Spectral efficiency

Continued part 1, part 2 of ebook "Practical chemoinformatics" provides readers with contents including: active site-directed pose prediction programs for efficient filtering of molecules; representation, fingerprinting, and modelling of chemical reactions; predictive methods for organic spectral data simulation; chemical text mining for lead discovery; ntegration of automated workflow in chemoinformatics for drug discovery;...

261p tudohanhtau1006 29-03-2024 6 1   Download

Acoustic feedback is a major problem in openfit digital hearing aids, which significantly lowers the signal quality and limits the achievable maximum stable gain. Adaptive feedback cancellation (AFC) is a common and efficient approach, however, it introduces a biased estimate of the feedback path due to a high correlation between loudspeaker signal and the incoming signal, especially when the incoming signal is spectrally coloured, e.g., speech, music.

11p viannee 02-08-2023 5 4   Download

In this paper, we develop a deep reinforcement learning-based routing, modulation format and spectrum assignment (RMSA) algorithm for elastic optical networks capable of provisioning dynamically lightpath services. In order to enhance the network performance, the developed RMSA exploits deep reinforcement learning (DRL) mechanism for selecting efficient route and spectral resource by learning experiences of dynamic lightpath provisioning.

6p viannee 02-08-2023 8 4   Download

Massive multiple-input multiple-output (m-MIMO) is used to improve the robustness of data transmission and high sum spectral efficiency in 5G systems. For 5G New Radio (NR) systems need to be designed to reduce cost and complexity, most notably hybrid analog-digital beamforming with large-scale antenna array which has become a major research target.

8p vimelindagates 18-07-2022 16 4   Download

The analytical and spectral data supported the binuclear formulation of the complexes with a 2:1 metal to ligand ratio and octahedral geometry. The molar conductance values of the UO2 (II)-complexes revealed their nonionic character. The ligands and their complexes were screened for their antibacterial activities towards the gram-positive Staphylococcus aureus and the gram-negative Escherichia coli, as well as their antifungal activities against Aspergillus niger and Candida albicans, in order to assess their antimicrobial potential.

14p langthannam 29-12-2021 12 1   Download

New derivatives of 2(3),9(10),16(17),23(24)-tetrakis-(6-methylpyridin-2-yloxy)phthalocyanine (Pc) (2b, 2c, and 2d) were synthesized and their structures were characterized by elemental analysis, IR, 1 H NMR, and high-resolution mass spectrometry. The spectral results were in line with the proposed structures. The photodegradation of Orange G (OG) dye in DMSO by the Pc derivatives was investigated. The compounds showed relatively high photodegradation rates that increased with increasing size of the central atoms.

11p tudichquannguyet 29-11-2021 17 1   Download

In recent years, optical orthogonal frequency division multiplexing (OOFDM) has emerged as a dominant research and development area in the field of high-speed optical communications. OFDM is a potential candidate as the most promising next-generation optical networks such as passive optical networks and optical transport networks, due to their simple configuration based on low cost, high speed data rates, high spectral efficiency, high quality of service and robustness against narrow band interference, frequency selective fading, and chromatic dispersion.

99p nguathienthan12 18-05-2021 17 6   Download

Owing biological significance of Quinoxaline and Pyrazole subsidiaries, we herein report the synthesis of title compounds.

6p cothumenhmong11 06-05-2021 10 1   Download

Inorganic or inorganic-organic hybrid nanomaterials have great potential for applications in the biomedical fields. Biological half-life is an essential pharmacokinetic parameter for these materials to function in vivo. Compared to inductively coupled plasma mass spectrometry (ICP-MS), which is the gold standard, laser-induced breakdown spectroscopy (LIBS) is a faster and more efficient elemental detection method. We investigated an efficient way to quantify the metabolic rate using LIBS.

9p covid19 14-06-2020 15 2   Download

Digital Video Broadcasting-Terrestrial (DVB-T) is the most widely deployed digital terrestrial television system worldwide with services on air in over thirty countries. In order to increase its spectral efficiency and to enable new services the DVB consortium has developed a new standard named DVB-T2. A nearly definitive specification has already been published as a BlueBook as well as an implementation guideline, where the structure and main technical novelties of the standard have been defined.

24p son248 24-03-2020 21 1   Download

Digital broadcast systems have increasingly been deployed for various services such as Digital Video Broadcasting (i.e. DVB-S, DVB-T, etc.) and Digital Audio Broadcasting (DAB). Classical digital broadcast systems were designed with fixed modulation guarantee reliable communication even with very hostile channel environment. DVB-T2 terrestrial television standard is becoming increasingly important. The emergence of it is motivated by the higher spectral efficiency and adopting transition from analogue TV to DVB-T2, or transition from DVB-T to DVB-T2.

