pilot channel system 中文意思是什麼
pilot channel system
解釋
引導通道方式-
And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results
接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。 -
In this paper, we discuss the principle of mimo - ofdm system based on the introduction of fading channels. furthermore, the channel estimation technique in mimo - ofdm system is investigated, with the emphasis on training sequence - based and pilot - based channel estimation methods, and also several basic and improved algorithms are given respectively. finally, the analysis and comparison of these algorithms is made by computer simulation
本文在分析移動無線通道衰落特性的基礎上，闡述了mimo - ofdm系統的基本原理，並圍繞該系統中通道估計這一關鍵技術，深入研究了基於訓練序列和基於導頻符號的兩類通道估計方法，給出幾種相應的通道估計演算法以及它們的改進演算法，最後結合matlab模擬對這些演算法的有效性和可行性進行了全面地分析與比較。 -
Abstract : in this paper, an orthogonal multicode wideband cdma system modelincluding pilot channel based on chaos spreading sequences is given. based on chaos sequences, with pilot channel inserted orthogonally, it is shown that the performance of the system is improved. the performance of the system in fading channel is analyzed
文摘:提出一種基於混沌序列含導頻信號的寬帶正交多碼cdma系統模型，利用混沌序列以及採用正交插入導頻信號提高系統性能，並對此模型在衰落通道中的性能進行分析。 -
( 3 ) a blind channel estimator based on the aid of pseudo - pilot - symbols ( pps ) is proposed in term of the two characters of ofdm system : the finite alphabet property of information symbols and independent property between subchannels
（ 3 ）利用ofdm系統傳輸的信息符號為有限字符集和各子載波的相互獨立特性，提出了用偽導頻符號（ pps ）進行通道的盲估計演算法。 -
The principle and characteristics of ofdm system are introduced first. then several key technologies of channel estimation and equalization for ofdm are discussed in detail, including pilot signal based channel estimation methods, cyclic prefix based channel estimation method, frequency domain adaptive filtering method and time domain equalization method for long channel impulse. the corresponding comparison and simulations are also provided
文中討論了利用導頻信號的通道估計方法，利用循環前綴進行通道估計的方法， ofdm信號均衡中自適應濾波技術，及通道沖擊響應長于循環前綴時利用時域均衡減少解調器輸入信號拖尾長度的方法，分析了這些方法的原理，並通過計算機模擬驗證了這些方法的性能。
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