Results 21 to 30 of about 5,999,057 (304)

Performance Analysis and Comparison of Time-Hopping and Direct-Sequence UWB-MIMO Systems

EURASIP Journal on Advances in Signal Processing, 2005
We analyze the performance of ultra-wideband (UWB) multiple-input multiple-output (MIMO) systems employing various modulation and multiple access (MA) schemes including time-hopping (TH) binary pulse-position modulation (BPPM), TH binary phase-shift ...
Siriwongpairat W Pam, Olfat Masoud, Liu KJ Ray   +2 more
doaj   +1 more source

Quantum Direct-Sequence Spread-Spectrum CDMA Communication Systems: Mathematical Foundations

IEEE Transactions on Quantum Engineering
This article describes the fundamental principles and mathematical foundations of quantum direct-sequence spread-spectrum code division multiple-access communication systems.
Mohammad Amir Dastgheib, Jawad A. Salehi, Mohammad Rezai   +2 more
doaj   +1 more source

Direct determination of diploid genome sequences [PDF]

Genome Research, 2016
Determining the genome sequence of an organism is challenging, yet fundamental to understanding its biology. Over the past decade, thousands of human genomes have been sequenced, contributing deeply to biomedical research. In the vast majority of cases, these have been analyzed by aligning sequence reads to a single reference genome, biasing the ...
Weisenfeld, Neil I., Kumar, Vijay, Shah, Preyas, Church, Deanna M., Jaffe, David B.   +4 more
openaire   +2 more sources

CrisprVi: a software for visualizing and analyzing CRISPR sequences of prokaryotes

BMC Bioinformatics, 2022
Background Clustered regularly interspaced short palindromic repeats (CRISPR) and their spacers are important components of prokaryotic CRISPR-Cas systems.
Lei Sun, Jinbiao Wang, Fu Yan, Gongming Wang, Yun Li, Jinlin Huang   +5 more
doaj   +1 more source

Direct-Sequence-CDMA in Highly Sensitive Indirect Time-of-Flight Distance Sensor

IEEE Photonics Journal, 2023
This work presents the application of Direct-Sequence Code-Division-Multiple-Access (DS-CDMA) to tackle the primary problem of simultaneous multi-access of a shared light channel in an indirect Time-of-Flight measurement system based on on-off-keyed (OOK)
Fabio Schartmuller, Michael Hauser, Alexander Kuttner, Horst Zimmermann, Michael Hofbauer   +4 more
doaj   +1 more source

DIRECT: RNA contact predictions by integrating structural patterns

BMC Bioinformatics, 2019
Background It is widely believed that tertiary nucleotide-nucleotide interactions are essential in determining RNA structure and function. Currently, direct coupling analysis (DCA) infers nucleotide contacts in a sequence from its homologous sequence ...
Yiren Jian, Xiaonan Wang, Jaidi Qiu, Huiwen Wang, Zhichao Liu, Yunjie Zhao, Chen Zeng   +6 more
doaj   +1 more source

Model Predictive Direct Power Control for Virtual-Flux-Based VSR With Optimal Switching Sequence

IEEE Access, 2022
Three-phase voltage-source rectifier (VSR) has been widely used in energy, industry and other fields in the past few years. Model predictive control with optimal switching sequence (OSS-MPC) has further reduced output current THD and ripples with a ...
Han Shi, Xiang Rong, Ping Tuo, Yuxuan Yao, Zheng Gong   +4 more
doaj   +1 more source

Gradients of Sequences of Subgroups in a Direct Product [PDF]

International Mathematics Research Notices, 2017
For a sequence $\{U_n\}_{n = 1}^\infty$ of finite index subgroups of a direct product $G = A \times B$ of finitely generated groups, we show that $$\lim_{n \to \infty} \frac{\min\{|X| : \langle X \rangle = U_n\}}{[G : U_n]} = 0$$ once $[A : A \cap U_n], [B : B \cap U_n] \to \infty$ as $n \to \infty$.
Nikolov, N, Shemtov, Z, Shusterman, M
openaire   +3 more sources

Direct sequence spread spectrum: history, principles and modern applications

Vojnotehnički Glasnik
Introduction/purpose: Direct sequence spread spectrum modulation is widely used in many radiocommunications systems. At the first time, this modulation technique was used in military communications and navigation systems.
Nenad M. Stojanović, Branislav M. Todorović, Vladimir B. Ristić, Ivana V. Stojanović   +3 more
doaj   +1 more source

A sequence that directs transcriptional initiation in yeast [PDF]

Current Genetics, 1990
While RNA polymerase II of the yeast Saccharomyces cerevisiae initiates transcription at discrete sites, these sites are located over a wide range of distances from the TATA box for different genes. This variability has led to a number of proposals for consensus sequences located at the initiation site which, in conjunction with the TATA box, would ...
Healy, A. M., Zitomer, R. S.
openaire   +3 more sources