flat fading造句
例句與造句
- Autoregressive modeling for flat fading channel simulation
模型的平坦衰落信道仿真 - Mimo ; order statistics ; flat fading ; gamma distribution
Mimo順序統(tǒng)計量平坦衰落gamma分布 - Statistical distributions of mimo channels over flat fading
平坦衰落mimo信道的能量統(tǒng)計特征分析 - When transmitting signal is below 500 kbps , increasing the system power can reduce the bit error rate ( ber ) for the signal suffering only flat fading
當(dāng)碼速率較低時( 500kbps以下) ,信號受到平坦衰落,增大系統(tǒng)功率可以降低系統(tǒng)誤碼率。 - Subsequently the channel was modeled for three types namely additive white gaussian noise , flat fading and frequency selective fading . lastly , the receiver was studied
接下來信道建模成三種不同的類型，即加性高斯白噪聲信道、平坦衰落信道和頻率選擇性衰落信道。 - It's difficult to find flat fading in a sentence. 用flat fading造句挺難的
- If the assigned spreading codes are orthogonal and signals are transmitted through a flat fading channel , there will be no multiple access interference ( mai )
如果所有用戶采用理想正交擴(kuò)頻碼并且通過同步平坦衰落信道，系統(tǒng)中將不會存在多址干擾( mai : multipleaccessinterference ) 。 - Based on the research of mimo detections under the flat fading channel , this paper focuses on the mimo detection under the frequency selective fading channel , chiefly aiming at the lll detection algorithm
在對平坦衰落信道下mimo檢測技術(shù)研究的基礎(chǔ)上,本文展開了對頻率選擇性信道下mimo檢測技術(shù)的研究。 - While this dissertation will use wavelet analysis to decompose fading - process , and provide wavelet model of flat fading channel , then propose a new blind receiver based on monte carol algorithm
本文將平衰落信道的衰落過程進(jìn)行小波分解與建模，在此基礎(chǔ)上提出一種采用順序蒙特卡羅算法的盲均衡接收機(jī)，并給出了仿真結(jié)果以證明此接收機(jī)的優(yōu)異性能。 - And the most advantage of ofdm is that it can convert high - rate data stream into the low - rate and reduce data bandwidth so that multi - path - fading can be transformed into flat fading in wireless circumstance
這種調(diào)制技術(shù)的最大的好處就是將高速的數(shù)據(jù)流，變換成并行的低速數(shù)據(jù)流，減小了數(shù)據(jù)帶寬，從而可將無線環(huán)境中的多徑衰落(頻率選擇性率落)轉(zhuǎn)換成平坦衰落。 - Then this paper makes some overview and simulation on the application of three precoding algorithms under the flat fading channel , which are linear preequalization , tomlinson - harashima precoding ( thp ) and lattice reduction - aided ( lll ) vector precoding
本文對三種常見的預(yù)編碼算法在平坦衰落信道下的應(yīng)用進(jìn)行了綜述和仿真研究,包括迫零線性預(yù)均衡、 thp預(yù)編碼和格約簡輔助矢量預(yù)編碼等算法。 - To verify their effectiveness , simulation studies are conducted to test the performance of the proposed turbo codes in awgn channels and flat fading channels . in these simulations , the modified max - log - map decoding algorithm and the golden - spread interleaver are applied
仿真研究了采用優(yōu)選擴(kuò)散交織與改進(jìn)的max - log - map譯碼算法的turbo碼在加性白高斯噪聲( awgn )信道以及平衰落信道上的性能。 - The fourth part considered how to improve system performance by adopting transmission diversity in flat fading channels . in the traditional space - time trellis code design , the space diversity , time diversity and channel code are concerned together to get best space diversity , time diversity and code gain
傳統(tǒng)的空時格碼把空間分集、時間分集和前向糾錯編碼聯(lián)合設(shè)計，以n摘要獲得最大的空間分集、時間分集、信道編碼的增益。 - 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(yīng)調(diào)制系統(tǒng)中的信道估計問題難點，詳細(xì)推導(dǎo)了平衰落信道條件下和選擇性衰落信道條件下最大似然( ml )估計和最大后驗概率( map )估計算法，針對平衰落信道，我們仿真了map估計和ml估計的方差與導(dǎo)頻符號長度的關(guān)系，仿真結(jié)果表明，錯誤方差受多譜勒頻率的變化影響最大，并且對實際的自適應(yīng)調(diào)制系統(tǒng)，導(dǎo)頻符號長度的取值超過20個符號長度時， map信道估計明顯優(yōu)于ml信道估計。 - The basic idea of this method is to produce particles from the posterior densities , and these weighted samples provide approximations to the densities . in this dissertation , sequential monte carlo method and its applications in communication are investigated . firstly , its basic idea , method and improved method are introduced , then induce the bound of particles , which determines the performance of the system , and the more particles are chosen , the higher computation is done , finally , a new detector based on new importance function is proposed , which deals with the joint channel estimation and detection in flat fading channels
首先介紹了它的基本思想、基本方法、及當(dāng)前研究現(xiàn)狀；在此基礎(chǔ)上推導(dǎo)出樣本數(shù)選擇的界，樣本數(shù)的選擇決定了系統(tǒng)的性能，但是若選的太多，計算復(fù)雜度也會隨之增大，因而給出這個界是十分有意義的；最后提出了一種基于新的重要函數(shù)的檢測器用來解決平坦衰落信道下的聯(lián)合信道估計和檢測問題，并通過仿真證明了我們提出的新檢測器的有效性。 - At present , the research on the mimo detections under the flat fading channel has been maturational . this paper firstly overviews and simulates three practical mimo detections , which are zero - forcing ( zf ) algorithm , v - blast algorithm and lattice - reduction aided ( lll ) detection algorithm . the simulation results suggest that lll algorithm has apparent advantages over other two detection algorithms
目前,對于平坦衰落信道下的mimo檢測技術(shù)的研究已較為成熟,本文首先對其中三種具有較高實用性的算法進(jìn)行了綜述和仿真研究,其中包括迫零檢測、 v - blast檢測和格約簡輔助檢測三種算法。
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