greatly and besides, dynamic encoding is implemented with low complexity and high efficiency

    通過在單天線和多天線系統中的模擬，表明該方案可以有效的克服無線通道的時變衰落特性，在滿足誤碼率性能要求的基礎上可以提高系統頻譜利用率，且實現復雜度低。
  7. Multibeam base - station smart antennas are discussed in this paper. we analyze the outage probability of mobile communication system suffering both fast fading and shadowing by means of statistical propagation model, and contrast the case that adopt multibeam smart antennas to the case that adopt omnicase. the results emulated by computer show that the outage probability of mobile communication system will diminish as the increasing of the number of beams using smart antennas no matter when suffering a single co - channel interfence or six ones

    研究了移動通信環境下的多波束智能天線，並基於統計傳播的同通道干擾模型，分析了快衰落及慢衰落情況下未採用多波束智能天線與採用多波束智能天線時的中斷率，並進行了比較.計算機模擬結果表明：採用多波束智能天線，不論在單個同通道小區還是多個同通道小區情況下，系統的中斷率將隨著波束數的增大而降低
  8. In current communication system, the application of dual - band dual - polarized antenna satisfies the needs of communication system ’ s upgrade, solves the problem of multipath fading, reduces the number and lowers the cost of the antennas

    在現代通信系統中，雙頻雙極化天線的應用能夠滿足通信系統的不斷升級的要求，能有效解決多徑衰落問題，能減少天線數量、降低天線成本。
  9. Researches on the space - time code have been under the assumption of independent fading and perfect channel state information. but in a realistic system, the above assumption is very difficult to be acquired. based on this, the performance of space - time code under correlated rayleigh fading channel and rician fading channel is studied in thispaper

    在實際的傳播環境中，不同天線上的信號的衰落在空間上存在相關性，研究了瑞利相關衰落通道的空間相關性對空時編碼性能的影響以及相關萊斯衰落通道下空時編碼系統的性能，以期推動空時編碼在無線通信系統中的實際應用。
  10. Space - time coding technology is based on multi - elements antenna array and has strong points of both time processing and space processing. it can satisfy the requirements of high data rate transmission in the future radio mobile system without the increase of the transmitting power and the spread of the frequency. and it can greatly improve the quality of communication services and system capacity under fading channels

    空時編碼技術是一種利用多天線陣發送和接收的技術，該技術能很好地結合時間處理技術和空間處理技術的特點，能在不增大發射功率和不擴展頻帶的前提下滿足未來無線移動通信對高數據率傳輸的要求，從而全面提高衰落通道的通信質量和通信系統容量。
  11. Space - time coding technique is a coding technique which is applied in mimo system. it correlates to multiple antennae and signals transmitted in different periods in temporal and spatial domains, which enable the receiver can overcome fading over mimo channel and reduce error code transmitted

    空時編碼是一種用於mimo系統的編碼技術，該編碼在多根發射天線和各個時間周期的發射信號之間能夠產生空域或時域的相關性，這種空時相關性可以使接收機克服mimo通道衰落和減少發射誤碼。
  12. Much reference of the algorithms and models can be got from the performance results for the practical design and layout. system - level simulation of hsupa builds the integrated platform and key models to describe and simulate the common structure and features of the radio network, including cell layout, path gain, traffic model, power control, handover, etc., also the special ones of hsupa, including mac - es / e, node b controlled scheduling, harq, shorter tti, etc.

    所謂hsupa系統級模擬就是要搭建系統級的模擬平臺，對無線網路的公共結構和特性（例如小區布局，傳播模型，衰落通道，天線模型，功率控制，切換， ue的分佈和移動，業務的建立終止和中斷等）和hsupa的專有結構和特性（ mac - es / e ， nodeb控制的調度， harq ，更短的tti ）進行描述和建模。
  13. Among the non - coherent transmit diversity technologies, differential transmit diversity is a remarkable technique. in this thesis we consider the combining diversity of the differential transmit diversity and receive diversity. the potential of space diversity was discussed and the error performance of combining diversity system was investigated

    本論文採用聯合分集的方式將差分發送分集技術與接收分集技術相結合，進一步探討了空間分集在抗衰落方面的潛力，並對基於聯合分集技術的多天線通信系統進行了研究。
  14. Because using ofdm, a frequency - selective fading channel can be transformed into multiple frequency - flat fading sub - channels, in the coding process, spatial diversity ( due to multiple antennas ) is integrated with frequency diversity ( due to delay spread ), therefore, the proposed code can provide higher diversity gain than space - time code alone

    該編碼利用正交頻分復用把頻率選擇性衰落通道變換成平衰落通道的特性，同時引入了基於多天線的空間分集和基於時延擴展的頻率分集，比空時編碼具有更高的分集增益。
  15. 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。
  16. And the orthogonal frequency division multiplexing ( ofdm ) is given more and more attention in wireless area, because ofdm lessens the severe effects of frequency selective fading and improves the spectrum efficiency, and this technology has been indicated to become a key technology in the fourth moving communication

    其中ieee802 . 11a協議中使用到的ofdm （正交頻分復用）技術，由於其先天具有抗多徑衰落及頻譜使用率高等特性，成為當代無線通信領域研究的熱點，並預示著為第四代移動通信的關鍵技術。
  17. Among the effective methods to mitigate the fading in wireless communications is transmit diversity, which can utilize the space diversity of transmit antennae to generate the receive diversity and improve the performance of the forward link

    發送分集技術是對抗無線通道衰落的重要手段，它能將發送天線的空間分集轉化為接收機可以利用的分集方式，以改善前向鏈路的性能。
  18. In this part, the two anterior chapters mainly discuss the various basic theories used by the designing for the propagation paths of the electric wave. the theories include the computation methods for the fade and the loss of various propagation paths and obstructions, the engineering estimation methods of the flat fading and frequency selected fading, the designing methods of space diversity and frequency diversity, etc. at the same time, the special designing method of the sea - across path is discussed in detail

    本文首先闡述了微波中繼通信工程設計中的相關知識，其中前兩章主要論述了線路設計中所用到的種種理論基礎知識，包括對于各種路徑情況、障礙情況的衰落與損耗的不同計算方法，平衰落與選擇性衰落中斷率的估算方法，天線分集和頻率分集技術的理論知識和設計方法等等。
  19. The key technologies for 3g include multi - user detection, adaptive antenna, rake receive, power control and so on. these key technologies complement each other and all of them are the focus of present research

    Cdma通信系統的關鍵技術包括有抗干擾（多用戶檢測） 、抗多徑衰落（天線分集和rake接收） 、抗遠近效應（功率控制）等，而它們之間又是相輔相成、互相補充的，均為當前研究的熱點。
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