flat fading channel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 - 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(huì)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(duì)平坦衰落信道下mimo檢測(cè)技術(shù)研究的基礎(chǔ)上,本文展開了對(duì)頻率選擇性信道下mimo檢測(cè)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。 - 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(duì)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(jiǎn)輔助矢量預(yù)編碼等算法。 - It's difficult to find flat fading channel in a sentence. 用flat fading channel造句挺難的
- 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(shí)格碼把空間分集、時(shí)間分集和前向糾錯(cuò)編碼聯(lián)合設(shè)計(jì)，以n摘要獲得最大的空間分集、時(shí)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(duì)自適應(yīng)調(diào)制系統(tǒng)中的信道估計(jì)問題難點(diǎn)，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(jì)和最大后驗(yàn)概率( map )估計(jì)算法，針對(duì)平衰落信道，我們仿真了map估計(jì)和ml估計(jì)的方差與導(dǎo)頻符號(hào)長(zhǎng)度的關(guān)系，仿真結(jié)果表明，錯(cuò)誤方差受多譜勒頻率的變化影響最大，并且對(duì)實(shí)際的自適應(yīng)調(diào)制系統(tǒng)，導(dǎo)頻符號(hào)長(zhǎng)度的取值超過20個(gè)符號(hào)長(zhǎng)度時(shí)， map信道估計(jì)明顯優(yōu)于ml信道估計(jì)。 - 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(jì)算復(fù)雜度也會(huì)隨之增大，因而給出這個(gè)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(cè)器用來(lái)解決平坦衰落信道下的聯(lián)合信道估計(jì)和檢測(cè)問題，并通過仿真證明了我們提出的新檢測(cè)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(duì)于平坦衰落信道下的mimo檢測(cè)技術(shù)的研究已較為成熟,本文首先對(duì)其中三種具有較高實(shí)用性的算法進(jìn)行了綜述和仿真研究,其中包括迫零檢測(cè)、 v - blast檢測(cè)和格約簡(jiǎn)輔助檢測(cè)三種算法。 - Adaptive modulation mainly include several problem for example signal shape , channel estimation , all digital receiver and so on . since the channel referring to adaptive modulation is very hostile in wireless transmission channel , its algorithms and architectures used for the modulation and demodulation should be carefully devised and considered . designing appropriate algorithms and architectures of the adaptive modulation are main research goal of this paper to meet the need of flat fading channel and selective fading channel
自適應(yīng)調(diào)制技術(shù)主要包括信號(hào)成形、信道估計(jì)和檢測(cè)、全數(shù)字接收等方面的問題，由于自適應(yīng)調(diào)制所涉及的信道是非常惡劣的無(wú)線傳輸信道，其調(diào)制與解調(diào)的算法和結(jié)構(gòu)必須加以精心的設(shè)計(jì)和考慮，針對(duì)具體所假設(shè)的平衰落和選擇性衰落的無(wú)線信道情況來(lái)設(shè)計(jì)自適應(yīng)調(diào)制系統(tǒng)的算法和結(jié)構(gòu)是本文研究的主要方向。 - With the downlink simulation model constructed , performance of wideband cdma under different radio propagation environment and vehicular speed is simulated . based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts , performance of multicarrier cdma system with go sequences under different radio environment is investigated
基于多載波直接序列碼分多址在乎坦衰落信道中序列偏移小于1個(gè)碼片及在頻率選擇性衰落信道中偏移任意個(gè)碼片的系統(tǒng)模型，本文還分析了采用廣義正交序列的多載波碼分多址系統(tǒng)在不同無(wú)線傳播環(huán)境下的性能。