degraded channel 中文意思是什麼
degraded channel
解釋
降質通道-
Many of communication systems take the convolutional code and viterbi algorithm as the channel coding scheme. the viterbi algorithm decoding is a kind of maximum likelihood decoding, and its performance is good over additive white gaussian noise ( awgn ) channel, but when burst errors occur, the decoding performance may be greatly degraded
維特比譯碼演算法是最大似然譯碼，在由高斯白噪聲引起的隨機錯誤的通道中有良好的性能，但當通道錯誤集中或為突發錯誤通道時，維特比譯碼演算法則性能急劇下降。 -
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。 -
In order to investigate the effect of high - field hot - carrier on devices and circuits, the electrical stress experiment is carried out with 1. 2 n m, 1. 0 n m and 0. 8 u m channel length home - made mosfet ' s by the monitor system with ate and cat technology. by using the fresh and degraded experiment data, bsim2 model parameters are extracted
為了分析研究高場熱載流子效應對器件和電路特性可靠性的影響，採用自動測試與cad技術相結合的監測系統，對國內溝道長度1 . 2 m 、 1 . 0 m和0 . 8 m的mosfet進行了電應力退化實驗，並根據實驗結果提取了退化前後器件的bsim2模型參數。 -
Third, the upheaval of yakou vault produced a serial of radial tensile fractures which located xm right - bank side, thus, degraded the rock mass structure of right - bank. fourth, the intersection and convergence of all these fractures formed a fracture net which served as good channel for all kinds of weathering forces, especially ground water, enter into deep inner part of rock mass
結果顯示，四種分級指標之間具有較好的相關性，巖體質量z分級和其他的三種方法呈指數關系， rmr和水電圍巖工程地質分級方法呈線性關系，而水電圍巖工程地質分級與工程巖體分級方法則呈對數關系。 -
In cellular envirorunents, because of the influence of several adverse factors, such as muitipath, non - line - of sight propagation, noise, interference and channel frequency characteristics, radio statistics measuremenis like tdoa, toa and aoa related to mobile position, the performance of location algorithms mny be significantly degraded and the position estimation of ms is inevitably biased
在蜂窩網路環境中，由於受多徑、非視距傳播、噪聲、干擾和通道頻率特性等多種不利因素的綜合影響，使tdoa 、 toa 、 aoa等與移動臺位置有關的電波特徵測量值不可避免地出現較大誤差，從而使各種定位演算法的性能顯著下降，造成移動臺位置估計出現較大偏差。
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