Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.0K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
1.0K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.1K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.1K
Leaky Scanning02:28

Leaky Scanning

5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

723
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
723
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

957
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
957
IR Spectrum01:19

IR Spectrum

1.1K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
1.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Cross-Domain OTFS Detection via Delay-Doppler Decoupling: Reduced-Complexity Design and Performance Analysis.

Entropy (Basel, Switzerland)·2025
Same author

Bit-Level Construction for Multiplicative-Repetition-Based Non-Binary Polar Codes.

Entropy (Basel, Switzerland)·2025
Same author

Matroidal Entropy Functions: A Quartet of Theories of Information, Matroid, Design, and Coding.

Entropy (Basel, Switzerland)·2021
Same author

Ibandronate to treat skeletal-related events and bone pain in metastatic bone disease or multiple myeloma: a meta-analysis of randomised clinical trials.

BMJ open·2015
Same author

Association of mtDNA M/N haplogroups with systemic lupus erythematosus: a case-control study of Han Chinese women.

Scientific reports·2015
Same author

Defective roles of ATP7B missense mutations in cellular copper tolerance and copper excretion.

Molecular and cellular neurosciences·2015

相关实验视频

Updated: Jul 25, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

6.3K

在异步SCMA系统中使用IR-HARQ进行窗口式联合检测和解码.

Mengsheng Guan1, Min Zhu1,2, Baoming Bai1

  • 1The State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China.

Entropy (Basel, Switzerland)
|June 28, 2023
PubMed
概括

本研究介绍了一种新的窗口式联合检测和解码算法,以增强非同步的Sparse Code Multiple Access (SCMA) 系统. 拟议的方法可以提高解码性能和系统吞吐量,而不是添加式白高斯噪声 (AWGN) 频道.

关键词:
在IR-HARQQ中,在RC-LDPC中使用RC-LDPC这就是SCMAMA.有窗口的联合检测和解码.

更多相关视频

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

9.9K
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.5K

相关实验视频

Last Updated: Jul 25, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

6.3K
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

9.9K
Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

8.5K

科学领域:

  • 无线通信系统无线通信系统
  • 信息理论是信息理论.
  • 信号处理 信号处理

背景情况:

  • 异步散码多重接入 (SCMA) 系统在对添加式白高斯噪声 (AWGN) 频道的解码性能方面面临挑战.
  • 现有的混合自动重复任务 (HARQ) 方案与联合检测和解码需要提高效率.

研究的目的:

  • 为SCMA系统中基于LDPC代码的增量冗余 (IR) HARQ方案提出一种新的窗口式联合检测和解码算法.
  • 提高异步SCMA系统的解码性能和整体吞吐量.

主要方法:

  • 开发一个窗口式联合检测和解码算法,以促进解码器和以前的检测器之间的代信息交换.
  • 这个算法在一个相容的,基于LDPC代码的,增量冗余的HARQ方案中实现.
  • 通过AWGN通道上的异步SCMA系统的模拟进行性能评估.

主要成果:

  • 拟议的滑窗IR-HARQ方案在SCMA系统中明显优于原来的IR-HARQ方案.
  • 与现有方法相比,窗口式联合检测和解码算法展示了优越的解码性能.
  • 通过拟议的IR-HARQ方案,SCMA系统的整体吞吐量得到了改善.

结论:

  • 新的窗口联合检测和解码算法有效地提高了异步SCMA系统的性能.
  • 拟议的IR-HARQ方案为提高无线通信的解码效率和系统吞吐量提供了一个有希望的解决方案.