selective channel meaning in English
选择通道
选择性通路
Examples
- 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
它结合了ofdm和cdma技术的优点，能够把宽带频率选择性衰落转化为每子载波的平坦信道。 - The protoplasts of arabidopsis were isolated and the voltage - dependent k + - selective channels in the plasma membrane were recorded by whole - cell configuration
O 。的产生部位。我们分离了拟南芥保卫细胞原生质体并记录在不同处理条件下全细胞内向k ”电流的变化情况。 - 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
另一种是不含信道估计的差分sova算法(简称dsova ) ，该算法不必知道csi ，计算复杂度低，传输时延小，适用于边沿信息( sideinformation ， si )未知的情况，这两种算法将ofdm技术和rayleigh信道下的sova译码算法有机的结合起来，很好地实现了频率选择信道下的sova译码。 - 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
针对分布mimo信号检测目前研究较少,并且没有考虑一般意义下的频率选择性信道的情况,本文在第三章分别推导了基于平坦衰落和频率选择性衰落信道环境的分布mimo信号相干检测算法,并通过计算机仿真,对影响算法检测性能的因素进行了分析讨论。 - 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,本文以单载波,平坦衰落信道下的空时分组码为切入点,深入分析了其编译码原理和在不同信道情况下的性能;以此为基础,后文展开了对空时分组码在多载波,时间选择性和频率选择性衰落信道下的性能研究,通过理论推导和充分的仿真,揭示了空时/频分组码在时频选择性衰落信道中的性能变化的根本原因;在以上对多载波系统中空时分组码的研究的过程中,作者发现了空时分组码在降低系统峰平比方面应用的可行性,提出了一种降低峰平比的新方法。