7p son248 24-03-2020 27 1   Download

This paper introduces a principal concept of MIMO bit division and presents its performance with corresponding simulation results. When multiple antenna technique is applied to enhance the spectral efficiency, the original data stream should be divided in a proper way. We found that the way of dividing original data stream, if it is not cooperating well with the originally structured system, may lead to performance degradation. The key idea is dividing the original data bit stream without causing an undesired change of bit order at the output of bit-to-cell demux.

4p son248 24-03-2020 15 1   Download

The allocation of frequencies traditionally used by terrestrial broadcasting (digital dividend) to International Mobile Telecommunication (IMT) is limiting the evolution of the Digital Terrestrial Television (DTT) networks for enhanced service offering. Next-generation DTT standards are called to provide increased capacity within the reduced spectrum. Time Frequency Slicing (TFS) has been proposed as one of the key technologies for the future DTT networks.

15p son248 24-03-2020 23 1   Download

A field experiment on muskmelon crop was carried out at the instructional farm of department of Irrigation and Drainage Engineering, Dr. A.S.C.A.E.&T., Mahatma Phule Krishi Vidyapeeth, Rahuri, Maharashtra, during the period February- June, 2017, to study the response of shading nets and different irrigation regimes on yield of muskmelon (Cucumis melo L.). The experiment was laid in split factorial design with five main treatment (green white shade net with 35, 50&75 % shading, red shade net with 50 % shading and open field) and eight irrigation sub treatment.

10p nguaconbaynhay1 08-12-2019 18 0   Download

Formulae expressing explicitly the q-difference derivatives and the moments of the polynomials Pn(x ; q) ∈ T (T ={Pn(x ; q) ∈ Askey–Wilson polynomials: Al-Salam-Carlitz I, Discrete q-Hermite I, Little (Big) q-Laguerre, Little (Big) q-Jacobi, q-Hahn, Alternative q-Charlier) of any degree and for any order in terms of Pi(x ; q) themselves are proved. We will also provide two other interesting formulae to expand the coefficients of general-order q-difference derivatives Dp q f (x), and for the moments xDp q f (x), of an arbitrary function f(x) in terms of its original expansion coefficients.

15p kethamoi1 20-11-2019 14 0   Download

The photocatalytic decoloration of an organic dye, ethyl violet (EV), has been studied in the presence of TiO2 and the addition of b-Cyclodextrin (b-CD) with TiO2 (TiO2-b-CD) under UV-A light irradiation. The different operating parameters like initial concentration of dye, illumination time, pH and amount of catalyst used have also been investigated. The photocatalytic decoloration efficiency is more in the TiO2-b-CD/UV-A light system than TiO2/UV-A light system. The mineralization of EV has been confirmed by Chemical Oxygen Demand (COD) measurements.

7p kethamoi1 17-11-2019 16 1   Download

An efficiently simple protocol for the synthesis of methyl 7 amino-4-oxo-5-phenyl-2-thioxo-2, 3, 4,5-tetrahydro-1H-pyrano[2,3-d]pyrimidine-6-carboxylates via one-pot three component condensation pathway is established via microwave irradiation using varied benzaldehyde derivatives, methylcyanoacetate and thio-barbituric acid in water as a green solvent.

8p trinhthamhodang1 16-11-2019 39 0   Download

In this paper, a new Space-Time Block Coded Spatial Modulation (SM) scheme based on the Golden Code, called the Golden Coded Spatial Modulation (GC-SM), is proposed and analyzed. This scheme still keeps some main benefits of the Golden Code by satisfying the non-vanishing Space Time Block Code (STBC) criteria. In the signal constellation domain, the GC-SM spectral efficiency is twice that of the STBC-SM.

8p vimariecurie2711 30-07-2019 22 0   Download

This paper is aimed to provide a comprehensive review on the spectrally efficient transmission techniques applied in multiple antenna systems. Specifically, three state-of-the-art techniques which make use of the spatial domain to convey information bits, including the Vertical Bell-Labs Layered Space-Time (V-BLAST), the source-based spatial modulation (SM) and the media-based modulation (MBM), will be surveyed and their critical advantages as well as limitations will be highlighted.

10p viengland2711 23-07-2019 19 0   Download

This research was conducted FHMA (Frequency Hopping Multiple Access) standard using Labview. FHMA was developed in Israel in the spectral efficiency. The main objective of this research is to emphasize the performance of the communication system of FHMA paper. FHMA have good radio features that provide full radio capacity, covering the trunking and untargeted mobile phone, with a choice of services including packet mode, short message services and voice.

8p byphasse043256 21-03-2019 27 4   Download