propagation channel 中文意思是什麼
propagation channel
解釋
傳播通道- propagation : 持續培養
- channel : n 1 水路，水道，渠，溝；海峽；河床，河底。2 （柱等的）槽，凹縫；【機械工程】槽鐵，凹形鐵。3 〈比...
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The thesis analyzes the transmitting characteristic of the uwa channel, derives the propagation losses, eigenrays and channel impulse responses of uwa channel by use of the kraken normal wave mode and the ray trace algorithm based on velocity - depth curvilinear profile approximation. based on the analysis, a scheme of auto - replying lduwarc system by means of spread spectrum technique has been designed
論文首先分析了遠程聲遙控通道傳輸特性，分別利用kraken簡正波和射線跟蹤模型對深海和淺海水聲通道的傳輸特性進行分析，對通道的多徑結構、衰落和環境噪聲進行了計算，並在此基礎上設計了基於擴頻技術的自主應答式遠程聲遙控系統方案。 -
The general nonlinear propagation equations of four - lightwaves in birefringent fibers are deduced. the characteristics of polarization mode dispersion in 4 + 10gb / sdwdm system in dispersion - flattened fibers is studied. our results show that pmd exerts a detrimental influence on 4 x logb / sdwdm system in limiting transmission rate and the channel numbers
本論文研究波分復用（ wdm ）系統中偏振模色散的影響，主要工作包括下面兩個部分：一、導出了四波長光波在雙折射光纖中傳輸所滿足的一般非線性耦合方程；在此基礎上，研究色散平坦光纖中4 10gb sdwdm系統的偏振模色散特性，並且進一步研究了偏振模色散對不同通道間隔的4 10gb sdwdm系統的影響。 -
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。 -
In wireless communication, the relative movement between the transmitter and the receiver may cause the change of the electromagnetic wave propagation path, thus makes the channel become a random time - variety channel
在無線通信中，發射機和接收機之間的相對移動會造成電波傳播路徑的改變，從而使通道變成隨機時變通道。 -
In addition according to the comparison of typical floods the impact of floodplain morphology to the flood propagation was studied. no continuous water body in main channel and floodplain and the change of floodplain morphology and the increased flood detention capacity caused the time of flood propagation increasing and the flood types changing in abnormally
同時通過對典型洪水的對比分析，研究了灘地邊界條件對洪水運行的影響，認識到由於主槽與灘地水體不連續以及灘地地形的改變，灘地蓄洪能力增大，造成洪水傳播時間增長和洪峰峰型的異常變化。 -
Chapter 2 : characteristics of propagation of ultra - intense laser beam in a partially stripped preformed plasma channel is discussed, in which the relativistic self - focusing effects, together with the perturbed plasma density, is discussed
第二章：本章闡述了超強激光光束在拋物型部分電離的預等離子體（聚焦和散焦）隧道中的傳輸特性。研究了相對論自聚焦效應和等離子體波引起的密度擾動對傳輸的影響。 -
The envelope equation of laser propagating in the plasma channel, and the general expression related the laser spot size with the propagation distance and the width of the plasma channel etc., are derived based on the hamilton - jacobi equation and the refractive index equation
在此基礎上得到了激光在等離子體隧道中傳輸的包絡方程以及光斑半徑與傳輸距離、隧道寬度等初始參量的關系。 -
In the third chapter, it was particularly analyzed the impact of the correlation between antenna arrays both sides of transmit and receive, the coexistence of line of sight ( los ) component and scatter power component in the radio propagation environments, and known and unknown channel state information on the capacity of mimo channel. the related simulation results are also given
第三章著重分析了收發兩端的多天線單元之間存在相關性、同時存在直射分量（ los ）和散射分量的傳播環境、已知和未知通道的狀態信息等因素對mimo通道容量的影響，給出了有關模擬結果。 -
In order to achieve high data rates on the severely band - limited underwater acoustic ( uwa ) channels, bandwidth - efficient modulation techniques must be employed, together with some sophisticated signal processing algorithms, such as adaptive equalization technique for the intersymbol interference caused by channel multipath propagation
在帶寬嚴重受限的水聲通道中實現高數據率通信，必須使用高帶寬利用率調制技術，並結合自適應均衡等技術以有效地克服通道多途傳播產生的符號間干擾。 -
The conditions for the long distance propagation are discussed in detail. the results are useful in determining the appropriate size of the channel to be preformed and can guide the future research in ultrashort intense laser propagation
首次利用自恰電子空腔效應分析了超短超強激光在低密度等離子體中的長距離傳輸和自聚焦效應，詳細分析了長距離傳輸的條件。 -
