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selective channel中文什么意思
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- 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
針對分布mimo信號檢測目前研究較少,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信號相干檢測算法,并通過計(jì)算機(jī)仿真,對影響算法檢測性能的因素進(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。
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