pilot channel 中文意思是什麼
pilot channel
解釋
導流河槽-
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。 -
Automatic pilot channel
自動引出通路 -
In this modified algorithm, channel estimation is made by dispreading the received signal of dpcch with a corresponding long gold sequence and pilot ovsf, followed by averaging
本文將dpcch中的導頻信號解擾、解擴，再將它們與已知導頻信號相乘得到的通道估計值進行平均，從而得到最終的通道估計值。 -
The estimation of frequency offset is based on pilot symbols and non - pilot symbols. this paper also discusses some parameters in the method and gives the way of compensation. to get the estimation method of doppler spread width, we model the rayleigh channel based on the conclusion of gans ’ spectrum analysis based on clarke model
其中頻偏估計採用一種基於導頻符號和去極性非導頻符的方法進行估計，並通過試驗環境驗證了此方法，並確定了這個方法中的參數的取值，在此基礎上介紹了本系統中的頻偏補償方法。 -
Space - time channel estimation for ofdm systems based on comb - type pilot arrangement
系統中基於梳狀導頻的空時通道估計 -
Section 4 researches on pilot symbol aided space - time 2d rake receiver in rayleigh fading channel. two kinds of 2d - rake receivers are proposed, one is the interference zeros force 2d - rake receiver ( zf - 2drake ). simulation results reveal zf - 2drake has the better performance than the conventional 2d - rake receiver
研究了rayleigh通道下2種導頻輔助的空時2d - rake接收機結構:干擾置零2d - rake接收機（ zf - 2drake ）和基於空時通道估計的時空級聯2d - rake接收機（ spce - 2drake ） ，推導了它們的誤碼率性能。 -
Zhejiang 8 amounting to tunnel engineering limited company is alley of well of bridge of road surface of channel of pilot a ship into a harbour of water and electricity of volume road tunnel, railroad channel, irrigation works, roadbed, mine, large cubic metro of earth and stone blow up the professional construction company that construction is an organic whole, have channel highway project to always contract two class aptitude
浙江八達隧道工程有限公司是集公路隧道、鐵路隧道、水利水電引水隧道、路基路面橋梁、礦山井巷、大型土石方爆破施工為一體的專業施工企業，擁有隧道公路工程總承包貳級資質。 -
Based on piecewise linear model, this paper proposes an estimation method that first estimates the slope of linear variant and the channel impulse response at the middle time of the current ofdm symbol using pilot sequences, and then estimates the whole channel impulse response through the estimated parameters
該演算法首先利用導頻序列估計出當前ofdm符號間隔內通道線性變化的斜率和中間時刻通道的沖激響應值，然後根據線性模型利用估計出的參數得到當前符號間隔內所有時刻上的通道沖激響應。 -
The main works and innovations of this thesis are as follows : ( 1 ) based on the oversampling of ofdm frequency response, this paper proposes a channel estimator which combines the comb - pilot - tones partitioning and the fourier transform with the same pilot symbol samples
具體而言，主要有以下六個方面的工作和創新點： （ 1 ）利用在ofdm系統中通道的頻域響應是過采樣的特性，提出了在頻域內用均勻梳狀分佈的導頻符號和與導頻符號數相同點的傅里葉變換相結合的通道估計方法。 -
And also the paper researches on the two - dimensional pilot - symbol - aided channel estimation, analyzes and realizes the methods that one is realized by the discrete shift - variant 2 - d wiener filter, and the other is realized by the two cascaded orthogonal 1 - d wiener filter
分析了時頻二維通道估計方法和兩個級聯的一維通道估計方法，並對這兩種方法加以實現，最後給出了相應的實驗結果。 -
Based on the analysis of above study and the traditional experience, it concludes systemic pilot method under different conditions and also presents the guarantee measures. the bridge limits the height and breadth of channel, some measures and regulations of the safety management are necessary for the developed dependability
由於橋梁的架設限制了船舶通航的高度和寬度，因此在此提出保障船舶在橋區安全航行應建立的各種保障措施和航行安全管理規則等，以提高船舶過橋航行的安全可靠性。 -
In this thesis, several approaches are studied, including optimal parametric feedforward estimation of fading channels, basis expansion for estimation and equalization of channels, channel estimation based on pilot and data traffic channels and channel estimation using linear interpolation
針對這個問題，本文研究了各種時變衰落移動通信通道的估計與均衡的方法，包括非盲估計的方法、線性內插的方法、基展開的非盲方法和衰落通道最優前饋參數估計的方法。 -
In chapter 3, a based on pilot symbols channel estimation method and its simplifiede method are discussed in detailed. in this chapter we bring forth a method that is fit to the extremely fading channels
第三章介紹了一種基於導引符號的mimo - ofdm系統的通道估計方法及其改進型方法，同時提出了一種適合於極端衰落通道條件下的基於導引符號的通道估計方法。 -
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。 -
Secondly, the dissertation proposes a novel blind symbol - timing scheme for ofdm systems based on cyclostationarity feature of received symbols. the proposed schemes also exploits the periodicity of ofdm symbol introduced by cyclic prefix, by applying 2 - dimentional fourier transformation and choosing the appropriate correlation peak value as the symbol start location, the precision of this scheme is higher than previous conventional method. thirdly, the dissertation presents analysis with regard to channel estimation of ofdm systems. several interpolation algorithm in ofdm systems which based on pilot sequence have been analyzed in the first instance, and the influence of the channel noise on interpolation precision has discussed. the theoretic analysis and simulation results show that : the interpolation error induced by the precision of interpolation procedure itself has out weight
第三，論文在ofdm系統的通道估計方面，先對基於導頻的ofdm通道估計中的多種插值方法進行了分析，討論了噪聲對插值精度的影響，指出插值本身的精度所造成的插值誤差遠大於噪聲所帶來的插值誤差，從而階次更高的插值演算法在實用中並非最優的;並指出插值濾波法比變采樣率演算法對噪聲的影響更為敏感，在信噪比較高時插值濾波演算法比變采樣率演算法更優。 -
The aim of this paper is to investigate the problem of pilot - assisted channel estimation in downlink mc - cdma
本文主要研究了mc - cdma下行鏈路中的基於導頻信號的通道估計。 -
Two categories of pilot based channel estimation are examined in chapter 3 : ml criteria based and mmse criteria based. the performance and implementation complexity of these two methods are analyzed and compared
給出了最大似然估計及最小均方估計的通道響應估計表達式，分析和比較了這兩種估計方法的性能，實現復雜度。 -
In this thesis, we also study the adaptive algorithm of mmse and put forward the adaptive algorithm based on the pilot channel. based on the sub - spatial algorithm, we analyze the blind algorithm and improve it by the part of the channel estimation
本文還研究了基於mmse檢測器準則的自適應演算法，提出了基於導頻通道的自適應演算法，分析了基於子空間方法的盲演算法，並在通道估計部分改進了基於信號子空間的演算法。 -
Increase of unnecessary handoff and unbalance of the teletraffic among different cells. using fuzzy mathematical idea, the thesis proposes a fuzzy pcs ( ffcs ) algorithm, which takes into account of three main factors, i. e. the signal strength of common pilot channel ( cpich ), t
本論文綜合考慮了公用導頻通道（ cpich ）的信號強度、蜂窩的呼叫到達率和基站的可用功率三個主要因素，借鑒模糊數學思想，提出了一種模糊fcs （ ffcs ）演算法，並通過模擬對軟切換、 fcs和ffcs進行了性能比較。 -
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。
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