selective channel造句
例句與造句
- It combines the advantages of ofdm and cdma . it can convert the frequency selective channel propagation of the broadband to flat channel of the subcarrier
它結(jié)合了ofdm和cdma技術(shù)的優(yōu)點(diǎn)，能夠把寬帶頻率選擇性衰落轉(zhuǎn)化為每子載波的平坦信道。 - The protoplasts of arabidopsis were isolated and the voltage - dependent k + - selective channels in the plasma membrane were recorded by whole - cell configuration
O 。的產(chǎn)生部位。我們分離了擬南芥保衛(wèi)細(xì)胞原生質(zhì)體并記錄在不同處理?xiàng)l件下全細(xì)胞內(nèi)向k ”電流的變化情況。 - Causes small transmission delay , but computation is complex . the other is called dsova , which does not need to know csi , with low - computation complexity and small transmission delay , and is more suitable in the case when side information is unknown . these two algorithms effectively combine the ofdm technology and the sova algorithm in rayleigh channel , resulting in an efficient sova decoding under frequency - selective channel
另一種是不含信道估計(jì)的差分sova算法(簡(jiǎn)稱dsova ) ，該算法不必知道csi ，計(jì)算復(fù)雜度低，傳輸時(shí)延小，適用于邊沿信息( sideinformation ， si )未知的情況，這兩種算法將ofdm技術(shù)和rayleigh信道下的sova譯碼算法有機(jī)的結(jié)合起來，很好地實(shí)現(xiàn)了頻率選擇信道下的sova譯碼。 - So far , there is not much research on the signal detection of da - mimo system , and the general frequency selective channel is not taken into consideration . in chapter 3 of this dissertation , the coherent signal detection algorithms for da - mimo system under both flat fading and frequency selective fading channels are derived . and the analysis of the factors which affect the performance of the detection algorithms is also illustrated through computer simulations
針對(duì)分布mimo信號(hào)檢測(cè)目前研究較少,并且沒有考慮一般意義下的頻率選擇性信道的情況,本文在第三章分別推導(dǎo)了基于平坦衰落和頻率選擇性衰落信道環(huán)境的分布mimo信號(hào)相干檢測(cè)算法,并通過計(jì)算機(jī)仿真,對(duì)影響算法檢測(cè)性能的因素進(jìn)行了分析討論。 - Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity . these applications include not only system performance improvement , but also reduction of the peak to average power ratio in mimo - ofdm systems . under these backgrounds , this paper first studies space - time block codes under the single carrier , flat fading situation , discusses the encoding / decoding principle and its performance under different channels . then , the author focused on the performance of space - time codes under time selective and frequency selective channels , uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation
在上述背景下,本文以單載波,平坦衰落信道下的空時(shí)分組碼為切入點(diǎn),深入分析了其編譯碼原理和在不同信道情況下的性能;以此為基礎(chǔ),后文展開了對(duì)空時(shí)分組碼在多載波,時(shí)間選擇性和頻率選擇性衰落信道下的性能研究,通過理論推導(dǎo)和充分的仿真,揭示了空時(shí)/頻分組碼在時(shí)頻選擇性衰落信道中的性能變化的根本原因;在以上對(duì)多載波系統(tǒng)中空時(shí)分組碼的研究的過程中,作者發(fā)現(xiàn)了空時(shí)分組碼在降低系統(tǒng)峰平比方面應(yīng)用的可行性,提出了一種降低峰平比的新方法。 - It's difficult to find selective channel in a sentence. 用selective channel造句挺難的
- Combined with the data - selected schemes proposed , the computational complexity of this method can be lowered . the performance of the presented rls method is analyzed by simulations , and it is shown that this method is interesting for application . 4 time - selective channel signal model based on multipath - doppler diversity representation is given in multi - path fast fading channel , and rls space - time receiver algorithm based on time - varied constraint condition is presented and the computational complexity of this method is analyzed
4 、針對(duì)多徑快衰落信道下的ds - cdma系統(tǒng)，給出了基于多徑-多譜勒觀點(diǎn)描述的1百安電弓卜科東兔j憶學(xué)協(xié)士學(xué)位論文時(shí)間選擇性信道的信號(hào)模型，提出了基于變約束條件下的遞歸最小二乘空時(shí)接收機(jī)算法并分析算法的運(yùn)算量，最后通過仿真分析了所提出的方法的性能。 - The following algorithms have been proposed and tested in the thesis : 1 frequency selective fading : combine the isomorphism between the input space and the output space and propose a new approach to blind equalization of the channel . compared with conventional methods , the new approach offers lower computational complexity , better performance , and more robust against the over - determination of the system order ; 2 time selective fading : a new approach to the equalization of time selective channel based on the zero - forced equalizer is proposed which is more simple in its structure of algorithm ; 3 time - varying channel : using the instantaneous mean value changes of the output signal to extract the information of channel variations and model it using ar model , kalman filter is then employed to track channel variations , it bears faster ability in tracking the variation of tv channels ; based on the isomorphism between the inputs and the outputs and some of the approaches using in mimo system , a new algorithm of equalization of simo time - varying channel is proposed , which also share the merits of being robust against the over - determination of the system order ; model the time - varying channel using the multi - resolution decomposition wavelets , and then a blind identification method based " on the model is proposed ; at last , a new model for equalization and identification of mimo system is proposed
主要工作在以下幾個(gè)方面： 1 、針對(duì)頻率選擇性衰落信道：結(jié)合輸入輸出空間同構(gòu)關(guān)系提出一種新的頻率選擇性信道均衡方法，與傳統(tǒng)方法相比，該方法計(jì)算量更小，收斂速度更快，性能更優(yōu)，且對(duì)系統(tǒng)階次的過確定表現(xiàn)穩(wěn)健，具有實(shí)際均衡應(yīng)用價(jià)值； 2 、針對(duì)時(shí)間選擇性衰落信道：提出一種基于迫零均衡的時(shí)間選擇性信道均衡方法，算法結(jié)構(gòu)簡(jiǎn)單； 3 、針對(duì)時(shí)變色散信道：利用瞬態(tài)均值曲線提取信道時(shí)變信息，對(duì)之a(chǎn)r建模，利用卡爾曼濾波器跟蹤時(shí)變信道抽頭變化，可以快速跟蹤信道變化；基于輸入輸出空間之間的同構(gòu)關(guān)系以及多輸入多輸出系統(tǒng)的處理方法，提出了新的單輸入多輸出色散時(shí)變信道均衡與識(shí)別算法，同樣具有對(duì)信道階次過確定保持穩(wěn)健的優(yōu)點(diǎn)；結(jié)合小波多分辨率分析提出一種基于小波模型的信道盲識(shí)別算法；研究時(shí)變的多輸入多輸出系統(tǒng)的盲均衡與盲反卷積問題，給出一種時(shí)變系統(tǒng)處理模型。