查询词典 channel

Recent progress in radio prototype has extended the horizons of radio technology by liberating chronics dependence on hard-wired characteristics including frequency band, channel bandwidth, and channel coding. These efforts have led us to the feasibility of dynamically programmable receivers system of software radio.

软件无线电系统的硬件结构与功能相对独立，这样就可以基于相对通用的硬件平台，通过软件实现不同的通信功能，并可对工作频率、系统频带、调制方式等进行编程控制，系统的灵活性大大增加。

Between 4-9L exposures, C2H4 has a desorption channel at 155-180K. C2H4 desorption at 130K maybe results from BrCH2CH2Br absorbs in Br atom toward surfaces, after C-Br bond scission, because C2H4 has no opportunity to touch surfaces so it desorbs at low temperature. C2H4 desorption at 210K is likely to be desorption limited that, BrCH2CH2Br docomposes to C2H4, only to desorb at higher temperature. This C2H4 desorption channel maybe comes from defect site desorption.

曝露量在4-9L之间，C2H4在155至180K的范围内也有脱附的管道。130K的C2H4脱附可能是因为BrCH2CH2Br分子以Br原子朝向表面的方式吸附，在断了C-Br键后，C2H4分子没有机会接触到表面在低温就脱附了。210K的C2H4可能是脱附所决定的，亦即BrCH2CH2Br分解后在表面形成C2H4，随后温度升高至较高温才从表面脱附，此C2H4管道也许是来自缺陷位置上的脱附。

Salty and sour directly transduction by apical channels that are non-gated channel or chemically-gated channel. Bitter compounds in saliva activate particular T2R/TRB isoforms which activate gustducin heterotimers, activated α-gustducin stimulates PDE to hydrolyze cAMP, the decreased cAMP may disinhibit cyclic nucleotide-inhibited channels to elevate intracellular Ca2+.

咸和酸直接通过顶部非门控或化学门控离子通道转导唾液中的苦味化合物激活T2R/TRB同型体，激活导致味导素异聚体的激活，被激活的α-味导素又激活PDE，PDE水解cAMP，cAMP水平的降低使环核苷酸抑制的阳离子通道去抑制，从而使细胞内Ca2+升高。

Finally we combine turbo code with OFDM technology ,then make some emulations under several kinds of channel fading types in the mobile communication ,it has offered new choice for turbo code applying in fading channel.

所以最后我们将Turbo码与OFDM技术相结合，针对移动通信信道的各种不同的衰落类型进行仿真分析，为Turbo码在衰落信道中的应用提供了新的选择。

Determination of reverse link performance may be done in variety of ways, including use of a filter percentage of ACK erasures, measured error rates on the reverse link control channel, reverse link data channel error rates, and other methods.

反向链路性能的确定可以通过各种方式进行，包括利用过滤后的ACK删除百分比，反向链路控制信道上的被测差错率，反向链路数据信道差错率，以及其它方法。

So, channel fadings can be exploited. But the multi-user diversity gains are limited in two ways. First, there may be a line-of-sight path and little scattering in the environment, and hence the dynamic range of channel fluctuations is too small.

因此，信道衰落是可以利用的，但这种多用户分集受到两方面因素的制约：一是在LOS和非散射信道环境，信道变化范围太小；二是如果信道衰落变化太慢，则不能满足对时延要求严格的应用。

Information Theory has shown that if the channel fadings of multiple users are independent and scheduling the transmissions to the users when their instantaneous channel quality is near the peak, the total throughput of system can be maximized and it is direct ratio to the number of users.

信息论分析结果表明，如果多用户的信道衰落相互独立，任一时隙只服务于信道最好的用户，则系统的总吞吐量可以最大化，而且与用户数成正比，对于不同的用户数，衰落信道的容量几乎都能高于AWGN信道。

In wireless broadband digital communication, Inter-Symbol Interference caused by time disperse of radio channel is one of main factors that limit bandwidth of communicated information and system performance of communication. In receiver, Orthogonal Frequency Division Multiplexing system can easily cancel ISI and equalize frequency-selective fadings that are both caused by time disperse of radio channel.

在这一系统中，无线信道时延扩展引起的符号间干扰是限制传输性能和信息速率的主要因素之一；而在消除符号间干扰和均衡由无线信道时延扩展引起的频率选择性衰落方面，正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术具有明显优势。

To demodulate the OFDM signals accurately, channel estimation algorithms are adopted. This paper examines the slow-fading estimation algorithms based on block pilot arrangement: LS and LMMSE algorithms, as well as the fast-fading channel estimation algorithms based on comb-type pilot arrangement: linear and transform domain interpolation algorithms.

本文分析了导频分布的两种方案：1块状导频分布，对基于块状导频分布方案的慢衰落信道估计算法：最小平方和线性最小均方误差算法进行了计算机仿真，比较了二者的估计性能，以及各自的优缺点；2梳状导频分布，对基于这种分布方案的快衰落信道估计算法进行了研究，对两类经典算法：线性插值法和基于变换域的插值法分别进行了理论分析和计算机仿真。

The flumes hall has a sediment characteristic analysis room and seven advanced glass flumes with automatic controlling and measuring systems, where researches can be conducted on flow structure in curved channel, movement of suspend load, movement of bed load, movement of hyper concentrated sediment flow, movement rules of sediment caused by wave and current flow together, or by the wind, channel pattern transformation and the settling characteristics of sediment etc.

水槽实验大厅拥有本学科内国内外自动化程度最高、测控技术最先进、规模最大的浑水变坡玻璃实验系列水槽共七座以及泥沙基本特性分析室，可以进行弯道水流结构、悬移质泥沙运动、推移质泥沙运动、高含沙水流运动、波流、径流共同作用下泥沙运动规律、河型转化、风作用下泥沙运动规律的研究、泥沙的沉降特性等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。