Research of error resilience technology for video communication based on h. 263 codec major : signal and information processing data : author : meng yan signature : tutor : zhang erhu liu shichang signature : abstract the reconstructed image quality can be degraded substantially by errors during the transmitting over the communication channel, especially when the video is compressed by temporal and spatial coding ways, which leads to error propagation in frame sequence, so the error resilience procedure should be performed to improve the reconstruction quality
由於通信系統的通道不可避免的存在噪聲，傳輸數據流必然存在誤碼。對于h . 26x的視頻編碼流，由於空域和時域的壓縮方法以及熵編碼方法的應用，即使是一個比特的錯誤，常會影響一個區域的圖像不能正確解碼，同時錯誤的圖像還會擴散影響后續數幀圖像。因此有必要在標準解碼程序的基礎上，添加容錯功能。 -
Being utilized in the wave propagation for nan gang of yangtze river estuary, this model can give good results of numerical simulation by effectively reflecting the influence of complicated topography which is comprised of shoal - channel spaced in between
將模型應用於地形復雜變化的長江口南港水域內波浪場的計算，計算結果說明，模型能較好地反映灘槽相間、急劇變化的地形的影響。 -
The thesis analyzed the effects, associated with the propagation of laser in plasma channel, such as diffraction, plasma defocusing, the third - order intensity - dependent nonlinearity, the relativistic self - focusing, the focusing and defocusing of the plasma channel, and the absorbtion in the collision plasma and the finite pulse length effect
文中用哈密頓-雅可比方程方法和源展開方法分別對激光在等離子體隧道中傳輸所涉及的衍射效應、等離子體散焦效應、三階強度非線性、相對論自聚焦、等離子體隧道的聚焦和散焦效應、碰撞等離子體中的吸收效應、有限脈寬效應等等做了基本的闡述。 -
Underwater acoustic communications ( uwa ) are made difficult by the combined effect of multipath propagation and high temporal and spatial variability of the channel conditions. the fading which was caused by multipath propagation was one of the main factors influencing the performance of underwater acoustic communication systems
水聲通道中廣泛存在的多徑傳播效應是水聲通信所面臨的主要障礙之一，由多徑所產生的信號衰落效應是影響水聲通信系統性能的主要因素之一。 -
The propagation characteristics of underwater acoustic channels and their influences on long - range information transmission are studied thoroughly. based on the sonar equation, the optimal frequency band is abtained. from the calculation about transmission loss, the source level is forecasted. based on the random time varying channel theory, the fading characteristics of long - range underwater acoustic channels are analyzed
系統、深入地研究了水聲通道特性及其對水聲遠程信息傳輸系統的影響；從聲納方程出發，確定了系統的最佳工作頻段；在聲傳播損失計算的基礎上，給出了聲源級的預報；基於時變通道理論，描述了遠程水聲通道的衰落特性。 -
But the traditional adaptive equalizers need periodically retrained, because the underwater acoustic channel is a stochastic time - varying channel. although the traditional adaptive equalizer increase the reliability of the propagation, the rate of it is decreased. so they are not very applicable in the field of the propagation of high rate signals through an underwater acoustic channel
但是由於水聲通道的隨機時變性，傳統的均衡技術需要周期性的發送收端已知的訓練碼來跟蹤通道的變化，這樣做雖然提高了數據傳輸的可靠性，但是系統的重復訓練大大的降低了通信效率，在水聲通道高速率數據傳輸中並不適用。 -
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。 -
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傳輸特性，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、多普勒頻移、傳播噪聲、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。 -
As we all know, the capability of wireless communication system is constrained by radio propagation channel, especially for future wideband communication system. so it needs more signal processing techniques to withstand bad radio propagation environment, such as diversity combination, coherent detection and channel encoding and decoding etc. for mimo physical layer approaches, channel state information is a prerequisite, thus comes many channel estimation approaches and algorithms
無線通信系統的性能主要受到移動無線通道的制約，特別對未來的寬帶移動通信系統更需要採用很多信號處理技術來對抗惡劣的無線傳播環境以提高系統性能，比如常見的分集合併、相關檢測和通道編解碼技術等，而採用這些技術的前提就是要知道通道的狀態信息（ csi ） 。 -
Moreover, the performance of the single - cell s - cdma system employing go sequences under the multi - path propagation channel is analyzed, resulting analytical sir expressions, the numerical and simulation error results, for rayleigh and rice fading channels respectively
此外，本文還對多徑傳輸條件下採用go序列擴頻的單小區s - cdma系統性能進行了理論分析，給出了瑞利、萊斯衰落通道條件下sir表達式以及誤碼性能數值計算和模擬結果。
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